TEXAS INSTRUMENTS bq24072, bq24073, bq24074, bq24075 Technical data

IN

VSS

BAT

DC+

GND

Adaptor

bq24074

CE

OUT

CHG

PGOOD

TMR

EN1

EN2

TS

ITERM

ILIM

ISET

TEMP

PACK+

PACK-

SYSTEM

bq24072 , bq24073 bq24074 , bq24075

www.ti.com

......................................................................................................................................................................................... SLUS810 – SEPTEMBER 2008

1.2A USB-FRIENDLY Li-Ion BATTERY CHARGER AND POWER-PATH MANAGEMENT IC

1

FEATURES

• 28V Input Rating • Soft-Start Feature to Reduce Inrush Current

• Integrated Dynamic Power Management • Status Indication – Charging/Done, Power

Feature Good

• Supports up to 1.5A Output Current • Small 3 mm × 3 mm 16 Lead QFN Package

• Integrated USB Charge Control With

Selectable 100 mA and 500 mA Maximum Input Current

• Programmable Pre-Charge and Fast-Charge

Safety Timers

• Thermal Regulation for Charge Control

• Reverse Current, Short-Circuit and Thermal

Protection

DESCRIPTION

The bq2407x series of devices are highly integrated Li-ion linear chargers and system power path management devices targeted at space-limited portable applications. The devices operate from either a USB port or AC adapter. The high input voltage range with input overvoltage protection supports low-cost unregulated adapters.

The bq2407x powers the system while simultaneously and independently charging the battery. This feature reduces the number of charge and discharge cycles on the battery, allows for proper charge termination and enables the system to run with a defective or absent battery pack. Additionally, this enables instant system turn-on even with a totally discharged battery. The power-path management architecture also permits the battery to supplement the system current requirements when the adapter cannot deliver the peak system currents, enabling the use of a smaller adapter.

The battery is charged in three phases: conditioning, constant current, and constant voltage. In all charge phases, an internal control loop monitors the IC junction temperature and reduces the charge current if the internal temperature threshold is exceeded.

• NTC Thermistor Input

APPLICATIONS

• Smart Phones

• PDAs

• MP3 Players

• Low-Power Handheld Devices

TYPICAL APPLICATION CIRCUIT

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.

bq24072 , bq24073 bq24074 , bq24075

SLUS810 – SEPTEMBER 2008 .........................................................................................................................................................................................

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.

DESCRIPTION (CONTINUED)

The charger power stage and charge current sense functions are fully integrated. The charger function has high accuracy current and voltage regulation loops, charge status display, and charge termination. The input current limit and charge current are programmable using external resistors.

ORDERING INFORMATION

PART NUMBER V

(1) (2)

OVP

bq24072RGTR 6.6 V V bq24072RGTT 6.6 V V bq24073RGTR 6.6 V 4.4 V V bq24073RGTT 6.6 V 4.4 V V bq24074RGTR 10.5 V 4.4 V V bq24074RGTT 10.5 V 4.4 V V bq24075RGTR 6.6 V 5.5 V 4.3 V SYSOFF CDU bq24075RGTT 6.6 V 5.5 V 4.3 V SYSOFF CDU

(1) The RGT package is available in the following options:

R - taped and reeled in quantities of 3,000 devices per reel. T - taped and reeled in quantities of 250 devices per reel.

(2) This product is RoHS compatible, including a lead concentration that does not exceed 0.1% of total product weight, and is suitable for

use in specified lead-free soldering processes. In addition, this product uses package materials that do not contain halogens, including bromine (Br) or antimony (Sb) above 0.1% of total product weight.

V

OUT(REG)

+ 200 mV V

BAT

+ 200 mV V

BAT

V

DPM

– 100 mV TD CKP

O(REG)

– 100 mV TD CKP

O(REG)

– 100 mV TD CKQ

O(REG)

– 100 mV TD CKQ

O(REG)

– 100 mV ITERM BZF

O(REG)

– 100 mV ITERM BZF

O(REG)

OPTIONAL MARKING FUNCTION

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ABSOLUTE MAXIMUM RATINGS

(1)

over operating free-air temperature range (unless otherwise noted)

VALUE UNIT

IN (with respect to VSS) – 0.3 to 28 V

V

I

Input Voltage

I

Input Current IN 1.6 A

I

Output Current (Continuous)

O

Output Sink Current CHG, PGOOD 15 mA T T

Junction temperature – 40 to 150 ° C

J

Storage temperature – 65 to 150 ° C

stg

(1) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings

only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. All voltage values are with respect to the network ground terminal unless otherwise noted.

DISSIPATION RATINGS

PACKAGE

(2)

(1)

RGT

(1)

R

39.47 ° C/W 2.4 ° C/W 2.3 W 34.6 mW/ ° C

(1) This data is based on using the JEDEC High-K board and the exposed die pad is connected to a Cu pad on the board. The pad is

connected to the ground plane by a 2x3 via matrix.

(2) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI

website at www.ti.com .

BAT (with respect to VSS) – 0.3 to 5 V OUT, EN1, EN2, CE, TS, ISET, PGOOD, CHG, ILIM, TMR,

ITERM, SYSOFF, TD (with respect to VSS)

– 0.3 to 7 V

OUT 5 A BAT (Discharge mode) 5 A

θ JA

R

θ JC

TA≤ 25 ° C DERATING FACTOR

POWER RATING TA> 25 ° C

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075

bq24072 , bq24073 bq24074 , bq24075

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RECOMMENDED OPERATING CONDITIONS

V

I

IN

I

OUT

I

BAT

I

CHG

T

J

R

ILIM

R

ISET

R

ITERM

R

TMR

ELECTRICAL CHARACTERISTICS

Over junction temperature range (0 ° ≤ TJ≤ 125 ° C) and the recommended supply voltage range (unless otherwise noted)

INPUT

UVLO Undervoltage lock-out VIN: 0 V → 4 V 3.2 3.3 3.4 V V

hys

V

IN(DT)

V

hys

t

DGL(PGOOD)

V

OVP

V

hys

t

BLK

t

REC

ILIM, TEST ISET SHORT CIRCUIT

I

SC

V

SC

QUIESCENT CURRENT

I

BAT(PDWN)

I

IN

I

CC

POWER PATH

V

DO(IN-OUT)

V

DO(BAT-OUT)

V

O(REG)

......................................................................................................................................................................................... SLUS810 – SEPTEMBER 2008

MIN MAX UNIT

IN voltage range 4.35 26 V

IN operating voltage range V

’ 72, ’ 73, ‘ 75 4.35 6.6

‘ 74 4.35 10.5 Input current, IN pin 1.5 A Current, OUT pin 4.5 A Current, BAT pin (Discharging) 4.5 A Current, BAT pin (Charging) 1.2 A Junction Temperature – 40 125 ° C Maximum input current programming resistor 1100 8000 Ω Fast-charge current programming resistor 750 3000 Ω Termination current programming resistor 0 15 k Ω Timer programming resistor 18 72 k Ω

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

Hysteresis on UVLO VIN: 4 V → 0 V 200 300 mV Input power detection threshold 55 80 130 mV Hysteresis on V

IN(DT)

Deglitch time, input power detected status

Input overvoltage protection threshold V

Input power detected when VIN> V V

= 3.6 V, VIN: 3.5 V → 4 V

BAT

V

= 3.6 V, VIN: 4 V → 3.5 V 20 mV

BAT

Time measured from VIN: 0 V → 5 V 1 µ s rise-time to PGOOD = LO

( ’ 72, ’ 73, ’ 75) VIN: 5 V → 7 V 6.4 6.6 6.8 ( ’ 74) VIN: 5 V → 11 V 10.2 10.5 10.8

Hysteresis on OVP ( ’ 72, ’ 73, ’ 75) VIN: 7 V → 5V 110 mV

( ’ 74) VIN: 11 V → 5 V 175

Input overvoltage blanking time 50 µ s Input overvoltage recovery time 2 ms

Time measured from VIN: 11 V → 5 V with 1 µ s fall-time to PGOOD = LO

Current source 1.3 mA

CE = LO or HI, input power not detected, No

Sleep current into BAT pin load on OUT pin, 6.5 µ A

TJ= 85 ° C

Standby current into IN pin

Active supply current, IN pin 1.5 mA

VIN– V

OUT

V

– V

BAT

OUT

OUT pin voltage regulation (bq24072)

OUT pin voltage regulation (bq24073, VIN> V bq24074)

OUT pin voltage regulation (bq24075) VIN> V

EN1= HI, EN2=HI, VIN= 6 V, TJ=85 ° C 50 µ A EN1= HI, EN2=HI, VIN= 10 V, TJ=85 ° C 200 CE = LO, VIN= 6 V, no load on OUT pin,

V

> V

BAT

VIN= 4.3 V, IIN= 1A, V I

= 1 A, VIN= 0 V, V

OUT

VIN> V VIN> V

BAT(REG)

+ V

OUT

+ V

OUT

+ V

OUT

+ V

OUT

, (EN1, EN2) ≠ (HI, HI)

= 4.2V 300 475 mV

BAT

> 3 V 50 100 mV

BAT

, V

DO(IN-OUT)

BAT

, V

BAT

+ V

BAT

IN(DT)

< 3.2 V 3.4 ≥ 3.2 V

4.3 4.4 4.5

5.4 5.5 5.6

4 ms

520 mV

V

+

BAT

225mV

V

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075

bq24072 , bq24073 bq24074 , bq24075

SLUS810 – SEPTEMBER 2008 .........................................................................................................................................................................................

ELECTRICAL CHARACTERISTICS (continued)

Over junction temperature range (0 ° ≤ TJ≤ 125 ° C) and the recommended supply voltage range (unless otherwise noted)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

EN1 = LO, EN2 = LO 90 95 100

IINmax Maximum input current EN1 = HI, EN2 = LO 450 475 500

EN2 = HI, EN1 = LO K

K

ILIM

IINmax EN2 = HI, EN1 = LO, R

V

IN(LOW)

Maximum input current factor I

Programmable input current limit range

Input voltage threshold when input current is reduced

≥ 500mA 1480 1550 1620 A Ω

LIM

200mA < I

< 500mA 1320 1470 1620

LIM

EN2 = LO, EN1 = X 4.35 4.5 4.63 V

Output voltage threshold when ( ’ 72, ’ 73, ’ 74) V

V

DPM

charging current is reduced 100mV

( ’ 75) 4.3 V

V

BSUP1

V

BSUP2

V

O(SC1)

Enter battery supplement mode mV

Exit battery supplement mode mV Output short-circuit detection

threshold, power-on Output short-circuit detection

V

O(SC2)

t

DGL(SC2)

t

REC(SC2)

threshold, supplement mode V V

> V

OUT

indicates short-circuit

O(SC2)

Deglitch time, supplement mode short circuit

Recovery time, supplement mode short circuit

– 200 250 300 mV

BAT

BATTERY CHARGER

I

BAT

V

BAT

V

BAT(REG)

V

LOWV

t

DGL1(LOWV)

t

DGL2(LOWV)

I

CHG

Source current for BAT pin short-circuit detection

BAT pin short-circuit detection threshold

Battery charge voltage 4.16 4.20 4.24 V Pre-charge to fast-charge transition

threshold Deglitch time on pre-charge to

fast-charge transition Deglitch time on fast-charge to

pre-charge transition Battery fast charge current range 300 1200 mA

V EN1 = LO, EN2 = HI

> V

BAT(REG)

> V

BAT

CE = LO, EN1= LO, EN2 = HI, V

> V

Battery fast charge current K

BAT

on OUT pin, thermal loop and DPM loop not

, VIN= 5 V, IINmax > I

LOWV

active

K

ISET

I

PRECHG

K

PRECHG

Fast charge current factor 797 890 975 A Ω Pre-charge current K Pre-charge current factor 70 88 106 A Ω

CE = LO, (EN1, EN2) ≠ (LO, LO), A V

> V

BAT

I

TERM

I

BIAS(ITERM)

I

TERM

Termination comparator detection threshold (internally set)

Current for external termination-setting resistor

Termination current threshold A (externally set) (bq24074)

and thermal loop not active CE = LO, (EN1, EN2) = (LO, LO),

V

BAT

and thermal loop not active

, t < t

RCH

MAXCH

> V

, t < t

RCH

MAXCH

= 8 k Ω to 1.1 k Ω 200 1500 mA

ILIM

0.8 0.9 1 V

4 7.5 11 mA

1.6 1.8 2.0 V

2.9 3 3.1 V

, VIN= 5 V CE = LO,

LOWV

, no load

CHG

, VIN= 5 V, DPM loop

0.09 × I

0.027 × I

CHG

72 75 78 µ A

K

ITERM

/R

ILIM

O(REG)

V

≤ V

OUT

BAT

– 40

V

OUT

V

– 20

BAT

250 µ s

60 ms

25 ms

/R

ISET

/R

PRECHG

ISET

0.1 × I

CHG

0.033 × I

CHG

× R

/ R

ITERM

–

≥

ISET

0.11 × I

0.040 × I

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mA

A

V

A

CHG

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075

bq24072 , bq24073 bq24074 , bq24075

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ELECTRICAL CHARACTERISTICS (continued)

Over junction temperature range (0 ° ≤ TJ≤ 125 ° C) and the recommended supply voltage range (unless otherwise noted)

K

ITERM

t

DGL(TERM)

V

RCH

t

DGL(RCH)

t

DGL(NO-IN)

I

BAT(DET)

t

DET

BATTERY CHARGING TIMERS

t

PRECHG

t

MAXCHG

t

PRECHG

t

MAXCHG

K

TMR

BATTERY-PACK NTC MONITOR

I

NTC

V

HOT

V

HYS(HOT)

V

COLD

V

HYS(COLD)

t

DGL(TS)

V

DIS(TS)

THERMAL REGULATION

T

J(REG)

T

J(OFF)

T

J(OFF-HYS)

LOGIC LEVELS ON EN1, EN2, CE, SYSOFF, TD

V

IL

V

IH

I

IL

I

IH

LOGIC LEVELS ON PGOOD, CHG

V

OL

(1) These numbers set trip points of 0 ° C and 50 ° C while charging, with 3 ° C hysteresis on the trip points, with a Vishay Type 2 curve NTC

......................................................................................................................................................................................... SLUS810 – SEPTEMBER 2008

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

CE = LO, (EN1, EN2) ≠ (LO, LO), A

0.008 0.0100 0.012

0.0225 0.0300 0.0375

K Factor for termination detection threshold (externally set) (bq24074)

V

> V

BAT

and thermal loop not active

, t < t

RCH

MAXCH

CE = LO, (EN1, EN2) = (LO, LO), V

> V

BAT

and thermal loop not active

, t < t

RCH

MAXCH

, VIN= 5 V, DPM loop

Deglitch time, termination detected 0 25 ms

V

Recharge detection threshold mV

BAT(REG)

– 140 – 100 – 60

V

BAT(REG)

Deglitch time, recharge threshold detected

V

Delay time, input power loss to charger turn-off

= 3.6 V. Time measured from

BAT

VIN: 5 V → 3 V 1 µ s fall-time Sink current for battery detection 5 7.5 10 mA Battery detection timer 250 ms

Pre-charge safety timer value TMR = floating 1440 1800 2160 s Charge safety timer value TMR = floating 14400 18000 21600 s Pre-charge safety timer value 18 k Ω < R Charge safety timer value 18 k Ω < R

< 72 k Ω R

TMR

< 72 k Ω 10 × RTMR × K

TMR

× K

TMR

Timer factor 36 48 60 s/k Ω

(1)

NTC bias current 72 75 78 µ A High temperature trip point Battery charging 270 300 330 mV Hysteresis on high trip point Battery charging 30 mV Low temperature trip point Battery charging 2000 2100 2200 mV Hysteresis on low trip point Battery charging 300 mV Deglitch time, pack temperature fault

detection TS function disable threshold

(bq24072, bq24073)

Battery charging 50 ms

VIN- 200mV V

Temperature regulation limit 125 ° C Thermal shutdown temperature 155 ° C Thermal shutdown hysteresis 20 ° C

Logic LOW input voltage 0 0.4 V Logic HIGH input voltage 1.4 6 V

VIL= 0V 1 µ A

VIH= 1.4V 10 µ A

Output LOW voltage I

= 5 mA 0.4 V

SINK

with an R25 of 10 k Ω .

V

BAT(REG)

62.5 ms

20 ms

TMR

s s

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075

1

2

3

4

12

11

10

9

ILIM OUT OUT CHG

TS BAT BAT

CE

ISET

TD

PGOOD

VSS

TMR

IN

EN2

EN1

16 15 14 13

5 6 7 8

bq24075

1

2

3

4

12

11

10

9

ILIM OUT OUT CHG

TS BAT BAT

CE

ISET

ITERM

PGOOD

VSS

TMR

IN

EN2

EN1

16 15 14 13

5 6 7 8

bq24074

SYSOFF

1

2

3

4

12

11

10

9

ILIM OUT OUT CHG

TS BAT BAT

CE

ISET

PGOOD

VSS

TMR

IN

EN2

EN1

16 15 14 13

5 6 7 8

bq24072 bq24073

bq24072 , bq24073 bq24074 , bq24075

SLUS810 – SEPTEMBER 2008 .........................................................................................................................................................................................

RGT PACKAGE

(Top View)

TERMINAL FUNCTIONS

TERMINAL

NAME

TS 1 1 1 I a 10k Ω NTC thermistor.To disable the external temperature sense circuitry, connect a 10k Ω resistor from TS

BAT 2, 3 2, 3 2, 3 I/O

CE 4 4 4 I mode. In standby mode, OUT is active. Connect CE to a low logic level to enable the battery charger. CE is

EN2 5 5 5 I Input Current Limit Configuration Inputs. Use EN1 and EN2 control the maximum input current and enable EN1 6 6 6 I

PGOOD 7 7 7 O detected. PGOOD is high-impedance when the input power is not within specified limits. Connect PGOOD to

VSS 8 8 8 – Ground. Connect to the thermal pad and to the ground rail of the circuit. CHG 9 9 9 O

OUT 10, 11 10, 11 10, 11 O above the regulation voltage. Connect OUT to the system load. Bypass OUT to VSS with a 4.7 µ F to 47 µ F

ILIM 12 12 12 I the maximum input current (EN2=1, EN1=0). The input current includes the system load and the battery

IN 13 13 13 I

TMR 14 14 14 I to disable all timers. Connect a 18 k Ω to 72 k Ω resistor between TMR and VSS to program the timers a

TD 15 – – I charger termination. See the TD section in this datasheet for a description of the behavior when termination is

ITERM – 15 – I

SYSOFF – – 15 I

ISET 16 16 16 I/O

Thermal The thermal pad must be connected to the same potential as the VSS pin on the printed circuit board. Do not Pad use the thermal pad as the primary ground input for the device. VSS pin must be connected to ground at all

' 72, ' 73 ' 74 ' 75

NO. I/O DESCRIPTION

External NTC Thermistor Input. Connect the TS input to the NTC thermistor in the battery pack. TS moniitors to VSS.

Charger Power Stage Output and Battery Voltage Sense Input. Connect BAT to the positive terminal of the battery. Bypass BAT to VSS with a 4.7 µ F to 47 µ F ceramic capacitor.

Charge Enable Active-Low Input. Connect CE to a high logic level to place the battery charger in standby internally pulled down with ~285 k Ω .

USB compliance. See Table 2 for the description of the operation states. EN1 and EN2 are internally pulled down with ~285 k Ω .

Open-drain Power Good Status Indication Output. PGOOD pulls to VSS when a valid input source is the desired logic voltage rail using a 10k Ω -100k Ω resistor.

Open-Drain Charging Status Indication Output. CHG pulls to VSS when the battery is charging. CHG is high impedance when charging is complete and when charger is disabled.

System Supply Output. OUT provides a regulated output when the input is below the OVP threshold and ceramic capacitor.

Adjustable Current Limit Programming Input. Connect a 1100 Ω to 8 k Ω resistor from ILIM to VSS to program charge current.

Input Power Connection. Connect IN to the connected to external DC supply (AC adapter or USB port). The input operating range is 4.35V to 6.6V (bq24072, bq24073, and bq24075) or 4.35V to 10.5V (bq23074). The input can accept voltages up to 26V without damage but operation is suspended. Connect bypass capacitor 1 µ F to 10 µ F to VSS.

Timer Programming Input. TMR controls the pre-charge and fast-charge safety timers. Connect TMR to VSS desired length. Leave TMR unconnected to set the timers to the default values.

Termination Enable Input. Connect TD to VSS to enable charger termination. Connect TD high to disable disabled. TD is internally pulled down to VSS with ~285 k Ω .

Termination Current Programming Input. Connect a 0 Ω to 15 k Ω resistor from ITERM to VSS to program the termination current. Leave ITERM unconnected to set the termination current to the internal default value.

System Enable Input. Connect SYSOFF high to disconnect OUT from the input power when . Internally pulled

–

up to V Fast Charge Current Programming Input. Connect a 750 Ω to 3 k Ω resistor from ISET to VSS to program the

fast charge current level. There is an internal electrical connection between the exposed thermal pad and the VSS pin of the device.

times.

through a large resistor (~5 M Ω ).

BAT

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075

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Q1

Q2

I

NTC

V

HOT

V

COLD

V

UVLO

V

OVP

Dynamically Controlled Oscillator

V

IPRECHG

V

ICHG

V

ISET

-100mV

CE

IN

EN1

EN2

PGOOD

TS

OUT

BAT

ISET

ILIM

TMR

OUT-SC2

Timersdisabled

SYSOFF ('75)

ITERM

('74)

V

BAT

250mV

FAST-CHARGE

and

PRE-CHARGE

TIMERS

VSS

CHARGE ANDDYNAMIC

POWERPATH

MANAGEMENT CONTROL

V

IN

V +V

BAT IN-DT

CHG

V

DIS(TS)

TD ('72,'73)

V

O(SCI)

OUT-SC1

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......................................................................................................................................................................................... SLUS810 – SEPTEMBER 2008

EN2 EN1 Maximum input current into IN pin

0 0 100 mA. USB100 mode 0 1 500 mA. USB500 mode 1 0 Set by an external resistor from ILIM to VSS 1 1 Standby (USB suspend mode)

SIMPLIFIED BLOCK DIAGRAM

bq24072 , bq24073 bq24074 , bq24075

Table 1. EN1/EN2 Settings

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075

I

BAT

V

OUT

V

4V

BAT

V

IN

2V/div

500mV/div

100mA/div

-200mA ChargingBattery

40ms/div

5V/div

40ms/div

I

BAT

V

4.4V

OUT

V

4V

BAT

V

IN

2V/div

5V

0V

500mV/div

200mA BatterySupplying Load

-200mA ChargingBattery

R =6.6

OUT

W

V

OUT

V

BAT

V

IN

2V/div

200ms/div

2V/div

5V/div

0

20

40

60

80

100

120

0

25

50 75 100

125

T -JunctionTemperature-°C

J

DropoutVoltage-V -V

BAT OUT

VBAT =3V

VBAT =3.9V

I =1 A

L

3

3.2

3.4

3.6

3.8

4

4.2

4.4

4.6

2

2.5

3

3.5 4

4.5

V -OutputVoltage-V

O

V -BatteryVoltage-V

BAT

V =5V

IN

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0 25

50 75

100

125

T -JunctionTemperature-°C

J

DropoutVoltage-V -V

IN OUT

I =1 A

L

5.25

5.30

5.35

5.40

5.45

5.50

5.55

5.60

5.65

5.70

5.75

0 25 50 75 100 125

T -JunctionTemperature-°C

J

V -OutputVoltage-V

O

V =6V, I =1 A

IN

L

4.30

4.33

4.35

4.38

4.40

4.43

4.45

0

25

50 75 100 125

T -JunctionTemperature-°C

J

V -OutputVoltage-V

O

V =5V, I =1 A

IN

L

3.60

3.62

3.64

3.66

3.68

3.70

3.72

3.74

3.76

3.78

3.80

0 25 50 75 100 125

T -JunctionTemperature-°C

J

V -OutputVoltage-V

O

V =5V, V =3.5V, I =1 A

IN

BAT

L

bq24072 , bq24073 bq24074 , bq24075

SLUS810 – SEPTEMBER 2008 .........................................................................................................................................................................................

TYPICAL CHARACTERISTICS

ADAPTER REMOVAL

BATTERY CONNECTED ADAPTER HOT-PLUG ADAPTER HOT-PLUG

R

= 6.6 Ω NO BATTERY CONNECTED BATTERY CONNECTED

OUT

Figure 1. Figure 2. Figure 3.

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DROPOUT VOLTAGE vs OUTPUT REGULATION VOLTAGE

DROPOUT VOLTAGE bq24072

vs TEMPERATURE vs

TEMPERATURE NO INPUT SUPPLY BATTERY VOLTAGE

Figure 4. Figure 5. Figure 6.

bq24072 bq24073/ 74 bq24075

OUTPUT REGULATION VOLTAGE OUTPUT REGULATION VOLTAGE OUTPUT REGULATION VOLTAGE

vs vs vs

TEMPERATURE TEMPERATURE TEMPERATURE

Figure 7. Figure 8. Figure 9.

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075

10.20

10.25

10.30

10.35

10.40

10.45

10.50

10.55

10.60

10.65

10.70

0

25

50

75

100

125

T -JunctionTemperature-°C

J

V -OutputVoltageThreshold-V

OVP

V Rising

I

V Falling

I

10.5V

6.45

6.50

6.55

6.60

6.65

6.70

0 25 50 75 100 125

T -JunctionTemperature-°C

J

V -OutputVoltageThreshold-V

OVP

6.6V

V Rising

I

V Falling

I

4.180

4.185

4.190

4.195

4.200

4.205

4.210

0

5

10 15 20

25

30

T -JunctionTemperature-°C

J

V -RegulationVoltage-V

BA

T

0

100

200

300

400

500

600

700

800

5 6 7 8 9 10

V -InputVoltage-V

I

I -InputCurrent-mA

LIM

RILIM

USB500

USB100

R=900

ISET

W

0.95

0.97

0.99

1.01

1.03

1.05

3

3.2

3.4

3.6

3.8

4 4.2

I -FastChargeCurrent- A

BAT

V -BatteryVoltage-V

BAT

R=3k

ISET

W

280

285

290

295

300

305

310

3 3.2 3.4 3.6 3.8 4 4.2

I -FastChargeCurrent- A

BAT

V -BatteryVoltage-V

BAT

28.5

29

29.5

30

30.5

31

31.5

2 2.2 2.4 2.6 2.8 3

I -PrechargeCurrent- A

BAT

V -BatteryVoltage-V

BAT

R=3k

ISET

W

95

96

97

98

99

100

101

102

103

104

105

2 2.2 2.4 2.6 2.8 3

I -PrechargeCurrent- A

BAT

V -BatteryVoltage-V

BAT

R=900

ISET

W

bq24072 , bq24073 bq24074 , bq24075

www.ti.com

......................................................................................................................................................................................... SLUS810 – SEPTEMBER 2008

TYPICAL CHARACTERISTICS (continued)

bq24072/ 73/ 75 bq24074

OVERVOLTAGE PROTECTION OVERVOLTAGE PROTECTION

BAT REGULATION VOLTAGE THRESHOLD THRESHOLD

vs vs vs

TEMPERATURE TEMPERATURE TEMPERATURE

Figure 10. Figure 11. Figure 12.

bq24072/ 73/ 75 bq24074

INPUT CURRENT LIMIT INPUT CURRENT LIMIT FASTCHARGE CURRENT

vs vs vs

INPUT VOLTAGE INPUT VOLTAGE BATTERY VOLTAGE

Figure 13. Figure 14. Figure 15.

FASTCHARGE CURRENT PRECHARGE CURRENT

vs vs

BATTERY VOLTAGE BATTERY VOLTAGE

Figure 16. Figure 17.

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075

V

OVP

V -V

OVP hys(OVP)

V +V

BAT IN(DT)

V +V -V

BAT IN(DT) hys(INDT)

UVLO

UVLO -V

hys(UVLO)

PGOOD

t

DGL(PGOOD)

t

DGL(OVP)

t

DGL(PGOOD)

t

DGL(NO-IN)

V

IN

t<t

DGL(OVP)

TypicalInputVoltage OperatingRange

V

BAT

V

LOWV

I

CHG

I

PRE-CHG

Pre-Charge

Fast-Charge

Pre-Charge

Fast-Charge

t<t

DGL1(LOWV)

t

DGL1(LOWV)

t

DGL2(LOWV)

t<t

DGL2(LOWV)

t

DGL1(LOWV)

V

RCH

V

BAT

t<t

DGL(RCH)

t

DGL(RCH)

Re-Charge

bq24072 , bq24073 bq24074 , bq24075

SLUS810 – SEPTEMBER 2008 .........................................................................................................................................................................................

EXPLANATION OF DEGLITCH TIMES AND COMPARATOR HYSTERESIS

Figures not to scale

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Figure 18. Power-Up, Power-Down

Figure 19. Pre- to Fast-Charge, Fast- to Pre-Charge Transition – t

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075

Figure 20. Recharge – t

DGL(RCH)

DGL1(LOWV)

, t

DGL2(LOWV)

Turn

Q2OFF

t

REC(SC2)

Force

Q2ON

Turn

Q2OFF

t

REC(SC2)

Force

Q2ON

V -V

BAT OUT

V

O(SC2)

Recover

t<t

DGL(SC2)

t

DGL(SC2)

t

DGL(SC2)

t<t

DGL(SC2)

V

COLD

V -V

COLD hys(COLD)

V -V

HOT hys(HOT)

V

HOT

V

TS

t<t

DGL(TS)

t

DGL(TS)

Suspend Charging

Resume Charging

bq24072 , bq24073 bq24074 , bq24075

www.ti.com

......................................................................................................................................................................................... SLUS810 – SEPTEMBER 2008

Figure 21. OUT Short-Circuit – Supplement Mode

DETAILED FUNCTIONAL DESCRIPTION

The bq2407x devices are integrated Li-Ion linear chargers and system power path management devices targeted at space-limited portable applications. The device powers the system while simultaneously and independently charging the battery. This feature reduces the number of charge and discharge cycles on the battery, allows for proper charge termination and enables the system to run with a defective or absent battery pack. It also allows instant system turn-on even with a totally discharged battery. The input power source for charging the battery and running the system can be an AC adapter or a USB port. The devices feature Dynamic Power Management, which shares the source current between the system and battery charging, and automatically reduces the charging current if the system load increases. Additionally, when charging from a USB port, the device reduces the input current if the input voltage falls below a threshold, preventing the USB port from crashing. The power-path architecture also permits the battery to supplement the system current requirements when the adapter cannot deliver the peak system currents. The startup state diagram is shown in Figure 23 .

Figure 22. Battery Pack Temperature Sensing – TS Pin. Battery Temperature Increasing

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075

AnyState

IfVIN<V

UVLO

,

gotoPowerDown

PowerDown AllIC functionsOFF /PGOOD=Hi-Z /CHG=Hi-Z Q2=ON

VIN>V

UVLO

No

Yes

Sleep /PGOOD=Hi-Z /CHG=Hi-Z Q2=ON

VIN>V

BAT

No

Yes

Standby

/CHG=Hi-Z Q2=ON

VIN<V

OVP

Yes

No

USBSuspend

Yes

No

BeginStartupChecks

Goto

BeginCharge

AnyState

IfVIN>V

OVP

,

gotoStandby

AnyState

IfUSBSuspend,

gotoStandby

ILIMshort

Yes

No

ISET short

Yes

No

V

OUT

<V

O(SC)

?

Yes

No

Idle

Q2=OFF

/CE= Low

Yes

No

TurnonQ1 @100mA

AnyState

IfV

OUT

<V

O(SC)

, gotoBeganStartup Check

/PGOOD=Hi-Z

/PGOOD=Low

TurnonQ1 @(EN1,EN2)

TD=High

No

Yes

Goto TerminationDisable

AnyState

IfVIN<V

BAT

,

gotoPowerDown

bq24072 , bq24073 bq24074 , bq24075

SLUS810 – SEPTEMBER 2008 .........................................................................................................................................................................................

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Figure 23. Startup State Diagram

UNDER-VOLTAGE LOCKOUT (UVLO)

The bq2407X family remains in power down mode when the input voltage at the IN pin is below the undervoltage threshold (UVLO).

During the power down mode the host commands at the control inputs ( CE, EN1 and EN2) are ignored. The Q1 FET connected between IN and OUT pins is off, and the status outputs CHG and PGOOD are high impedance. The Q2 FET that connects BAT to OUT is ON. (If SYSOFF is high, Q2 is off). During power down mode, the V

OUT(SC2)

circuitry is active and monitors for overload conditions on OUT.

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075

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POWER ON

When V commands at the control inputs ( CE, EN1 and EN2) are ignored. The Q1 FET connected between IN and OUT pins is off, and the status outputs CHG and PGOOD are high impedance. The Q2 FET that connects BAT to OUT is ON. (If SYSOFF is high, Q2 is off). During this mode, the V overload conditions on OUT.

Onve V and EN2 inputs are read. The device enters standby mode if (EN1 = EN2 = HI) or if an input overvoltage condition occurs. In standby mode, Q1 is OFF and Q2 is ON so OUT is connected to the battery input. (If SYSOFF is high, FET Q2 is off). During this mode, the V conditions on OUT.

When the input voltage at IN is within the valid range: V the EN1 and EN2 pins indicate that the USB suspend mode is not enabled [(EN1, EN2) ≠ (HI, HI)] all internal timers and other circuit blocks are activated. The device then checks for short-circuits at the ISET and ILIM pins. If no short conditions exists, the device switches on the input FET Q1 with a 100mA current limit to checks for a short circuit at OUT. If V and R input source (Q1 is on), and the device continuously monitors the status of CE, EN1 and EN2 as well as the input voltage conditions. Q2 is turned on to charge the battery and whenever the input source cannot deliver the required load current (supplement mode).

......................................................................................................................................................................................... SLUS810 – SEPTEMBER 2008

exceeds the UVLO threshold, the bq2407x powers up. While V

IN

OUT(SC2)

rises above V

IN

and the device enters into the normal operation. During normal operation, the system is powered by the

ILIM

+ V

BAT

rises above V

OUT

, PGOOD is driven low to indicate the valid power status and the CE, EN1,

IN(DT)

OUT(SC2)

> UVLO AND V

IN

, the FET Q1 switches to the current limit threshold set by EN1, EN2

SC

circuitry is active and monitors for overload

is below V

IN

+ V

BAT

circuitry is active and monitors for

> V

IN

+ V

BAT

AND V

IN(DT)

, the host

IN(DT)

< V

IN

, and

OVP

POWER-PATH MANAGEMENT

The bq2407x features an OUT output that powers the external load connected to the battery. This output is active whenever a source is connected to IN or BAT. The following sections discuss the behavior of OUT with a source connected to IN to charge the battery and a battery source only.

IN SOURCE CONNECTED

With a source connected, the power-path management circuitry of the bq2407x monitors the input current continuously. The OUT output for the bq24073/ 74/ 75 is regulated to a fixed voltage (V the OUT output is regulated to 200mV above the voltage at BAT. When the BAT voltage falls below 3.2V, OUT is clamped to 3.4V. Therefore, the minimum voltage at OUT with an adapter connected is 3.4V, allowing for proper startup of the system load. The current into IN is shared between charging the battery and powering the system load at OUT. The bq2407x has internal selectable current limits of 100mA (USB100) and 500mA (500mA) for charging from USB ports, as well as a resistor-programmable input current limit. The power path utilizes additional feature for operation from current-limited USB ports. When EN1 and EN2 are configured for USB100 (EN2=0, EN1=0) or USB500 (EN2=0, EN2=1) modes, the input voltage is monitored. If V input current limit is reduced to prevent the input voltage from falling further.

The input current limit selection is controlled by the state of the EN1 and EN2 pins as shown in Table 1 . When using the resistor-programmable current limit, the input current limit is set by the value of the resistor connected from the ILIM pin to VSS, and is given by the equation:

I

= K

IN-MAX

/R

ILIM

The input current limit is adjustable up to 1.5A. The valid resistor range is 1.1 k Ω to 8 k Ω . When the IN source is connected, priority is given to the system load. The DPM and Battery Supplement modes

are used to maintain the system load. Figure 24 and Figure 25 illustrate examples of the DPM and supplement modes. These modes are explained in detail in the following sections.

). For the bq24072,

O(REG)

IN

falls to V

, the

IN-LOW

DPM Mode

When the sum of the charging and system load currents exceeds the preset maximum input current (programmed with EN1, EN2 and ILIM pins), the voltage at OUT decreases. Once the voltage on the OUT pin falls to V

, the bq2407x enters DPM mode. In this mode, the charging current is reduced as the OUT current

DPM

goes up in order to maintain the system output.

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075

A

1200mA

900mA

400mA

0mA

I

OUT

900mA

500mA

0mA

I

IN

500mA

-300mA

0mA

I

BAT

3.8V

3.7V

~3.6V

V

OUT

DPMLoop Active

SupplementMode

bq24072 , bq24073 bq24074 , bq24075

SLUS810 – SEPTEMBER 2008 .........................................................................................................................................................................................

Battery Supplement Mode

While in DPM mode, if the charging current falls to zero and the system load current increases beyond the programmed input current limit, the voltage at OUT reduces further. When the OUT voltage drops below the V when the voltage at OUT rises above the V

threshold, the battery supplements the system load. The battery stops supplementing the system load

BSUP1

threshold.

BSUP2

During supplement mode, the battery supplement current is not regulated, however there is a short circuit protection circuit built in. If during battery supplement mode, the voltage at OUT drops 250mV below the BAT voltage, the OUT output is turned off if the overload exists after t

DGL(SC2)

and the device enters Power-On Reset

Mode

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Figure 24. bq24072 DPM and Battery Supplement Modes (V

= V

OREG

BAT

+ 200mV, V

= 3.6V)

BAT

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075

A

1200mA

900mA

400mA

0mA

I

OU

T

900mA

500mA

0mA

I

IN

500mA

-300mA

0mA

I

BA

T

4.4V

4.3V

~3.6V

V

OU

T

DPMLoop Active

SupplementMode

bq24072 , bq24073 bq24074 , bq24075

www.ti.com

......................................................................................................................................................................................... SLUS810 – SEPTEMBER 2008

Figure 25. bq24073 DPM and Battery Supplement Modes (V

IN SOURCE NOT CONNECTED

When no source is connected to the IN input, OUT is powered strictly from the battery. During this mode the current into OUT is not regulated, similar to Battery Supplement Mode, however the short circuit circuitry is active. If the OUT voltage falls below the BAT voltage by 250mV for longer than t short circuit recovery timer then starts counting. After t

REC(SC2)

, OUT turns on and attempts to restart. If the short circuit remains, OUT is turned off and the counter restarts. This ON/OFF cycle continues until the overload condition is removed.

=4.4V, V

OREG

DGL(SC2)

= 3.6V)

BAT

, OUT is turned off. The

BATTERY CHARGING

Dive CE low after IC startup to initiate battery charging. First, the device checks for a short-circuit on the BAT pin by sourcing I

BAT(SC)

battery charging continues. The battery is charged in three phases: conditioning pre-charge, constant current fast charge (current regulation) and a constant voltage tapering (voltage regulation). In all charge phases, an internal control loop monitors the IC junction temperature and reduces the charge current if an internal temperature threshold is exceeded.

Figure 26 illustrates a normal Li-Ion charge cycle using the bq2407x:

to the battery and monitoring the voltage. When the BAT voltage exceeds V

BAT(SC)

, the

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075

PRECHARGE CCFASTCHARGE CVTAPER DONE

BatteryVoltage

BatteryCurrent

CHG=Hi-z

V

BAT(REG)

I

O(CHG)

V

LOWV

I

(PRECHG)

I

(TERM)

bq24072 , bq24073 bq24074 , bq24075

SLUS810 – SEPTEMBER 2008 .........................................................................................................................................................................................

www.ti.com

Figure 26. Typical Charge Cycle

In the pre-charge phase, the battery is charged at with the pre-charge current (I crosses the V reaches V

BAT(REG)

battery approaches full charge. When the battery current reaches I

threshold, the battery is charged with the fast-charge current (I

LOWV

, the battery is held at a constant voltage of V

BAT(REG)

TERM

and the charge current tapers off as the

, the CHG pin indicates charging done by

PRECHG

). Once the battery voltage

). As the battery voltage

CHG

going high-impedance. Note that termination detection is disabled whenever the charge rate is reduced from the set point because of the

actions of the thermal loop, the DPM loop or the V

loop.

IN(LOW)

The value of the fast-charge current is set by the resistor connected from the ISET pin to VSS, and is given by the equation

I

= K

CHG

The charge current limit is adjustable up to 1.2A. The valid resistor range is 750 Ω to 3 k Ω . Note that if I programmed as greater than the input current limit, the battery will not charge at the rate of I

/R

ISET

, but at the

CHG

slower rate of IINmax (minus the load current on the OUT pin, if any). In this case, the charger timers will be proportionately slowed down. Figure 27 illustrates the battery charger state diagram.

is

CHG

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075

BeginCharge

V

BAT

>V

BAT(SC)

No

Yes

GotoFault

TurnonI

BAT(SC)

TurnoffI

BAT(SC)

Resett

PRECHG

/CHG=Low

Pre-Charge

Enablet

PRECHG

EnableI

PRECHG

V

BAT

>V

LOWV

No

Yes

t

PRECHG

timeout

No

Yes

TSHot,Cold

Yes

Turnoffcharger Halt t

PRECHG

GotoFault

DisableI

PRECHG

Resett

MAXCHG

CC/CVCharge

Enablet

MAXCHG

EnableI

CHG

I

BAT

<I

TERM

No

Yes

t

MAXCHG

timeout

Yes

TSHot,Cold

Yes

Turnoffcharger Halt t

MAX CHG

No

Turnoffcharger /CHG=Hi-Z Goto

Re-Charge

AnyState

IfVIN<V

UVLO

,

gotoPowerDown

AnyState

IfVIN>V

OVP

,

gotoStandby

AnyState

If /CE=High,

gotoIdle

AnyState

IfV

BAT

<V

BAT(SC)

,

gotoBeginCharge

AnyState

IfV

OUT

<V

O(SC)

, gotoBegin StartupChecks

AnyState

IfUSBSuspend,

gotoStandby

AnyState

IfVIN<V

BAT

,

gotoPowerDown

TJ> T

J(OFF)

Yes

Turnoffcharger Halt t

PRECHG

No

TJ> T

J(OFF)

Yes

Turnoffcharger Halt t

MAX CHG

TD=1

High

No

Yes

Reset Timers Goto

Termination Disabled

TD=1

Low

No

Yes

Reset Timers Goto

Termination Disabled

V

BAT

>V

LOWV

No

Yes

bq24072 , bq24073 bq24074 , bq24075

www.ti.com

......................................................................................................................................................................................... SLUS810 – SEPTEMBER 2008

Figure 27. Charging State Diagram

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075

bq24072 , bq24073 bq24074 , bq24075

SLUS810 – SEPTEMBER 2008 .........................................................................................................................................................................................

ADJUSTABLE TERMINATION THRESHOLD (ITERM Input, bq24074)

The termination current threshold in the bq24074 is user-programmable. Set the termination current by connecting a resistor from ITERM to VSS. For USB100 mode (EN1 = EN2 = Low), the termination current value is calculated as:

I

TERM

= 0.01 × R

/ R

ITERM

ISET

In the other input current limit modes (EN1 ≠ EN2), the termination current value is calculated as:

I

= 0.03 × R

TERM

The termination current is programmable up to 50% of the fastcharge current. The R

/ R

ITERM

ISET

resistor must be less

ITERM

than 15 k Ω . Leave ITERM unconnected to select the default internally set termination current.

TERMINATION DISABLE (TD Input, bq24072, bq24073)

The bq24072 and bq24073 contain a TD input that allows termination to be enabled/ disabled. Connect TD to a logic high to disable charge termination. When termination is disabled, the device goes through the pre-charge, fast-charge and CV phases, then remains in the CV phase. During the CV phase, the charger maintains the output voltage at BAT equal to V I

or IINmax, whichever is less. Battery detection is not performed. The CHG output is high impedance once

CHG

the current falls below I

TERM

BAT(REG)

and does not go low until the input power is toggled. When termination is disabled,

, and charging current does not terminate. BAT sources currents up to

the pre-charge and fast-charge safety timers are also disabled. Battery pack temperature sensing (TS pin functionality) is disabled if the TD pin is high and the TS pin is unconnected or pulled up to V

.

IN

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Product Folder Link(s): bq24072 bq24073 bq24074 bq24075

Termination

Disabled

V

BAT

> V

BAT(SC)

No

Yes

TurnonI

BAT(SC)

TurnoffI

BAT(SC)

/CHG = Low

Enable I

PRECHG

V

BAT

> V

LOWV

No

Yes

TSHot , Cold

Yes

Turnoffcharger

Enable I

CHG

I

BAT

< I

TERM

?

No

Yes

TSHot ,Cold

Yes

Turnoffcharger

No

AnyState

If VIN< V

UVLO

,

gotoPowerDown

AnyState

If VIN> V

OVP

,

gotoStandby

AnyState

If /CE = High,

gotoIdle

AnyState

If V

BAT

< V

BAT(SC)

,

goto

AnyState

If V

OUT

< V

O(SC)

,

gotoReset

AnyState

IfUSBSuspend,

gotoStandby

AnyState

If VIN< V

BAT

,

gotoPowerDown

TJ> T

J(OFF)

Yes

Turnoffcharger

No

TJ> T

J(OFF)

Yes

Turnoffcharger

TD = LOW

No

Yes

Goto

BeginCharge

TD = LOW

No

Yes

Goto

BeginCharge

TD = LOW

Yes

Disable

Goto

BeginCharge

TSHot ,Cold

Yes

Turnoffcharger

No

TJ> T

J(OFF)

Yes

Turnoffcharger

No

/CHG = Hi-Z

No

I

PRECHG

Disabled

No

Termination

bq24072 , bq24073 bq24074 , bq24075

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......................................................................................................................................................................................... SLUS810 – SEPTEMBER 2008

Figure 28. Termination State Diagram

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075

Re- Charge

V

BAT

<V

RCH

No

Yes

SinkI

BAT(DET)

fort

DET

V

BAT

>V

LOWV

Yes

No

EnableI

PRECH

fort

DET

V

BAT

>V

RCH

No

BatteryInserted

Goto

BeginCharge

SinkI

BAT(DET)

fort

DET

V

BAT

<V

LOWV

BatteryInserted

Goto

BeginCharge

Yes

Reset t

MAXCHG

Goto

CC/CVCharge

No

Yes

AnyState

IfVIN<V

UVLO

,

gotoPowerDown

AnyState

IfVIN>V

OVP

,

gotoStandby

AnyState

If /CE=High,

gotoIdle

AnyState

IfV

BAT

<V

BAT(SC)

,

gotoBeginCharge

AnyState

IfV OUT <V

O(SC)

, gotoBegin SystemCheck

AnyState

IfUSBSuspend,

gotoStandby

AnyState

IfVIN<V

BAT

,

gotoPowerDown

SinkI

BAT(DET)

fort

DET

bq24072 , bq24073 bq24074 , bq24075

SLUS810 – SEPTEMBER 2008 .........................................................................................................................................................................................

BATTERY DETECTION AND RECHARGE

The bq2407x automatically detects if a battery is connected or removed. Once a charge cycle is complete, the battery voltage is monitored. When the battery voltage falls below V battery has been removed. A current, I BAT pin remains above V

, it indicates that the battery is still connected, but has discharged. If CE is low, the

LOWV

BAT(DET)

, is pulled from the battery for a duration t

, the device determines whether the

RCH

. If the voltage on the

DET

charger is turned on again to top off the battery. During this recharge cycle, the CHG output remains high-impedance: Recharge cycles are not indicated by the CHG pin.

If the BAT voltage falls below V removed. The device then checks for battery insertion. The FET Q2 is turned on and sources I for the duration of t

. If the battery voltage does not rise above V

DET

inserted, and a new charge cycle begins. If the voltage rises above V battery has been inserted. To check for this, I V

, a battery is not present. The device continuously checks for the presence of a battery.

LOWV

during the battery detection test, it indicates that the battery has been

LOWV

, it indicates that a battery has been

RCH

, it is possible that a fully charged

BAT(DET)

is pulled from the battery for t

RCH

. If the voltage falls below

DET

PRECHG

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out of BAT

Figure 29. Re-Charge State Diagram

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075

bq24072 , bq24073 bq24074 , bq24075

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BATTERY DISCONNECT (SYSOFF Input, bq24075)

The bq24075 features a SYSOFF input that allows the user to turn the FET Q2 off and disconnect the battery from the OUT pin. This is useful for disconnecting the system load from the battery, factory programming where the battery is not installed or for host side charge monitoring where the OCV level must be monitored. The /CHG output remains low when SYSOFF is low. Connect SYSOFF to VSS, to turn Q2 on for normal operation. SYSOFF is internally pulled to VBAT through ~285 k Ω resistor.

DYNAMIC CHARGE TIMERS (TMR Input)

The bq2407x devices contain internal safety timers for the pre-charge and fast-charge phases to prevent potential damage to the battery and the system. The timers begin at the start of the respective charge cycles. The timer values are programmed by connecting a resistor from TMR to VSS. The resistor value is calculated using the following equation:

Leave TMR unconnected to select the internal default timers. Disable the timers by connecting TMR to VSS. Note that timers are suspended when the device is in thermal shutdown, and the timers are slowed proportionally

to the charge current when the device enters thermal regulation. For the bq24072 and bq24073, the timers are disabled when TD is connected to a high logic level.

During the fast charge phase, several events increase the timer durations.

1. The system load current activates the DPM loop which reduces the available charging current

2. The input current is reduced because the input voltage has fallen to V

3. The device has entered thermal regulation because the IC junction temperature has exceeded T

During each of these events, the internal timers are slowed down proportionately to the reduction in charging current. For example, if the charging current is reduced by half, the fast charge timer is twice as long as long as programmed.

If the pre charge timer expires before the battery voltage reaches V Additionally, if the battery current does not fall to I The CHG output flashes at approximately 2 Hz to indicate a fault condition.

......................................................................................................................................................................................... SLUS810 – SEPTEMBER 2008

t t

= K

PRECHG MAXCHG

TMR

= 10 × K

× R

TMR

× R

TMR

IN(LOW)

, the bq2407x indicates a fault condition.

before the fast charge timer expires, a fault is indicated.

TERM

LOWV

J(REG)

STATUS INDICATORS ( PGOOD, CHG)

The bq2407x contains two open-drain outputs that signal its status. The PGOOD output signals when a valid input source is connected. PGOOD is low when (V

+ V

BAT

) < V

IN(DT)

< V

IN

. When the input voltage is outside

OVP

of this range, PGOOD is high impedance. The CHG output signals when a new charge cycle is initiated. After a charge cycle is initiated, CHG goes low

once the battery is above the short circuit threshold. CHG goes high impedance once the charge current falls below I

. CHG remains high impedance until the input power is removed and reconnected or the CE pin is

TERM

toggled. It does not signal subsequent recharge cycles. In additions, CHG signals timer faults by flashing at approximately 2Hz.

THERMAL REGULATION AND THERMAL SHUTDOWN

The bq2407x contain a thermal regulation loop that monitors the die temperature. If the temperature exceeds T

, the device automatically reduces the charging current to prevent the die temperature from increasing

J(REG)

further. In some cases, the die temperature continues to rise despite the operation of the thermal loop, particularly under high VIN and heavy OUT system load conditions. Under these conditions, if the die temperature increases to T battery still powers the load on OUT. Once the device die temperature cools by T

, the input FET Q1 is turned OFF. FET Q2 is turned ON to ensure that the

J(OFF)

J(OFF-HYS)

, the input FET Q1 is turned on and the device returns to thermal regulation. Continuous overtemperature conditions result in the pulsing of the Q1 FET.

Note that this feature monitors the die temperature of the bq2407x. This is not synonymous with ambient temperature. Self heating exists due to the power dissipated in the IC because of the linear nature of the battery charging algorithm and the LDO associated with OUT. A modified charge cycle with the thermal loop active is shown in Figure 30 :

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075

PRECHARGE CCFAST

CHARGE

CVTAPER DONETHERMAL

REGULATION

BatteryVoltage

BatteryCurrent

HI-z

ICJunctionTemperature,T

J

V

O(REG)

I

O(CHG)

V

(LOWV)

I

(PRECHG)

I

(TERM)

T

J(REG)

bq24072 , bq24073 bq24074 , bq24075

SLUS810 – SEPTEMBER 2008 .........................................................................................................................................................................................

www.ti.com

Figure 30. Charge Cycle Modified by Thermal Loop

BATTERY PACK TEMPERATURE MONITORING

The bq2407x features an external battery pack temperature monitoring input. The TS input connects to the NTC resistor in the battery pack to monitor battery temperature and prevent dangerous over-temperature conditions.

During charging, I

is sourced to TS and the voltage at TS is continuously monitored. If, at any time, the

NTC

voltage at TS is outside of the operating range (V

to V

COLD

HOT

), charging is suspended. The timers maintain their values but suspend counting. When the voltage measured at TS returns to within the operation window, charging is resumed and the timers continue counting. When charging is suspended due to a battery pack temperature fault, the CHG pin remains low and continues to indicate charging.

For the bq24072 and bq24073, battery pack temperature sensing is disabled when termination is disabled (TD = High) and the voltage at TS is greater than V

. The battery pack temperature monitoring is disabled

DIS(TS)

by connecting a 10 k Ω resistor from TS to VSS.

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075

IN

VSS

BAT

DC+

GND

Adaptor

HOST

bq24072

CE

OUT

CHG

PGOOD

TD

EN1

EN2

TS

TMR

ILIM

ISET

TEMP

PACK+

PACK-

C1

1µF

C2

4.7µF

C3

4.7µF

R3

1.13 kO

R2

1 kO

R4

1.5 kO

R5

1.5 kO

R1

49.9 kO

SYSTEM

IN

VSS

BAT

DC+

GND

Adaptor

bq24074

CE

OUT

CHG

PGOOD

TMR

EN1

EN2

TS

ITERM

ILIM

ISET

TEMP

PACK+

PACK-

C1

1µF

C2

4.7µF

C3

4.7µF

R3

1.13 kO

R2

1 kO

R4

1.5 kO

R5

1.5 kO

R1

4.53 kO

SYSTEM

www.ti.com

......................................................................................................................................................................................... SLUS810 – SEPTEMBER 2008

TYPICAL APPLICATION CIRCUITS

1) Charging a pack under host control, timers disabled

bq24072 , bq24073 bq24074 , bq24075

Figure 31. Host Controlled Charger Application Circuit

2) Stand-alone charger

Figure 32. Stand Alone Charger Application Circuit

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075

bq24072 , bq24073 bq24074 , bq24075

SLUS810 – SEPTEMBER 2008 .........................................................................................................................................................................................

bq24074 CHARGER DESIGN EXAMPLE

Refer to Figure 32 for Schematic of Design Example.

Requirements

• Supply voltage = 5V

• Fast charge current of approximately 900 mA; ISET - pin 16

• Input Current Limit =1.5A; ILIM - pin 12

• Termination Current Threshold = 120mA; ITERM – pin 15

• Safety timer duration, Fast-Charge = 6.25 hours; TMR – pin 14

• TS – Battery Temperature Sense = 10k Ω NTC (103AT)

Calculations

Program the Fast Charge Current (ISET):

R

= K

ISET

K

= 900 A Ω fom the electrical characteristics table.

ISET

R

= 900A Ω /0.8A = 1.125 k Ω

ISET

Select the closest standard value, which for this case is 1.13k Ω . Connect this resistor between ISET (pin 16) and V

.

SS

/ I

ISET

CHG

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Program the Input Current Limit (ILIM)

R

= K

ILIM

K

= 1600 A Ω fom the electrical characteristics table.

ILIM

R

= 1600A Ω / 1.5A = 1.067 k Ω

ISET

/ I

ILMI

I_MAX

Select the closest standard value, which for this case is 1 k Ω . Connect this resistor between ILIM (pin 12) and V

.

SS

Program the Termination Current Threshold (I

R R R

= I

ITERM

= 1.13 k Ω fom the above calculation.

ISET

= 120mA × 1.13 k Ω / 0.030 = 4.52 k Ω

ITERM

× R

TERM

/ 0.030

ISET

)

TERM

Select the closest standard value, which for this case is 4.53k Ω . Connect this resistor between ITERM (pin 15) and V

. Note that when in USB100 mode (EN1 = EN2 = V

SS

), the termination threshold is 1/3 of the normal

SS

threshold.

Program 6.25-hour Fast-Charge Saftey Timer (TMR)

R

= t

TMR

MAXCHG

K

= 45 s/k Ω fom the electrical characteristics table.

TMR

R

= (6.25 hr × 3600 s/hr) / (10 × 45 s/k Ω ) = 50 k Ω

TMR

/ (10 × K

)

TMR

Select the closest standard value, which for this case is 49.9 k Ω . Connect this resistor between TMR (pin 2) and V

.

SS

TS Function

Use a 10k Ω NTC thermistor in the battery pack (103AT). To Disable the temp sense function, use a fixed 10k Ω resistor between the TS (Pin 1) and V

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075

.

SS

bq24072 , bq24073 bq24074 , bq24075

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CHG and PGOOD

LED Status: connect a 1.5k Ω resistor in series with a LED between OUT and CHG and OUT and PGOOD. Processor Monitoring Status: connect a pullup resistor (on the order of 100 k Ω ) between the processor ’ s power

rail and CHG and PGOOD

SELECTING IN, OUT AND BAT pin CAPACITORS

In most applications, all that is needed is a high-frequency decoupling capacitor (ceramic) on the power pin, input, output and battery pins. Using the values shown on the application diagram, is recommended. After evaluation of these voltage signals with real system operational conditions, one can determine if capacitance values can be adjusted toward the minimum recommended values (DC load application) or higher values for fast high amplitude pulsed load applications. Note if designed high input voltage sources (bad adaptors or wrong adaptors), the capacitor needs to be rated appropriately. Ceramic capacitors are tested to 2x their rated values so a 16V capacitor may be adequate for a 30V transient (verify tested rating with capacitor manufacturer).

THERMAL PACKAGE

The bq24072/3/4/5 family is packaged in a thermally enhanced MLP package. The package includes a thermal pad to provide an effective thermal contact between the IC and the printed circuit board (PCB). The power pad should be directly connected to the V application note entitled: QFN/SON PCB Attachment Application Note (SLUA271 ). The most common measure of package thermal performance is thermal impedance ( θ air surrounding the package surface (ambient). The mathematical expression for θ

θ

JA

Where: TJ= chip junction temperature T = ambient temperature P = device power dissipation Factors that can greatly influence the measurement and calculation of θ

1. Whether or not the device is board mounted

2. Trace size, composition, thickness, and geometry

3. Orientation of the device (horizontal or vertical)

4. Volume of the ambient air surrounding the device under test and airflow

5. Whether other surfaces are in close proximity to the device being tested

Due to the charge profile of Li-Ion batteries the maximum power dissipation is typically seen at the beginning of the charge cycle when the battery voltage is at its lowest. Typically after fast charge begins the pack voltage increases to ~3.4V within the first 2 minutes. The thermal time constant of the assembly typically takes a few minutes to heat up so when doing maximum power dissipation calculations, 3.4V is a good minimum voltage to use. This is easy to verify, with the system and a fully discharged battery, by plotting temperature on the bottom of the PCB under the IC (pad should have multiple vias), the charge current and the battery voltage as a function of time. The fast charge current will start to taper off if the part goes into thermal regulation.

The device power dissipation, P, is a function of the charge rate and the voltage drop across the internal PowerFET. It can be calculated from the following equation when a battery pack is being charged : P = [V V

(OUT)

The thermal loop feature reduces the charge current to limit excessive IC junction temperature. It is recommended that the design not run in thermal regulation for typical operating conditions (nominal input voltage and nominal ambient temperatures) and use the feature for non typical situations such as hot environments or higher than normal input source voltage. With that said, the IC will still perform as described, if the thermal loop is always active.

......................................................................................................................................................................................... SLUS810 – SEPTEMBER 2008

pin. Full PCB design guidelines for this package are provided in the

SS

) measured (or modeled) from the chip junction to the

JA

= (T

- T) / P

J

include:

JA

] × I

+ [V

(OUT)

– V

(OUT)

] × I

(BAT)

is:

JA

–

(IN)

Product Folder Link(s): bq24072 bq24073 bq24074 bq24075

bq24072 , bq24073 bq24074 , bq24075

SLUS810 – SEPTEMBER 2008 .........................................................................................................................................................................................

Half-Wave Adaptors

Some low cost adapters implement a half rectifier topology, which causes the adapter output voltage to fall below the battery voltage during part of the cycle. To enable operation with low cost adapters under those conditions the bq2407x family keeps the charger on for at least 20 msec (typical) after the input power puts the part in sleep mode. This feature enables use of external low cost adapters using 50 Hz networks.

Seep Mode

After entering sleep mode for >20mS the internal FET connection between the IN and OUT pin is disabled and pulling the input to ground will not discharge the battery, other than the leakage on the BAT pin. If one has a full 1000mAHr battery and the leakage is 10 µ A, then it would take 1000mAHr/10 µ A = 100000 hours (11.4 years) to discharge the battery. The battery ’ s self discharge is typically 5 times higher than this.

Layout Tips

• To obtain optimal performance, the decoupling capacitor from IN to GND (thermal pad) and the output filter

capacitors from OUT to GND (thermal pad) should be placed as close as possible to the bq2407x, with short trace runs to both IN, OUT and GND (thermal pad).

• All low-current GND connections should be kept separate from the high-current charge or discharge paths

from the battery. Use a single-point ground technique incorporating both the small signal ground path and the power ground path.

• The high current charge paths into IN pin and from the OUT pin must be sized appropriately for the maximum

charge current in order to avoid voltage drops in these traces

• The bq2407x family is packaged in a thermally enhanced MLP package. The package includes a thermal pad

to provide an effective thermal contact between the IC and the printed circuit board (PCB); this thermal pad is also the main ground connection for the device. Connect the thermal pad to the PCB ground connection. Full PCB design guidelines for this package are provided in the application note entitled: QFN/SON PCB Attachment Application Note (SLUA271 ).

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Product Folder Link(s): bq24072 bq24073 bq24074 bq24075

PACKAGE OPTION ADDENDUM

www.ti.com

13-Nov-2008

PACKAGING INFORMATION

Orderable Device Status

(1)

Package

Type

Package Drawing

Pins Package

Qty

Eco Plan

BQ24072RGTR ACTIVE QFN RGT 16 3000 Green (RoHS &

no Sb/Br)

BQ24072RGTRG4 ACTIVE QFN RGT 16 3000 Green (RoHS &

no Sb/Br)

BQ24072RGTT ACTIVE QFN RGT 16 250 Green (RoHS &

no Sb/Br)

BQ24072RGTTG4 ACTIVE QFN RGT 16 250 Green (RoHS &

no Sb/Br)

BQ24073RGTR ACTIVE QFN RGT 16 3000 Green (RoHS &

no Sb/Br)

BQ24073RGTRG4 ACTIVE QFN RGT 16 3000 Green (RoHS &

no Sb/Br)

BQ24073RGTT ACTIVE QFN RGT 16 250 Green (RoHS &

no Sb/Br)

BQ24073RGTTG4 ACTIVE QFN RGT 16 250 Green (RoHS &

no Sb/Br)

BQ24074RGTR ACTIVE QFN RGT 16 3000 Green (RoHS &

no Sb/Br)

BQ24074RGTRG4 ACTIVE QFN RGT 16 3000 Green (RoHS &

no Sb/Br)

BQ24074RGTT ACTIVE QFN RGT 16 250 Green (RoHS &

no Sb/Br)

BQ24074RGTTG4 ACTIVE QFN RGT 16 250 Green (RoHS &

no Sb/Br)

BQ24075RGTR ACTIVE QFN RGT 16 3000 Green (RoHS &

no Sb/Br)

BQ24075RGTRG4 ACTIVE QFN RGT 16 3000 Green (RoHS &

no Sb/Br)

BQ24075RGTT ACTIVE QFN RGT 16 250 Green (RoHS &

no Sb/Br)

BQ24075RGTTG4 ACTIVE QFN RGT 16 250 Green (RoHS &

no Sb/Br)

(1)

The marketing status values are defined as follows:

ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in

a new design.

PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device.

(2)

Lead/Ball Finish MSL Peak Temp

CU NIPDAU Level-2-260C-1 YEAR

(3)

(2)

Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check

http://www.ti.com/productcontent for the latest availability information and additional product content details.

TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements

for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)

Addendum-Page 1

PACKAGE OPTION ADDENDUM

www.ti.com

(3)

MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder

temperature.

Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.

In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.

13-Nov-2008

Addendum-Page 2

PACKAGE MATERIALS INFORMATION

www.ti.com

TAPE AND REEL INFORMATION

21-Nov-2008

*All dimensions are nominal

Device Package

BQ24072RGTR QFN RGT 16 3000 330.0 12.4 3.3 3.3 1.1 8.0 12.0 Q2 BQ24072RGTT QFN RGT 16 250 180.0 12.4 3.3 3.3 1.1 8.0 12.0 Q2 BQ24073RGTR QFN RGT 16 3000 330.0 12.4 3.3 3.3 1.1 8.0 12.0 Q2 BQ24073RGTT QFN RGT 16 250 180.0 12.4 3.3 3.3 1.1 8.0 12.0 Q2 BQ24074RGTR QFN RGT 16 3000 330.0 12.4 3.3 3.3 1.1 8.0 12.0 Q2 BQ24074RGTT QFN RGT 16 250 180.0 12.4 3.3 3.3 1.1 8.0 12.0 Q2 BQ24075RGTR QFN RGT 16 3000 330.0 12.4 3.3 3.3 1.1 8.0 12.0 Q2 BQ24075RGTT QFN RGT 16 250 180.0 12.4 3.3 3.3 1.1 8.0 12.0 Q2

Type

Package

Drawing

Pins SPQ Reel

Diameter

(mm)

Reel

Width

W1 (mm)

A0 (mm) B0 (mm) K0 (mm) P1

(mm)W(mm)

Pin1

Quadrant

Pack Materials-Page 1

PACKAGE MATERIALS INFORMATION

www.ti.com

21-Nov-2008

*All dimensions are nominal

Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)

BQ24072RGTR QFN RGT 16 3000 346.0 346.0 29.0 BQ24072RGTT QFN RGT 16 250 190.5 212.7 31.8 BQ24073RGTR QFN RGT 16 3000 346.0 346.0 29.0 BQ24073RGTT QFN RGT 16 250 190.5 212.7 31.8 BQ24074RGTR QFN RGT 16 3000 346.0 346.0 29.0 BQ24074RGTT QFN RGT 16 250 190.5 212.7 31.8 BQ24075RGTR QFN RGT 16 3000 346.0 346.0 29.0 BQ24075RGTT QFN RGT 16 250 190.5 212.7 31.8

Pack Materials-Page 2

IMPORTANT NOTICE

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TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. Except where mandated by government requirements, testing of all parameters of each product is not necessarily performed.

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TEXAS INSTRUMENTS bq24072, bq24073, bq24074, bq24075 Technical data

Specifications and Main Features

Frequently Asked Questions

User Manual

FEATURES

DESCRIPTION

APPLICATIONS

TYPICAL APPLICATION CIRCUIT

DESCRIPTION (CONTINUED)

ABSOLUTE MAXIMUM RATINGS

DISSIPATION RATINGS

RECOMMENDED OPERATING CONDITIONS

ELECTRICAL CHARACTERISTICS

SIMPLIFIED BLOCK DIAGRAM

TYPICAL CHARACTERISTICS

EXPLANATION OF DEGLITCH TIMES AND COMPARATOR HYSTERESIS

DETAILED FUNCTIONAL DESCRIPTION

UNDER-VOLTAGE LOCKOUT (UVLO)

POWER ON

POWER-PATH MANAGEMENT

IN SOURCE CONNECTED

IN SOURCE NOT CONNECTED

BATTERY CHARGING

ADJUSTABLE TERMINATION THRESHOLD (ITERM Input, bq24074)

TERMINATION DISABLE (TD Input, bq24072, bq24073)

BATTERY DETECTION AND RECHARGE

BATTERY DISCONNECT (SYSOFF Input, bq24075)

DYNAMIC CHARGE TIMERS (TMR Input)

STATUS INDICATORS ( PGOOD, CHG)

THERMAL REGULATION AND THERMAL SHUTDOWN

BATTERY PACK TEMPERATURE MONITORING

TYPICAL APPLICATION CIRCUITS

1) Charging a pack under host control, timers disabled

2) Stand-alone charger

bq24074 CHARGER DESIGN EXAMPLE

Requirements

Calculations

TS Function

CHG and PGOOD

SELECTING IN, OUT AND BAT pin CAPACITORS

THERMAL PACKAGE

Half-Wave Adaptors

Seep Mode

Layout Tips