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

www.ti.com

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