TEXAS INSTRUMENTS bq24090, bq24091, bq24092, bq24093 Technical data

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1 Fm

1kW

1.5kW

2kW

Disconnect after Detection

Battery Pack

VBUS

GND

D+

D-

USB Port

DC+

GND

Adaptor

VDD

D-

D+

GND

TTDM

Host

System Load

ISET/100/500mA

ISET

VSS

PRETERM

ISET2

CHG

OUT

bq2409x

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bq24090, bq24091 bq24092, bq24093

SLUS968B –JANUARY 2010–REVISED JUNE 2010

1A, Single-Input, Single Cell Li-Ion Battery Charger

Check for Samples: bq24090, bq24091, bq24092, bq24093

FEATURES

• CHARGING – 1% Charge Voltage Accuracy – 10% Charge Current Accuracy – Pin Selectable USB 100mA and 500mA

Maximum Input Current Limit

– Programmable Termination and Precharge

Threshold

• PROTECTION – 6.6V Over-Voltage Protection – Input Voltage Dynamic Power Management – 125°C Thermal Regulation; 150°C Thermal

Shutdown Protection

– OUT Short-Circuit Protection and ISET

Short Detection

– Operation Over JEITA Range via Battery

NTC – ½ Fast-Charge-Current at Cold,

4.06V at Hot, bq24092/3

– Fixed 10 Hour Safety Timer

• SYSTEM – Automatic Termination and Timer Disable

Mode (TTDM) for Absent Battery Pack With

Thermistor – Status Indication – Charging/Done – Available in Small 10-Pin MSOP Package

APPLICATIONS

• Smart Phones

• PDAs

• MP3 Players

• Low-Power Handheld Devices

DESCRIPTION

The bq2409x series of devices are highly integrated Li-ion linear chargers 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 bq2409x has a single power output that charges the battery. A system load can be placed in parallel with the battery as long as the average system load does not keep the battery from charging fully during the 10 hour safety timer.

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 an internal temperature threshold is exceeded.

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.

bq24090, bq24091 bq24092, bq24093

SLUS968B –JANUARY 2010–REVISED JUNE 2010

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 pre-charge current and termination current threshold are programmed via an external resistor. The fast charge current value is also programmable via an external resistor.

ORDERING INFORMATION

PART # V

bq24090 4.20 V 6.6 V No 10kΩ NTC Yes 10 PIN 5x3mm bq24091 4.20 V 6.6 V No 100kΩ NTC Yes 10 PIN 5x3mm bq24092 4.20 V 6.6 V Yes 10kΩ NTC Yes 10 PIN 5x3mm bq24093 4.20 V 6.6 V Yes 100kΩ NTC Yes 10 PIN 5x3mm

O(REG)

OVP

JEITA TS/CE PG PACKAGE Marking

2 2 2 2

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bq24090 bq24091 bq24092 bq24093

ABSOLUTE MAXIMUM RATINGS

(1)

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

VALUE UNIT

IN (with respect to VSS) –0.3 to 7 V

Input Voltage

Input Current IN 1.25 A Output Current (Continuous) OUT 1.25 A

Output Sink Current CHG 15 mA T T

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

Junction temperature –40 to 150 °C

Storage temperature –65 to 150 °C

STG

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.

PACKAGE DISSIPATION RATINGS

PACKAGE R

5x3mm MSOP 52°C/W 48°C/W 1.92 W 19.2 mW/°C

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

Web site at www.ti.com.

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

connected to the ground plane by a 2×3 via matrix

OUT (with respect to VSS) –0.3 to 7 V PRE-TERM, ISET, ISET2, TS, CHG, PG, ASI, ASO (with respect to

VSS)

(1) (2)

qJA

qJC

TA≤ 25°C DERATING FACTOR

POWER RATING TA> 25°C

–0.3 to 7 V

Product Folder Link(s): bq24090 bq24091 bq24092 bq24093

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bq24090, bq24091 bq24092, bq24093

SLUS968B –JANUARY 2010–REVISED JUNE 2010

RECOMMENDED OPERATING CONDITIONS

(1)

MIN MAX UNIT

OUT

PRE-TERM

ISET

IN voltage range 3.5 7 V IN operating voltage range, Restricted by V

DPM

and V

OVP

4.45 6.45 V Input current, IN pin 1.0 A Current, OUT pin 1.0 A Junction temperature 0 125 °C Programs precharge and termination current thresholds 1 10 kΩ Fast-charge current programming resistor 0.675 49.9 kΩ 10k NTC thermistor range without entering BAT_EN or TTDM 1.66 258 kΩ

(1) Operation with VINless than 4.5V or in drop-out may result in reduced performance.

ELECTRICAL CHARACTERISTICS

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

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

INPUT

UVLO Undervoltage lock-out Exit VIN: 0V → 4V Update based on sim/char 3.15 3.3 3.45 V V

HYS_UVLO

IN-DT

HYS-INDT

DGL(PG_PWR)

DGL(PG_NO-

PWR)

OVP

DGL(OVP-SET)

HYS-OVP

DGL(OVP-REC)

IN-DPM

IN-USB-CL

Hysteresis on V Input power good detection threshold

is V

+ V

OUT

IN-DT

Hysteresis on V Deglitch time on exiting sleep. 45 ms Deglitch time on V

down. Same as entering sleep. PG = OC, V Input over-voltage protection threshold VIN: 5V → 7V 6.5 6.65 6.8 V Input over-voltage blanking time VIN: 5V → 7V 113 ms Hysteresis on OVP VIN: 7V → 5V 95 mV

Deglitch time exiting OVP 30 ms

USB/Adaptor low input voltage protection. Restricts lout at V

USB input I-Limit 100mA ISET2 = Float; R USB input I-Limit 500mA ISET2 = High; R

ISET SHORT CIRCUIT TEST

ISET_SHORT

DGL_SHORT

OUT_CL

Highest Resistor value considered a Riset: 600Ω → 250Ω, I fault (short). Monitored for Iout>90mA Reset.

Deglitch time transition from ISET short to Iout disable

Maximum OUT current limit Regulation (Clamp)

BATTERY SHORT PROTECTION

OUT(SC)

OUT(SC-HYS)

OUT(SC)

OUT pin short-circuit detection threshold/ precharge threshold

OUT pin Short hysteresis 77 mV Source current to OUT pin during

short-circuit detection

UVLO_RISE

IN-DT

falling 175 227 280 mV

falling V

power Time measured from VIN: 5V → 3.2V 1ms fall-time to

HYS-INDT

IN-DPM

VIN: 4V→0V, V

UVLO_FALL

(Input power good if VIN> V V

OUT OUT

= V

UVLO_RISE–VHYS-UVLO

+ V

= 3.6V, VIN: 3.5V → 4V

OUT

IN-DT

);

30 80 145 mV

= 3.6V, VIN: 4V → 3.5V 31 mV

Time measured from VIN: 0V → 5V 1ms rise-time to PG = low, V

OUT

= 3.6V

29 ms

Time measured from VIN: 7V → 5V 1ms fall-time to PG = LO

Feature active in USB mode; Limit Input Source Current to 50mA; V

OUT

= 3.5V; R

ISET

= 825Ω

Feature active in Adaptor mode; Limit Input Source Current to 50mA; V

= 3.5V; R

OUT

= 825Ω 85 92 100

ISET

= 825Ω 430 462 500

ISET

latches off. Cycle power to

OUT

ISET

= 825Ω

4.34 4.4 4.46

4.24 4.3 4.36

280 500 Ω

Clear fault by cycling IN or TS/BAT_EN 1 ms VIN= 5V, V

600Ω → 250Ω, Iout latches off after t

:3V → 0.5V, no deglitch 0.75 0.8 0.85 V

OUT

Recovery ≥ V Deglitch

OUT

OUT(SC)

= 3.6V, V

+ V

= Low, R

ISET2

OUT(SC-HYS)

ISET

DGL-SHORT

; Rising, no

1.05 1.4 A

10 15 20 mA

Product Folder Link(s): bq24090 bq24091 bq24092 bq24093

bq24090, bq24091 bq24092, bq24093

SLUS968B –JANUARY 2010–REVISED JUNE 2010

ELECTRICAL CHARACTERISTICS (continued)

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

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

QUIESCENT CURRENT

OUT(PDWN)

OUT(DONE)

IN(STDBY)

BATTERY CHARGER FAST-CHARGE

OUT(REG)

O_HT(REG)

OUT(RANGE)

DO(IN-OUT)

OUT

ISET

PRECHARGE – SET BY PRETERM PIN

LOWV

DGL1(LOWV)

DGL2(LOWV)

PRE-TERM

PRECHG

PRE-CHG

TERMINATION – SET BY PRE-TERM PIN

TERM

PRE-TERM

%TERM Termination current formula R t

DGL(TERM)

Term-Start

Battery current into OUT pin VIN= 0V 1 OUT pin current, charging terminated VIN= 6V, V

OUT

> V

OUT(REG)

Standby current into IN pin TS = LO, VIN≤ 6V 125 mA Active supply current, IN pin 0.8 1.0 mA

Battery regulation voltage VIN= 5.5V, I Battery hot regulation Voltage,

bq24092/3 Programmed Output “fast charge”

current range Drop-Out, VIN – VOUT 325 520 mV Output “fast charge” formula V

Fast charge current factor R

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

TS = open, VIN= 6V, TTDM – no load on OUT pin, V

> V

OUT

VIN= 5.5V, I V

OUT(REG)

= 675 to 10.8kΩ

ISET

Adjust VIN down until I R

= 675 , ISET2=Lo (adaptor mode); TJ≤ 100°C

ISET OUT(REG)

= K

ISET

= K

ISET

= K

ISET

OUT(REG)

OUT

> V

OUT

> V

OUT ISET/IOUT ISET/IOUT ISET/IOUT

, IC enabled

= 25mA, (V = 25mA, V

> V

LOWV

OUT

> V

LOWV

; 50 < I ; 25 < I ; 10 < I

≤ VTS≤ V

TS-45°C

TS-60°C

≤ VTS≤ V

TS-0°C

TS-45°C

; VIN= 5V, ISET2=Lo,

= 0.5A, V

OUT

= 4.15V,

; VIN= 5V, ISET2 = Lo K

< 800 mA 510 540 565

OUT

< 50 mA 480 527 580 AΩ

OUT

< 25 mA 350 520 680

OUT

) 4.16 4.2 4.23 V

4.02 4.06 4.1 V

10 1000 mA

ISET/RISET

2.4 2.5 2.6 V

70 ms

32 ms

Refer to the Termination Section

< V

; R

OUT

Pre-charge current, default setting 18 20 22 Pre-charge current formula R

% Pre-charge Factor

Termination Threshold Current, default V setting R

Termination Current Threshold Formula

% Term Factor Ω/%

LOWV

PRE-TERM

< V

OUT

LOWV

= 1080Ω , R

ISET

where %I

FAST-CHG

< V

OUT

LOWV

= 1080Ω, R

ISET

where %I

FAST-CHG

> V

OUT

RCH

PRE-TERM

> V

OUT

RCH

= 750Ω K

ISET

is 10 to 50% V

> V

OUT

RCH

= 750Ω K

TERM

= High Z

= K

= High Z

= K

= 1080Ω; %I

ISET

(Ω/%) × %

PRE-CHG

, VIN= 5V, R

; R

ISET

TERM

, VIN= 5V, R

TERM

, VIN= 5V, R

× %Iset, where %Iset is 5 to 10%

PRE-TERM

= K

PRE-TERM

is 20 to 100%

PRE-TERM

is 10% to 20%

PRE-CHG

PRE-TERM

= K

PRE-CHG

= 1k; %I

(Ω/%) × %TERM (%) R

PRE-TERM

× %I

FAST-CHG

PRE-TERM

(%) R

PRE-CHG

= 2k to 10kΩ;

× %I

FAST-CHG

= 1k to 2kΩ;

× %I

FAST-CHG

= 2k to 10kΩ ;

, where %I

FAST-CHG

= 1k to 2kΩ ; R

PRE-TERM/KPRE-CHG%

, 90 100 110 Ω/%

, 84 100 117 Ω/%

9 10 11

/ K

PRE-TERM

TERM

182 200 216

ISET

174 199 224

Current for programming the term. and pre-chg with resistor. I initial PRE-TERM current.

Term-Start

is the R

PRE-TERM

= 2k, V

= 4.15V 71 75 81 mA

OUT

/ K

TERM

Deglitch time, termination detected 29 ms Elevated PRE-TERM current for,

, during start of charge to 80 85 92 mA

Term-Start

prevent recharge of full battery, Elevated termination threshold initially

active for t

Term-Start

1.25 min

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OUT-

Product Folder Link(s): bq24090 bq24091 bq24092 bq24093

bq24090, bq24091 bq24092, bq24093

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ELECTRICAL CHARACTERISTICS (continued)

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

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

RECHARGE OR REFRESH

Recharge detection threshold – V

RCH

Normal Temp -0.120 0.070 Recharge detection threshold – Hot V

Temp -0.130 0.080

DGL1(RCH)

DGL2(RCH)

Deglitch time, recharge threshold VIN= 5V, VTS= 0.5V, V detected t

Deglitch time, recharge threshold VIN= 5V, VTS= 0.5V, V detected in OUT-Detect Mode is time to ISET ramp

BATTERY DETECT ROUTINE

REG-BD

BD-SINK

DGL(HI/LOW

REG)

BD-HI

BD-LO

VOUT Reduced regulation during V battery detect -0.450 350

Sink current during V Regulation time at V

REG-BD

REG

or V

REG-BD

High battery detection threshold VIN= 5V, VTS= 0.5V, Battery Absent V

Low battery detection threshold VIN= 5V, VTS= 0.5V, Battery Absent V

BATTERY CHARGING TIMERS AND FAULT TIMERS

PRECHG

MAXCH

Pre-charge safety timer value 1700 1940 2250 s

Charge safety timer value 34000 38800 45000 s

BATTERY-PACK NTC MONITOR (Note 1); TS pin: 10k and 100k NTC

NTC-10k

NTC-100k

NTC-DIS-10k

NTC-DIS-100k

NTC bias current, bq24090/2 VTS= 0.3V 48 50 52 mA NTC bias current, bq24091/3 VTS= 0.3V 4.8 5.0 5.2 mA 10k NTC bias current when Charging

is disabled, bq24090/2 10k NTC bias current when Charging

is disabled, bq24091/3 INTC is reduced prior to entering

NTC-FLDBK-10k

TTDM to keep cold thermistor from VTS: Set to 1.525V 4 5 6.5 mA entering TTDM, bq24090/2

INTC is reduced prior to entering

NTC-FLDBK-100k

TTDM(TS)

HYS-TTDM(TS)

CLAMP(TS)

DGL(TTDM)

TS_I-FLDBK

TS-0°C

HYS-0°C

TS-10°C

HYS-10°C

TS-45°C

HYS-45°C

TTDM to keep cold thermistor from VTS: Set to 1.525V 1.1 1.5 1.9 mA entering TTDM, bq24091/3

Termination and timer disable mode Threshold – Enter

Hysteresis exiting TTDM VTS: 1.7V → 0.5V; Timer Enabled 100 mV TS maximum voltage clamp VTS= Open (Float) 1800 1950 2000 mV Deglitch exit TTDM between states 57 ms Deglitch enter TTDM between states 8 ms

TS voltage where INTC is reduce to keep thermistor from entering TTDM

Optional Capacitance – ESD 0.22 mF Low temperature CHG Pending 1205 1230 1255 mV

Hysteresis at 0°C 86 mV Low temperature, half charge, Normal charging to low temp charging;

bq24092/3 VTS: 0.5V → 1V Hysteresis at 10°C, bq24092/3 35 mV

High temperature at 4.1V 263 278 293 mV

Hysteresis at 45°C 10.7 mV

VIN= 5V, VTS= 0.5V, V

VIN= 5V, VTS= 0.2V, V

is time to ISET ramp

DGL(RCH)

: 4.25V → V

OUT

: 4.15V → V

OUT

: 4.25V → 3.5V in 1ms;

OUT

= 3.5V inserted; t

OUT

RCH

VIN= 5V, VTS= 0.5V, Battery Absent 7 10 mA

Restarts when entering Pre-charge; Always enabled when in pre-charge.

Clears fault or resets at UVLO, TS/BAT_EN disable, OUT Short, exiting LOWV and Refresh

VTS= 0V 27 30 34 mA

VTS= 0V 4.4 5.0 5.8 mA

VTS: 0.5V → 1.7V; Timer Held in Reset 1550 1600 1650 mV

INTC adjustment (90 to 10%; 45 to 6.6uS) takes place near this spec threshold. VTS: 1.425V → 1475 mV

1.525V

Low Temp Charging to Pending; VTS: 1.0V → 1.5V

Charge pending to low temp charging; VTS: 1.5V → 1V

Low temp charging to normal CHG; VTS: 1.0V → 0.5V

Normal charging to high temp CHG; VTS: 0.5V → 0.2V

High temp charging to normal CHG; VTS: 0.2V → 0.5V

SLUS968B –JANUARY 2010–REVISED JUNE 2010

O(REG)

-0.095 V

O(REG)

-0.105 V

O(REG)

29 ms

DGL(RCH)

O(REG)

3.6 ms

-0.400 V

O(REG)

25 ms

O(REG)

-0.150 0.050

REG-BD

+0.50 +0.15

-0.100 V

O(REG)

+0.1 V

REG-BD

765 790 815 mV

O(REG)

REG-BD

Product Folder Link(s): bq24090 bq24091 bq24092 bq24093

bq24090, bq24091 bq24092, bq24093

SLUS968B –JANUARY 2010–REVISED JUNE 2010

ELECTRICAL CHARACTERISTICS (continued)

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

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

TS-60°C

HYS-60°C

DGL(TS_10C)

DGL(TS)

TS-EN-10k

TS-DIS_HYS-10k

TS-EN-100k

TS-DIS_HYS-

100k

High temperature Disable, bq24092/3 170 178 186 mV

Hysteresis at 60°C, bq24092/3 11.5 mV

Deglitch for TS thresholds: 10C, bq24092/3

Deglitch for TS thresholds: 0/45/60C. Battery charging 30 ms Charge Enable Threshold, (10k NTC) VTS: 0V → 0.175V; 80 88 96 mV HYS below V

NTC)

TS-EN-10k

Charge Enable Threshold, bq24090/2 VTS: 0V → 0.175V; 140 150 160 mV HYS below V

bq24091/3

TS-EN-100k

THERMAL REGULATION

J(REG)

J(OFF)

J(OFF-HYS)

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

LOGIC LEVELS ON ISET2

FLT

Logic LOW input voltage Sink 8 mA 0.4 V Logic HIGH input voltage Source 8 mA 1.4 V Sink current required for LO V Source current required for HI V ISET2 Float Voltage 575 900 1225 mV

LOGIC LEVELS ON CHG AND PG

V I

LEAK

Output LOW voltage I Leakage current into IC V

to Disable, (10k

to Disable,

High temp charge to pending; VTS: 0.2V → 0.1V

Charge pending to high temp CHG; VTS: 0.1V → 0.2V

Normal to Cold Operation; VTS: 0.6V → 1V 50 Cold to Normal Operation; VTS: 1V → 0.6V 12

VTS: 0.125V → 0V; 12 mV

VTS: 0.125V → 0V; 50 mV

= 0.4V 2 9 mA

ISET2

= 1.4V 1.1 8 mA

ISET2

= 5 mA 0.4 V

SINK

= 5V, VPG= 5V 1 mA

CHG

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Product Folder Link(s): bq24090 bq24091 bq24092 bq24093

ISET

VSS

PRETERM

ISET2

CHG

OUT

bq2409x

bq24090, bq24091 bq24092, bq24093

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PIN CONFIGURATION

PIN FUNCTIONS

NAME PIN I/O DESCRIPTION

IN 1 I

OUT 10 O battery to charge within the 10 hour safety timer window. Expected range of bypass capacitors 1mF to

PRE-TERM 4 I

ISET 2 I

ISET2 7 I

TS 9 I Mode and disable TS monitoring, Timers and Termination. Pulling pin Low disables the IC. If NTC

VSS 3 – Ground terminal CHG 8 O Low (FET on) indicates charging and Open Drain (FET off) indicates no Charging or Charge complete. PG 5 O Low (FET on) indicates the input voltage is above UVLO and the OUT (battery) voltage. NC 6 NA Do not make a connection to this pin (for internal use) – Do not route through this pin

Thermal PAD Pad device. The thermal pad must be connected to the same potential as the VSS pin on the printed circuit and Package 5x3mm

Input power, connected to external DC supply (AC adapter or USB port). Expected range of bypass capacitors 1mF to 10mF, connect from IN to VSS.

Battery Connection. System Load may be connected. Average load should not be excessive, allowing 10mF.

Programs the Current Termination Threshold (5 to 50% of Iout which is set by ISET) and Sets the Pre-Charge Current to twice the Termination Current Level.

Expected range of programming resistor is 1k to 10kΩ (2k: Ipgm/10 for term; Ipgm/5 for precharge) Programs the Fast-charge current setting. External resistor from ISET to VSS defines fast charge current

value. Range is 10.8k (50mA) to 675 Ω (800mA). Programming the Input/Output Current Limit for the USB or Adaptor source:

High = 500mAmax, Low = ISET, FLOAT = 100mAmax. Temperature sense pin connected to bq24090/2 -10k at 25°C NTC thermistor & bq24091/3 -100k at

25°C NTC thermistor, in the battery pack. Floating TS Pin or pulling High puts part in TTDM “Charger” sensing is not needed, connect this pin to VSS through an external 10 kΩ/100kΩ resistor. A 250kΩ from

TS to ground will prevent IC entering TTDM mode when battery with thermistor is removed.

There is an internal electrical connection between the exposed thermal pad and the VSS pin of the

–

board. Do not use the thermal pad as the primary ground input for the device. VSS pin must be connected to ground at all times

SLUS968B –JANUARY 2010–REVISED JUNE 2010

Product Folder Link(s): bq24090 bq24091 bq24092 bq24093

BatteryPack

VBUS

GND

D+

D-

USBPort

DC+

GND

Adaptor

VDD

D-

D+

GND

Host

SystemLoad

ISET/100/500 mA

ISET

VSS

PRETERM

ISET2

CHG

OUT

bq2409x

1 Fm

1kW

1.5kW

2kW

DisconnectafterDetection

TTDM

bq24090, bq24091 bq24092, bq24093

SLUS968B –JANUARY 2010–REVISED JUNE 2010

Typical Application Circuit: bq2409x

OUT_FAST_CHG

= 540mA; I

OUT_PRE_CHG

= 108mA; I

OUT_TERM

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= 54mA

Product Folder Link(s): bq24090 bq24091 bq24092 bq24093

OUT

Charge

Pump

IN OUT

OUTREG

REF

TJ°C

125°C

REF

ISET

Charge

Pump

PRE-TERM

75mA

CHARGE

CONTROL

OUT

TERM_EN

ISET2 (LO=ISET,HI=USB500,

FLOAT =USB100)

COLD-FLT

HOT-45 C

TTDM

5 Am 45 Am

CLAMP

= 1.4V

ColdTemperature

SinkCurrent

=45 Am

LO =TTDMMODE

HI=CHIP DISABLE

OUT

CHG

ON:

OnDuring

1stChargeOnly

OFF:

Increasedfrom 75 A to85 A form m

1stminuteofcharge.

+ _

InternalCharge

CurrentSense

w/ MultipleOutputs

USBSense

Resistor

USB100/500

REF

+ _

1.5V

FASTCHARGE

PRE-CHARGE

HI =SuspendCHG

COLD-10 C

HOT-FLT

HI =HalfCHG(JEITA)

HI =4.06Vreg(JEITA)

DISABLE

+ _

80 mV

Input Power Detect

+ _

IN-DPM

REF

0.9VFloat

TS - bq24090

+ _

Disable

SinkCurrent

=20 Am

Bq24090 isasshown

X2Gain(1:2) Term:Pre-CHGX2

TermReference

Pre-CHGReference

I x1.5V

540 A

OUT

T C

150 C ThermalShutdown

REF

OVP

REF

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FUNCTIONAL BLOCK DIAGRAM

bq24090, bq24091 bq24092, bq24093

SLUS968B –JANUARY 2010–REVISED JUNE 2010

Product Folder Link(s): bq24090 bq24091 bq24092 bq24093

Vin

Viset

Vchg

Vpg

t-time-20ms/div

2V/div

5V/div

2V/div

Vin

Viset

Vchg

Vpg

t-time-100ms/div

2V/div

5V/div

Vts

Viset

Vchg

Vpg

t-time-50ms/div

2V/div

500mV/div

Vin

Vchg

Vpg

Vout

BatteryDetectMode

t-time-20ms/div

2V/div

5V/div

2V/div

Vin

Viset

Vts

Vout

t-time-5ms/div

2V/div

1V/div

500mV/div

Viset

Vchg

Vts

Vout

1BatteryDetectCycle

Entered TTDM

t-time-10ms/div

5V/div

1V/div

bq24090, bq24091 bq24092, bq24093

SLUS968B –JANUARY 2010–REVISED JUNE 2010

TYPICAL OPERATIONAL CHARACTERISTICS

SETUP: bq2409x typical applications schematic; VIN= 5V, V

POWER UP, DOWN, OVP, DISABLE AND ENABLE WAVEFORMS

BAT

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= 3.6V (unless otherwise indicated)

Figure 1. OVP 8V Adaptor - Hot Plug Figure 2. OVP from Normal Power-up

Operation – VIN0V → 5V → 6.8V →5V

10kΩ resistor from TS to GND. 10kΩ is shorted to disable the IC. Fixed 10kΩ resistor, between TS and GND.

Figure 3. TS Enable and Disable Figure 4. Hot Plug Source w/No Battery – Battery

Detection

Figure 5. Battery Removal – GND Removed 1st, 42 Ω Load Figure 6. Battery Removal with OUT and

TS Disconnect 1st, With 100 Ω Load

Continuous battery detection when not in TTDM.

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Viset

Vchg

V_0.1 _OUTW

Vout

BatteryDeclared Absent

t-time-20ms/div

100mV/div

1V/div

5V/div

Viset

Vchg

Vout

V_0.1 _OUTW

Battery

Threshold

Reached

t-time-500ms/div

1V/div

5V/div

1V/div

100mV/div

Viset

Vchg

Vout

V_0.1 _OUTW

I ClampedCurrent

OUT

I ShortDetected

andLatchedOff

SET

t-time-200 s/divm

1V/div

2V/div

500mV/div

100mV/div

Vin

Viset

Vchg

V_0.1 _OUTW

t-time-1ms/div

2V/div

20mV/div

500mV/div

Vin

Viset

Vchg

V_0.1 _OUTW

ShortDetectedin100mA

modeandLatchedOff

t-time-5ms/div

2V/div

500mV/div

20mV/div

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TYPICAL OPERATIONAL CHARACTERISTICS (continued)

SETUP: bq2409x typical applications schematic; VIN= 5V, V

Figure 7. Battery Removal with fixed TS = 0.5V

PROTECTION CIRCUITS WAVEFORMS

CH4: Iout (1A/Div) Battery voltage swept from 0V to 4.25V to 3.9V.

CH4: Iout (1A/Div)

SLUS968B –JANUARY 2010–REVISED JUNE 2010

= 3.6V (unless otherwise indicated)

BAT

bq24090, bq24091 bq24092, bq24093

Figure 8. Battery Charge Profile Figure 9. ISET Shorted During Normal Operation

CH4: Iout (0.2A/Div) CH4: Iout (0.2A/Div)

Figure 10. ISET Shorted Prior to USB Power-up Figure 11. DPM – Adaptor Current Limits – Vin Regulated

The IC temperature rises to 125°C and enters thermal regulation. Charge current is reduced to regulate the IC at 125°C. VIN is reduced, the IC temperature drops, the charge current returns to the programmed value.

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Vin

Viset

Vchg

V_0.1 _OUTW

t-time-500 s/divm

2V/div

500mV/div

20mV/div

Viset

Vout

Vin

V_0.1 _OUTW

Exits

Thermal

Regulation

Enters Thermal Regulation

t-time-1s/div

2V/div

1V/div

50mV/div

Vin

Viset

Vchg

Vpg

t-time-20ms/div

5V/div

1V/div

528

530

532

534

536

538

540

542

544

546

0 0.2 0.4 0.6 0.8

I -OutputCurrent- A

Kiset

Kiset- W

.15

LowtoHighCurrents (mayoccurinrechargetofastchargetransion)

HightoLowCurrents (mayoccurinVoltageRegulation- TaperCurrent)

4.196

4.198

4.2

4.202

4.204

4.206

4.208

4.21

4.212

4.5 5 5.5 6 6.5

R 100

OUT =

V @25°C

V @85°C

V -InputVoltageDC-V

V -OutputVoltageDC-V

OUT

V @0°C

4.192

4.193

4.194

4.195

4.196

4.197

4.198

4.199

4.2

0 0.2 0.4 0.6 0.8 1

I -Outputcurrent- A

V @0°C

reg

V -OutputVoltage-V

OUT

V @25°C

reg

V @85°C

reg

bq24090, bq24091 bq24092, bq24093

SLUS968B –JANUARY 2010–REVISED JUNE 2010

TYPICAL OPERATIONAL CHARACTERISTICS (continued)

SETUP: bq2409x typical applications schematic; VIN= 5V, V

= 3.6V (unless otherwise indicated)

BAT

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Figure 12. DPM – USB Current Limits – Vin Regulated to Figure 13. Thermal Reg. – Vin increases PWR/Iout

4.4V Reduced

VINswept from 5V to 3.9V to 5V, V

Figure 14. Entering and Exiting Sleep Mode Figure 15. K

BAT

= 4V

for Low and High Currents

ISET

Figure 16. Line Regulation Figure 17. Load Regulation Over Temperature

Product Folder Link(s): bq24090 bq24091 bq24092 bq24093

361.8

362

362.2

362.4

362.6

362.8

363

363.2

363.4

2.5 3 3.5 4 4.5

V -OutputVoltage-V

I @0°C

I @85°C

I @25°C

I -OutputCurrent-mA

bq24090, bq24091 bq24092, bq24093

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TYPICAL OPERATIONAL CHARACTERISTICS (continued)

SETUP: bq2409x typical applications schematic; VIN= 5V, V

Figure 18. Current Regulation Over Temperature

= 3.6V (unless otherwise indicated)

BAT

FUNCTIONAL GENERAL DESCRIPTION

The bq2409x is a highly integrated family of 5x3mm2single cell Li-Ion chargers. The charger can be used to charge a battery, power a system or both. The charger has three phases of charging: Pre-charge to recover a fully discharged battery, fast-charge constant current to supply the buck charge safely and voltage regulation to safely reach full capacity. The charger is very flexible, allowing programming of the fast-charge current and Pre-charge/Termination Current. This charger is designed to work with a USB connection or Adaptor (DC out). The charger also checks to see if a battery is present.

The charger also comes with a full set of safety features: JEITA Temperature Standard, Over-Voltage Protection, DPM-IN, Safety Timers, and ISET short protection. All of these features and more are described in detail below.

The charger is designed for a single power path from the input to the output to charge a single cell Li-Ion battery pack. Upon application of a 5VDC power source the ISET and OUT short checks are performed to assure a proper charge cycle.

If the battery voltage is below the LOWV threshold, the battery is considered discharged and a preconditioning cycle begins. The amount of precharge current can be programmed using the PRE-TERM pin which programs a percent of fast charge current (10 to 100%) as the precharge current. This feature is useful when the system load is connected across the battery “stealing” the battery current. The precharge current can be set higher to account for the system loading while allowing the battery to be properly conditioned. The PRE-TERM pin is a dual function pin which sets the precharge current level and the termination threshold level. The termination "current threshold" is always half of the precharge programmed current level.

Once the battery voltage has charged to the V is applied. The fast charge constant current is programmed using the ISET pin. The constant current provides the bulk of the charge. Power dissipation in the IC is greatest in fast charge with a lower battery voltage. If the IC reaches 125°C the IC enters thermal regulation, slows the timer clock by half and reduce the charge current as needed to keep the temperature from rising any further. Figure 19 shows the charging profile with thermal regulation. Typically under normal operating conditions, the IC’s junction temperature is less than 125°C and thermal regulation is not entered.

Once the cell has charged to the regulation voltage the voltage loop takes control and holds the battery at the regulation voltage until the current tapers to the termination threshold. The termination can be disabled if desired. The CHG pin is low (LED on) during the first charge cycle only and turns off once the termination threshold is reached, regardless if termination, for charge current, is enabled or disabled.

Further details are mentioned in the Operating Modes section.

threshold, fast charge is initiated and the fast charge current

LOWV

SLUS968B –JANUARY 2010–REVISED JUNE 2010

Product Folder Link(s): bq24090 bq24091 bq24092 bq24093

PRE-CHARGE

CURRENT AND

TERMINATION

THRESHOLD

FAST-CHARGE

CURRENT

(PRECHG)

Charge

Complete

Status,

Charger

Off

Pre-

Conditioning

Phase

Current

Regulation

Phase

VoltageRegulationand

ChargeTermination

Phase

Battery

Voltage,

(OUT)

BatteryCurrent,

(OUT)

DONE

Thermal

Regulation

Phase

Temperature, Tj

O(OUT)

(THREG)

(TERM)

O(PRECHG)

O(REG)

O(LOWV)

DONE

(CHG)

bq24090, bq24091 bq24092, bq24093

SLUS968B –JANUARY 2010–REVISED JUNE 2010

FUNCTIONAL GENERAL DESCRIPTION (continued)

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Figure 19. Charging Profile With Thermal Regulation

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DETAILED FUNCTIONAL DESCRIPTION

Power-Down or Undervoltage Lockout (UVLO)

The bq2409x family is in power down mode if the IN pin voltage is less than UVLO. The part is considered “dead” and all the pins are high impedance. Once the IN voltage rises above the UVLO threshold the IC will enter Sleep Mode or Active mode depending on the OUT pin (battery) voltage.

Under Voltage Lockout (UVLO):

The bq2409x family is in power down mode if the IN pin voltage is less than V and all the pins are high impedance.

Power-up

The IC is alive after the IN voltage ramps above UVLO (see sleep mode), resets all logic and timers, and starts to perform many of the continuous monitoring routines. Typically the input voltage quickly rises through the UVLO and sleep states where the IC declares power good, starts the qualification charge at 100mA, sets the input current limit threshold base on the ISET2 pin, starts the safety timer and enables the CHG pin. See

Figure 20.

Sleep Mode

If the IN pin voltage is between than V

OUT+VDT

counting stops (not reset) and the PG and CHG pins are high impedance. As the input voltage rises and the charger exits sleep mode, the PG pin goes low, the safety timer continues to count, charge is enabled and the CHG pin returns to its previous state. See Figure 21

and UVLO, the charge current is disabled, the safety timer

SLUS968B –JANUARY 2010–REVISED JUNE 2010

. The part is considered “dead”

UVLO

New Charge Cycle

A new charge cycle is started when a good power source is applied, performing a chip disable/enable (TS pin), exiting Termination and Timer Disable Mode (TTDM), detecting a battery insertion or the OUT voltage dropping below the V a dropping below V

threshold. The CHG pin is active low only during the first charge cycle, therefore exiting TTDM or

RCH

will not turn on the CHG pin FET, if the CHG pin is already high impedance.

RCH

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LDO

1.8V

LDO

HYS

0°C

HYS

10°C

HYS

45°C

HYS

60°C

HYS

DIS

HYS

DGL(TS)

DGL(TS_IOC)

Rising

DGL(TS_IOC)

Falling

DGL(TS)

DGL(TTDM)

Exit

DGL(TTDM)

Enter

t<t

DGL(TTDM)

Exit

t<t

DGL(IS)

Normal

Operation

LDO

Mode

Normal

Operation

Cold

Operation

Cold

Fault

LDO

Mode

Cold

Fault

Normal

Operation

DGL(TS)

DGL(TTDM)

Enter

Disabled

Cold

Operation

HOT

Fault

4.06V

HOT

Operation

Normal

Operation

4.06V

HOT

Operation

Disabled

DGL(TS1_IOC)

ColdtoNormal

DrawingNottoScale

DotsShow Threshold TripPoints

fllowedbyadeglitchtimebefore

transitioningintoanewmode.

bq24090, bq24091 bq24092, bq24093

SLUS968B –JANUARY 2010–REVISED JUNE 2010

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Figure 20. TS Battery Temperature Bias Threshold and Deglitch Timers

Product Folder Link(s): bq24090 bq24091 bq24092 bq24093

ApplyInput

Power

SetInputCurrentLimitto 100 mA

andStartCharge

PerformISET & OUT shorttests

RememberISET2 State

Setchargecurrent

basedonISET2 truth

table.

Returnto

Charge

Ispowergood?

BAT+VDT

< VIN< V

OVP

& V

UVLO

< V

Yes

Ischipenabled?

VTS> V

Yes

TurnonPGFET

PGpinLOW

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bq24090, bq24091 bq24092, bq24093

SLUS968B –JANUARY 2010–REVISED JUNE 2010

Overvoltage-Protection (OVP) – Continuously Monitored

If the input source applies an overvoltage, the pass FET, if previously on, turns off after a deglitch, t timer ends and the CHG and PG pin goes to a high impedance state. Once the overvoltage returns to a normal voltage, the PG pin goes low, timer continues, charge continues and the CHG pin goes low after a 25ms deglitch. PG pin is optional on some packages

Figure 21. bq2409x Power-Up Flow Diagram

BLK(OVP)

. The

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SLUS968B –JANUARY 2010–REVISED JUNE 2010

Power Good Indication (PG)

After application of a 5V source, the input voltage rises above the UVLO and sleep thresholds (VIN>V but is less than OVP (VIN<V

,), then the PG FET turns on and provides a low impedance path to ground. See

OVP

Figure 1, Figure 2, and Figure 14.

CHG Pin Indication

The charge pin has an internal open drain FET which is on (pulls down to VSS) during the first charge only (independent of TTDM) and is turned off once the battery reaches voltage regulation and the charge current tapers to the termination threshold set by the PRE-TERM resistor.

The charge pin is high impedance in sleep mode and OVP (if PG is high impedance) and return to its previous state once the condition is removed.

Cycling input power, pulling the TS pin low and releasing or entering pre-charge mode causes the CHG pin to go reset (go low if power is good and a discharged battery is attached) and is considered the start of a first charge.

CHG and PG LED Pull-up Source

For host monitoring, a pull-up resistor is used between the "STATUS" pin and the VCCof the host and for a visual indication a resistor in series with an LED is connected between the "STATUS" pin and a power source. If the CHG or PG source is capable of exceeding 7V, a 6.2V Zener should be used to clamp the voltage. If the source is the OUT pin, note that as the battery changes voltage, the brightness of the LEDs vary.

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BAT+VDT

Charging State CHG FET/LED

1st Charge ON

Refresh Charge

OVP OFF

SLEEP

TEMP FAULT ON for 1st Charge

VINPower Good State PG FET/LED

UVLO

SLEEP Mode OFF

OVP Mode

IN-DPM (V

IN-DPM

Normal Input (V

or IN–DPM)

+ VDT< VIN<

OUT

)

OUP

PG is independent of chip disable

The IN-DPM feature is used to detect an input source voltage that is folding back (voltage dropping), reaching its current limit due to excessive load. When the input voltage drops to the V

threshold the internal pass FET

IN-DPM

starts to reduce the current until there is no further drop in voltage at the input. This would prevent a source with voltage less than V

to power the out pin. This works well with current limited adaptors and USB ports as

IN-DPM

long as the nominal voltage is above 4.3V and 4.4V respectively. This is an added safety feature that helps protect the source from excessive loads.

OUT

The Charger’s OUT pin provides current to the battery and to the system, if present. This IC can be used to charge the battery plus power the system, charge just the battery or just power the system (TTDM) assuming the loads do not exceed the available current. The OUT pin is a current limited source and is inherently protected against shorts. If the system load ever exceeds the output programmed current threshold, the output will be discharged unless there is sufficient capacitance or a charged battery present to supplement the excessive load.

Product Folder Link(s): bq24090 bq24091 bq24092 bq24093

0.5

1.5

2.5

3.5

4.5

0.6

1.8

V -Voltage-V

NormalizedOUTCurrentandV -V

REG

60 Cto45 C

HOT TEMP

4.06V

Regulation

o o

OUT

0.2

0.4

0.8

1.2

1.4

1.6

For<45 C,4.2VRegulation

} HotFault

NoOperation

DuringCold

Fault

Cold

Fault

ICDisable}

0 C

< 48 C

60 C

10 C

100%ofProgrammed

Current

50%

Termination

Disable

bq24090, bq24091 bq24092, bq24093

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ISET

An external resistor is used to Program the Output Current (50 to 800mA) and can be used as a current monitor.

= K

ISET

÷ I

OUT

Where:

is the desired fast charge current;

OUT

is a gain factor found in the electrical specification

ISET

For greater accuracy at lower currents, part of the sense FET is disabled to give better resolution. Figure 15 shows the transition from low current to higher current. Going from higher currents to low currents, there is hysteresis and the transition occurs around 0.15A.

The ISET resistor is short protected and will detect a resistance lower than ≉340Ω. The detection requires at least 80mA of output current. If a “short” is detected, then the IC will latch off and can only be reset by cycling the power. The OUT current is internally clamped to a maximum current between 1.1A and 1.35A and is independent of the ISET short detection circuitry, as shown in Figure 23. Also, see Figure 9 and Figure 10.

(1) (1)

SLUS968B –JANUARY 2010–REVISED JUNE 2010

Figure 22. Operation Over TS Bias Voltage

Product Folder Link(s): bq24090 bq24091 bq24092 bq24093

0.2

0.4

0.6

0.8

1.2

1.4

1.6

1.8

100

1000

10 000

I -

SET

I -OutputCurrent- A

I InternalClampRange

OUT

I Short

Fault

Range

SET

NonRestricted Operating Area

I Programmed

OUT

min

max

I Clampmin-max

OUT

I Faultmin-max

OUT

Drive

Logic

ISET2

ToISET2

Drive Logic

R1Divider setto0.9V Whichisthe FloatVoltage

bq24090, bq24091 bq24092, bq24093

SLUS968B –JANUARY 2010–REVISED JUNE 2010

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Figure 23. Programmed/Clamped Out Current

PRE_TERM – Pre-Charge and Termination Programmable Threshold

Pre-Term is used to program both the pre-charge current and the termination current threshold. The pre-charge current level is a factor of two higher than the termination current level. The termination can be set between 5% and 50% of the programmed output current level set by ISET. If left floating the termination and pre-charge are set internally at 10/20% respectively. The pre-charge-to-fast-charge, V

PRE-TERM

= %Term × K

= %Pre-CHG × K

TERM

PRE-CHG

threshold is set to 2.5V.

lowv

(2) (2)

Where:

%Term is the percent of fast charge current where termination occurs; %Pre-CHG is the percent of fast charge current that is desired during precharge; K

TERM

and K

PRE-CHG

are gain factors found in the electrical specifications.

ISET2

Is a 3-state input and programs the Input Current Limit/Regulation Threshold. A low will program a regulated fast charge current via the ISET resistor and is the maximum allowed input/output current for any ISET2 setting, Float will program a 100mA Current limit and High will program a 500mA Current limit.

Below are two configurations for driving the 3-state ISET2 pin:

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The TS pin is designed to follow the new JEITA temperature standard for Li-Ion batteries. There are now four thresholds, 60°C, 45°C, 10°C, and 0°C. Normal operation occurs between 10°C and 45°C. If between 0°C and 10°C the charge current level is cut in half and if between 45°C and 60°C the regulation voltage is reduced to

4.1Vmax, see Figure 22. The TS feature is implemented using an internal 50mA current source to bias the thermistor (designed for use with a 10k NTC b = 3370 (SEMITEC 103AT-2 or Mitsubishi TH05-3H103F) connected from the TS pin to VSS. If this feature is not needed, a fixed 10k can be placed between TS and VSSto allow normal operation. This may be done if the host is monitoring the thermistor and then the host would determine when to pull the TS pin low to disable charge.

The TS pin has two additional features, when the TS pin is pulled low or floated/driven high. A low disables charge (similar to a high on the BAT_EN feature) and a high puts the charger in TTDM.

Above 60°C or below 0°C the charge is disabled. Once the thermistor reaches ≈–10°C the TS current folds back to keep a cold thermistor (between –10°C and –50°C) from placing the IC in the TTDM mode. If the TS pin is pulled low into disable mode, the current is reduced to ≈30mA, see Figure 20. Since the ITScurrent is fixed along with the temperature thresholds, it is not possible to use thermistor values other than the 10k NTC (at 25°C).

For non-JEITA spins, the operating range is between 0°C and 45°C.

Termination and Timer Disable Mode (TTDM) -TS pin high

The battery charger is in TTDM when the TS pin goes high from removing the thermistor (removing battery pack/floating the TS pin) or by pulling the TS pin up to the TTDM threshold.

When entering TTDM, the 10 hour safety timer is held in reset and termination is disabled. A battery detect routine is run to see if the battery was removed or not. If the battery was removed then the CHG pin will go to its high impedance state if not already there. If a battery is detected the CHG pin does not change states until the current tapers to the termination threshold, where the CHG pin goes to its high impedance state if not already there (the regulated output will remain on).

The charging profile does not change (still has pre-charge, fast-charge constant current and constant voltage modes). This implies the battery is still charged safely and the current is allowed to taper to zero.

When coming out of TTDM, the battery detect routine is run and if a battery is detected, then a new charge cycle begins and the CHG LED turns on.

SLUS968B –JANUARY 2010–REVISED JUNE 2010

If TTDM is not desired upon removing the battery with the thermistor, one can add a 237k resistor between TS and VSSto disable TTDM. This keeps the current source from driving the TS pin into TTDM. This creates ≈0.1°C error at hot and a ≈3°C error at cold.

Timers

The pre-charge timer is set to 30 minutes. The pre-charge current, can be programmed to off-set any system load, making sure that the 30 minutes is adequate.

The fast charge timer is fixed at 10 hours and can be increased real time by going into thermal regulation, IN-DPM or if in USB current limit. The timer clock slows by a factor of 2, resulting in a clock than counts half as fast when in these modes. If either the 30 minute or ten hour timer times out, the charging is terminated and the CHG pin goes high impedance if not already in that state. The timer is reset by disabling the IC, cycling power or going into and out of TTDM.

Termination

Once the OUT pin goes above VRCH, (reaches voltage regulation) and the current tapers down to the termination threshold, the CHG pin goes high impedance and a battery detect route is run to determine if the battery was removed or the battery is full. If the battery is present, the charge current will terminate. If the battery was removed along with the thermistor, then the TS pin is driven high and the charge enters TTDM. If the battery was removed and the TS pin is held in the active region, then the battery detect routine will continue until a battery is inserted.

Product Folder Link(s): bq24090 bq24091 bq24092 bq24093

bq24090, bq24091 bq24092, bq24093

SLUS968B –JANUARY 2010–REVISED JUNE 2010

Battery Detect Routine

The battery detect routine should check for a missing battery while keeping the OUT pin at a useable voltage. Whenever the battery is missing the CHG pin should be high impedance.

The battery detect routine is run when entering and exiting TTDM to verify if battery is present, or run all the time if battery is missing and not in TTDM. On power-up, if battery voltage is greater than V

threshold, a battery

RCH

detect routine is run to determine if a battery is present. The battery detect routine is disabled while the IC is in TTDM, or has a TS fault. See Figure 24 for the Battery

Detect Flow Diagram.

Refresh Threshold

After termination, if the OUT pin voltage drops to V but the CHG pin remains at a high impedance (off).

(100mV below regulation) then a new charge is initiated,

RCH

Starting a Charge on a Full Battery

The termination threshold is raised by ≉14%, for the first minute of a charge cycle so if a full battery is removed and reinserted or a new charge cycle is initiated, that the new charge terminates (less than 1 minute). Batteries that have relaxed many hours may take several minutes to taper to the termination threshold and terminate charge.

www.ti.com

Product Folder Link(s): bq24090 bq24091 bq24092 bq24093

Start

BATT_DETECT

Start 25mstimer

TimerExpired?

IsVOUT<VREG-100mV?

BatteryPresent

TurnoffSinkCurrent

Returntoflow

SetOUT REG

toVREG-400mV

Enablesinkcurrent

Reset & Start 25mstimer

Yes

TimerExpired?

Yes

IsVOUT>VREG-300mV?

BatteryPresent

TurnoffSinkCurrent

Returntoflow

Yes

Battery Absent Don’tSignalCharge TurnoffSinkCurrent

ReturntoFlow

www.ti.com

bq24090, bq24091 bq24092, bq24093

SLUS968B –JANUARY 2010–REVISED JUNE 2010

Figure 24. Battery Detect Routine

Product Folder Link(s): bq24090 bq24091 bq24092 bq24093

BatteryPack

VBUS

GND

D+

D-

USBPort

DC+

GND

Adaptor

VDD

D-

D+

GND

TTDM

Host

SystemLoad

ISET/100/500 mA

ISET

VSS

PRETERM

ISET2

CHG

OUT

bq24090

1 Fm

1kW

1.5kW

2kW

bq24090, bq24091 bq24092, bq24093

SLUS968B –JANUARY 2010–REVISED JUNE 2010

bq24090 CHARGER APPLICATION DESIGN EXAMPLE

www.ti.com

Requirements

• Supply voltage = 5 V

• Fast charge current: I

• Termination Current Threshold: %

= 540 mA; ISET-pin 2

OUT-FC

IOUT-FC

= 10% of Fast Charge or ~54mA

• Pre-Charge Current by default is twice the termination Current or ~108mA

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

Calculations

Program the Fast Charge Current, ISET:

= [K

ISET

from electrical characteristics table. . . K R

= [540AΩ/0.54A] = 1.0 kΩ

ISET

Selecting the closest standard value, use a 1 kΩ resistor between ISET (pin 16) and VSS.

Program the Termination Current Threshold, ITERM:

PRE-TERM

Selecting the closest standard value, use a 2 kΩ resistor between ITERM (pin 15) and Vss. One can arrive at the same value by using 20% for a pre-charge value (factor of 2 difference). R

PRE-TERM

TS Function

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

/ I

(ISET)

= K

(TERM)

(OUT)

]

× %

IOUT-FC

= 200Ω/% × 10% = 2kΩ

= K

(PRE-CHG)

× %

IOUT-FC

= 100Ω/% × 20%= 2kΩ

= 540AΩ

(SET)

Product Folder Link(s): bq24090 bq24091 bq24092 bq24093

bq24090, bq24091 bq24092, bq24093

www.ti.com

CHG and PG LED Status: connect a 1.5k resistor in series with a LED between the OUT pin and the CHG pin.

Connect a 1.5k resistor in series with a LED between the OUT pin and the and PG pin. Processor Monitoring: Connect a pull-up resistor between the processor’s power rail and the CHG pin.

Connect a pull-up resistor between the processor’s power rail and the PG pin.

SELECTING IN AND OUT PIN CAPACITORS

In most applications, all that is needed is a high-frequency decoupling capacitor (ceramic) on the power pin, input and output 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 for 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 bq2409x family is packaged in a thermally enhanced MSOP 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 VSS pin. Full PCB design guidelines for this package are provided in the application note entitled: Power Pad Thermally Enhanced Package Note (SLMA002). The most common measure of package thermal performance is thermal impedance (qJA) measured (or modeled) from the chip junction to the air surrounding the package surface (ambient). The mathematical expression for qJAis:

= (TJ– T) / P (3) (3)

Where:

TJ= chip junction temperature T = ambient temperature P = device power dissipation

Factors that can influence the measurement and calculation of qJAinclude:

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 verified, 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

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.

(IN)

– V

(OUT)

] × I

(OUT)

+ [V

(OUT)

– V

(BAT)

] × I

(BAT)

SLUS968B –JANUARY 2010–REVISED JUNE 2010

(3)

Product Folder Link(s): bq24090 bq24091 bq24092 bq24093

bq24090, bq24091 bq24092, bq24093

SLUS968B –JANUARY 2010–REVISED JUNE 2010

Leakage Current Effects on Battery Capacity

To determine how fast a leakage current on the battery will discharge the battery is an easy calculation. The time from full to discharge can be calculated by dividing the Amp-Hour Capacity of the battery by the leakage current. For a 0.75AHr battery and a 10mA leakage current (750mAHr/0.010mA = 75000 Hours), it would take 75k hours or 8.8 years to discharge. In reality the self discharge of the cell would be much faster so the 10mA leakage would be considered negligible.

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 bq2409x, 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 bq2409x 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. It is best to use multiple 10mil vias in the power pad of the IC and in close proximity to conduct the heat to the bottom ground plane. The bottom ground place should avoid traces that “cut off” the thermal path. The thinner the PCB the less temperature rise. The EVM PCB has a thickness of 0.031 inches and uses 2 oz. (2.8mil thick) copper on top and bottom, and is a good example of optimal thermal performance.

SPACER

www.ti.com

REVISION HISTORY

Changes from Original (January 2010) to Revision A Page

• Changed V

• Changed I

• Changed V

Changes from Revision A (February 2010) to Revision B Page

• Changed the device number on the front page circuit From: bq24090 To: bq2409x ........................................................... 1

• Changed the ORDERING INFORMATION table Marking column From: Product Preview To: bq24092 and bq24093 ...... 2

DO(IN-OUT)

PRE-TERM

CLAMP(TS)

, MAX value From: 500 mV To: 520 mV in the Elect Characteristics table .......................................... 4

MAX value From: 79 µA to 81µA in the Elect Characteristics table ....................................................... 4

MIN value From: 1900 mV to 1800 mV in the Elect Characteristics table ........................................... 5

Product Folder Link(s): bq24090 bq24091 bq24092 bq24093

PACKAGE OPTION ADDENDUM

www.ti.com

10-Jun-2010

PACKAGING INFORMATION

Orderable Device

BQ24090DGQR ACTIVE MSOP-

BQ24090DGQT ACTIVE MSOP-

BQ24091DGQR ACTIVE MSOP-

BQ24091DGQT ACTIVE MSOP-

BQ24092DGQR ACTIVE MSOP-

BQ24092DGQT ACTIVE MSOP-

BQ24093DGQR ACTIVE MSOP-

BQ24093DGQT ACTIVE MSOP-

(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.

Status

(1)

Package Type Package

PowerPAD

Drawing

Pins Package Qty

DGQ 10 2500 Green (RoHS

DGQ 10 250 Green (RoHS

DGQ 10 2500 Green (RoHS

DGQ 10 250 Green (RoHS

DGQ 10 2500 Green (RoHS

DGQ 10 250 Green (RoHS

DGQ 10 2500 Green (RoHS

DGQ 10 250 Green (RoHS

Eco Plan

& no Sb/Br)

(2)

Lead/

Ball Finish

CU NIPDAU Level-1-260C-UNLIM Purchase Samples

CU NIPDAU Level-1-260C-UNLIM Request Free Samples

CU NIPDAU Level-1-260C-UNLIM Purchase Samples

CU NIPDAU Level-1-260C-UNLIM Request Free Samples

CU NIPDAU Level-1-260C-UNLIM Purchase Samples

CU NIPDAU Level-1-260C-UNLIM Request Free Samples

CU NIPDAU Level-1-260C-UNLIM Purchase Samples

CU NIPDAU Level-1-260C-UNLIM Request Free Samples

MSL Peak Temp

(3)

Samples

(Requires Login)

(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)

(3)

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

Addendum-Page 1

PACKAGE OPTION ADDENDUM

www.ti.com

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.

10-Jun-2010

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.

Addendum-Page 2

PACKAGE MATERIALS INFORMATION

www.ti.com 20-Jul-2010

TAPE AND REEL INFORMATION

*All dimensions are nominal

Device Package

BQ24090DGQR MSOP-

BQ24090DGQT MSOP-

BQ24091DGQR MSOP-

BQ24091DGQT MSOP-

BQ24092DGQR MSOP-

Type

Power

PAD

Power

PAD

Power

PAD

Power

PAD

Power

PAD

Package Drawing

DGQ 10 2500 330.0 12.4 5.3 3.3 1.3 8.0 12.0 Q1

DGQ 10 250 180.0 12.4 5.3 3.3 1.3 8.0 12.0 Q1

DGQ 10 2500 330.0 12.4 5.3 3.3 1.3 8.0 12.0 Q1

DGQ 10 250 180.0 12.4 5.3 3.3 1.3 8.0 12.0 Q1

DGQ 10 2500 330.0 12.4 5.3 3.3 1.3 8.0 12.0 Q1

Pins SPQ Reel

Diameter

(mm)

Reel

Width

W1 (mm)

(mm)B0(mm)K0(mm)P1(mm)W(mm)

Quadrant

Pin1

Pack Materials-Page 1

PACKAGE MATERIALS INFORMATION

www.ti.com 20-Jul-2010

*All dimensions are nominal

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

BQ24090DGQR MSOP-PowerPAD DGQ 10 2500 346.0 346.0 35.0 BQ24090DGQT MSOP-PowerPAD DGQ 10 250 203.0 203.0 35.0 BQ24091DGQR MSOP-PowerPAD DGQ 10 2500 346.0 346.0 35.0 BQ24091DGQT MSOP-PowerPAD DGQ 10 250 203.0 203.0 35.0 BQ24092DGQR MSOP-PowerPAD DGQ 10 2500 346.0 346.0 35.0

Pack Materials-Page 2

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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 bq24090, bq24091, bq24092, bq24093 Technical data

Specifications and Main Features

Frequently Asked Questions

User Manual

FEATURES

APPLICATIONS

DESCRIPTION

DESCRIPTION CONTINUED

ABSOLUTE MAXIMUM RATINGS

PACKAGE DISSIPATION RATINGS

RECOMMENDED OPERATING CONDITIONS

ELECTRICAL CHARACTERISTICS

PIN CONFIGURATION

Typical Application Circuit: bq2409x

FUNCTIONAL BLOCK DIAGRAM

TYPICAL OPERATIONAL CHARACTERISTICS

PROTECTION CIRCUITS WAVEFORMS

FUNCTIONAL GENERAL DESCRIPTION

DETAILED FUNCTIONAL DESCRIPTION

Power-Down or Undervoltage Lockout (UVLO)

Power-up

Sleep Mode

New Charge Cycle

Overvoltage-Protection (OVP) – Continuously Monitored

Power Good Indication (PG)

CHG Pin Indication

CHG and PG LED Pull-up Source

ISET

ISET2

PRE_TERM – Pre-Charge and Termination Programmable Threshold

Termination and Timer Disable Mode (TTDM) -TS pin high

Timers

Termination

Battery Detect Routine

Refresh Threshold

Starting a Charge on a Full Battery

bq24090 CHARGER APPLICATION DESIGN EXAMPLE

Requirements

Calculations

TS Function

SELECTING IN AND OUT PIN CAPACITORS

THERMAL PACKAGE

Leakage Current Effects on Battery Capacity

Layout Tips

REVISION HISTORY