PW

RTH

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FEATURES

APPLICATIONS

DESCRIPTION

SYSTEM PARTITIONING DIAGRAM

LDO, Therm Output Drive & UVLO

Power Management

LDO, TOUT, and Power Mode control

I2C

Capacity Prediction <1% Error

SMBus

Pack +

Pack -

Discharge / Charge /

Precharge FETs

Cell and Pack

Voltage

Measurement

Precharge

FET Drive

2-Tier Overcurrent Protection

32-kHz Clock

Generator

bq2084

768 Bytes of

User Flash

Fuse

1stLevel OV and

UV Protection

Pack Undervoltage

Power Mode

Control

Precharge Control

Delay Counters

Cell Balancing Algorithm and Control

Cell Balancing

Drive

System Interface

System Watchdog

Voltage Level Translator

System Interface

32 kHz

Power Mode Control

Fail-Safe Protection

T1

1st Level OC

Protection

Temperature Measurement

<1% Error

TINT

Supply V oltage

bq29312A

PCH FET Drive

RAM Registers

SBS v1.1 Data

bq29312 RAM/Comms Validation

XAlert

Sleep

Sense Resistor

(10 - 30 m W)

PF Input

bq29312A

SLUS629A – JANUARY 2005 – REVISED AUGUST 2005

TWO-CELL, THREE-CELL, AND FOUR-CELL LITHIUM-ION OR

LITHIUM-POLYMER BATTERY PROTECTION AFE

•

Notebook PCs

•

2-, 3-, or 4-Cell Series Protection Control

•

Medical and Test Equipment

•

Can Directly Interface With the bq2084 Gas

•

Portable Instrumentation

Gauges

•

Provides Individual Cell Voltages and Battery

Voltage to Battery Management Host

The bq29312A is a 2-, 3-, or 4-cell lithium-ion battery

•

Integrated Cell Balancing Drive

pack protection analog front end (AFE) IC that

•

incorporates a 3.3-V, 25-mA low-dropout regulator

to Battery Information

•

Programmable Threshold and Delay for

ible interface to extract battery parameters such as

Overload and Short Circuit During Charge and

cell voltages and control output status. Other par-

Discharge

ameters such as current protection thresholds and

delays can be programmed into the bq29312A to

•

System Alert Interrupt Output

increase the flexibility of the battery management

•

Host Control Can Initiate Sleep Power Mode

system.

and Ship Mode

The bq29312A provides safety protection for over-

•

Integrated 3.3-V, 25-mA LDO

charge,

overload,

short-circuit,

overvoltage,

and

•

Supply Voltage Range From 4.5 V to 25 V

undervoltage conditions with the battery management

host. In overload and short-circuit conditions, the

•

Low Supply Current of 60-µA Typical

bq29312A turns the FET drive off autonomously

•

bq29312A is 100% specification compatible

dependant on the internal configuration setting.

with the bq29312

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.

Copyright © 2005, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.