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RGE
PW
www.ti.com
SLUS546D − MARCH 2003 − REVISED SEPTEMBER 2004
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FEATURES
APPLICATIONS
D
D
D
Notebook PCs
D
2-, 3-, or 4-Cell Series Protection Control
Medical and Test Equipment
Portable Instrumentation
D
Can Directly Interface With the bq2084 Gas
Gauges
D
Provides Individual Cell Voltages and Battery
Voltage to Battery Management Host
DESCRIPTION
The bq29312 is a 2-, 3-, or 4-cell lithium-ion battery pack
protection analog front end (AFE) IC that incorporates a
3.3-V, 25-mA low-dropout regulator (LDO). The bq29312
also integrates an I2C compatible interface to extract
battery parameters such as cell voltages and control
output status. Other parameters such as current protection
thresholds and delays can be programmed into the
bq29312 to increase the flexibility of the battery
management system.
D
Integrated Cell Balancing Drive
2
D
I C Compatible User Interface Allows Access
to Battery Information
D
Programmable Threshold and Delay for Over
Load and Short Circuit During Charge and
Discharge
D
D
System Alert Interrupt Output
Host Control Can Initiate Sleep Power Mode
and Ship Mode
The bq29312 provides safety protection for overcharge,
overload, short-circuit, overvoltage, and undervoltage
conditions in conjunction with the battery management
host. In overload and short-circuit conditions, the bq29312
turns the FET drive off autonomously dependant on the
internal configuration setting.
D
D
D
Integrated 3.3-V, 25-mA LDO
Supply Voltage Range From 4.5 V to 25 V
Low Supply Current of 60-µA Typical
SYSTEM PARTITIONING DIAGRAM
Discharge / Charge /
Pre−Charge FETs
Fuse
Pack +
bq2084
bq29312
PF Input
PCH FET Drive
Pre-charge Control Fail-Safe Protection
Supply Voltage
Power Management
LDO, TOUT and Power mode control
Cell Balancing
Drive
Pre−Charge
FET Drive
Temperature Measurement
<1% Error
T
INT
LDO, Therm Output Drive & UVLO
T1
768 Bytes of
User Flash
32kHz Clock
Generator
System Watchdog
Delay Counters
32kHz
Cell Balancing Algorithm and Control
SBS v1.1 Data System Interface
SMBus
System Interface
RAM Registers
2
I
C
XAlert
Sleep
bq29312 RAM/Comms Validation
st
st
Power Mode Control
1
Level OC
1
Level OV and
Protection
UV Protection
Pack Under Voltage
Power Mode
Control
Cell and Pack
Voltage
Measurement
2−Tier Over Current Protection
Voltage Level Translator
Capacity Prediction <1% Error
Pack −
Sense Resistor
(10 − 30 mΩ)
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.
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Copyright 2004, Texas Instruments Incorporated