C0098C0113C0050C0057C0051C0049C0050
SLUS546D − MARCH 2003 − REVISED SEPTEMBER 2004
C0084C0072C0082C0069C0069 C0065C0078C0068 C0070C0079C0085C0082 C0067C0069C0076C0076 C0076C0073C0084C0072C0073C0085C0077C0262C0073C0079C0078 C0079C0082
C0076C0073C0084C0072C0073C0085C0077C0262C0080C0079C0076C0089C0077C0069C0082 C0066C0065C0084C0084C0069C0082C0089 C0080C0082C0079C0084C0069C0067C0084C0073C0079C0078 C0065C0070C0069
PW
RGE

FEATURES
C0068 2-, 3-, or 4-Cell Series Protection Control
C0068 Can Directly Interface With the bq2084 Gas
Gauges
C0068 Provides Individual Cell Voltages and Battery
Voltage to Battery Management Host
C0068 Integrated Cell Balancing Drive
C0068 I
2
C Compatible User Interface Allows Access
to Battery Information
C0068 Programmable Threshold and Delay for Over
Load and Short Circuit During Charge and
Discharge
C0068 System Alert Interrupt Output
C0068 Host Control Can Initiate Sleep Power Mode
and Ship Mode
C0068 Integrated 3.3-V, 25-mA LDO
C0068 Supply Voltage Range From 4.5 V to 25 V
C0068 Low Supply Current of 60-µA Typical
APPLICATIONS
C0068 Notebook PCs
C0068 Medical and Test Equipment
C0068 Portable Instrumentation
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 I
2
C 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.
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.
SYSTEM PARTITIONING DIAGRAM
LDO, Therm Output Drive & UVLO
Power Management
LDO, TOUT and Power mode control
I
2
C
Capacity Prediction <1% Error
SMBus
Pack +
Pack −
Discharge / Charge /
Pre−Charge FETs
Cell and Pack
Voltage
Measurement
Pre−Charge
FET Drive
2−Tier Over Current Protection
32kHz Clock
Generator
bq2084
768 Bytes of
User Flash
Fuse
1
st
Level OV and
UV Protection
Pack Under Voltage
Power Mode
Control
Pre-charge Control
Delay Counters
Cell Balancing Algorithm and Control
Cell Balancing
Drive
System Interface
System Watchdog
Voltage Level Translator
System Interface
32kHz
Power Mode Control
Fail-Safe Protection
T1
1
st
Level OC
Protection
Temperature Measurement
<1% Error
T
INT
Supply Voltage
bq29312
PCH FET Drive
RAM Registers
SBS v1.1 Data
bq29312 RAM/Comms Validation
2
n
d
Level Over V
oltage
Protection
XAlert
Sleep
Sense Resistor
(10 − 30 mΩ)
PF Input
C0080C0082C0079C0068C0085C0067C0084C0073C0079C0078 C0068C0065C0084C0065 C0105C0110C0102C0111C0114C0109C0097C0116C0105C0111C0110 C0105C0115 C0099C0117C0114C0114C0101C0110C0116 C0097C0115 C0111C0102 C0112C0117C0098C0108C0105C0099C0097C0116C0105C0111C0110 C0100C0097C0116C0101C0046 C0080C0114C0111C0100C0117C0099C0116C0115
C0099C0111C0110C0102C0111C0114C0109 C0116C0111 C0115C0112C0101C0099C0105C0102C0105C0099C0097C0116C0105C0111C0110C0115 C0112C0101C0114 C0116C0104C0101 C0116C0101C0114C0109C0115 C0111C0102 C0084C0101C0120C0097C0115 C0073C0110C0115C0116C0114C0117C0109C0101C0110C0116C0115 C0115C0116C0097C0110C0100C0097C0114C0100 C0119C0097C0114C0114C0097C0110C0116C0121C0046
C0080C0114C0111C0100C0117C0099C0116C0105C0111C0110 C0112C0114C0111C0099C0101C0115C0115C0105C0110C0103 C0100C0111C0101C0115 C0110C0111C0116 C0110C0101C0099C0101C0115C0115C0097C0114C0105C0108C0121 C0105C0110C0099C0108C0117C0100C0101 C0116C0101C0115C0116C0105C0110C0103 C0111C0102 C0097C0108C0108 C0112C0097C0114C0097C0109C0101C0116C0101C0114C0115C0046
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.
www.ti.com
Copyright  2004, Texas Instruments Incorporated