C0098C0113C0050C0057C0051C0049C0049
SLUS487D − DECEMBER 2001 − REVISED NOVEMBER 2003
C0084C0072C0082C0069C0069C0262 C0065C0078C0068 C0070C0079C0085C0082C0262C0067C0069C0076C0076 C0076C0073C0084C0072C0073C0085C0077C0262C0073C0079C0078 C0079C0082
C0076C0073C0084C0072C0073C0085C0077C0262C0080C0079C0076C0089C0077C0069C0082 C0066C0065C0084C0084C0069C0082C0089 C0080C0082C0079C0084C0069C0067C0084C0073C0079C0078 C0073C0067

FEATURES
C0068 3- or 4-Cell Series Protection Control
C0068 Autonomous Overcurrent and Short Circuit
Protection
C0068 Provides Individual Cell Voltages to Battery
Management Host
C0068 Integrated Cell Balancing Control
C0068 I
2
C Compatible User Interface Allows Access
to Battery Information
C0068 User Control to Initiate Protection
C0068 Integrated 3.3-V 25-mA LDO
C0068 Programmable Shutdown and Brownout
Control
C0068 Provides Drive for Three External FETs
C0068 Low Supply Current of 140 µA Typical
C0068 Programmable Threshold and Delay for
Short-Circuit Current Protection
C0068 Provides Drive for Three External FETs
C0068 Can Directly Interface With bq2083/5 for
Complete Battery Management Solution
APPLICATIONS
C0068 Notebook Computer Battery Packs
C0068 Test Equipment
DESCRIPTION
The bq29311 is a three- or four-cell lithium-ion battery
pack protection analog front end (AFE) IC that
incorporates a 3.3-V 25-mA low-dropout regulator
(LDO) and an I
2
C compatible interface to extract battery
parameters such as cell voltages and control output
status. Other parameters, such as overcurrent
protection threshold and delay, can also be
programmed into the bq29311 to increase the flexibility
of the battery management system.
The bq29311 provides safety protection in overcurrent,
short circuit, overvoltage, and undervoltage conditions
via control from the battery management host. In
overcurrent and short-circuit conditions the bq29311
can directly activate the FET drive as a secondary
protection level. The communications interface allows
the host to control and observe the current status of the
protection, to set overcurrent and overload levels, to set
the overcurrent and overload blanking delay time,
short-circuit threshold levels, and short-circuit blanking
delay time, and to program for the VREG shutdown
voltage and brownout-detection thresholds.
Each cell is balanced by a discharge path, which is
enabled by the internal control registers accessible
through the I
2
C compatible interface. The maximum
current is set by an external series resistor with an
absolute maximum value of 10 mA discharge current
per cell.
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
VCC
VBAT
VC1
VC2
VC3
VC4
VC5
SR1
SR2
CNTL
GND
VCELL
VPACK
DSG
PCHG
CHG
LEDOUT
VREG
TOUT
XALERT
CLKIN
SDATA
SCLK
GND
PW PACKAGE
(TOP VIEW)
ORDERING INFORMATION
T
A
−25°C to 85°C
PACKAGED TSSOP
(PW)
bq29311PW
bq29311PWR
(1)
PIN ASSIGNMENTS
(1)
R suffix indicates tape and reel.
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  2001 − 2003, Texas Instruments Incorporated