BQ29311_15 Datasheet, PDF (1/24 Pages) Texas Instruments – FOUR-CELL LITHIUM-ION

Not Recommended for New Designs
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bq29311
SLUS487D − DECEMBER 2001 − REVISED NOVEMBER 2003
THREEĆ AND FOURĆCELL LITHIUMĆION OR
LITHIUMĆPOLYMER BATTERY PROTECTION IC
FEATURES
D 3- or 4-Cell Series Protection Control
D Autonomous Overcurrent and Short Circuit
Protection
D Provides Individual Cell Voltages to Battery
Management Host
D Integrated Cell Balancing Control
D I²C Compatible User Interface Allows Access
to Battery Information
D User Control to Initiate Protection
D Integrated 3.3-V 25-mA LDO
D Programmable Shutdown and Brownout
Control
D Provides Drive for Three External FETs
D Low Supply Current of 140 µA Typical
D Programmable Threshold and Delay for
Short-Circuit Current Protection
D Provides Drive for Three External FETs
D Can Directly Interface With bq2083/5 for
Complete Battery Management Solution
APPLICATIONS
D Notebook Computer Battery Packs
D Test Equipment
PIN ASSIGNMENTS
PW PACKAGE
(TOP VIEW)
VCC
1
VBAT
2
VC1
3
VC2
4
VC3
5
VC4
6
VC5
7
SR1
8
SR2
9
CNTL
10
GND
11
VCELL
12
24
VPACK
23
DSG
22
PCHG
21
CHG
20
LEDOUT
19
VREG
18
TOUT
17
XALERT
16
CLKIN
15
SDATA
14
SCLK
13
GND
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 I²C 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 I²C compatible interface. The maximum
current is set by an external series resistor with an
absolute maximum value of 10 mA discharge current
per cell.
ORDERING INFORMATION
PACKAGED TSSOP
TA
(PW)
−25°C to 85°C
bq29311PW
bq29311PWR(1)
(1) _{R suffix indicates tape and reel.}
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 Texas Instruments standard warranty.
Production processing does not necessarily include testing of all parameters.
Copyright  2001 − 2003, Texas Instruments Incorporated