bq29311

SLUS487D − DECEMBER 2001 − REVISED NOVEMBER 2003

THREE AND FOURCELL LITHIUMION OR

LITHIUMPOLYMER BATTERY PROTECTION IC

FEATURES

Protection

Management Host

to Battery Information

Control

Short-Circuit Current Protection

Complete Battery Management Solution

APPLICATIONS

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

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

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

TA

−25

°C to 85°C

PACKAGED TSSOP

(PW)

bq29311PW

bq29311PWR(1)

PIN ASSIGNMENTS

(1) R suffix indicates tape and reel.

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.

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

 2001 − 2003, Texas Instruments Incorporated