GND

OUT

VDD

CD

VC4

VC1

VC3

1

2

VC2

3

4

5

6

7

8

DCTPACKAGE

(TOPVIEW)

1

2

3

4

8

7

6

5

VC1

VC2

VC3

GND

OUT

VDD

CD

VC4

PWPACKAGE

(TOPVIEW)

Not Recommended for New Designs

bq29410, bq29411, bq29412

bq29413, bq29414

bq29415, bq29419

www.ti.com

SLUS669G – AUGUST 2005 – REVISED AUGUST 2008

VOLTAGE PROTECTION FOR 2-, 3-, OR 4-CELL Li-Ion BATTERIES

Check for Samples: bq29410, bq29411, bq29412, bq29413, bq29414, bq29415, bq29419

1

FEATURES

DESCRIPTION

The bq2941x is a secondary overvoltage protection

•

2-, 3-, or 4-Cell Secondary Protection

IC for 2-, 3-, or 4-cell lithium-ion battery packs that

•

incorporates a high-accuracy precision overvoltage

detection circuit. It includes a programmable delay

•

Fixed High Accuracy Overvoltage Protection

circuit for overvoltage detection time.

Threshold

FUNCTION

–

bq29410 = 4.35 V

Each cell in a multiple-cell pack is compared to an

–

bq29411 = 4.40 V

internal reference voltage. If one cell reaches an

–

bq29412 = 4.45 V

overvoltage

condition,

the

protection

sequence

–

bq29413 = 4.50 V

begins. The bq2941x device starts charging an

external capacitor through the CD pin. When the CD

–

bq29414 = 4.55 V

pin voltage reaches 1.2 V, the OUT pin changes from

–

bq29415 = 4.60 V

a low level to a high level.

–

bq29419 = 4.30 V

•

Programmable Delay Time of Detection

•

High Power Supply Ripple Rejection

•

Stable During Pulse Charge Operation

APPLICATIONS

•

Battery Packs in:

–

Notebook Computers

–

Portable Instrumentation

–

Portable Equipment

1

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.

Copyright © 2005–2008, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.