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FEATURES

FUNCTION

APPLICATIONS

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)

DESCRIPTION

bq29410, bq29411, bq29412

bq29413, bq29414, bq29415

SLUS669D – AUGUST 2005 – REVISED OCTOBER 2006

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

•

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

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

internal reference voltage. If one cell reaches an

•

overvoltage

condition,

the

protection

sequence

begins. The bq2941x device starts charging an

•

Fixed High Accuracy Overvoltage Protection

external capacitor through the CD pin. When the CD

Threshold

pin voltage reaches 1.2 V, the OUT pin changes

– bq29410 = 4.35 V

from a low level to a high level.

– bq29411 = 4.40 V

– bq29412 = 4.45 V

– bq29413 = 4.50 V

– bq29414 = 4.55 V

– bq29415 = 4.60 V

•

Programmable Delay Time of Detection

•

High Power Supply Ripple Rejection

•

Stable During Pulse Charge Operation

•

Battery Packs in:

– Notebook Computers

– Portable Instrumentation

– Portable Equipment

The bq2941x is a secondary overvoltage 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

circuit for overvoltage detection time.

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.

UNLESS

OTHERWISE

NOTED

this

document

contains

Copyright © 2005–2006, Texas Instruments Incorporated

PRODUCTION DATA information 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.