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FEATURES

FUNCTION

APPLICATIONS

DESCRIPTION

1

2

3

4

8

7

6

5

VC1

VC2

VC3

GND

OUT

VDD

CD

VC4

PW PACKAGE

(TOP VIEW)

GND

OUT

VDD

CD

VC4

VC1

VC3

1

2

VC2

3

4

5

6

7

8

DCT PACKAGE

(TOP VIEW)

bq29400, bq29400A

bq29401, bq29405

SLUS568C – JULY 2003 – REVISED SEPTEMBER 2005

VOLTAGE PROTECTION FOR 2-, 3-, OR 4-CELL Lion 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 bq2940x device starts charging an

•

High Accuracy Over Sense Voltage:

external capacitor through the CD pin. When the CD

– bq29400: 4.35 V

±25 mV

pin voltage reaches 1.2 V, the OUT pin changes from

a low level to a high level.

– bq29400A: 4.40 V

±25 mV

– bq29401: 4.45 V

±25 mV

– bq29405: 4.65 V

±25 mV

•

Prefixed Protection Threshold Voltage

•

Programmable Delay Time

•

High Power Supply Ripple Rejection

•

Stable During Pulse Charge Operation

•

– Notebook PCs

– Portable Instrumentation

– Medical and Test Equipment

The bq29400, bq29400A, bq29401, and bq29405 are

BiCMOS secondary protection ICs for 2-, 3-, or 4-cell

Lithium-Ion

battery

packs

that

incorporate

a

high-accuracy precision over voltage detection circuit.

They include a programmable delay circuit for over

voltage detection time.

ORDERING INFORMATION

PACKAGE

MSSOP (DCT3)

SYMBOL

SYMBOL

4.35 V

bq29400DCT3

CIQ

bq29400PW

2400

4.40 V

bq29400ADCT3

CIT

Not Available

-

–25

°C to 85°C

4.45 V

bq29401DCT3

CIR

bq29401PW

2401

4.65 V

bq29405DCT3

CIS

Not Available

-

(1)

The bq29400, bq29400A, bq29401, and bq29405 are available taped and reeled. Add an R suffix to the device type (e.g.,

bq29400PWR) to order tape and reel version.

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 © 2003–2005, 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.

Not Recommended for New Designs:

bq29400, bq29400A, bq29405