bq2057, bq2057C

bq2057T, bq2057W

SLUS025F − MAY 2001 − REVISED JULY 2002

ADVANCED LINEAR CHARGE MANAGEMENT IC

FOR SINGLE AND TWOCELL LITHIUMION AND LITHIUMPOLYMER

1

www.ti.com

FEATURES

(8.2 V or 8.4 V) Li-Ion or Li-Pol Packs

Components

Dissipation

With Preset Voltages

Battery Pack’s Internal Impedance to Reduce

Charge Time

and During Charge

With Programmable Charge-Current and High-

or Low-Side Current Sensing

Deeply Discharged Cells and Minimizing Heat

Dissipation During Initial Stage Of Charge

or Host Processor Interface

Is Removed

MSOP

DESCRIPTION

The

BENCHMARQ

bq2057

series

advanced

Lithium-Ion (Li-Ion) and Lithium-Polymer (Li-Pol) linear

charge-management ICs are designed for cost-

sensitive and compact portable electronics. They

combine high-accuracy current and voltage regulation,

battery conditioning, temperature monitoring, charge

termination, charge-status indication, and AutoComp

charge-rate compensation in a single 8-pin IC. MSOP,

TSSOP, and SOIC package options are offered to fit a

wide range of end applications.

The

bq2057

continuously

measures

battery

temperature using an external thermistor. For safety,

the bq2057 inhibits charge until the battery temperature

is within user-defined thresholds. The bq2057 then

charges the battery in three phases: conditioning,

constant current, and constant voltage. If the battery

bq2057 precharges using a low current to condition the

battery. The conditioning charge rate is approximately

10% of the regulation current. The conditioning current

also minimizes heat dissipation in the external pass-

element during the initial stage of the charge. After

conditioning, the bq2057 applies a constant current to

the battery. An external sense-resistor sets the current.

The sense-resistor can be on either the high or low side

of the battery without additional components. The

constant-current phase continues until the battery

reaches the charge-regulation voltage.

COMP

CC

VSS

STAT

8

7

6

5

1

2

3

4

SNS

BAT

VCC

TS

bq2057xSN or bq2057xTS

SOIC (SN) or TSSOP (TS) PACKAGE

(TOP VIEW)

BAT

SNS

COMP

CC

8

7

6

5

1

2

3

4

VCC

TS

STAT

VSS

bq2057xDGK

MSOP (DGK) PACKAGE

(TOP VIEW)

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.

AutoComp is a trademark of Texas Instruments.

Copyright

 2002, Texas Instruments Incorporated

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.