bq2057, bq2057C

bq2057T, bq2057W

SLUS025F − MAY 2001 − REVISED JULY 2002

4

www.ti.com

Terminal Functions

TERMINAL

NO.

I/O

DESCRIPTION

NAME

SOIC (SN) and

TSSOP (TS)

MSOP

(DGK)

I/O

DESCRIPTION

BAT

2

8

I

Voltage sense input

CC

7

5

O

Charge control output

COMP

8

6

I

Charge-rate compensation input (AutoComp)

SNS

1

7

I

Current sense input

STAT

5

3

O

Charge status output

TS

4

2

I

Temperature sense input

VCC

3

1

I

Supply voltage

VSS

6

4

Ground

detailed description

current-sense input

Battery current is sensed via the voltage developed on this pin by an external sense resistor. The external

resistor can be placed on either the high or low side of the battery. (See schematics for details.)

battery-voltage input

Voltage sense-input tied directly to the positive side of the battery.

temperature sense input

Input for an external battery-temperature monitoring circuit. Connecting this input to VCC/2 disables this feature.

charge-status output

3-state indication of charge in progress, charge complete, and temperature fault or sleep mode.

charge-control output

Source-follower output that drives an external pass-transistor (PNP or P-channel MOSFET) for current and

voltage regulation.

charge-rate compensation input

Sets the charge-rate compensation level. The voltage-regulation output may be programmed to vary as a

function of the charge current delivered to the battery.

supply voltage input

Power supply input and current reference for high-side sensing configuration.