bq2057, bq2057C

bq2057T, bq2057W

SLUS025F − MAY 2001 − REVISED JULY 2002

2

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DESCRIPTION (continued)

The bq2057 then begins the constant-voltage phase. The accuracy of the voltage regulation is better than

±1%

over the operating-temperature and supply-voltage ranges. For single and dual cells, the bq2057 is offered in

four fixed-voltage versions: 4.1 V, 4.2 V, 8.2 V, and 8.4 V. Charge stops when the current tapers to the charge

The designer also may use the AutoComp feature to reduce charging time. This proprietary technique allows

safe and dynamic compensation for the internal impedance of the battery pack during charge.

AVAILABLE OPTIONS

PACKAGE

TA

CHARGE REGULATION

VOLTAGE

SOIC

(SN)

TSSOP

(TS)

MSOP†

(DGK)

4.1 V

Not available

bq2057TS

bq2057DGK

−20

°C to 70°C

4.2 V

bq2057CSN

bq2057CTS

bq2057CDGK

−20

°C to 70°C

8.2 V

Not available

bq2057TTS

Not available

8.4 V

bq2057WSN

bq2057WTS

Not available

† Note the difference in pinout for this package.