bq2057, bq2057C
bq2057T, bq2057W
SLUS025F − MAY 2001 − REVISED JULY 2002
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
termination threshold, I
(TERM)
. The bq2057 automatically restarts the charge if the battery voltage falls below
the V
(RCH)
threshold.
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
4.1 V
4.2 V
−20°C to 70°C
8.2 V
8.4 V
† Note the difference in pinout for this package.
SOIC
(SN)
Not available
bq2057CSN
Not available
bq2057WSN
TSSOP
(TS)
bq2057TS
bq2057CTS
bq2057TTS
bq2057WTS
Not available
MSOP†
(DGK)
bq2057DGK
bq2057CDGK
2
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