bq2057, bq2057C
bq2057T, bq2057W
SLUS025F − MAY 2001 − REVISED JULY 2002
Terminal Functions
TERMINAL
NO.
NAME
BAT
CC
COMP
SNS
STAT
TS
VCC
VSS
SOIC (SN) and
TSSOP (TS)
2
7
8
1
5
4
3
6
MSOP
(DGK)
8
5
6
7
3
2
1
4
I
O
I
I
O
I
I
Voltage sense input
Charge control output
Charge-rate compensation input (AutoComp)
Current sense input
Charge status output
Temperature sense input
Supply voltage
Ground
I/O
DESCRIPTION
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.
4
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