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TP3102

1Cell Li-ion Battery Protector IC

Topro 

TP3102

1Cell Li-ion Battery

Protector IC

Function Descriptions:

● VD1/Over-Charge Detector

• The VD1 monitors VDD pin voltage. When the VDD voltage crosses over-charge detector threshold

VDET1 from a low value to a value higher than the VDET1 the VD1 can sense over-charging and

an external charge control Nch-MOS-FET turns to "OFF' with COUT pin being at "L".

• A level shifter incorporated in a buffer driver for the COUT pin makes the "L" of COUT pin to the

V- pin voltage and the "H" of COUT pin is set to VDD voltage with CMOS buffer.

Reset conditions from overcharging of TP3102

• There can be two cases to reset the VD1 making the COUT pin level to "H" again after detecting

overcharge. Resetting the VD1 makes the charging system ready for resumption of charging process.

The first case is in such condition that a time when the VDD voltage is coming down to a level

lower than “VDET1- VHYS1”.

While in the second case, disconnecting a charger from the battery pack can make the VD1 resetting

when the VDD level is within hysteresis width (VDET1 – VHYS1<VDD<VDETl)

• After detecting overcharge with the VDD voltage of higher than VDET1, connecting system load to

the battery pack makes load current allowable through parasitic diode of external charge control

Nch-MOS-FET. The COUT level would be "H" when the VDD level is coming down to a level

below the VDET1 by continuous drawing of load current.

Print Page 6 of 13

表單編號 QW730101-05A

TOPRO CONFIDNETIAL

2003/7/28 Print

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