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TP3201

1cell Li-ion battery Protector IC

Topro 

TP3201

1cell Li-ion battery

Protector IC

5.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 TP3201

• 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.

● VD2/Over-Discharge Detector

• The VD2 monitors a VDD pin voltage. When the VDD voltage crosses the over-discharge detector threshold VDET2 from a high value to a value

lower than the VDET2, the VD2 can sense an over-discharging and the external discharge control Nch-MOS-FET turns to “OFF” with the DOUT

pin being at "L".

• Resetting the VD2 with the DOUT pin level being "H" again after detecting over-discharge is only possible by connecting a charger to the battery

pack. When the VDD voltage stays under over-discharge detector threshold VDET2 charge current can flow through parasitic diode of external

discharge control Nch-MOS-FET, then after the VDD voltage comes up to a value larger than VDET2 discharging process would be advanced

through “ON” state discharge control Nch-MOS-FET. Connecting a charger to the battery pack makes the DOUT level being "H" instantaneously

when the VDD voltage is higher than VDET2.

• When a cell voltage equals to zero, connecting charger to the battery pack makes the system allowable for charge with higher charge voltage

than Vst, 1.2V Max.

Page 7 of 12

TOPRO CONFIDNETIAL

2003/7/8 Print

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