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2-Cell Li-ion Battery Protection ICs

Ricoh's 2-cell Li-ion/polymer battery protection ICs have a high accuracy. Especially R5462 Series have a high accuracy over-charge detection of±10mV in a temperature range from 0°C to 50°C.

TYPICAL APPLICATION

TYPICAL APPLICATION

TIN :External thermistor connection pin.
RIN: External resistor connection pin.
Ps: P-channel source pin for over-charge alarm output*

*)Alarm output pin (AOUT) is a P-channel open drain output.
In the R5464K, the source of AOUT is Ps pin, not VDD pin. Therefore, the external pull-down resistor, R6 does not have an impact on the drop out between a plus terminal of a battery pack and a VDD pin. Thus, R6 value range is wide enough to choose.

*)Products built-in the Alarm output pin(AOUT): R5461K, R5464K, R5466K

Alarm Function

Alarm Function

When cell 1 voltage or cell 2 voltage exceeds the alarm threshold voltage (VALML), an alarm signal will be present at the AOUT pin. If the detection temperature of thermistor exceeds 45°C, the alarm detect voltage threshold changes to VALMH. (The detection temperature can be changed)

*)Products with alarm output controlled by an external thermistor.:
R5461K, R5464K, R5466K