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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 of10mV in a temperature range from 0XC to 50XC.

TYPICAL APPLICATION

TYPICAL APPLICATION

TIN GExternal 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 45XC, 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