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Home > Li-Battery Protection or Charg
UB3421 Datasheet






The UTC UB3421 is a series of lithium-ion/lithium-polymer

rechargeable battery protection ICs incorporating high accuracy

voltage detection circuits and delay circuits.

The UTC UB3421 is suitable for protection of single cell lithium-ion

/ lithium polymer battery packs from overcharge, over discharge and

over current.

The ultra-small package and less required external components

make it ideal to integrate the UTC UB3421 into the limited space of

battery pack.




*  Wide Supply Voltage Range: V DD =1.8V~6.5V

* Ultra-Low Quiescent Current: I OPE =3.0μA (V DD =3.5V)

* Ultra-Low Power-Down Current: I PDN =0.2μA (V DD =1.5V)

* Overcharge Detection Voltage: V CU =3.9V~4.4V

* Overcharge Release Voltage: V CL =3.8V~4.4V

* Over Discharge Release Voltage: V DL =2.0V~3.0V

* Over Discharge Release Voltage: V DU =2.0V~3.4V

* Over Current 1 Detection Voltage: V IOV1 =0.10V~0.20V

* Over Current 2 Detection Voltage: V IOV2 =0.5V (Fixed)

* Short Circuit Detection Voltage: V SHORT =1.2V (Fixed)

* Charge overcurrent detection voltage: V CIP =-0.2V (Fixed)

* Delay Times are Generated by an Internal Circuit. (External Capacitors are Unnecessary.)

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