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                  Home > Li-Battery Protection or Charg
                  UB2421 Datasheet






                  UTC UB2421 is a lithium-ion / lithium-polymer rechargeable

                  battery protection IC incorporating high accuracy voltage detection

                  circuits and delay circuits.

                  It is suitable for protection of single cell lithium-ion / lithium

                  polymer battery packs from overcharge, over discharge and over


                  The tiny package required external few components make the

                  UTC UB2421 be able to be applied to space limited battery pack.




                  * Wide supply voltage range: V DD =1.8V~6.5V

                  * Ultra-low quiescent current: I DD =3.0μA (V DD =3.5V)

                  * Ultra-low power-down current: I PD =0.2μA (V DD =1.5V)

                  * Overcharge detection voltage: V OCU =4.30V±0.05V

                  * Overcharge release voltage:  V OCR =4.10V±0.05V

                  * Overdischarge release voltage: V ODL =2.40V±0.10V

                  * Overdischarge release voltage: V ODR =3.00V±0.10V

                  * Over current detection voltage: V OI1 =0.15V±0.05V

                  * Short circuit detection voltage: V OI2 =1.35V (Fixed)

                  * Charger detection voltage: V CH =-0.7V

                  * Delay times are generated by an internal circuit.

                  (External capacitors are unnecessary.)

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