CN3302 2.75V to 6.5V PFM Boost Dual-cell Lithium Battery Charging Control IC - SOP-8

CN3302 2.75V to 6.5V PFM Boost Dual-cell Lithium Battery Charging Control IC - SOP-8

Datasheet

CN3302 is a PFM boost type operating from 2.75V to 6.5V Dual-cell lithium battery charging control integrated circuit. CN3302 adopts constant current and quasi-constant voltage mode (Quasi-CVTM) to charge the battery, Internally integrated reference voltage source, inductor current detection unit, electric Cell voltage detection circuit and off-chip field effect transistor drive circuit etc., with the advantages of fewer external components and simple circuit.

When the input power is turned on, CN3302 enters the charging state and controls When the off-chip N-channel MOSFET is turned on, the inductor current rises. When the upper limit set by the external current sense resistor is reached, the off-chip N-channel. The MOSFET turns off, the inductor current decreases, and the energy in the inductor transfers Move to battery. When the inductor current drops to the external current sense circuit When the resistance reaches the lower limit of the setting, the off-chip N-channel MOSFET turns on again. And so on. When the BAT pin voltage first reaches the internal setting When 8.4V (typ. value), CN3302 enters quasi-constant voltage charging mode. Charge the battery with a smaller current. In quasi-constant voltage mode, when BAT When the pin voltage reaches 8.4V, the charging process ends, and the off-chip N-channel The MOSFET remains off. When the BAT pin voltage drops to At the recharge threshold, CN3302 enters the charging state again. The maximum operating frequency of CN3302 can reach 1MHz.