CN3305 Datasheet | CONSONANCE

Description ： Features ： CN3305 is a PFM mode step-up battery charge management IC with operating voltage range between 2.7V to 6.5V. It is specially designed for multi-cell lithium-ion, Li Fe PO4 and Lead Acid battery charge management with fewer external ponents. CN3305 adopts constant current and quasi-constant voltage(Quasi-CVTM) mode to charge battery. On power up, CN3305 enters charging mode, the external N-channel MOSFET is turned on, inductor current rises. When inductor current reaches upper threshold, the N-channel MOSFET is turned off, inductor is discharged, the energy stored in inductor is transferred to battery. When the inductor current is discharged to its lower threshold, the N-channel MOSFET is turned on again. When FB pin voltage reaches 1.205V(Typ.) for the first time, CN3305 enters quasi-CV mode, in which the charge current is reduced. The charge process will not be terminated until FB voltage reaches 1.205V for the second time. In termination mode, the N-channel MOSFET is turned off. When FB voltage falls below recharge threshold, the CN3305 enters charge mode again. CN3305’s switching frequency can be up to 1MHz, which makes a small-profile inductor usable. If battery voltage is lower than input voltage by a diode drop, CN3305 will increase the off time to 5us to reduce the charge current as a protection for battery with the joint action of external N-channel and P-channel MOSFET. The other features include status indication, etc. CN3305 is available in 8-pin SOP package. - Input Voltage Range：2.7V to 6.5V - Operating Current：280u A@VIN=5V - Suitable for Lithium-ion, Li Fe PO4 and Lead-Acid Batteries - Inductor Current Detection - Switching Frequency up to 1MHz - Quasi-CV mode to pensate for the Voltage Loss on Battery Internal Resistance and Trace Resistance - Automatic Recharge - Output Power up to 35W - Protection for Low Battery Voltage and Short Battery - Automatic Adaptability to Input Supply with Limited Driving Capability - Battery...