Product Introduction

Product parameters

Funtion：PFM Step-up 2-cell Lithium Battery Charger IC

Opration Mode：Switch

Battery：Lithium-ion

Battery No.：2

Vout Range：0V-8.4V

Vin Range：4.5V - 6.5V

Operating Current：280uA@VIN=5V

Solar Panel charge：Yes

Chip Temperature Regulation：No

Package：eSOP8

Max Output Power：5W

Chip Enable：Yes

On-chip Power MOSFET：PMOS On-chip

General Description：

CN3312A/B/C are PFM mode step-up battery charge management ICs with operating voltage range between 4.5V to 6.5V. It is specially designed for 2-cell lithium battery charge management with fewer external components. CN3312A/B/C adopts constant current and quasi-constant voltage(Quasi-CV^TM) mode to charge battery.

On power up, CN3312A/B/C enters charging state, the external N-channel MOSFET is turned on, inductor current rises. When inductor current reaches upper threshold, the N-channel MOSFET is turned off, 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 BAT pin voltage reaches 8.4V(Typ.) for the first time, CN3312A/B/C enters quasi-CV mode, in which the charge current is reduced. The charge process will not be terminated until BAT voltage reaches 8.4V for the second time. In termination mode, the N-channel MOSFET is turned off. When BAT voltage falls below recharge threshold, the CN3312A/B/C enters charge mode again. CN3312A/B/C’s switching frequency can be up to 1MHz, which makes a small-profile inductor usable.

The other features include chip enable input, chip over temperature protection, JEITA-compliant battery temperature monitoring, low battery protection and charge status indication, etc.

CN3312A/B/C is available in thermally-enhanced 8-pin SOP package(eSOP8).

Applications:

l 2-cell Li+ Battery Charging Management

l Power Bank, POS, Electric Fan

l Audio System

l Standalone Charger

Features：

l Input Voltage Range：4.5V to 6.5V

l Operating Current：280uA@VIN=5V

l Can be Powered by Solar-panel

l No Need for External Current Sense Resistor. Fixed Inductor Current:

CN3312A/B/CA: 2.65A