Product Introduction

Product parameters

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

Opration Mode:Switch


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


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-CVTM) 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).


l  2-cell Li+ Battery Charging Management

l  Power Bank, POS, Electric Fan

l  Audio System

l  Standalone Charger


l  Input Voltage Range4.5V to 6.5V

l  Operating Current280uA@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

CN3312A/B/CB: 1.65A

CN3312A/B/CC: 1A

l  Switching Frequency up to 1MHz

l  Quasi-CV mode to Compensate for the Voltage Loss on Battery Internal Resistance and Trace Resistance

l  Automatic Recharge

l  JEITA-Compliant Battery Temperature Monitoring

l  Low Battery and Short Battery Protection

l  Automatic Adaptability to Input Supply with Limited Driving Capability

l  Chip Enable Input

l  Chip Over Temperature Protection

l  Battery Overvoltage Protection

l  Charge Status Indication

l  Operating Temperature :-40 to 85

l  Available in Thermally-Enhanced eSOP8 Package

l  Lead-free, rohs-Compliant and Halogen Free

Tools and Documents




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