Product Introduction

Product parameters

Funtion：PFM Step-up 2-cell Lithium Battery Charger IC With Built-in Current Sense Resistor

Opration Mode：Switch

Battery：Lithium-ion

Battery No.：2

Vout Range：0V-8.4V

Vin Range：4.3V - 6.5V

Operating Current：210uA@VIN=5V

Solar Panel charge：Yes

Chip Temperature Regulation：No

Package：SOP8

Chip Enable：No

On-chip Power MOSFET：No

General Description：

CN2X/CN2Y are PFM mode step-up battery charge management IC with operating voltage range between 4.3V to 6.5V. It is specially designed for 2-cell lithium battery charge management with fewer external components. CN2X/CN2Y adopts constant current and quasi-constant voltage (Quasi-CV^TM) mode to charge battery.

On power up, CN2X/CN2Y 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, 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 BAT pin voltage reaches 8.4V(Typ.) for the first time, CN2X/CN2Y 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 CN2X/CN2Y enters charge mode again. CN2X/CN2Y’s switching frequency can be up to 1MHz, which makes a small-profile inductor usable.

The other features include chip over temperature protection and status indication, etc.

CN2X/CN2Y is available in 8-pin SOP package.

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：4.3V to 6.5V

l Operating Current：210uA@VIN=5V

l Fixed Input Current: CN2X: 1.1A

CN2Y: 1.65A