Product Introduction

Product parameters

Funtion：4A, 5-cell Lithium-ion Battery Charger IC With Photovoltaic Cell MPPT Function

Opration Mode：Switch

Battery：5 cell li-ion battery

Battery No.：5

Vout Range：0V-21V

Vin Range：6.5V-32V

Max Charge Current：4A

Operating Current：635uA

Solar Panel charge：YES

Chip Temperature Regulation：YES

Package：eSSOP10

Switching Frequency：550kHz

Chip Enable：No

On-chip Power MOSFET：No

General Description:

CN3865 is a PWM switch-mode charger controller IC for 5-cell lithium-ion batteries with few external components in small footprint package.

The CN3865 is specially designed for charging 5-cell lithium ion batteries with trickle charge, constant current and constant voltage mode. In constant voltage mode, the regulation voltage is fixed at 21V with 1% accuracy. The constant charging current is set with an external current sense resistor.

When photovoltaic cell is used as power supply, CN3865 can automatically adjust charge current to track solar panel’s maximum power point.

Deeply discharged batteries are automatically trickle charged at 25% of the programmed constant charging current until the cell voltage exceeds 66.6% of regulation voltage. The charge cycle is terminated once the charging current drops to 15% of full-scale current, and a new charge cycle automatically restarts if battery voltage falls below 95.8% of regulation voltage. CN3865 will automatically enter sleep mode when input voltage is lower than battery voltage.

Other features include JEITA-compliant battery temperature monitoring, under voltage lockout, battery over voltage protection, 2 open-drain status indications, etc.

CN3865 is available in thermally-enhanced 10-pin SSOP package.

Applications:

l Electric Tools

l Emergency Lighting

l Industrial and Medical Equipment

l Standalone Charging Management

Features:

l Photovoltaic Cell Maximum Power Point Tracking

l Standalone Charge Management for 5-cell Lithium-ion Battery

l Wide Input Voltage: 6.5V to 32V

l Charge Current up to 4A

l PWM Switching Frequency: 550KHz