Product Introduction

Product parameters

Funtion：PFM Step-up Battery Charger Controller IC

Opration Mode：Switch

Battery：Lithium-ion,LiFEPO4 and Lead-Acid Battery

Vin Range：4.5V to 28V

Operating Current：320uA

Solar Panel charge：No

Chip Temperature Regulation：No

Package：SOT23-6

Chip Enable：No

On-chip Power MOSFET：No

General Descriptions:

CN3300 is a PFM mode step-up battery charging controller IC with operating voltage range between 4.5V to 32V. CN3300 adopts trickle, constant current(CC) and quasi-constant voltage(Quasi-CV^TM) mode to charge battery, very suitable for Lithium, LiFePO4 and Lead-acid battery charging with fewer external components.

On power up, CN3300 enters charging mode, the external N-channel MOSFET is turned on, inductor current rises. When inductor current reaches upper limit, 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 limit, the N-channel MOSFET is turned on again, and so forth. When FB pin voltage reaches 1.205V(Typ.) for the first time, CN3300 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. If FB voltage falls below recharge threshold, CN3300 enters charge mode again. CN3300’s switching frequency can be up to 1MHz, which makes a small-profile inductor usable.

The other features include chip over temperature protection, battery over voltage protection, etc.

CN3300 is available in 6-pin SOT23 package.

Applications:

l Standalone Multi-cell Battery Charger

l Charging Management for Lithium, LiFePO4, Lead-acid Batteries

l Electrical ApplianceAudio Systems

Features:

l Input Voltage Range: 4.5V to 32V

l Automatically Adaptive to Input Supply’s Driving Capability

l Operating Current: 320uA@VIN=12V

l Inductor Current Sensing

l Switching Frequency: up to 1MHz