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Preliminary Datasheet

380kHz, 3A Asynchronous DC - DC Buck Converter AP3203

Mar. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited

General Description

The AP3203 is a 380kHz fixed frequency, current

mode, PWM buck (step-down) DC-DC converter,

capable of driving a 3A load with high efficiency,

excellent line and load regulation. The device

integrates N-channel power MOSFET switch with

low on-resistance. The current mode control provides

fast transient response and cycle-by-cycle current

limit.

A standard series of inductors are available from

several different manufacturers optimized for use

with the AP3203. This feature greatly simplifies the

design of switch-mode power supplies.

This IC is available in PSOP-8 package.

Features

• Input Voltage Range: 4.75V to 18V

• Fixed 380kHz Frequency

• High Efficiency: up to 93%

• Output Current: 3A

• Current Mode Control

• Built-in Over Current Protection

• Built-in Thermal Shutdown Function

• Built-in UVLO Function

• Built-in Over Voltage Protection

• Programmable Soft-start

Applications

• Portable DVD

• DPF

• LCD-TV

• STB

Figure 1. Package Type of AP3203

PSOP-8

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