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Data Sheet

1.0MHz, 2.0A, Synchronous Step Down DC-DC Converter AP3431

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

General Description

The AP3431 is a high efficiency step-down DC-DC

voltage converter. The chip operation is optimized

by peak-current mode architecture with built-in

synchronous power MOS switchers. The oscillator

and timing capacitors are all built-in providing an

internal switching frequency of 1MHz that allows

the use of small surface mount inductors and

capacitors for portable product implementations.

Integrated Soft Start (SS), Under Voltage Lock Out

(UVLO), Thermal Shutdown Detection (TSD) and

short circuit protection are designed to provide

reliable product applications.

The device is available in adjustable output voltage

versions ranging from 0.8V to 0.9

when input

voltage range is from 2.7V to 5.5V , and is able to

deliver up to 2.0A.

The AP3431 is available in SOIC-8 package.

Features

• High Efficiency Buck Power Converter

• Output Current: 2A

• Low R

DS(ON)

Internal Switches : 120mΩ(V

=5V)

• Adjustable Output Voltage from 0.8V to 0.9×V

• Wide Operating Voltage Range: 2.7V to 5.5V

•

Built-in Power Switches for Synchronous

Rectification with High Efficiency

• Feedback Voltage: 800mV

• Switching Frequency: 1.0MHz

• Thermal Shutdown Protection

• Internal Soft Start

Applications

• LCD TV

• Set Top Box

• Post DC-DC Voltage Regulation

• PDA and Notebook Computer

Figure 1. Package Type of AP3431

SOIC-8

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