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Data Sheet

1.2A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter AP3407/A

Dec. 2011 Rev. 1. 3 BCD Semiconductor Manufacturing Limited

General Description

The AP3407/A is a 1.4MHz fixed frequency, current

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

converter, capable of driving a 1.2A load with high

efficiency, excellent line and load regulation. The

device integrates synchronous P-channel and

N-channel power MOSFET switches with low

on-resistance. It is ideal for powering portable

equipment that runs from a single Li-ion battery.

A standard series of inductors are available from

several different manufacturers optimized for use

with the AP3407/A. This feature greatly simplifies

the design of switch-mode power supplies.

The AP3407/A is available in SOT-23-5.

Features

•

Input Voltage Range: 2.5V to 5.5V

• Output Voltage: 0.6V to V

• ADJ Output

• Fixed 1.4MHz Frequency

• High Efficiency up to 95%

• Output Current: 1.2A

• Current Mode Control

• 100% Duty Cycle in Dropout

• Built-in Over Current Protection

• Built-in Short Circuit Protection

• Built-in Thermal Shutdown Protection

• Built-in UVLO Function

• Built-in Soft-start

Applications

• Datacom

• Portable Device

• Smart Phone

Figure 1. Package Type of AP3407/A

SOT-23-5

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