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Data Sheet

1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406A

Feb. 2013 Rev. 1. 5 BCD Semiconductor Manufacturing Limited

General Description

The AP3406A is a 1.1MHz fixed frequency, current

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

converter, capable of driving a 800mA load with high

efficiency, excellent line and load regulation. The

device integrates a main switch and a synchronous

switch without an external Schottky diode. 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 AP3406A. This feature greatly simplifies the

design of switch-mode power supplies.

This IC is available in TSOT-23-5, MSOP-10 and

DFN-2×2-6(1) packages.

Features

•

High Efficiency: up to 95%

• Output Current: 800mA

• Input Voltage Range: 2.5V to 5.5V

• Fixed 1.1MHz Frequency

• Current Mode Control

• 100% Duty Cycle in Dropout

• Built-in Short Circuit Protection

• Built-in Thermal Shutdown Function

• Built-in Current Limit Function

• Shutdown Current: <1µA

Applications

• GPS

• WiFi Card

• Portable Media Player

• Digital Still and Video Cameras

Figure 1. Package Types of AP3406A

TSOT-23-5 MSOP-10 DFN-2×2-6(1)

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