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Preliminary Datasheet

2A, 4MHz High Efficiency Synchronous Buck Converter AP3408

Jan. 2013 Rev. 1. 1

BCD Semiconductor Manufacturing Limited

General Description

The AP3408 is a current mode, PWM synchronous

buck DC/DC converter, capable of driving a 2A load

with high efficiency, excellent line and load

regulation. It operates in continuous PWM mode.

The AP3408 integrates synchronous P-channel and

N-channel power MOSFET switches with low

on-resistance. It is ideal for portable applications

powered from a single Li-ion battery. 100% duty

cycle and low on-resistance P-channel internal power

MOSFET can maximize the battery life.

The switching frequency of AP3408 can be

programmable from 300kHz to 4MHz, which allows

small-sized components, such as capacitors

and

inductors

A standard series of inductors from several

different manufacturers are available. This feature

greatly simplifies the design of switch-mode power

supplies.

The AP3408 is available in DFN-3×3-10 and PSOP-8

packages.

Features

•

Input Voltage Range: 2.6 to 5.5V

• Adjustable Output from 0.8 to 5V

• 0.8V Reference Voltage with ± 2% Precision

• Output Current: 2A

• High Efficiency up to 95%

• Low R

DSON

Internal Switches

• Programmable Frequency: 300kHz to 4MHz

• Current Mode Control

• Forced Continuous-mode Operation

• 100% Duty Cycle

• Synchronizable Switching Frequency

•

Power Good Output Voltage Monitoring

• Built-in Soft-start

• Built-in Short Circuit Protection

• Built-in Thermal Shutdown Protection

• Built-in Current Limit Function

Applications

• Portable Media Player

• Digital Still and Video Cameras

• Notebook

Figure 1. Package Types of AP3408

DFN-3×3-10 PSOP-8

1 2 3 4 5 6 ... 11 12