Diodes AP3427M Manual de usuario descargar pdf

Preliminary Datasheet

Dual 1A, 1.5MHZ Synchronous Step-down DC-DC Converter AP3427M

Mar. 2013 Rev. 1.0 BCD Semiconductor Manufacturing Limited

General Description

The AP3427M is a high efficiency step-down dual

channel DC-DC voltage converter. The chip

operation is optimized by peak-current mode

architecture with built-in synchronous power

MOSFET switchers. The oscillator and timing

capacitors are all built-in providing an internal

switching frequency of 1.5MHz 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

ranging from 0.6V to 0.9×V

when input voltage

range is from 2.5V to 5.5V, and is able to deliver up

to 1A.

The AP3427M is available in standard DFN-3×3-10

package.

Features

• High Efficiency Buck Power Converter

• Output Current: 1.0A

• Low R

DS(ON)

Internal Switches:200mΩ (V

=5V)

• Adjustable Output Voltage from 0.6V to 0.9×V

• Wide Operating Voltage Range: 2.5V to 5.5V

• Built-in Power Switches for Synchronous

Rectification with High Efficiency

• Feedback Voltage: 600mV

• 1.5MHz Constant Frequency Operation

• Thermal Shutdown Protection

• Low Drop-out Operation at 100% Duty Cycle

• Input Over Voltage Protection

• No Schottky Diode Required

Applications

• Post DC-DC Voltage Regulation

• PDA and Notebook Computer

Figure 1. Package Type of AP3427M

DFN-3×3-10

1 2 3 4 5 6 ... 10 11