General Description

The APW7075 is a PWM/PFM, high-efficiency and step-upDC-DC converter with an integrated LDO input switch for dual mode application. During battery mode operation, the APW7075 acts as synchronous rectifier and step-up DC-DC converter with a fixed or adjustable output voltage. When the VIN pin sense 5V input voltage, the APW7075 is switched to LDO operation mode, maintainingthe constant output voltage.

The input voltage ranges from 0.6 V to 4.5V for step up DC-DC converter. The start-up is guaranteed at1V and the device is operating down to 0.6V. When the device is at LDO operating mode, the suitable output voltage 3.3V and loading current 500mA for maximum power consumption are guaranteed.

The APW7075 is suited for dual mode and portable battery powered appliance with low-battery detector. In dual-mode applications, theAPW7075 draws power from any available 5V USB connection and reverts to battery power when the USB power is removed.

特性 Features

? Built-In a 500mA LDO and Synchronous Step-Up DC-DCConverter

? Built-In PWM/PFM Operating Mode

? Provided Dual Input Power Sources

? Connect FB to OUT for 3.3V Output Voltage or GND for 2.5V Output Voltage or an External Resistor Divider for Adjustable Output Voltage.

? Fixed 300KHz Operating Frequency

? High Efficiency Up to 94 at 200mA Output Current

? 0.6V to 4.5V Operating Voltage

? 1V Start Up Input Voltage

? Low Battery Voltage Detection

? Reverse Voltage Protection

? Internal Synchronous Rectifier

? Automatic Detection Input Voltage

? Compact SOP-8-P and TSSOP-8 Packages

? Lead Free Available (RoHS Compliant)

Applications

? Dual Mode Power System

? USB Peripheral

? Camcorders andDigital Camera

? Hand-held Instrument

? PDAs