General Description

The MAX1765 is a high-efficiency, low-noise, step-up DC-DC converter intended for use in battery-powered wireless applications. This device operates at a high 1MHz fixed frequency while maintaining an exceptionally low quiescent supply current (200µA). Its small external components and tiny package make this device an excellent choice for small hand-held applications that require the longest possible battery life.

Features

♦ High-Efficiency Step-Up Converter

Up to 93 Efficiency

Adjustable Output from +2.5V to +5.5V

Up to 800mA Output

PWM Synchronous-Rectified Topology

1MHz Operating Frequency (or Sync)

♦ LDO Linear Regulator

500mA LDO Linear Regulator

2.85V Linear Regulator Output or Adjustable

(1.25V to 5V)

Low 125mV Dropout at 500mA

♦ +0.7V to +5.5V Input Range

♦ 0.1μA Logic-Controlled Shutdown

♦ Adjustable Inductor Current Limit and Soft-Start

♦ Thermal Shutdown

♦ 1.5W, 16-Pin TSSOP-EP Package Available

Applications

Wireless Handsets

PCS Phones

Palmtop Computers

Personal Communicators

Hand-Held Instruments

Portable Audio Players