General Description

The MAX1700/MAX1701 are high-efficiency, low-noise, step-up DC-DC converters intended for use in battery powered wireless applications. They use a synchronous-rectified pulse-width-modulation (PWM) boost topology to generate 2.5V to 5.5V outputs from battery inputs such as one to three NiCd/NiMH cells or one Li-Ion cell. Both devices have an internal 1A, 130mΩ N-channel MOSFET switch and a 250mΩ P-channel synchronous rectifier.

Features

♦ Up to 96 Efficiency

♦ 1.1 VIN Guaranteed Start-Up

♦ 0.7V to 5.5V Input Range

♦ Up to 800mA Output

♦ Step-Up Output (adjustable from 2.5V to 5.5V)

♦ PWM/PFM Synchronous-Rectified Topology

♦ External Clock or Internal 300kHz Oscillator

♦ 3µA Logic-Controlled Shutdown

♦ Power-Good Output (MAX1701)

♦ Low-Battery Comparator (MAX1701)

♦ Uncommitted Gain Block (MAX1701)

Applications

Digital Cordless Phones

Personal Communicators

PCS Phones

Palmtop Computers

Wireless Handsets

Hand-Held Instruments

Two-Way Pagers