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