1-Cell to 3-Cell, High Power (1.5A), Low-Noise, Step-Up DC-DC Converter
Compact, High-Efficiency, Low-Noise Step-Up Converter with a Gain-Block
Power > Switching Regulators
Docket:19-1336; Rev 2; 11/98 NUAL
FOLLO 1-Cell to 3-Cell, High-Power (1.5A),
Low-Noise, Step-Up DC-DC Converter
____________________________Features The MAX1703 is a high-efficiency, low-noise, step-up
DC-DC converter intended for use in battery-powered
wireless applications. It uses a synchronous-rectified
pulse-width-modulation (PWM) boost topology to generate a 2.5V to 5.5V output from battery inputs, such as
one to three NiCd/NiMH cells or one Li-Ion cell. The
device includes a 2A, 75mâ„¦, N-channel MOSFET
switch and a 140mâ„¦, P-channel synchronous rectifier.
With its internal synchronous rectifier, the MAX1703
delivers up to 5% better efficiency than similar nonsynchronous converters. It also features a pulse-frequencymodulation (PFM) low-power mode to improve efficiency
at light loads, and a 1ÂµA shutdown mode.
The MAX1703 comes in a 16-pin narrow SO package
and includes an uncommitted comparator that generates
a power-good or low-battery-warning output. It also
contains a linear g...