General Description
The MAX1652–MAX1655 are high-efficiency, pulse-width-modulated (PWM), step-down DC-DC controllers in small QSOP packages. The MAX1653/MAX1655 also come in 16-pin narrow SO packages that are pin-compatible upgrades to the popular MAX797. Improvements include higher duty-cycle operation for better dropout, lower quiescent supply currents for better light-load efficiency, and an output voltage down to 1V (MAX1655).

Features
♦ 96% Efficiency
♦ Small, 16-Pin QSOP Package
   (half the size of a 16-pin narrow SO)
♦ Pin-Compatible with MAX797 (MAX1653/MAX1655)
♦ Output Voltage Down to 1V (MAX1655)
♦ 4.5V to 30V Input Range
♦ 99% Duty Cycle for Lower Dropout
♦ 170µA Quiescent Supply Current
♦ 3µA Logic-Controlled Shutdown
♦ Dual, N-Channel, Synchronous-Rectified Control
♦ Fixed 150kHz/300kHz PWM Switching,
   or Synchronized from 190kHz to 340kHz
♦ Programmable Soft Start
♦ Low-Cost Secondary Outputs (MAX1652/MAX1654)

Applications
   Notebook Computers
   PDAs
   Cellular Phones
   Hand-Held Computers
   Handy-Terminals
   Mobile Communicators
   Distributed Power