The MAX1776EUA high-efficiency step-down converter provides an adjustable output voltage from 1.25V to VIN from supply voltages as high as 24V. An internal current-limited 0.4Ω MOSFET delivers load currents up to 600mA. Operation to 100% duty cycle minimizes dropout voltage (240mV at 600mA). The MAX1776EUA has a low 15μA quiescent current to improve light-load efficiency and conserve battery life. The device draws only 3μA while in shutdown. High switching frequencies (up to 200kHz) allow the use of tiny surface-mount inductors and output capacitors. The MAX1776EUA is available in an 8-pin μMAX package, which uses half the space of an 8-pin SO. For increased output drive capability, use the MAX1626/ MAX1627 step-down controllers, which drive an external P-channel MOSFET to deliver up to 20W. 
  
 
Feature
 
 
  
  -  Fixed 5V or Adjustable Output 
 
  -  4.5V to 24V Input Voltage Range 
 
  -  Up to 600mA Output Current 
 
  -  Internal 0.4Ω P-Channel MOSFET 
 
  -  Efficiency Over 95% 
 
  -  15μA Quiescent Supply Current 
 
  -  3μA Shutdown Current 
 
  -  100% Maximum Duty Cycle for Low Dropout 
 
  -  Current-Limited Architecture 
 
  -  Thermal Shutdown 
 
  -  Small 8-μMAX Package 
 
 
 
  
Applications
 
 
 
  - Distributed Power Systems
 
  - Handheld Devices
 
  - Keep-Alive Supplies
 
  - Notebook Computers