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