Analog Devices MAX1776 Product Info

• 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

The MAX1776 high-efficiency step-down converter provides an adjustable output voltage from 1.25V to V_IN 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 MAX1776 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 MAX1776 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.

Applications

• Distributed Power Systems
• Handheld Devices
• Keep-Alive Supplies
• Notebook Computers