MAXIM MAX1776EUA+T

The MAX1776 step-down converter is designed primarily for battery-powered devices and notebook computers. The unique current-limited control scheme provides high efficiency over a wide load range. Operation up to 100% duty cycle allows the lowest possible dropout voltage, increasing the usable supply voltage range. Under no load, the MAX1776 draws only 15μA, and in shutdown mode, it draws only 3μA to further reduce power consumption and extend battery life. Additionally, an internal 24V switching MOSFET, internal current sensing, and a high switching frequency minimize PC board space and component costs.

• The MAX1776 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 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.
• 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%
• 15μ Quiescent Supply Current
• 3μA Shutdown Current
• 100% Maximum Duty Cycle for Low Dropout
• Current-Limited Architecture
• Thermal Shutdown
• Small 8-µMAX Package

• Notebook Computers
• Distributed Power Systems
• Keep-Alive Supplies
• Hand-Held Devices