General Description
The MAX1761 dual pulse-width-modulation (PWM), step-down controller provides high efficiency, excellent transient response, and high DC output accuracy in an extremely compact circuit topology. These features are essential for stepping down high-voltage batteries to generate low-voltage CPU core, I/O, and chipset RAM supplies in PC board area critical applications, such as notebook computers and smart phones.

Features
♦ Free-Running On-Demand PWM
♦ Selectable Light-Load Pulse-Skipping Operation
♦ ±1% Total DC Error in Forced-PWM Mode
♦ 5V to 20V Input Range
♦ Flexible Output Voltages
   OUT1: Dual Mode™ Fixed 2.5V or 1V to 5.5V
   Adjustable
   OUT2: Dual Mode Fixed 1.8V or 1V to 5.5V
   Adjustable
♦ Output Undervoltage Protection
♦ Complementary Synchronous Buck
♦ No Current-Sense Resistor
♦ 4.65V at 25mA Linear Regulator Output
♦ 4µA V+ Shutdown Supply Current
♦ 5µA VL Shutdown Supply Current
♦ 950µA Quiescent Supply Current
♦ Tiny 16-Pin QSOP Package

Applications
   Notebooks and PDAs
   Digital Cameras
   Handy-Terminals
   Smart Phones
   1.8V/2.5V Logic and I/O Supplies