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