MAXREFDES1139

Description

This reference design MAXREFDES1139 uses the MAX18066, which is a current-mode, synchronous, DC-DC buck converter which delivers an output current up to 4A with high efficiency. The MAXREFDES1139 operates from an input voltage of 10.8V to 13.2V and provides an output voltage of 5V. It features a pulse-width modulation (PWM) mode operation with an internally fixed switching frequency of 500kHz and automatically enters skip mode at light loads. The current-mode control architecture simplifies compensation design and ensures a cycle-by-cycle current limit and fast response to line and load transients. A high gain transconductance error amplifier allows flexibility in setting the external compensation. It has internal MOSFETs that provide better efficiency, minimize electromagnetic interference (EMI), reduce board space, and provide higher reliability. There are additional features which include an externally adjustable soft-start, independent enable input and power-good output for power sequencing. This reference design is ideal for distributed power systems, notebook computers, nonportable consumer applications, and pre-regulation applications.