MAXREFDES1127

描述

The MAXREFDES1127 demonstrates how to build a DC-DC buck converter using the MAX18066 for 2.5V DC output applications from a 10.8V to 13.2V input. This reference design delivers up to 3A at 2.5V output. This design uses a two-layer board.

The MAX18066 current-mode, synchronous, DC-DC buck converters deliver an output current up to 4A with high efficiency. The devices operate from an input voltage of 4.5V to 16V and provide an adjustable output voltage from 0.606V to 90% of the input voltage. The devices are ideal for distributed power systems, notebook computers, non-portable consumer.

The devices feature a pulse-width modulation (PWM) mode operation with an internally fixed switching frequency of 500kHz capable of 90% maximum duty cycle. The devices automatically enter 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. Additional features include an externally adjustable soft-start, independent enable input and power-good output for power sequencing, and thermal shutdown protection. The devices offer overcurrent protection (high side sourcing) with hiccup mode during an output short-circuit condition. The devices ensure safe startup when powering into a pre-biased output.