High efficiency dual output synchronous buck converter

2 May 2007 Power Electronics / Power Management

Intersil’s ISL65426 is a high efficiency dual output monolithic synchronous buck converter operating over an input voltage range of 2,375 V to 5,5 V. This single chip power solution provides two output voltages that are selectable or externally adjustable from 1 V to 80% of the supply voltage while delivering up to 6 A of total output current. The two PWMs are synchronised 180° out of phase reducing the RMS input current and ripple voltage.

The ISL65426 switches at a fixed frequency of 1 MHz and uses current-mode control with integrated compensation to minimise the size and number of external components and provide superior transient response. The internal synchronous power switches are optimised for good thermal performance, high efficiency, and eliminate the need for an external Schottky diode

A unique power block architecture allows partitioning of six 1 A capable blocks to support one of four configuration options. One master power block is associated with each synchronous converter channel. Four floating slave power blocks allow the user to assign them to either channel.

Independent enable inputs allow for synchronisation or sequencing soft-start intervals of the two converter channels. A third enable input allows additional sequencing for multi-input bias supply designs.

The ISL65426 integrates protection for both synchronous buck regulator channels. The fault conditions include overcurrent, undervoltage, and IC thermal monitor.

The device's thin quad flat no-lead (QFN) package makes it suited for many of today's small form factor applications.

For more information contact Andrew Athanasiou, Arrow Altech Distribution, [email protected], +27 (0)21 555 1884.

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