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Buck regulator suits small form factor apps

Posted: 24 Nov 2006     Print Version  Bookmark and Share

Keywords:Intersil  ISL65426  dual output  synchronous  buck regulator 

Intersil Corp. has introduced the ISL65426, a high-efficiency dual output synchronous buck regulator. This device integrates protection for two synchronous buck regulator channels in a thin QFN package, making it suitable for powering today's small form factor applications.

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

"Intersil's ISL65426 facilitates a quick power supply design through its unique architecture of six 1A user-configurable power blocks," said Sarika Arora, marketing manager for Intersil's Industrial and Communications Power products group. "With its ease of configurability, high integration and advanced monitoring and protection features, the ISL65426 represents a complete and compact power solution."

The ISL65426 is a high-efficiency dual output monolithic synchronous buck converter operating over an input voltage range of 2.375V to 5.5V. This single-chip power solution provides two output voltages which are selectable or externally adjustable from 1V to 80 per cent of the supply voltage while delivering up to 6A of total output current. The two pulse width modulators PWMs are synchronised 180° out of phase, reducing EMI and the root means square (RMS) current and ripple voltage thus reducing the size of input filter components.

The ISL65426's power block architecture allows partitioning of six 1A capable blocks to support one of four output configuration options (5A:1A; 4A:2A; 3A:3A; 2A:4A). 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. Proper external configuration of the power blocks is verified internally prior to soft-start initialisation.

Independent enable inputs allow for sequencing soft-start intervals of the two converter channels. A third enable input allows additional sequencing for multi-input bias supply designs. Individual power good indicators (PG1, PG2) signal when output voltage is within regulation window.

The ISL65426 integrates protection for both synchronous buck regulator channels. The fault conditions include overcurrent, undervoltage and IC thermal monitor. A thermally enhanced QFN package, the high 1MHz switching frequency and reduced BOM component count results in a compact power supply solution for the VCCINT and VCCIO supply rails of an FPGA or CPLD.

The ISL65426 is available now in a 50-lead QFN package and is priced at Rs.189.82 ($4.17) in 1,000-unit quantities.

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