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6439CBZ - ISL6439CBZ

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Overview

® ISL6439, ISL6439A Data Sheet November 5, 2008 FN9057.5 Single Sync Buck PWM Controller for Broadband Gateway Applications The ISL6439 makes easy work out of implementing a complete control and protection scheme for a DC/DC step-down converter.

Designed to drive N-Channel MOSFETs in a synchronous buck topology, the ISL6439 integrates the control, output adjustment, monitoring and protection functions into a single package.

The ISL6439 provides simple, single feedback loop, voltagemode control with fast transient response.

Key Features

  • a 15MHz gain-bandwidth product and 6V/μs slew rate which enables high converter bandwidth for fast transient performance. The resulting PWM duty cycles range from 0% to 100%. Protection from overcurrent conditions is provided by monitoring the rDS(ON) of the upper MOSFET to inhibit PWM operation appropriately. This approach simplifies the implementation and improves efficiency by eliminating the need for a current sense resistor. Features.
  • Operates from 3.3V to 5V Input.
  • 0.8V.

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