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A4403 - Valley Current Mode Control Buck Converter

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General Description

The A4403 is a buck converter that uses valley current-mode control.

This control scheme allows very short switch on-times to be achieved, making it ideal for applications that require high switching frequencies combined with high input voltages and low output voltages.

Low cost is accomplished through high switching frequencies of up to 2 MHz, allowing smaller and lower value inductors and capacitors.

Overview

A4403 Valley Current Mode Control Buck Converter.

Key Features

  • Extremely fast load-transient response with minimal output voltage delta.
  • Achieves high step-down ratios with on-times < 50 ns.
  • User-configurable on-time, achieving switching frequencies up to 2 MHz.
  • Minimal external components required.
  • Optimized for low value filter capacitors and inductors.
  • Wide input voltage range: 9 to 46 V.
  • Output Current: 3 A.
  • Low standby current.

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