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ISL9443 - Synchronous Step-Down PWM Controller

General Description

PIN 1 2 NAME ISEN1 VCC_5V FUNCTION Current signal input for PWM1.

This pin is used to monitor the voltage drop across the lower MOSFET for current loop feedback and overcurrent protection.

Output of the internal 5V linear regulator.

Key Features

  • Three Integrated Synchronous Buck PWM Controllers - Internal Bootstrap Diodes - Independent Programmable Output Voltage - Independent Soft-Starting and Tracking.
  • Power-Good Indicator.
  • Light Load Efficiency Enhancement - Low Ripple Diode Emulation Mode with Pulse Skipping.
  • Supports Pre-Biased Output.
  • Programmable Frequency: 200kHz to 1200kHz.
  • Adaptive Shoot-Through Protection.
  • Out-of-Phase Switching (0°/180°/0°).
  • No External.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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Triple, 180° Out-of-Phase, Synchronous Step-Down PWM Controller ISL9443 The ISL9443 is a triple-output synchronous buck controller that integrates three PWM controllers which are fully featured and designed to provide multi-rail power for use in products such as cable and satellite set-top boxes, VoIP gateways, cable modems, and other home connectivity products as well as a variety of industrial and general purpose applications. Each output is adjustable down to 0.7V. The PWMs are synchronized at 180° out-of-phase, thus reducing the input RMS current and ripple voltage. The ISL9443 offers programmable soft-start and tracking functions for ease of supply rail sequencing and integrated UV/OV/OC/OT protections in a space conscious 5mmx5mm QFN package.