Overview

Description

The ISL9444 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 ISL9444 offers independent power-good indicators, 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. Switching frequency can be set between 200kHz and 1200kHz using a resistor. The ISL9444 can be synchronized to another ISL9444 to reduce any beat frequency. The ISL9444 utilizes internal loop compensation to keep minimum peripheral components for a compact design and a low total solution cost. These devices are implemented with current mode control with feed-forward to cover various applications even with fixed internal compensations.

Features

  • Three Integrated Synchronous Buck PWM Controllers
  • Internal Bootstrap Diodes
  • Independent Programmable Output Voltage
  • Independent Power-Good Indicators, Soft-Starting and Tracking
  • Power Failure Monitor
  • 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 Current Sense Resistor
  • Uses Lower MOSFET's rDS(ON)
  • Complete Protection
  • Overcurrent, Overvoltage, Over-Temperature
  • Wide Input Voltage Range: 4.5V to 28V
  • Pb-Free (RoHS Compliant)

Applications

Applications

  • VoX Gateway Devices
  • NAS/SAN Devices
  • ATX Power Supplies

Documentation

Title Type Date
PDF1.54 MB
Datasheet
PDF509 KB
Application Note
PDF397 KB
Application Note
PDF603 KB
End Of Life Notice
PDF216 KB
End Of Life Notice
PDF179 KB
End Of Life Notice
PDF1.91 MB
Other
PDF52 KB
Product Advisory
PDF169 KB
Product Change Notice
PDF158 KB
Product Change Notice
PDF295 KB
White Paper

Design & Development

Software & Tools

Software & Tools

PowerCompass™ Multi-Rail Design ToolThe PowerCompass tool helps users quickly identify parts that match their specific requirements, set up multiple rails, perform high-level system analysis, and generate custom reference design files. Simulator Renesas

Software Downloads

Title Type Date
PDF603 KB
End Of Life Notice
PDF216 KB
End Of Life Notice
PDF179 KB
End Of Life Notice

Boards & Kits

Boards & Kits

Models

Support