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

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

Product Options

Orderable Part ID Part Status Pkg. Type Carrier Type MOQ Buy Sample
Active QFN Tube 600
Availability
Active QFN Reel 6000
Availability
Active QFN Reel 250
Availability
Active QFN Tube 600
Availability
Active QFN Reel 6000
Availability
Active QFN Reel 250
Availability

Documentation & Downloads

Title Other Languages Type Format File Size Date
Datasheets & Errata
ISL9444 Datasheet Datasheet PDF 1.54 MB
User Guides & Manuals
ISL9444EVAL3Z User Guide Manual PDF 1.50 MB
ISL9444EVAL1Z User Guide Manual PDF 1.20 MB
Application Notes & White Papers
Five Easy Steps to Create a Multi-Load Power Solution White Paper PDF 846 KB
How Green is Your Cloud? White Paper PDF 295 KB
AN1681: Grounding Techniques Application Note PDF 509 KB
AN1684: Nonideality of Ground Application Note PDF 397 KB
Other
ISL9444EVAL3Z Design Files Design File ZIP 274 KB
ISL9444EVAL1Z Design Files Design File ZIP 274 KB
TB389: PCB Land Pattern Design and Surface Mount Guidelines for QFN Packages Other PDF 958 KB

Boards & Kits

Part Number Title Type Company
ISL9444EVAL1Z Triple, 180° Out-of-Phase, Synchronous Step-Down PWM Controller Evaluation Board Evaluation
ISL9444EVAL3Z Triple, 180° Out-of-Phase, Synchronous Step-Down PWM Controller Evaluation Board Evaluation