The ISL9440B and ISL9440C are quad-output synchronous buck controllers that integrate three PWM controllers and one low drop-out linear regulator controller, which are full 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. 8V. The PWMs are synchronized at 180° out-of-phase thus, reducing the RMS input current and ripple voltage. The ISL9440B and ISL9440C offer programmable soft-start, independent enable inputs for ease of supply rail sequencing, and integrated UV/OV/OC/OT protections in a space conscious 5mmx5mm QFN package. An early warning function is offered to output a logic signal to warn the system to back up data when input voltage falls below a certain level. The ISL9440B and ISL9440C utilize internal loop compensation to keep minimum peripheral components for 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
  • Internal Compensation
  • Independent Control for each Regulator and Programmable Output Voltages; Independent Enable/Shutdown/Soft-start
  • Fixed Switching Frequency: 300kHz(B), 600kHz(C)
  • Adaptive Shoot-Through Protection on all Synchronous Buck Controllers
  • Pre-biased Output Start-up Capability
  • Out-of-Phase Switching to Reduce Input Capacitance (0°/180°/0°)
  • No External Current Sense Resistor
  • Uses Lower MOSFET's rDS(ON)
  • Current Mode Controller with Voltage Feed-Forward
  • Complete Protection
  • Overcurrent, Overvoltage, Undervoltage Lockout, Over-Temperature
  • Cycle-by-Cycle Current Limiting
  • Wide Input Voltage Range
  • Input Rail Powers VIN Pin: 5.6V to 24V
  • Input Rail Powers VCC_5V Pin (VIN tied to VCC_5V, for 5V input applications): 4.5V to 5.6V
  • Early Warning on Input Voltage Failure
  • Integrated Reset Function
  • Pb-Free (RoHS Compliant)

Applications

  • Satellite and Cable Set-Top Boxes
  • Cable Modems
  • VoX Gateway Devices
  • NAS/SAN Devices
  • ATX Power Supply

Product Options

Part Number Part Status Pkg. Type Carrier Type MOQ Buy Sample
Active QFN Tube 60
Availability
Active QFN Reel 6000
Availability

Documentation & Downloads

Title Other Languages Type Format File Size Date
Datasheets & Errata
ISL9440B, ISL9440C Datasheet Datasheet PDF 2.17 MB
User Guides & Manuals
ISL9440BEVAL1Z User Guide Manual PDF 1.23 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
PCNs & PDNs
PCN13025 - Alternate Bond Wire Material and Manufacturing Facilities for Assembly of the Listed Intersil DFN/QFN Packaged Products - Advanced Semiconductor Engineering (ASECL) - Chung-Li , Taiwan and STATS ChipPAC (SCM) - Kuala Lumpur, Mal Product Change Notice PDF 106 KB
PCN13009 - Alternate Bond Wire Material and Manufacturing Facilities for Assembly of the Listed Intersil DFN/QFN Packaged Products - Advanced Semiconductor Engineering (ASECL) - Chung-Li (ASECL), Taiwan and STATS ChipPAC (SCM) - Kuala Lump Product Change Notice PDF 173 KB
PCN10055 - Alternate Bond Wire Material for Assembly of the Listed Intersil DFN/QFN Packaged Products - STATS ChipPAC Malaysia Product Change Notice PDF 248 KB
Downloads
ISL9440xEVAL1Z Design Files Design File ZIP 274 KB
Other
TB389: PCB Land Pattern Design and Surface Mount Guidelines for QFN Packages Other PDF 958 KB

Software & Tool Pages

Title Type Description Company
iSim:PE Offline Simulation Tool Simulator iSim Personal Edition (iSim:PE) speeds the design cycle and reduces risk early in any project, identifying parts that can be used in current as well as next-generation designs. Renesas

Boards & Kits

Part Number Title Type Company
ISL9440BEVAL1Z Triple, 180° Out-of-Phase, Step-Down PWM and Single Linear Controller Evaluation Board Evaluation Renesas