ISL6617A: PWM Doubler with Output Monitoring Feature

The ISL6617A utilizes Intersil’s proprietary Phase Doubler scheme to modulate two-phase power trains with single PWM input. It doubles the number of phases that 3.3V multiphase controllers can support.

The ISL6617A is designed to minimize the number of analog signals that interface between the controller and drivers in high phase count scalable applications. The common COMP signal, which is usually seen in conventional cascaded configurations, is not required; this improves noise immunity and simplifies the layout. Furthermore, the ISL6617A provides low part count and low cost advantage over the conventional cascaded technique.

By cascading the ISL6617A with another ISL6617 or ISL6611A, it can quadruple the number of phases that 3.3V multiphase controllers can support.

The ISL6617A also features tri-state input and outputs that recognize a high-impedance state, working together with Intersil multiphase PWM controllers and driver stages to prevent negative transients on the controlled output voltage when operation is suspended. This feature eliminates the need for the Schottky diode that may be utilized in a power system to protect the load from excessive negative output voltage damage.

Key Features
  • Proprietary phase doubler scheme
  • Enhanced light to full load efficiency
  • Double or quadruple phase count
  • Patented current balancing with DCR current sensing and adjustable gain
  • Current monitoring output (IOUT) to simplify system interface and layout
  • Triple-level enable input for mode selection
  • Dual PWM output drives for two synchronous rectified bridges with single PWM input
  • Channel synchronization and two interleaving options
  • Support 3.3V PWM input
  • Support 5V PWM output
  • Tri-state PWM input and outputs for output stage shutdown
  • Overvoltage protection
  • Dual flat no-lead (DFN) package
    • Near chip-scale package footprint; improves PCB utilization, thinner profile
    • Pb-free (RoHS compliant)
Applications
  • High current low voltage DC/DC converters
  • High frequency and high efficiency VRM and VRD
  • High phase count and phase shedding applications
  • 3.3V PWM input integrated power stage or DrMOS
Typical Diagram
Application Notes
TitleTypeUpdatedSizeOther Languages
AN1116: Elantec CMOS applicationsPDF13 Nov 2014231 KB
Datasheets
TitleTypeUpdatedSizeOther Languages
ISL6617A DatasheetPDF21 Dec 2016508 KB
Tech Briefs
TitleTypeUpdatedSizeOther Languages
TB363: Guidelines for Handling and Processing Moisture Sensitive Surface Mount Devices (SMDs)PDF13 Jan 201529 KB
White Papers
TitleTypeUpdatedSizeOther Languages
Five Easy Steps to Create a Multi-Load Power SolutionPDF30 Jan 2017502 KB
Order Information
Part NumberPackage TypeWeight(g)PinsMSL RatingPeak Temp (°C)RoHS Status
ISL6617AFRZ10 Ld DFN0.022103260RoHS
ISL6617AFRZ-T10 Ld DFN T+R0.022103260RoHS
ISL6617A Datasheet 21 Dec 2016
10 Ld DFN T+R ISL9203A
AN1116: Elantec CMOS applications 13 Nov 2014
TB363: Guidelines for Handling and Processing Moisture Sensitive Surface Mount Devices (SMDs) 13 Jan 2015
Five Easy Steps to Create a Multi-Load Power Solution 30 Jan 2017