The ISL6549 provides the power control and protection for two output voltages in high-performance applications. The dual-output controller drives two N-Channel MOSFETs in a synchronous rectified buck converter topology and one N-Channel MOSFET in a linear configuration. The controller is ideal for applications where regulation of both the processing unit and memory supplies is required. The synchronous rectified buck converter incorporates simple, single feedback loop, voltage-mode control with fast transient response. Both the switching regulator and linear regulator provide a maximum static regulation tolerance of ±1% over line, load, and temperature ranges. Each output is user-adjustable by means of external resistors. An integrated soft-start feature brings both supplies into regulation in a controlled manner. Each output is monitored via the FB pins for undervoltage events. If either output drops below 75% of the nominal output level, both converters are shut off and go into retry mode. The ISL6549 is available in a 14 Ld SOIC package, 16 Ld QSOP, or 16 Ld 4x4 QFN packages.


  • Single 12V bias supply (no 5V supply is required)
  • Provides two regulated voltages
  • One synchronous rectified buck PWM controller
  • One linear controller
  • Both controllers drive low cost N-Channel MOSFETs
  • Small converter size
  • Adjustable frequency 150kHz to 1MHz
  • Small external component count
  • Excellent output voltage regulation
  • Both outputs: ±1% over temperature
  • 12V down conversion
  • PWM and linear output voltage range: down to 0.8V
  • Simple single-loop voltage-mode PWM control design
  • Fast PWM converter transient response
  • High-bandwidth error amplifier
  • Undervoltage fault monitoring on both outputs
  • Pb-free plus anneal available (RoHS compliant)


  • Processor and memory supplies
  • ASIC power supplies
  • Embedded processor and I/O supplies
  • DSP supplies

Product Options

Part Number Part Status Pkg. Type Carrier Type MOQ Buy Sample
Active SOICN Tube 500
Active SOICN Reel 2500
Active QFN Tube 75
Active QFN Reel 6000
Active QSOP Tube 98
Active QSOP Reel 2500


Title language Type Format File Size Date
Datasheets & Errata
ISL6549 Datasheet Datasheet PDF 884 KB
User Guides & Manuals
ISL6549xx-EVAL1 User Guide Manual PDF 1.19 MB
Application Notes & White Papers
AN1681: Grounding Techniques Application Note PDF 509 KB
AN1684: Nonideality of Ground Application Note PDF 397 KB
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
PCN20029A - Alternate bond wire material and assembly facility of the listed Renesas QFN packaged products Product Change Notice PDF 327 KB
PCN20017 - Alternate bond wire material and assembly facility of the listed Renesas nSOIC packaged products Product Change Notice PDF 266 KB
PCN13037 - Alternate Bond Wire Material for Assembly of the Listed Intersil QSOP Packaged Product Product Change Notice PDF 268 KB
PCN13013 - Test Site Change for the Listed Intersil Products - Carsem (CAS) Ipoh Malaysia Product Change Notice PDF 207 KB
PCN12068 - SOIC w/ Copper Bond Wire @ ASECL as Alternate Assembly Site Product Change Notice PDF 108 KB
TB363: Guidelines for Handling and Processing Moisture Sensitive Surface Mount Devices (SMDs) Other PDF 293 KB
PA16061 - Introduce New T-type End Plug for n-SOIC rail (packing tube) Product Advisory PDF 106 KB
ISL6549 iSim:PE Model Schematic SXSCH 131 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
ISL6549HI-EVAL1 Single 12V Input Supply Dual Regulator Evaluation Board Evaluation Renesas
ISL6549LOW-EVAL1 Single 12V Input Supply Dual Regulator Evaluation Board Evaluation Renesas