Overview

The ISL85003 and ISL85003A are synchronous buck regulators with integrated high-side and low-side FETs. The regulator can operate from an input voltage range of 4. 5V to 18V while delivering a very efficient continuous 3A current. This is all delivered in a very compact 3mmx4mm DFN package. The ISL85003 is designed on Intersil’s proprietary fab process that is designed to deliver very low rDS(ON) FETs with an optimized current mode controller wrapped around it. The high-side NFET is designed to have an rDS(ON) of 65mΩ while the low-side NFET is designed to have an rDS(ON) of 45mΩ. With these two FETs, the device delivers very high efficiency power to the load. The ISL85003 can automatically switch between DCM and CCM for light-load efficiency in DCM. The switching frequency in CCM is internally set to 500kHz. The device provides a maximum static regulation tolerance of ±1% over wide line, load and temperature ranges. The output is user adjustable, with external resistors, down to 0. 8V. Pulling EN above 0. 6V enables the controller. The regulator supports prebiased output. Fault protection is provided by internal current limiting during positive or negative overcurrent conditions, output and input under and overvoltage detection and an over-temperature monitoring circuit.

ISL85003_ISL85003A Functional Diagram
ISL85003_ISL85003A Functional Diagram
  • Input voltage range 4.5V to 18V
  • Output voltage adjustable from 0.8V, ±1%
  • Efficiency up to 95%
  • Integrated boot diode with undervoltage detection
  • Current mode control
  • DCM/CCM
  • Internal or external compensation options
  • 500kHz switching frequency option
  • External synchronization up to 2MHz on ISL85003
  • Adjustable soft-start time on the ISL85003A
  • Open-drain PG window comparator
  • Built-in protection
  • Positive and negative overcurrent protection
  • Overvoltage and thermal protection
  • Input overvoltage protection
  • Small 12 Ld 3mmx4mm Dual Flat No-Lead (DFN) package

Applications

  • Network and communication equipment
  • Industrial process control
  • Multi function printers
  • Point of load regulators
  • Standard 12V rail supplies
  • Embedded computing

Documentation

= Featured Documentation
Type Title Date
Datasheet
ISL85003, ISL85003A Datasheet
PDF 5.21 MB
White Paper
How to Protect Buck Regulators from Overcurrent Damage
PDF 378 KB
Application Note
AN9208: High Frequency Power Converters
PDF 592 KB
Application Note
AN1965: Effectively Using the Intersil Small Form Factor Power Management Evaluation Boards
PDF 2.35 MB
Application Note
AN1681: Grounding Techniques
PDF 509 KB
Application Note
AN1684: Nonideality of Ground
PDF 397 KB
Application Note
AN9210: A New Pspice Subcircuit For The Power MOSFET Featuring Global Temperature Options
PDF 650 KB
Application Note
AN9209: A Spice-2 Subcircuit Representation For Power MOSFETs Using Empirical Methods
PDF 387 KB
Application Note
AN7244: Understanding Power MOSFETs
PDF 349 KB
9 items

Design & Development

Software & Tools
iSim:PE Offline Simulation Tool
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.
Downloads
ISL85003A iSim:PE Model
 Simulator Renesas
1 item
ISL85003ADEMO1Z Buck Regulator Demonstration Board Top

ISL85003ADEMO1Z

Demonstration
Learn More

Highly Efficient 3A Synchronous Buck Regulator Demonstration Boards

The ISL85003ADEMO1Z demonstration board is intended for use in point-of-load applications sourcing from 4.5V to 18V. The board is used to demonstrate the performance of...

Featured Documents:
ISL85003DEMO1Z, ISL85003ADEMO1Z User Guide
ISL85003AEVAL2Z Buck Regulator Evaluation Board Top

ISL85003AEVAL2Z

Evaluation
Learn More

Highly Efficient 3A Synchronous Buck Regulator Evaluation Board

The ISL85003AEVAL2Z evaluation kit is intended for use in point-of-load applications sourcing from 4.5V to 18V. The kit is used to demonstrate the performance of the

Featured Documents:
ISL85003EVAL2Z, ISL85003AEVAL2Z User Guide

ECAD Models

Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.

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Diagram of ECAD Models

Product Options

    Processing table
    Pkg. Type
    Carrier Type
    Moisture Sensitivity Level (MSL)
    Price (USD) | 1ku
    Buy / Sample
    Part Number
    ISL85003AFRZ
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    Samples Available
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    		DFN Tube 3 0.9613 Get Samples,
    ISL85003AFRZ-T
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    		DFN Reel 3
    ISL85003AFRZ-TK
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    Samples Available
    		 DFN Reel 3 Get Samples,
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