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.

Features

  • 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

Product Options

Orderable Part ID Part Status Type Carrier Type Buy Sample
Active Tube
Availability
Active Reel
Availability
Active Reel
Availability
Active Reel
Availability

Documentation & Downloads

Title Other Languages Type Format File Size Date
Datasheets & Errata
ISL85003, ISL85003A Datasheet PDF 1.50 MB
ISL85003, ISL85003A Datasheet Datasheet PDF 1.52 MB
User Guides & Manuals
ISL85003DEMO1Z, ISL85003ADEMO1Z User Guide Manual PDF 348 KB
ISL85003EVAL2Z, ISL85003AEVAL2Z User Guide Manual PDF 530 KB
Application Notes & White Papers
Five Easy Steps to Create a Multi-Load Power Solution White Paper PDF 846 KB
How to Protect Buck Regulators from Overcurrent Damage White Paper PDF 378 KB
AN9208: High Frequency Power Converters Application Note PDF 592 KB
AN1965: Effectively Using the Intersil Small Form Factor Power Management Evaluation Boards Application Note PDF 2.35 MB
AN1684: Nonideality of Ground Application Note PDF 397 KB
AN1681: Grounding Techniques Application Note PDF 509 KB
AN9210: A New Pspice Subcircuit For The Power MOSFET Featuring Global Temperature Options Application Note PDF 650 KB
AN9209: A Spice-2 Subcircuit Representation For Power MOSFETs Using Empirical Methods Application Note PDF 387 KB
AN7244: Understanding Power MOSFETs Application Note PDF 349 KB
Other
ISL85003AEVAL2Z Design Files Design File ZIP 811 KB
ISL85003ADEMO1Z Design Files Design File ZIP 294 KB

Software / Tools

Title Type Description Company
iSim Design & Simulation Tool (Online Version) (Discontinued) Simulator iSim is an easy-to-use, interactive power management and op amp design tool that allows you to quickly select supporting components, build your schematic and validate your design. Renesas

Boards & Kits

Part Number Title Type Company
ISL85003ADEMO1Z Highly Efficient 3A Synchronous Buck Regulator Demonstration Boards Demonstration
ISL85003AEVAL2Z Highly Efficient 3A Synchronous Buck Regulator Evaluation Board Evaluation
ISL85003DEMO1Z Highly Efficient 3A Synchronous Buck Regulator Demonstration Boards Demonstration
ISL85003EVAL2Z Highly Efficient 3A Synchronous Buck Regulator Evaluation Board Evaluation