The ISL9103, ISL9103A is a 500mA, 2. 4MHz step-down regulator, which is ideal for powering low-voltage microprocessors in compact devices such as PDAs and cellular phones. It is optimized for generating low output voltages down to 0. 8V. The supply voltage range is from 2. 7V to 6V allowing the use of a single Li+ cell, three NiMH cells or a regulated 5V input. It has guaranteed minimum output current of 500mA. A high switching frequency of 2. 4MHz pulse-width modulation (PWM) allows using small external components. Under light load condition, the device operates at low IQ skip mode with typical 20µA quiescent current for highest light load efficiency to maximize battery life, and it automatically switches to fixed frequency PWM mode under heavy load condition. The ISL9103, ISL9103A includes a pair of low ON-resistance P-Channel and N-Channel internal MOSFETs to maximize system efficiency and minimize the external component count. 100% duty-cycle operation allows less than 300mV dropout voltage at 500mA. The ISL9103, ISL9103A offers internal digital soft-start, enable for power sequence, overcurrent protection and thermal shutdown functions. In addition, the ISL9103, ISL9103A offers a quick bleeding function that discharges the output capacitor when the IC is disabled. The ISL9103, ISL9103A is offered in a 1. 6x1. 6mm UTDFN package. The complete converter occupies less than 0. 5cm2.


  • High Efficiency Integrated Synchronous Buck Regulator with up to 95% Efficiency
  • 2.7V to 6.0V Supply Voltage
  • 2.4MHz PWM Switching Frequency
  • 500mA Guaranteed Output Current
  • 3% Output Accuracy Over-Temperature and Line for Fixed Output Options
  • 20µA Quiescent Supply Current in Skip Mode
  • Less than 1µA Logic Controlled Shutdown Current
  • 100% Maximum Duty Cycle for Lowest Dropout
  • Ultrasonic Switching Frequency at Skip Mode to Prevent Audible Frequency Noise (For ISL9103A Only)
  • Discharge Output Capacitor when Disabled
  • Internal Digital Soft-Start
  • Peak Current Limiting, Short Circuit Protection
  • Over-Temperature Protection
  • Chip Enable
  • Small 6 Pin 1.6mmx1.6mm UTDFN Package
  • Pb-Free (RoHS Compliant)


  • Single Li-ion Battery-Powered Equipment
  • Mobile Phones and MP3 Players
  • PDAs and Palmtops
  • WCDMA Handsets
  • Portable Instruments

Product Options

Part Number Part Status Pkg. Type Carrier Type MOQ Buy Sample
Active uTDFN Reel 3000
Active uTDFN Reel 3000
Active uTDFN Reel 3000
Active uTDFN Reel 3000
Active uTDFN Reel 3000
Active uTDFN Reel 3000
Active uTDFN Reel 3000

Documentation & Downloads

Title language Type Format File Size Date
Datasheets & Errata
ISL9103, ISL9103A Datasheet Datasheet PDF 744 KB
Application Notes & White Papers
Five Easy Steps to Create a Multi-Load Power Solution White Paper PDF 846 KB
AN9208: High Frequency Power Converters Application Note PDF 592 KB
AN1681: Grounding Techniques Application Note PDF 509 KB
AN1684: Nonideality of Ground Application Note PDF 397 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
PCN10114 - Part Marking Configuration Change for Intersil TDFN, uTDFN, and uTQFN Packaged Products Product Change Notice PDF 205 KB
ISL9103A 500mA 2.4MHz iSim:PE Model Schematic SXSCH 124 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