ISL9107 and ISL9108 are 1. 6MHz synchronous step-down regulators with integrated power switches capable of delivering 1. 5A output current, which is ideal for powering low-voltage microprocessors in compact devices such as PDAs and cellular phones. These devices are optimized for generating low output voltages down to 0. 8V. The supply voltage range is from 2. 7V to 5. 5V allowing for the use of a single Li+ cell, three NiMH cells or a regulated 5V input. 1. 6MHz pulse-width modulation (PWM) switching frequency allows using small external components. They have flexible operation mode selection of forced PWM mode and Skip (Low IQ) mode with typical 17µA quiescent current for highest light load efficiency to maximize battery life. The ISL9107 and ISL9108 integrate a pair of low ON-resistance P-Channel and N-Channel MOSFETs to maximize efficiency and minimize external component count. The ISL9107 offers a typical 215ms Power-Good (PG) timer when powered up. The timer output can be reset by RSI. When shutdown, ISL9107 and ISL9108 discharge the output capacitor. Other features include internal digital soft-start, enable for power sequence, overcurrent protection, and thermal shutdown. The ISL9107 and ISL9108 are offered in 8 Ld 2mmx3mm DFN package with 0. 9mm typical height. The complete converter can occupy less than 1cm2 area.


  • Integrated Synchronous Buck Regulator with up to 95% Efficiency
  • 2.7V to 5.5V Supply Voltage
  • 1.5A Guaranteed Output Current
  • 17µA Quiescent Supply Current in Skip (Low IQ) Mode
  • Selectable Forced PWM Mode and Skip Mode
  • Less Than 1µA Logic Controlled Shutdown Current
  • 100% Maximum Duty Cycle for Lowest Dropout
  • Discharge Output Capacitor when Shutdown
  • Internal Digital Soft-Start
  • Enable, Peak Current Limiting, Short Circuit Protection
  • Over-Temperature Protection
  • Power-Good Function (for ISL9107 only)
  • 8 Ld 2mmx3mm DFN
  • Pb-Free (RoHS Compliant)


  • Single Li-Ion Battery-Powered Equipment
  • DSP Core Power
  • PDAs and Palmtops

Product Options

Part Number Part Status Pkg. Type Carrier Type MOQ Buy Sample
Active DFN Reel 6000

Documentation & Downloads

Title Other Languages Type Format File Size Date
Datasheets & Errata
ISL9107, ISL9108 Datasheet Datasheet PDF 724 KB
User Guides & Manuals
ISL9107EVAL1Z, ISL9108EVAL1Z User Guide Manual PDF 317 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

Boards & Kits

Part Number Title Type Company
ISL9105EVAL1Z High-Efficiency Synchronous Buck Regulator Evaluation Board Evaluation Renesas
ISL9106EVAL1Z High-Efficiency Synchronous Buck Regulator Evaluation Board Evaluation Renesas
ISL9107EVAL1Z High-Efficiency Synchronous Buck Regulator Evaluation Board Evaluation Renesas
ISL9108EVAL1Z High-Efficiency Synchronous Buck Regulator Evaluation Board Evaluation Renesas