NOTICE - The following device(s) are recommended alternatives:

The ISL85009 is a highly efficient, monolithic, synchronous buck regulator that can deliver 9A of continuous output current from a 3. 8V to 18V input supply. The device uses current mode control architecture with a fast transient response and excellent loop stability. The ISL85009 integrates very low ON-resistance high-side and low-side FETs to maximize efficiency and minimize external component count. The minimum BOM and easy layout footprint are extremely friendly to space constraint systems. The operation frequency of this device can be set using the FREQ pin: 600kHz (FREQ = float) and 300kHz (FREQ = GND). The device can also be synchronized to an external clock up to 1MHz. Both high-side and low-side MOSFET current limit along with reverse current limit, fully protect the regulator in an overcurrent event. Selectable OCP schemes can fit various applications. Other protections, such as input/output overvoltage and over-temperature, are also integrated into the device which give required system level safety in the event of fault conditions. The ISL85009 is offered in a space saving 15 Ld 3. 5mmx3. 5mm Pb-free TQFN package with great thermal performance and 0. 8mm maximum height.


  • Power input voltage range variable 3.8V to 18V
  • PWM output voltage adjustable from 0.6V
  • Up to 9A output load
  • Prebias start-up, fixed 3ms soft-start
  • Selectable fSW of 300kHz, 600kHz, and external synchronization up to 1MHz
  • Peak current mode control
  • Thermally compensated current limit
  • Internal/external compensation
  • Open-drain PG window comparator
  • Output overvoltage and thermal protection
  • Input overvoltage protection
  • Integrated boot diode with undervoltage detection
  • Selectable OCP schemes
  • Hiccup OCP
  • Latch-off
  • Compact size 3.5mmx3.5mm, 15 Ld TQFN


Title language Type Format File Size Date
star ISL85009 Datasheet Datasheet PDF 1.75 MB
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
ISL85009 iSim:PE Model Schematic SXSCH 218 KB
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


select_allSoftware & 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

memoryBoards & Kits

Part Number Title Type Company
ISL85009EVAL1Z 9A, 3.8V to 18V Input, Synchronous Buck Regulator Evaluation Board Evaluation Renesas
VERSALDEMO1Z Xilinx Versal ACAP Demonstration Board Demonstration Renesas