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The ISL70003SEH is a radiation and SEE hardened synchronous buck regulator capable of operating over an input voltage range of 3. 0V to 13. 2V. With integrated MOSFETs, this highly efficient single chip power solution provides a tightly regulated output voltage that is externally adjustable from 0. 6V to ~90% of the input voltage. Continuous output load current capability is 6A for TJ ≤ +125°C and 3A for TJ ≤ +150°C. The ISL70003SEH uses voltage mode control architecture with feed-forward and switches at a selectable frequency of 500kHz or 300kHz. Loop compensation is externally adjustable to allow for an optimum balance between stability and output dynamic performance. The internal synchronous power switches are optimized for high efficiency and excellent thermal performance. The chip features two logic-level disable inputs that can be used to inhibit pulses on the phase (LXx) pins in order to maximize efficiency based on the load current. The ISL70003SEH also supports DDR applications and contains a buffer amplifier for generating the VREF voltage. High integration, best in class radiation performance and a feature-filled design make the ISL70003SEH an ideal choice to power many of todays small form-factor applications.


  • Acceptance tested to 50krad(Si) (LDR) wafer-by-wafer
  • ±1% reference voltage over line, temperature, and radiation
  • Integrated MOSFETs 31mΩ PFET/21mΩ NFET
  • 95% peak efficiency
  • Externally adjustable loop compensation
  • Supports DDR applications (VTT tracks VDDQ/2)
  • Buffer amplifier for generating VREF voltage
  • 3A current sinking capability
  • Grounded lid eliminates charge build up
  • IMON pin for output current monitoring
  • Adjustable analog soft-start
  • Diode emulation for increased efficiency at light loads
  • 500kHz or 300kHz operating frequency synch wording
  • Monotonic start-up into prebiased load
  • Full military temperature range operation
  • TA = -55°C to +125°C
  • TJ = -55°C to +150°C
  • Radiation tolerance
  • High dose rate (50-300rad(Si)/s): 100krad(Si)
  • Low dose rate (0.01rad(Si)/s): 100krad(Si)*
    * Limit established by characterization.
  • SEE hardness
  • SEB and SEL LETTH: 86.4MeV•cm2/mg
  • SET at LET 86.4MeV•cm2/mg: < ±3% ΔVOUT
  • SEFI LETTH: 60MeV•cm2/mg
  • Electrically screened to DLA SMD 5962-14203


  • FPGA, CPLD, DSP, CPU Core and I/O supply voltages
  • DDR memory supply voltages
  • Low-voltage, high-density distributed power systems

Product Options

Part Number Part Status Pkg. Type Carrier Type Buy Sample
Obsolete CQFP Tray
Obsolete CQFP Tray
Obsolete CQFP Tray
Obsolete CQFP Tray

Documentation & Downloads

Title language Type Format File Size Date
Datasheets & Errata
ISL70003SEH Datasheet Datasheet PDF 1.90 MB
User Guides & Manuals
ISL70003ASEHEVAL1Z User Guide Manual PDF 1.20 MB
Application Notes & White Papers
Using a Rad Hard Switching Regulator as a VTT Terminator in DDR Apps White Paper PDF 254 KB
Wafer by Wafer Low Dose Rate Acceptance White Paper White Paper PDF 533 KB
AN1947: Intersil's Radiation Hardened Low Power FPGA Power Solutions Application Note PDF 304 KB
AN1954: ISL70003SEH PSPICE Average Model Application Note PDF 312 KB
AN1915: ISL70003SEH iSim:PE Model Application Note PDF 583 KB
AN9867: End of Life Derating: A Necessity or Overkill Application Note PDF 338 KB
iSim:PE Software v8.40 Software EXE 157.43 MB
isl70003seh-pspice-files Model ZIP 76 KB
Intersil Space Products Brochure Brochure PDF 3.14 MB
ISL70003SEH iSim:PE Model Schematic SXSCH 319 KB
Standard Microcircuit Drawing 5962-14203 (ISL70003SEH, ISL70003ASEH) Other 0 KB
PLC17007A - Product Discontinuance / Obsolescence Notification - Correction Product Life Cycle Notice PDF 297 KB
PLC17007 - Q1 Cy 17 General Product Life Cycle Notice Product Life Cycle Notice PDF 292 KB
ISL70003SEH Neutron Test Report Report PDF 398 KB
ISL70003SEH SEE Test Report Report PDF 1.30 MB
Intersil Commercial Lab Services Brochure PDF 364 KB
TB499: PCB Thermal Land Design for Ceramic Packages with Bottom Metal or Heat Sinks Technical Brief PDF 410 KB
TB502: High Power ISL70003ASEH High Temperature Operating Life (HTOL) and Overcurrent Abuse Other PDF 212 KB
ISL70003SEH Total Dose Test Report Report PDF 485 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

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