Radiation Hardened Low Dropout Adjustable Negative Voltage Regulator The radiation hardened ISL72991RH is a low dropout adjustable negative regulator with an output voltage range of -2.25V to -26V. The device features a 1A output current capability, an adjustable current limit pin (ILIM), and a shutdown pin (SD) for easy on/off control. The device incorporates unique circuitry that enables precision performance across the -55°C to +125°C temperature range and post-irradiation. Specifications across the full temperature range include an internal reference voltage of -1.25V +40mV/- 50mV (maximum), line regulation of ±25mV (maximum), and load regulation of ±15mV (maximum). The reference voltage is the ADJ to GND voltage. Constructed with the Intersil dielectrically isolated Rad Hard Silicon Gate (RSG) BiCMOS process, these devices are immune to single event latch-up and have been specifically designed to provide highly reliable performance in harsh radiation environments.


  • Electrically screened to DLA 5962-02503
  • QML qualified per MIL-PRF-38535 requirements
  • Latch-up immune DI process
  • Wide input voltage range: -3V to -30V
  • Nominal output voltage range: -2.25V to -26V
  • Line regulation: ±25mV (maximum)
  • Load regulation: ±12mV (typ); ±15mV (maximum)
  • Dropout voltage (100mA): 0.2V (typ); 0.3V (maximum)
  • Dropout voltage (1A): 1V (maximum)
  • Minimum load current: 3.0mA
  • TTL input-level shutdown (SD); low = on
  • Operating temperature range: -55°C to +125°C
  • Radiation environment
  • SEL/SEB LETTH (VS = -30V): 86.4MeV•cm2/mg
  • Total dose, high dose rate: 300krad(Si)


  • Post Switching Power Supplies
  • DC/DC Converters
  • Motor Controllers

tuneProduct Options

Part Number Part Status Pkg. Type Carrier Type MOQ DLA SMD Buy Sample
Active CFP Tray 1
Active CFP Tray 1 5962F0250301QXC
Active CFP Tray 1 5962F0250301VXC
Active 100 5962F0250301V9A
Active CFP Tray 1 5962F0250301QXC
Active DIE 5 5962F0250301QXC


Title language Type Format File Size Date
Datasheets & Errata
star ISL72991RH Datasheet Datasheet PDF 550 KB
User Guides & Manuals
ISL72991RHEVAL2Z User Guide Manual - Development Tools PDF 506 KB
Application Notes & White Papers
R34AN0003EU: ISL72991RH PSpice Simulation Results Rev.1.00 Application Note PDF 1.65 MB
Wafer by Wafer Low Dose Rate Acceptance White Paper White Paper PDF 533 KB
AN9867: End of Life Derating: A Necessity or Overkill Application Note PDF 338 KB
PCN20014 - Package change for ISL72991* products Product Change Notice PDF 393 KB
PA11003 - Packing Method Change for Intersil TO-xx Metal Can and Flat Pack Packaged Products Product Advisory PDF 499 KB
PCN10123 - Alternate Die Attach Material for Assembly of Intersil Hermetic Packaged Products - Intersil Palm Bay, FL. (ISP) Product Change Notice PDF 230 KB
Intersil Space Products Brochure Brochure PDF 3.12 MB
ISL72991RH Total Dose Test Report Report PDF 321 KB
PIN19011 - Price Increase for the Listed Renesas Electronics America (REA) Radiation Hardened Space Products Price Increase Notice PDF 360 KB
Standard Microcircuit Drawing 5962-02503 (ISL72991RH) Other 0 KB
ISL72991RH Neutron Test Report Report PDF 329 KB
Intersil Commercial Lab Services Brochure PDF 364 KB
ISL72991RH SEE Test Report Report PDF 411 KB


Title language Type Format File Size Date
ISL72991RH PSPICE Model Model - Other ZIP 14.60 MB
ISL72991RHEVAL2Z Design Files PCB Design Files ZIP 452 KB

memoryBoards & Kits

Part Number Title Type Company
ISL72991RHEVAL2Z Radiation Hardened Low Dropout (LDO) Adjustable Negative Voltage Regulator Evaluation Board Evaluation Renesas

printNews & Additional Resources

Type Date Sort ascending
Low Dose Rate Acceptance Testing Page Mar 25, 2020
Standard Data Package Page Mar 19, 2020
Rad Hard SMD Test Flow Page Mar 19, 2020
Rad Hard Test Reports Page Mar 19, 2020