Overview

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.

ISL72991RH Functional Diagram
ISL72991RH Functional Diagram
  • 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 (typical); ±15mV (maximum)
  • Dropout voltage (100mA): 0.2V (typical); 0.3V (maximum)
  • Dropout voltage (1A): 1V (maximum)
  • Minimum load current: 3.0mA
  • 5V-12V TTL input-level shutdown (SD); low or floating = on; high = off
  • Operating temperature range: -55 °C to +125 °C
  • Radiation acceptance testing
    • HDR (50-300rad(Si)/s): 300krad(Si)
  • SEE hardness (see SEE report for details)
    • SEL/SEB LETTH (VS = -30V): 86.4MeV•cm2/mg

Applications

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

Documentation

Design & Development

Boards & Kits

ISL72991RHEVAL2Z Rad Hard Low Dropout (LDO) Adjustable Negative Voltage Regulator Eval Board

ISL72991RHEVAL2Z

Evaluation
Learn More

Radiation Hardened Low Dropout (LDO) Adjustable Negative Voltage Regulator Evaluation Board

The ISL72991RHEVAL2Z evaluation platform showcases the ISL72991RH, a radiation hardened, low dropout adjustable negative voltage regulator with an output voltage range...

Featured Documents:
ISL72991RHEVAL2Z User Guide

ECAD Models

Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.

Explore ECAD Models
Diagram of ECAD Models

Product Options

    Processing table
    Pkg. Type
    Carrier Type
    MOQ
    DLA SMD
    Buy / Sample
    Part Number
    ISL72991RHF/PROTO
    circleActive
    memory
    spa
    view_in_ar
    		CFP Tray 1
    ISL72991RHQF
    circleActive
    memory
    spa
    view_in_ar
    		CFP Tray 25 5962F0250301QXC
    ISL72991RHVF
    circleActive
    memory
    spa
    view_in_ar
    		CFP Tray 25 5962F0250301VXC
    ISL72991RHVX
    circleActive
    memory
    view_in_ar
    		100 5962F0250301V9A
    ISL72991QF
    circleActive
    memory
    spa
    view_in_ar
    		CFP Tray 100 5962F0250301QXC
    ISL72991RHX/SAMPLE
    circleActive
    memory
    view_in_ar
    		DIE 5
    Parametric Table tips

    Tips for Using This Parametric Table:

    • Hide Filters button in header: Collapse or expands filters
    • Column sort buttons in header: Sort Column alphabetically / numerically descending or ascending
    • Reset button in header: Reset all filters to the page default
    • Full Screen button in header: Expand the table to full screen view (user must close out of full screen before they can interact with rest of page)
    • Export button in header: Export the filtered results of the table to an Excel document
    • Filter parts search bar in header: Type to filter table results by part number
    • Hide column button in column headers: Select to hide columns in table
    • AND / OR toggle switches in header: Toggles the logic of this particular filter to be “AND” or “OR” logic for filtering results
    • Multiselect checkboxes at beginning of each row in table: Select these checkboxes to compare products against each other
    • Document icon next to product name in row: View the featured document for this product
    • Chip icon next to the right of the document icon in row: View the block diagram for this product
    • Cart icon to the right of the chip icon: Indicates that samples are available for this product