Features
- 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
Description
The ISL72991RH is a radiation hardened 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. This regulator 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 Renesas' 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.
Parameters
| Attributes | Value |
|---|---|
| Rating | Space |
| IOUT (A) | 1 |
| Supply Voltage (min) (V) | -30 - -30 |
| Supply Voltage (max) (V) | -3 - -3 |
| Input Voltage (Min) (V) | -3 |
| Input Voltage (Max) (V) | -30 |
| VDO @ IOUTMAX (Typ) (mV) | 1000 |
| VOUT (min) (V) | -26 |
| VOUT (max) (V) | -2.25 |
| Temp. Range (°C) | -55 to +125°C |
| TID HDR (krad(Si)) | 300 |
| TID LDR (krad(Si)) | Report Available |
| DSEE (MeV·cm2/mg) | 86.4 |
| Flow | RH Hermetic |
| Qualification Level | Class Q, Class V, EM |
| Die Sale Availability? | Yes |
| PROTO Availability? | Yes |
Applications
- Post Switching Power Supplies
- DC/DC Converters
- Motor Controllers
Renesas Boards & Kits
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 of -2.25V to -26V. The device features a 1A output current capability, an adjustable current limit pin (ILIM), and a shutdown... Read More
Support Communities
-
Question regarding ISL72991RH package thermal path
Hello, I have a question about the package structure of the ISL72991RH. The datasheet does not mention any exposed thermal pad or thermal via recommendations. However, based on the package images, there appears to be a metallic plate on the bottom of the device. Could you please clarify whether this ...
Mar 31, 2026 -
ISL72991RHVF
Hello, I need the spice model of the ISL72991RHVF but the one available in the website appears to be encrypted. Would it be possible to get the unencrypted version to use it with LTspice? Thanks in advance. Kind regards, Marta
Nov 14, 2024
Knowledge Base
-
ISL72991RH package thermal path
Last Updated: 04/08/2026 Question: Does ISL72991RH have a bottom metal pad which serves as a thermal path or is it intended to be soldered only through the leads without any dedicated thermal pad connection? Answer: The package does not have any thermal slug or metal flashing ...
Apr 8, 2026 -
When the SD (SHUTDOWN) pin on the ISL72991RH is active (High) what does the output of the regulator do?
Question: When the SD (SHUTDOWN) pin on the ISL72991RH is active (High) what does the output of the regulator do? Does it go to ground, or is it high impedance or does it do something else? Answer: The block diagram for the ISL72991RH shows that the output pin is the ...
-
ISL72991RH Vout Equation
... R2) – (IADJ x R1) (I personally like to change all numbers to volts, ohms, and amps to make it easier) -1.25 ( 1 + 100000/22810) – (.0000017 x 100000) -1.25 ( 1 + 4.384) – (.17) -1.25 x 5.384 = -6.73 -6.73 - .17 = -6.9V Suitable Products ISL72991RH
Sep 30, 2025
Support Communities
