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 over the -55°C to +125°C temperature range and post-irradiation. Specifications include a reference voltage of -1.25V +40mV/-50mV (max), line regulation of ±25mV (max), and load regulation of ±15mV (max).

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.

Specifications for Rad Hard QML devices are controlled by the Defense Supply Center in Columbus (DSCC). The SMD numbers listed here must be used when ordering.

Detailed Electrical Specifications for these devices are contained in SMD 5962-02503. A 'hotlink' is provided on the Intersil website for downloading.

• Electrically Screened to DSCC SMD # 5962-02503
• QML Qualified per MIL-PRF-38535 Requirements
• Radiation Environment
  • Total Dose (Max) 300krad(SI)
  • Latch-Up Immune
• Line Regulation ±25mV (max)
• Load Regulation ±12mV (typ); ±15mV (max)
• Output Voltage Range -2.25V to -26V
• Dropout Voltage (100mA) 0.2V (typ); 0.3V (max)
• Dropout Voltage (1A) 1V (max)
• Minimum Load Current 3.0mA
• TTL Input-Level Shutdown (SD); Low = On

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