ISL72991RHQF

The ISL72991RHQF is one member of the ISL72991RH series.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.

Features of the ISL72991RHQF are:(1)electrically screened to DSCC SMD # 5962-02503; (2)QML qualified per MIL-PRF-38535 requirements; (3)radiation environment:total dose (Max),300krad(SI);latch-up immune; (4)line regulation:±25mV (max); (5)load regulation:±12mV (typ); ±15mV (max); (6)output voltage range:-2.25V to -26V; (7)dropout voltage (100mA):0.2V (typ); 0.3V (max); (8)dropout voltage (1A):1V (max); (9)minimum load current:3.0mA; (10)TTL input-level shutdown (SD); low=on.The stability of the regulator is sensitive to layout. It is strongly recommended that a continuous copper ground plane (1 ounce or greater) be used. In addition, component lead lengths and interconnects should be minimized, but should not exceed 1/2 inch. Finally, the return lead of the compensation capacitor (Cc) should be connected as close as possible to the GND pin of the IC.

The absolute maximum ratings of the ISL72991RHQF can be summarized as:(1)supply voltage range:-2.25V to -26V;(2)line regulation current:±25mA (max);(3)storage temperature:-55 to 150.An input capacitor is required if the regulator is located more than 6 inches from power supply filter capacitors.A 10F solid tantalum capacitor is recommended.An output capacitor of at least 10F must be used to insure stability of the regulator. Additional capacitance may be added as required to improve the dynamic response of the regulator. Solid tantalum and/or ceramic capacitors are recommended.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.

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