Quad Power Supply Sequencers Are Rad Hard

Intersil’s ISL70321SEH and ISL73321SEH quad radiation-hardened power supply sequencers drive point-of load (POL) regulators that power high performance FPGAs and complex, multi-rail power systems. Highly scalable, up to four power supplies can be fully sequenced by a single device or multiple devices can be easily cascaded to sequence an unlimited number of power supplies. They are said to be the industry’s first space-grade sequencers backed by single event effects (SEE) mitigation tests and complete radiation assurance testing.


The ISL70321SEH sequencer is radiation assurance tested to 100krad(Si) at high dose rate and 75krad(Si) at low dose rate, while the ISL73321SEH is assurance tested to 75krad(Si) at low dose rate. Both sequencers provide an accurate and scalable method to achieve the proper power-up and power-down sequencing of DC/DC converters essential to powering FPGAs, DSPs, RF communications ICs, and high density distributed power systems. They simplify design by using minimal external components, only requiring two resistors per power supply for voltage monitoring, and a single resistor to program the rising and falling delay.

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Both devices integrate precision input comparators with an input threshold voltage of 600 mV ±1.5% and actively monitor seven different fault conditions to provide comprehensive fault detection. A DONE indicator gives system feedback that power-up and power-down have completed successfully.


The ISL70321SEH and ISL73321SEH are available now in an 18-lead 10 mm x 12 mm CDFP or in die form. For more information and datasheets are available for the ISL70321SEH and ISL73321SEH.


Intersil Corp.

Milpitas, CA




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