Quad power supply sequencers are first to space-grade versions, says Intersil

Two quad power supply sequencers, the ISL70321SEH and ISL73321SEH, are designed to drive point of load (PoL) regulators that power high performance FPGAs and complex, multi-rail power systems, says Intersil, a subsidiary of Renesas Electronics.

The ISL70321SEH and ISL73321SEH are scalable, meaning that up to four power supplies can be fully sequenced by a single device or multiple devices can be cascaded to sequence an unlimited number of power supplies.

The power supply sequencers ensure high reliability operation with fault monitoring to boost system health and performance, says Intersil and are believed 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, meeting radiation-hardened and radiation-tolerant specs, respectively. The ISL73321SEH is assurance-tested to 75krad (Si) at low dose rate for a radiation-tolerant rating. 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 – Intersil points out that they only require two resistors per power supply for voltage monitoring, and a single resistor to program the rising and falling delay.

The integrated sequencers provide critical reliability features, and reduce bill of materials cost by replacing discrete solutions that employ several comparators, resistors, and capacitors. To ensure accurate monitoring and reliable system operation, the rad-hard ISL70321SEH and rad-tolerant ISL73321SEH integrate precision input comparators with an input threshold voltage of 600mV ±1.5 per cent to deliver the highest possible accuracy when monitoring power supply voltages. Both devices actively monitor seven different fault conditions to provide comprehensive fault detection, and a ‘done’ indicator gives system feedback that power-up and power-down have completed successfully.

The rad-hard ISL70321SEH and rad-tolerant ISL73321SEH quad power supply sequencers are available now in an 18 lead 10 x 12mm CDFP package or in die form.



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