November 9, 2017 | Product Brief | Intersil, a subsidiary of Renesas Electronics Corp. has announced the ISL70321SEH and ISL73321SEH quad power supply sequencers designed to 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 cascaded to sequence an unlimited number of power supplies. Intersil’s radiation-hardened power supply sequencers ensure high reliability operation with fault monitoring to boost system health and performance, and they are 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, requiring two resistors per power supply for voltage monitoring, and a single resistor to program the rising and falling delay.
The highly 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 ISL70321SEH and ISL73321SEH integrate precision input comparators with an input threshold voltage of 600 mV ±1.5 percent 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.