Description:The ISL70321SEH and ISL73321SEH are radiation hardened and SEE mitigated power supply sequencers designed to drive Point-of-Load (POL) regulators with enable pins. 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 for dense RF applications. This power supply sequencer requires only two feedback resistors per power supply and a single resistor to set the rising and falling delay. The device features
Renesas provides a recommended PCB layout guide in their application note AN1965, which includes guidelines for component placement, thermal management, and routing to minimize noise and ensure optimal performance.
The ISL70321SEHF/PROTO is rated for operation up to 125°C, but to ensure reliable operation, it's essential to follow proper thermal design and management practices, such as using a heat sink, thermal interface material, and ensuring good airflow.
Renesas recommends using low-ESR capacitors with a value of 10uF to 22uF for the input and output capacitors. The specific capacitor values and types may vary depending on the application and operating conditions.
Renesas provides a troubleshooting guide in their application note AN1966, which covers common issues and their solutions, including output voltage instability, overheating, and noise-related problems.
The ISL70321SEHF/PROTO is designed to meet the radiation hardness and latch-up immunity requirements of space and high-reliability applications. Renesas provides detailed information on radiation testing and results in their application note AN1967.
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ISL70321SEHF/PROTO Overview
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