News: Microelectronics
16 July 2021
Renesas launches plastic-packaged rad-hard ICs for medium/geosynchronous orbit satellites
Renesas Electronics Corp of Tokyo, Japan has launched a line of plastic-packaged radiation-hardened (rad-hard) devices for satellite power management systems. The four new devices include the ISL71001SLHM/SEHM point of load (POL) buck regulator, ISL71610SLHM and ISL71710SLHM digital isolators, and the ISL73033SLHM 100V GaN FET and integrated low-side driver.
Combining rad-hard assurance levels with the board area savings and cost advantages of plastic packaging, the new portfolio brings space-grade solutions to missions in medium/geosynchronous Earth orbit (MEO/GEO) with longer lifetime requirements, as well as small satellites (smallsats) and higher-density electronics, while reducing size, weight and power (SWaP) costs.
The new ICs also complement the radiation-tolerant plastic-package ICs that Renesas introduced in 2017 for smallsats in low Earth orbit (LEO). Together, Renesas’ plastic IC lineup supports multiple orbit ranges, providing the radiation performance and optimal cost balance required for a variety of satellite subsystems and payloads.
“With every new mission, customers want more functionality, which requires larger satellite payloads and has traditionally translated into increased SWaP for the satellite systems,” says Philip Chesley, VP, Industrial and Communications business division. “With Renesas’ new ICs, customers can enjoy the SWaP advantages of plastic packaging to save up to 50% of the board area compared to ceramic-packaged devices, while maintaining the reliability and radiation assurance required for higher-orbit missions with lifespans ranging up to and beyond 15 years.”
Traditionally, radiation-hardened ICs were almost exclusively produced using hermetically sealed ceramic packages, which achieved the required reliability but had significant tradeoffs in terms of size and weight. Renesas says that its new rad-hard plastic ICs help customers to reduce their electronics footprint and cost without compromising performance.
To ensure that the plastic ICs adhere to the highest quality for operation in harsh space environments, the new devices feature QMLV-like production-level testing, and all devices will undergo radiation lot acceptance testing (RLAT).
The production test flow includes 100% CSAM, x-ray, temperature cycling, static and dynamic burn-in, and visual inspection, and aligns with the SAE AS6294/1 standard for plastic-encapsulated microelectronics in space. Additional screening includes lot assurance testing per assembly and wafer lot product for HAST, life testing, and moisture sensitivity.
The rad-hard ICs are characterization tested at a total ionizing dose (TID) of up to 75krad(Si) for low dose rate (LDR) and at a linear energy transfer (LET) of 60MeV•cm2/mg or LET 86MeV•cm2/mg for single-event effects (SEE). The ISL71001SEHM is rated at TID up to 100krad(Si) for high dose rate (HDR).
Key features of the ISL73033SLHM low-side driver and 100V GaN FET include:
- combining a GaN FET driver and GaN FET in a single package to simplify gate design and improve efficiency;
- reducing area size by 20% compared with an SMD 0.5 rad-hard MOSFET;
- VDS = 100V and IDS = 30A with 7.5mΩ (typ) RDSON;
- ultra-low total gate charge of 14nC (typ);
- integrated driver featuring 4.5V regulated gate drive voltage and 3A/2.8A sink/source capability.
Key features of ISL71610SLHM and ISL71710SLHM digital isolators include:
- giant magneto-resistive (GMR) isolation technology delivering better radiation tolerance compared with existing space-grade optocouplers on the market;
- 2.5kVRMS isolation;
- up to 100Mbps data rates for the ISL71610SLHM and 150Mbps for the ISL71710SLHM;
- 1.3mA quiescent current and low EMI with no carrier or clock noise.
Key features of ISL71001SLHM/SEHM buck regulator include:
- 6A synchronous POL regulator enabling high power conversion efficiency in a smaller package;
- 95% peak efficiency;
- fixed 1MHz switching frequency;
- adjustable output voltage.
Since Renesas offers power management products that can be used in multiple power distribution architectures, customers can add the new rad-hard plastic ICs to their existing architecture with a new package type and production flow. The ISL71610SLHM and ISL71710SLHM ICs can also be combined with Renesas’ rad-hard and rad-tol CAN bus transceiver and RS-422 transceiver product families for use in serial communications systems.
The ISL71610SLHM, ISL73033SLHM and ISL71001SLHM are available now. The ISL71710SLHM will be available in September and the ISL71001SEHM will be available in fourth-quarter 2021.
