Single-chip buck and LDO regulator for satellite power
29 January 2020
Power Electronics / Power Management
Renesas Electronics recently announced the industry’s first single-chip synchronous buck and low dropout (LDO) regulator targeting low-power FPGAs, DDR memory and other digital loads for spaceflight payload applications.
The ISL70005SEH is a point-of-load (POL) power solution that reduces size, weight, and power (SWaP) by integrating a synchronous buck and LDO in one monolithic IC. The device enables satellite manufacturers to reduce bill of materials (BOM) and power supply footprint for their medium Earth orbit (MEO) and geosynchronous Earth orbit (GEO) long-duration mission profiles.
The rad-hard, dual-output POL regulator combines 95% high efficiency with the synch buck regulator and a low 75 mV dropout on the LDO regulator. The device enables easier thermal management for systems with 3,3 V or 5 V power buses and can support 3 A continuous output load current for the buck regulator and ±1 A for the LDO. The buck regulator uses a voltage mode control architecture and switches at a resistor-adjustable frequency of 100 kHz to 1 MHz, enabling a smaller filter size.
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