Radiation Hardened Single-Chip Synchronous Buck and Low Dropout Regulator. Photo: Renesas Electronics

Renesas Electronics has deployed a single-chip synchronous buck and low dropout (LDO) regulator. It targets low-power FPGAs, DDR memory, and other digital loads for spaceflight payload applications. The company said the ISL70005SEH is the only point-of-load (POL) power solution that reduces size, weight, and power (SWaP) by integrating a synch buck and LDO in one IC.

The ISL70005SEH rad-hard dual output POL regulator combines 95 percent high efficiency with the synch buck regulator and a low 75mV dropout on the LDO regulator. The device is designed to enable easier thermal management for systems with 3.3V or 5V power buses and can support 3A continuous output load current for the buck regulator and ±1A for the LDO. The buck regulator uses a voltage mode control architecture and switches at a resistor adjustable frequency of 100kHz to 1MHz, enabling a smaller filter size.

“The ISL70005SEH gives satellite manufacturers the superior radiation performance, and SWaP and BOM savings they want,” said Philip Chesley, Vice President, Industrial and Communications Business Division at Renesas. “Our dual output POL regulator also provides the configurability to address multiple applications in commercial telecommunication satellites, military satcom satellites, and science and exploration missions.”