80-V DC/DC controllers deliver extra voltage margin

Renesas Electronics Corp. has released a pair of 80-V DC/DC controllers that support the extra voltage margin needed for data-center servers, 48-V telecom and rugged industrial equipment. The ISL81801 buck-boost controller and ISL81802 dual-phase buck controller offer a wide input voltage range of 4.5 V to 80 V and a wide output voltage range of 0.8 V up to 80 V (76 V for the ISL81802).

The ISL81801 buck-boost controller acts like a “UPS on a chip,” said Renesas, by enabling bidirectional current flow (forward or reverse) using constant-voltage and constant-current regulation, which allows a battery or supercapacitor to be charged and discharged using a single controller and power path.

The ISL81801 claims the industry’s highest 80-V buck-boost switching frequency (600 kHz) and smallest package (5 x 5mm) for compact, high-density power solutions. The wide 4.5-V to 80-V range makes it suited for a range of applications, including 48-V motor drives, telecom, industrial battery backup systems, and solar power.

The ISL81802 is a single-chip, 80-V dual-phase synchronous buck controller with integrated drivers. Renesas said it is the industry’s only 80-V buck controller capable of 1-MHz switching frequency, which enables the use of small power supply inductors to improve power density. Multiple ISL81802s can be paralleled and interleaved for higher power applications.

The ISL81802 can generate either two independent outputs, or a single high-current output for greater design flexibility as well as IP re-use across platforms. The capability to supply either a constant output voltage or a constant current opens up a range of end-user applications, said Renesas, ranging from LED drive to powering blowers to maximize airflow in dense data-center systems.

Existing controllers like the ISL81401 40-V bidirectional 4-switch synchronous buck-boost controller and the ISL81601 60-V bidirectional 4-switch synchronous buck-boost controller are already designed into several customer solutions. The  ISL81601 also is a key device in the company’s 48-V mobility solution. Both devices were finalists in Electronic Products’ 2018 Product of the Year.

Available in 5 x 5 mm, 32-lead QFN packages and 38-lead, 4.4 x 9.7 mm HTSSOP packages, the ISL81801 and ISL81802 devices are available in volume production from Renesas’ global distributors.