Renesas ISL81801 bidirectional buck-boost and ISL81802 dual buck controllers

Renesas Electronics has announced a pair of 80 V DC/DC controllers that support the extra voltage margin needed for data centre servers, 48 V telecom and rugged industrial equipment.

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

The product’s combination of a high 80 V buck-boost switching frequency (600 kHz) and small package (5 x 5 mm) lets designers create ultracompact, high-density power solutions. Its wide 4.5 to 80 V range is suitable for many common 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. The buck controller is capable of 1 MHz switching frequency, enabling the use of small power supply inductors to improve power density. For higher power applications, multiple devices can be paralleled and interleaved with good transient response.

The device can generate either two independent outputs or a single high-current output, offering creative power supply engineers tremendous flexibility and IP re-use across platforms. Additionally, the capability to supply either a constant output voltage or a constant current opens up a wide array of user applications, ranging from LED drive to powering blowers to maximise airflow in dense data centre systems.