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Buck-Boost Controller Acts as UPS-on-a-Chip

Renesas Electronics has announced a pair of 80V DC/DC controllers that support the extra voltage margin needed for data center servers, 48V 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.

According to the company, the ISL81801’s combination of the industry’s highest 80V buck-boost switching frequency (600kHz) and smallest package (5mm x 5mm) lets designers create ultra-compact, high-density power solutions. Its wide 4.5V to 80V range is well suited for many common applications, including 48V motor drives, telecom, industrial battery backup systems and solar power.

The ISL81802 is a single-chip, 80V dual-phase synchronous buck controller with integrated drivers. It is the industry’s only 80V buck controller capable of 1MHz switching frequency, enabling the use of small power supply inductors to improve power density. For higher power applications, multiple ISL81802s can be paralleled and interleaved with best-in-class transient response. The ISL81802 can generate either two independent outputs, or a single high-current output, allowing 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 end-user applications, ranging from LED drive to powering blowers to maximize airflow in dense data center systems.

Key Features of the ISL81801 Buck-Boost DC/DC Controller:

  • Wide input voltage range of 4.5V to 80V
  • Wide output voltage range of 0.8V to 80V
  • Programmable frequency from 100 kHz to 600 kHz with interleaved current sharing
  • Sense both positive and negative inductor peak current
  • Extensive multilayer protection for overvoltage, overtemperature, average and peak current limit on both outputs, undervoltage lockout, soft start, and shoot-through protection for MOSFET drivers

Key Features of the ISL81802 Dual-Phase Buck DC/DC Controller

  • Wide input voltage range of 4.5V to 80V
  • Wide output voltage range of 0.8V to 76V
  • Programmable frequency from 100 kHz to 1 MHz
  • Each output features independent soft start and precision output-enable controls
  • Extensive multilayer protection for overvoltage, undervoltage lockout, overtemperature, average and peak current limit on both outputs, and shoot-through protection for MOSFET drivers

Renesas’ ISL81601 60V bidirectional 4-switch synchronous buck-boost controller and ISL81401 40V bidirectional 4-switch synchronous buck-boost controller are already used in several innovative and customer solutions says Renesas, including a solar battery charger, emergency broadcast system (watercraft), power line feeder terminal unit, ventilator system, 48V mobility solution, USB Type-C charger and wireless charging for portable devices.

— ADVERTISMENT—

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Mass production quantities of the ISL81801 80V bidirectional 4-switch synchronous buck-boost controller and ISL81802 80V dual synchronous buck controller are available now from Renesas’ worldwide distributors. They are supplied in 5mm x 5mm, 32-lead QFN packages and 38-lead, 4.4mm x 9.7mm HTSSOP packages.

Renesas Electronics | www.renesas.com


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Buck-Boost Controller Acts as UPS-on-a-Chip

by Circuit Cellar Staff time to read: 2 min