Bidirectional Buck-Boost and Dual-Phase Buck DC-DC Controllers

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The high power buck controllers achieve reliable performance for 48V telecom, data centre and industrial applications

For supporting extra voltage margin needed by data centre servers, 48V telecom and rugged industrial equipment, a new pair of innovative 80V DC-DC controllers have been launched. 

The ISL81801 buck-boost controller acts as 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 ISL81801 combines 80V buck-boost switching frequency (600 kHz) and small package (5mm x 5mm) that lets designers create ultra-compact, high-density power solutions. Its wide 4.5V to 80V range is perfect for many common applications, including 48V motor drives, telecom, industrial battery backup systems and solar power.

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
  • Senses 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

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 a best-in-class transient response. The ISL81802 can generate either two independent outputs, or a single high-current output, allowing 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 that maximise airflow in dense data centre systems.

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 an 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

“The highly integrated ISL81801 and ISL81802 achieve the highest reliability performance and the ability to react quickly to transient loads with a minimum number of BOM components,” said Philip Chesley, Vice President of the Industrial and Communications Business Division at Renesas.

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.


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