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onsemi NCP51820 Gallium Nitride (GaN) Gate Driver

Ideal for GaN power switches

The NCP51820 is a high-speed gate driver which meets the demanding requirements of driving Gallium Nitride (GaN) power switches in offline half- and full-bridge power topologies. It is suitable for use with both the enhancement mode (e-mode) and Gate Injection Transistor (GIT) types of High-Electron Mobility Transistor (HEMT) GaN switches.

Power-system designers can use the NCP51820 to drive high-efficiency GaN switches in power topologies such as resonant converters, half-bridge and full-bridge converters, active clamp flyback converters, and bridgeless totem pole power factor correction.

The NCP51820 offers short and matched propagation delays. It is rated for a -3.5V to +650V common-mode voltage range on the high side. To fully protect the gate of the GaN power transistor against excessive voltage stress, both drive stages employ a dedicated voltage regulator to accurately maintain the gate-source drive signal’s amplitude.

The NCP51820 offers important protection functions such as independent under-voltage lock-out and thermal shut-down. Programmable dead-time control can be configured to prevent cross-conduction.

The driver is supplied in a 15-pin, 4mm x 4mm QFN package.

Parts Available for Immediate Sampling

Part Number Configuration Common-Mode Voltage Range Package Sample Request
NCP51820AMNTWG Half-bridge High-side: -3.5V to +650V
Low-side: -3.5V to +3.5V


NCP51820 Features

  • 50ns maximum propagation delay
  • 5ns maximum matched propagation delay
  • 1ns rise and fall times optimized for GaN devices
  • 200V/ns dV/dt rating
  • Separate source and sink Output pin

NCP51820 Applications

  • OLED TVs
  • High-power gaming adapters
  • USB power adapters
  • Server power supplies
  • Industrial inverters
  • Motor drives


Evaluation Board – NCP51820GAN1GEVB

ON-Semiconductor – Evaluation board – NCP51820GAN1GEVB

The NCP51820 GaN driver evaluation board is intended to replace the driver and power MOSFETs used in existing half- or full-bridge power supplies. The board demonstrates a way to efficiently and reliably drive two GaN power switches used in a high-voltage, totem pole circuit configuration.


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