Half-Bridge Gate Driver for GaN FETs


Half-Bridge Gate Driver for GaN FETs

Half Bridge Gate Driver for GaN FETs

The LM5113 is designed to drive both the high-side and the low-side enhancement mode Gallium Nitride (GaN) FETs in a synchronous buck or a half bridge configuration. The floating high-side driver is capable of driving a high-side enhancement mode GaN FET operating up to 100V. The high-side bias voltage is generated using a bootstrap technique and is internally clamped at 5.2V, which prevents the gate voltage from exceeding the maximum gate-source voltage rating of enhancement mode GaN FETs. The inputs of the LM5113 are TTL logic compatible, and can withstand input voltages up to 14V regardless of the VDD voltage. The LM5113 has split gate outputs, providing flexibility to adjust the turn-on and turn-off strength independently.

Features
  • Independent high-side and low-side TTL logic inputs
  • 1.2A/5A peak source/sink current
  • High-side floating bias voltage rail operates up to 100VDC
  • Internal bootstrap supply voltage clamping
  • Split outputs for adjustable turn-on/turn-off strength
  • 0.6Ω /2.1Ω pull-down/pull-up resistance
  • Fast propagation times (28ns typical)
  • Excellent propagation delay matching (1.5ns typical)
  • Supply rail under-voltage lockout
  • Low power consumption
Typical Applications
  • Current Fed Push-Pull converters
  • Half and Full-Bridge converters
  • Synchronous Buck converters
  • Two-switch Forward converters
  • Forward with Active Clamp converters
Package
  • LLP-10 (4 mm x 4 mm)

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