Texas Instruments LMG1025/LMG1025-Q1 Half-Bridge GaN Driver

Texas Instruments LMG1025/LMG1025-Q1 Half-Bridge GaN Driver is designed to drive both the high-side and the low-side enhancement mode Gallium Nitride (GaN) FETs in a synchronous buck, boost, or half-bridge configuration. The device has an integrated 100V bootstrap diode and independent inputs for the high-side and low-side outputs for maximum control flexibility. The high-side bias voltage is generated using a bootstrap technique. It is internally clamped at 5V, which prevents the gate voltage from exceeding the maximum gate-source voltage rating of enhancement-mode GaN FETs. The inputs of the LMG1205/LMG1025-Q1 are TTL logic compatible and can withstand input voltages up to 14V regardless of the VDD voltage. The LMG1205/LMG1205-Q1 has split-gate outputs, providing flexibility to independently adjust the turn-on and turn-off strength.

In addition, the strong sink capability of the LMG1205/LMG1025-Q1 maintains the gate in the low state, preventing unintended turn-on during switching. The LMG1205/LMG1025-Q1 can operate up to several MHz. The LMG1205/LMG1025-Q1 is available in a 12-pin DSBGA package with a compact footprint and minimized package inductance. The Texas Instruments LMG1025-Q1 devices are AEC-Q100 qualified for automotive applications.

Features

  • Independent high-side and low-side TTL logic inputs
  • 1.2A peak source, 5A sink current
  • High-side floating bias voltage rail operates up to 100VDC
  • Internal bootstrap supply voltage clamping
  • Split outputs for adjustable turn-on and turn-off strength
  • 0.6Ω pull-down, 2.1Ω pull-up resistance
  • Fast propagation times (35ns typical)
  • Excellent propagation delay matching (1.5ns typical)
  • Supply rail undervoltage lockout
  • Low power consumption

Applications

  • Current-fed push-pull converters
  • Half and full-bridge converters
  • Synchronous buck converters
  • Two-switch forward converters
  • Forward with active clamp converters

Functional Block Diagram

Block Diagram - Texas Instruments LMG1025/LMG1025-Q1 Half-Bridge GaN Driver
Published: 2020-02-24 | Updated: 2024-05-22