A 10MHz GaN Based Buck Converter with Dynamic Pull-up Resistor Gate Driver

Abstract

Targeting on high switching frequency gallium nitride (GaN) dc-dc buck converter, this paper presents a 10MHz switching frequency gate driver IC for GaN based synchronous buck converter with 12V maximum input voltage. The proposed bootstrap circuit prevent overcharge issue in GaN application, and the dynamic pull-up resistor gate driver suppress the gate-to-source voltage spike 400mV effectively and the rising time is 2.3ns. A low propagation delay and high common-mode transient immunity level shifter is also proposed for high speed application achieves the turn on propagtion delay is 480.9ps and the turn off propagation delay is 633.4ps by simulation result. This work was fabricated in a 0.25-μm TSMC Bipolar-CMOS-DMOS process.