LM5109B-Q1 Half Bridge Gate Driver Texas Instruments LM5109B-Q1 Half Bridge Gate Driver is a cost-effective, high-voltage gate driver designed to drive both the high-side and the low-side N-Channel MOSFETs. This can be done in a synchronous buck or a half bridge configuration. The floating high-side driver is capable of working with rail voltages up to 90V. The outputs are independently controlled with TTL/CMOS compatible logic input thresholds. The robust level shift technology operates at high speed while consuming low power and providing clean level transitions from the control input logic to the high-side gate driver. Under-voltage lockout is provided on both the low-side and the high-side power rails.