Half-bridge gate drive with 2A peak and 118V bootstrap ceiling
The LM5101BMA/NOPB is a half-bridge gate driver from Texas Instruments designed to drive two N-channel MOSFETs in a high-side/low-side configuration. It delivers 2A peak source and 2A peak sink current to charge and discharge the gate capacitance quickly, which directly determines the switching transition time and the dead-time budget needed to prevent shoot-through in the bridge. The high-side driver uses a bootstrap supply rated to 118V, setting the maximum DC-link voltage the half-bridge can operate across. The supply rail for the driver itself is 9V to 14V, which must be clean and within that window to guarantee the gate drive voltage at the MOSFETs.
Switching speed and dead-time budget from rise/fall times
Typical rise time is 570ns and fall time is 430ns into the rated load. These numbers set the minimum dead-time between high-side and low-side turn-off to avoid cross-conduction. A controller that inserts a dead-time shorter than the sum of propagation delays plus these rise/fall times risks simultaneous conduction. The driver accepts non-inverting input logic with a VIL threshold of 2.3V. The VIH threshold is not specified in the standard listing, so the input high level should be above 2.3V with margin — typically 3.3V or 5V logic from a PWM controller works directly.
Thermal range and package for industrial power stages
The two driver channels are independent, meaning each channel has its own input and output. This allows the LM5101BMA/NOPB to drive two separate half-bridge legs or to be used in a dual low-side configuration if the bootstrap is not needed.