MP1921B 2.5A High-Frequency Half-Bridge Gate Driver QFN10

MP1921B 2.5A High-Frequency Half-Bridge Gate Driver QFN10

The MP1921B is a high-frequency 100V half- bridge N-channel power MOSFET driver.

Key Specifications

Features

• Drives N-Channel MOSFET Half-Bridge
• 120V VBST Voltage Range
• On-Chip Bootstrap Diode
• Typical 16ns Propagation Delay Time
• Less Than 5ns Gate Drive Matching
• Drives 1nf Load with 12ns/9ns Rise/Fall Times with 12V VDD
• TTL Compatible Input
• Less Than 150A Quiescent Current
• UVLO for Both High Side and Low Side
• In QFN10 (3mmx3mm) Package

Typical Application Circuit

Applications

• Telecom Half-Bridge Power Supplies
• Avionics DC/DC Converters
• Two-Switch Forward Converters
• Active-Clamp Forward Converters

Design Notes

• Set dead time to match the external FET turn-off, not the datasheet typical. Too little risks shoot-through, too much distorts the current waveform at low duty cycle.
• Use a Kelvin connection for the current-sense resistor; shared copper injects switching noise straight into the sense amplifier.
• The thermal pad is the only heat path for most packages — via-stitch it to a ground plane with at least 9 vias.
• PWM frequency trades switching loss against current ripple in the motor inductance; 20 kHz keeps the drive out of the audible band.
• Add a brake or coast path so regeneration during a fast stop does not pump the supply rail.

Common Questions