MP1923 8A Half-Bridge Gate Driver QFN-10

MP1923 8A Half-Bridge Gate Driver QFN-10

The MP1923 is a high-frequency, N-channel MOSFET, half-bridge gate driver.

Key Specifications

Features

• Drives an N-Channel MOSFET Half-Bridge
• Low Dropout with 4.5V Under-Voltage Lockout (UVLO) Falling Threshold
• 120V Bootstrap Voltage (VBST) Range
• On-Chip Bootstrap Diode
• 20ns Typical Propagation Delay
• 8A Sink Current, 7A Source Current at 12V VDD
• <5ns Gate Driver Matching Time Delay
• Drives a 1nF Load with 7.2ns Rise Time (tRISE) and 5.5ns Fall Time (tFALL) at 12V VDD
• TTL-Compatible Input
• <300µA Quiescent Current (IQ)

Typical Application Circuit

Applications

• Motor Drivers
• Telecom Half-Bridge Power Supplies
• Avionics DC/DC Converters
• Two-Switch 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