MP1925 4A Half-Bridge Gate Driver QFN-8

MP1925 4A Half-Bridge Gate Driver QFN-8

The MP1925 is a high-frequency, half-bridge, N-channel power MOSFET driver.

Key Specifications

Features

• Drives an N-Channel MOSFET Half-Bridge
• 115V Bootstrap Voltage Range
• On-Chip Bootstrap Diode
• Typical Propagation Delay of 20ns
• Gate Driver Matching of Less than 5ns
• Drives a 2.2nF Load with 15ns of Rise Time and 10ns of Fall Time at 12V VDD
• TTL-Compatible Input
• Quiescent Current of Less than 150µA
• UVLO for Both High-Side and Low-Side Gate Drivers
• Available in a QFN-8 (4mmx4mm) Package

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