MP1918 3.7-5.5V Half-Bridge GaN/MOSFET Driver QFN-14

MP1918 3.7-5.5V Half-Bridge GaN/MOSFET Driver QFN-14

The MP1918 is a 100V half-bridge driver designed to drive enhancement mode Gallium Nitride (GaN) FETs or N-channel MOSFETs with a low gate threshold voltage in a half- bridge or synchronous application.

Key Specifications

Features

• Independent High-Side (HS) and Low-Side (LS) TTL Logic Inputs
• HS Floating Bias Voltage Rail Operates Up to 100VDC
• Separate Gate Outputs for Adjustable Turn- On and Turn-Off Capabilities
• Internal Bootstrap Switch Supply Voltage Clamping
• 3.7V to 5.5V VCC Voltage (VCC) Range
• 0.27Ω/1.2Ω Pull-Down/Pull-Up Resistance
• Fast Propagation Times
• Excellent Propagation Delay Matching (Typically 1.5ns)
• Available in a QFN-14 (3mmx3mm) Package with Wettable Flanks

Typical Application Circuit

Applications

• Half-Bridge and Full-Bridge Converters
• Audio Class-D Amplifiers
• Synchronous Buck Converters

Design Notes

• The current-limit threshold must stay inside the SOA of the pass device at the applied voltage, including startup inrush.
• Hot-swap inrush control is set by the slew rate on the gate or the dV/dt capacitor — too fast trips the upstream supply.
• Reverse-current blocking behaviour differs between ideal-diode and load-switch topologies; pick the one that matches the fault you are protecting against.
• Route the fault flag to a pin the firmware actually polls; a latch-off protection with no report looks like a dead board in the field.

Common Questions