MIC4422 MOSFET Driver Low-Side 9A

MIC4422 Low-Side MOSFET Gate Driver — 9A Peak, Non-Inverting, DIP-8

The MIC4422 from Microchip (formerly Micrel) is a high-current, single-channel, non-inverting low-side MOSFET gate driver capable of 9A peak output current — six times the output of the MC34152 — making it the choice for driving the largest power MOSFETs or multiple MOSFETs in parallel at high switching frequencies. With a 25ns rise/fall time and 4.5–18V supply range, it handles everything from 5V logic-controlled 12V motor drives to high-frequency DC-DC converter gate drive stages.

Logic-compatible inputs (3.3V and 5V) allow direct connection from any standard MCU. DIP-8 package for prototyping; note that all duplicate pins (VDD and GND) must be connected for proper high-current operation.

Key Specifications

• Manufacturer: Microchip Technology (Micrel)
• Package: DIP-8 (through-hole)
• Channels: 1 (single channel)
• Supply Voltage (VDD): 4.5V – 18V
• Output Current: 9A peak / 2A continuous
• Rise/Fall Time: 25ns (into 1nF load)
• Input Logic High: >2.4V
• Input Logic Low: <0.8V
• Logic Compatibility: 3.3V and 5V MCU compatible
• Output: Non-inverting (output follows input logic level)
• Input Hysteresis: Yes

DIP-8 Pinout

• Pin 1 — IN: Logic input (from MCU GPIO or PWM)
• Pin 2 — GND: Ground (connect both GND pins)
• Pin 3 — GND: Ground
• Pin 4 — OUT: Gate driver output (to MOSFET gate)
• Pin 5 — OUT: Gate driver output (connect both OUT pins for full current)
• Pin 6 — VDD: Supply voltage (connect both VDD pins)
• Pin 7 — VDD: Supply voltage
• Pin 8 — NC: No connection

Important: All duplicate pins (both GND, both VDD, both OUT) must be connected to handle the high transient currents. Failure to connect duplicate pins will result in damage or erratic behavior.

Decoupling Requirements

• Place 1µF low-ESR ceramic capacitor between VDD and GND as close to the IC as possible
• Add two 100nF ceramic capacitors in parallel for high-frequency decoupling
• Do not use solderless breadboard for high-frequency switching — parasitic inductance causes ringing and overshoot. Use PCB or perfboard construction.

Gate Charge Capability

At 9A peak output, the MIC4422 can charge a 180nC gate (e.g., IRFZ44N) in approximately 20ns — enabling switching frequencies well above 1MHz. For comparison, a 40mA MCU GPIO would take 4.5µs to charge the same gate, limiting practical switching frequency to ~100kHz.

• Gate charge time ≈ Qg / Ipeak = 180nC / 9A = 20ns
• Add series gate resistor (4.7Ω–22Ω) to control switching speed and reduce EMI

MIC4422 vs. MC34152

• MIC4422: 9A peak, single channel, non-inverting. For large MOSFETs or high-frequency switching where maximum gate drive current is needed.
• MC34152: 1.5A per channel, dual channel, non-inverting. For moderate gate charge MOSFETs or applications needing two independent drive channels.

Typical Applications

• High-frequency DC-DC buck/boost converter gate drive (100kHz–1MHz+)
• Large MOSFET (IRF3205, IRFZ44N) drive from 5V MCU logic
• Multiple parallel MOSFETs gate drive (combined gate charge)
• Class-D audio amplifier output stage gate drive
• Inverter gate drive for high-current switching
• Motor PWM control with fast switching for reduced heating
• Synchronous rectifier gate drive in DC-DC converters

Package Contents

• 1 × MIC4422 low-side MOSFET gate driver, DIP-8

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