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FAN3180 Gate Driver IC — Features, Uses & Specifications

November 02, 2025 , ,

The FAN3180 is a high-speed, low-side MOSFET gate driver IC from onsemi (formerly Fairchild) that combines a robust MOSFET driver with an integrated 3.3 V Low Drop-Out (LDO) regulator. This makes it ideal for compact power-electronics designs where you need both a fast gate driver and a regulated logic supply for a microcontroller.

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✅ Key Features (Enhanced)

  • High current gate drive: Up to 2.8 A (sink) / 2.5 A (source) at VDD = 12 V
  • Integrated 3.3 V LDO: Provides 3.3 V at up to 15 mA; ±1% tolerance at 25 °C, ±2.5% variation overall.
  • Wide supply range: Operates from ~5 V up to 18 V (VDD) for the gate driver.
  • Fast switching timings: Typical propagation delay ~23 ns, rise/fall ~19 ns / 13 ns with 1 nF load.
  • Under-Voltage Lockout (UVLO): V_ON ≈ 4.75V, V_OFF ≈ 4.55V — holds output low until supply is safe.
  • Low standby current: Maximum ~200 µA when idle.
  • Thermal shutdown: Additional safety to protect the IC and MOSFET when overheated.
  • Rail-to-rail output with reverse-current capability: Supports MOSFET Miller-plateau switching via its patented MillerDrive™ output architecture.
  • SOT-23-5 package: Compact footprint (5-pin) for space-constrained PCBs.

Specifications

Parameter

Specification

Supply Voltage (VDD)

4.5 V to 18 V (recommended)

Gate Drive Peak Current

2.8 A (sink) / 2.5 A (source) at VDD = 12 V

3.3 V LDO Output

3.3 V, 15 mA max, ±1% @ 25 °C, ±2.5% total

Propagation Delay

~23 ns typical

Rise Time / Fall Time (1 nF load)

~19 ns rise / ~13 ns fall

UVLO Thresholds

V_ON ≈4.75 V / V_OFF ≈4.55 V

Standby Supply Current

≤ 200 µA

Operating Temperature

–40 °C to +125 °C

Package

SOT-23-5 (5-pin)

Applications & Uses

Because of the integrated LDO plus gate-driver functionality, the FAN3180 is especially suitable for:

  • Low-side MOSFET switching in SMPS (switch-mode power supplies) where a MOSFET is driven and the same driver IC also powers the MCU via 3.3 V.
  • DC-DC converters: The fast drive and compact package allow efficient high-frequency switching.
  • Motor drivers: For low-side MOSFETs in brushed or BLDC motor applications where compact design and efficient switching matter.
  • Portable and battery-powered devices: The 3.3 V LDO supports microcontrollers directly, reducing component count.
  • Embedded power management: The integrated logic supply and driver simplify design in space- and cost-constrained systems.
  • Shared drive and logic power: When you want one IC to both drive a MOSFET gate and supply logic power (via the LDO) in your board design.

Why Choose FAN3180?

  • Reduced component count: Because it includes the 3.3 V regulator, you may omit a separate LDO – saving BOM cost and board area.
  • Optimised for switching: Fast delays and strong peak currents mean improved MOSFET switching performance, lower losses.
  • Logic compatibility: TTL/CMOS-compatible input, lower voltage logic friendly.
  • Safety features built-in: UVLO and thermal shutdown increase reliability in power systems.

Summary

The FAN3180 is a versatile gate driver + logic LDO combo IC ideal for modern embedded power designs. With peak drive currents around 2.8 A, integrated 3.3 V 15 mA regulator, and fast switching performance, it’s well suited for compact, efficient power electronics applications. For anyone designing MOSFET-based switching stages and needing logic supply from the same board, this IC offers an excellent solution.

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