FAN3227TMX — Dual 2A High-Speed Low-Side Gate Driver
1. Component Overview
En FAN3227TMX is a dual 2A high-speed, low-side gate driver manufactured by onsemi (formerly Fairchild Semiconductor). It is designed to drive N-channel enhancement-mode MOSFETs in low-side switching applications by providing high peak current pulses during short switching intervals. The device features TTL input thresholds, dual non-inverting channels with independent enable pins, and incorporates onsemi’s proprietary MillerDrive™ architecture for optimal switching performance.
The FAN3227 provides matched internal propagation delays between channels A and B (within 1 ns), making it ideal for synchronous rectifier applications. Channels can be paralleled to effectively double the drive current. The device is available in an 8-lead SOIC package and is rated for operation from –40°C to +125°C.
2. Key Specifications
| Parameter | Value |
|---|---|
| Fabricante | onsemi |
| Número de pieza | FAN3227TMX |
| Component Type | Dual Low-Side Gate Driver |
| Driver Configuration | Low-Side, Non-Inverting |
| Número de canales | 2 (Dual independent + Enable) |
| Supply Voltage (VDD) | 4.5V to 18V |
| Peak Output Current (Sink/Source) | 3A / 3A (at VDD = 12V) |
| Continuous Output Current | 2.4A Sink / 1.6A Source (at VOUT = 6V) |
| Input Threshold | TTL Compatible |
| Rise Time (typical) | 12 ns (at 1 nF load) |
| Fall Time (typical) | 9 ns (at 1 nF load) |
| Propagation Delay (typical) | 19 ns (turn-on) / 18 ns (turn-off) |
| Channel-to-Channel Delay Matching | ≤ 2 ns |
| Under-Voltage Lockout (UVLO) | Yes (integrated) |
| Paquete | 8-SOIC (3.90 mm width) |
| Tipo de montaje | Surface Mount (SMT) |
| Temperatura de funcionamiento | –40°C to +125°C |
| ESD Protection (HBM) | ±2 kV |
| Clasificación MSL | MSL 1 — Unlimited |
| Packing | Tape & Reel (2,500 units/reel) |
| Conforme a RoHS | Yes |
3. Pin Configuration & Package
Paquete: 8-Lead SOIC (3.90 mm width)
| Pin No. | Nombre de la clavija | Función |
|---|---|---|
| 1 | ENA | Enable Input for Channel A (active HIGH, defaults ON if floating) |
| 2 | INA | Non-Inverting Input for Channel A |
| 3 | GND | Ground Reference |
| 4 | ENB | Enable Input for Channel B (active HIGH, defaults ON if floating) |
| 5 | INB | Non-Inverting Input for Channel B |
| 6 | VDD | Supply Voltage (4.5V – 18V) |
| 7 | OUTA | Gate Drive Output A |
| 8 | OUTB | Gate Drive Output B |
4. Features & Functional Description
- MillerDrive™ Technology: Bipolar-MOSFET output stage provides high current during the Miller plateau region of MOSFET switching, minimizing switching losses while delivering rail-to-rail voltage swing and reverse current capability.
- Matched Propagation Delays: Channel-to-channel delay matching within 1–2 ns ensures precise timing for synchronous rectification and paralleled driver configurations.
- Dual Independent Enable: Each channel has its own enable pin with TTL thresholds. Enable pins default to ON when left unconnected, thanks to internal pull-up resistors.
- Under-Voltage Lockout (UVLO): Internal circuitry holds the output LOW until VDD rises above the operating threshold, preventing incomplete MOSFET turn-on.
- Internal Input Resistors: If inputs are left unconnected, internal 100 kΩ resistors pull inputs LOW, ensuring outputs remain LOW and MOSFETs stay off.
- Paralleled Output Capability: Channels A and B can be connected in parallel to double the peak drive current for a single MOSFET.
- Wide Supply Range: 4.5V to 18V operation covers most power supply rail voltages.
5. 5. Aplicaciones típicas
- AC-DC Power Supplies: Server and workstation power supplies requiring fast, efficient MOSFET switching.
- Synchronous Rectifiers: Matched channel delays enable precise dead-time control.
- DC-DC Converters: Low-side drive for buck, boost, and flyback topologies.
- Motor Drive Circuits: Half-bridge and H-bridge low-side switching.
- Solenoid & Relay Drivers: High peak current for fast turn-on/turn-off of inductive loads.
- LED Lighting Drivers: PWM-controlled MOSFET switching in LED drivers.
- Automotive Electronics: AEC-Q100 qualified versions (F085 suffix) available for automotive applications.
6. Equivalent & Alternative Parts
| Número de pieza | Fabricante | Descripción | Key Differences |
|---|---|---|---|
| FAN3226TMX | onsemi | Dual inverting + Enable version | Inverting logic; otherwise identical specs |
| FAN3228TMX | onsemi | Dual inputs, FAN3225x-compatible pinout | Dual input per channel (inverting + non-inverting) |
| FAN3229TMX | onsemi | Dual inputs, TPS2814D-compatible pinout | Alternative pinout for TPS2814D drop-in |
| TC1427 | Microchip | Dual 1.5A low-side gate driver | Lower peak current (1.5A), wider voltage range |
| UCC27424 | Texas Instruments | Dual 4A high-speed low-side driver | Higher peak current (4A), similar package |
| IR4427 | Infineon | Dual 1.8A low-side gate driver | Slightly lower current, different pinout |
| MCP1407 | Microchip | Dual 3A high-speed low-side driver | Comparable current, similar application range |
7. Design Recommendations
- Place a 0.1 µF ceramic bypass capacitor as close as possible to the VDD–GND pins for high-frequency noise decoupling.
- Use short, wide PCB traces between the driver outputs and MOSFET gates to minimize parasitic inductance and ringing.
- For paralleled channel operation, add small gate resistors (1–10 Ω) in series with each output to balance current sharing.
- When driving MOSFETs with high gate charge, verify that the driver can deliver sufficient average current at the target switching frequency.
- If the application requires automotive-grade reliability, specify the F085-suffixed variant (FAN3227TMX-F085), which is AEC-Q100 qualified.
- Enable pins can be left unconnected for always-on operation; connect to a logic signal for power-saving shutdown control.
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