The FAN3121 and FAN3122 MOSFET drivers are designed to drive N-channel enhancement MOSFETs in low-side switching applications by providing high peak current pulses. The drivers are available with either TTL (FAN312xT) or CMOS (FAN312xC) input thresholds. Internal circuitry provides an under-voltage lockout function by holding the output low until the supply voltage is within the operating range.

FAN312x drivers incorporate the MillerDrive™ architecture for the final output stage. This bipolar / MOSFET combination provides the highest peak current during the Miller plateau stage of the MOSFET turn-on / turn-off process.

The FAN3121 and FAN3122 drivers implement an enable function on pin 3 (EN), previously unused in the industry-standard pin-out. The pin is internally pulled up to V_DD for active HIGH logic and can be left open for standard operation.

The FAN3121/22 is available in a 3x3mm 8-lead thermally-enhanced MLP package or an 8-lead SOIC package.

• Industry-Standard Pin-out with Enable Input
• 4.5 to 18V Operating Range
• 11.4A Peak Sink at V_DD = 12V
• 9.7A Sink / 7.1A Source at V_OUT = 6V
• Inverting Configuration (FAN3121) and Non-Inverting Configuration (FAN3122)
• Internal Resistors Turn Driver Off If No Inputs
• 23ns/19ns Typical Rise/Fall Times with 10nF Load
• 20ns Typical Propagation Delay Time
• Choice of TTL or CMOS Input Thresholds
• MillerDrive™ Technology
• Available in Thermally Enhanced 3x3mm 8-Lead MLP or 8-Lead SOIC Package (Pb-Free Finish)
• Rated from –40°C to +125°C

• Synchronous Rectifier Circuits
• High-Efficiency MOSFET Switching
• Switch-Mode Power Supplies
• DC-to-DC Converters
• Motor Control