Description

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 input thresholds (FAN312xT) or

VDD−proportional CMOS input thresholds (FAN312xC). 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 VDD for active HIGH logic and can

be left open for standard operation.

The commercial FAN3121/22 is available in a 3x3 mm 8−lead

thermally−enhanced MLP package or an 8−lead SOIC package. The

AEC−Q100 automotive−qualified versions are available in the 8−lead

SOIC package.

Features

• Industry−Standard Pin−out with Enable Input

• 4.5−V to 18−V Operating Range

• 11.4 A Peak Sink at VDD = 12 V

• 9.7−A Sink / 7.1−A Source at VOUT = 6 V

• Inverting Configuration (FAN3121) and Non−Inverting

Configuration (FAN3122)

• Internal Resistors Turn Driver Off If No Inputs

• 23−ns / 19−ns Typical Rise/Fall Times (10 nF Load)

• 18 ns to 23 ns Typical Propagation Delay Time

• Choice of TTL or CMOS Input Thresholds

• MillerDrive Technology

• Available in Thermally Enhanced 3x3 mm 8−Lead MLP or 8−Lead

SOIC Package (Pb−Free Finish)

• Rated from –40°C to +125°C

• Automotive Qualified to AEC−Q100 (F085 Versions)

Applications

• Synchronous Rectifier Circuits

• High−Efficiency MOSFET Switching

• Switch−Mode Power Supplies

• DC−to−DC Converters

• Motor Control

• Automotive−Qualified Systems (F085 Versions)