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)