Description
The FAN3223−25 family of dual 4 A gate drivers is designed to
drive N−channel enhancement−mode MOSFETs in low-side
switching applications by providing high peak current pulses during
the short switching intervals. The driver is available with either TTL
or CMOS input thresholds. Internal circuitry provides an
under−voltage lockout function by holding the output LOW until the
supply voltage is within the operating range. In addition, the drivers
feature matched internal propagation delays between A and B
channels for applications requiring dual gate drives with critical
timing, such as synchronous rectifiers. This also enables connecting
two drivers in parallel to effectively double the current capability
driving a single MOSFET.
The FAN322X drivers incorporate MillerDrive™ architecture for
the final output stage. This bipolar−MOSFET combination provides
high current during the Miller plateau stage of the MOSFET turn−on /
turn−off process to minimize switching loss, while providing
rail−to−rail voltage swing and reverse current capability.
The FAN3223 offers two inverting drivers and the FAN3224 offers
two non−inverting drivers. Each device has dual independent enable
pins that default to ON if not connected. In the FAN3225, each channel
has dual inputs of opposite polarity, which allows configuration as
non−inverting or inverting with an optional enable function using the
second input. If one or both inputs are left unconnected, internal
resistors bias the inputs such that the output is pulled LOW to hold the
power MOSFET OFF.

Features
• Industry−Standard Pinouts
• 4.5 V to 18 V Operating Range
• 5 A Peak Sink/Source at VDD = 12 V
• 4.3 A Sink / 2.8 A Source at VOUT = 6 V
• Choice of TTL or CMOS Input Thresholds
• Three Versions of Dual Independent Drivers:
♦ Dual Inverting + Enable (FAN3223)
♦ Dual Non−Inverting + Enable (FAN3224)
♦ Dual−Inputs (FAN3225)
• Internal Resistors Turn Driver Off If No Inputs
• MillerDrive Technology
• 12 ns / 9 ns Typical Rise/Fall Times (2.2 nF Load)
• Under 20 ns Typical Propagation Delay Matched within 1 ns to the
Other Channel
• Double Current Capability by Paralleling Channels
• 8−Lead SOIC and 8−Lead SOIC Exposed Pad Package
• Rated from –40°C to +125°C Ambient
• Automotive Qualified to AEC-Q100
• These are Pb−Free Devices

Applications
• Switch−Mode Power Supplies
• High-Efficiency MOSFET Switching
• Synchronous Rectifier Circuits
• DC-to-DC Converters
• Motor Control
• Automotive-Qualified Systems
Related Resources
• AN−6069 — Application Review and
Comparative Evaluation of Low−Side Gate
Drivers