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January 2014
FAN3121 / FAN3122
Single 9-A High-Speed, Low-Side Gate Driver
Features
Description
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Industry-Standard Pin-out with Enable Input
4.5-V to 18-V Operating Range
11.4 A Peak Sink at V DD = 12 V
9.7-A Sink / 7.1-A Source at V OUT = 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)
20-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)
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 V DD -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 V DD for active HIGH logic and can be left open for
standard operation.
The commercial FAN3121/22 is available in a 3x3 mm
Applications
8-lead thermally-enhanced MLP package or an 8-lead
SOIC package. The AEC-Q100 automotive-qualified
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Synchronous Rectifier Circuits
High-Efficiency MOSFET Switching
Switch-Mode Power Supplies
DC-to-DC Converters
Motor Control
Automotive-Qualified Systems (F085 Versions)
versions are available in the 8-lead SOIC package.
VDD 1
8
VDD
VDD 1
8 VDD
IN
EN
2
3
7
6
OUT
OUT
IN
EN
2
3
7 OUT
6 OUT
GND 4
5
GND
GND 4
5 GND
Figure 1.
FAN3121 Pin Configuration
Figure 2.
FAN3122 Pin Configuration
? 2008 Fairchild Semiconductor Corporation
FAN3121 / FAN3122 ? Rev. 1.0.3
www.fairchildsemi.com
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