FAN3121_13 Datasheet, PDF (1/21 Pages) Fairchild Semiconductor – Single 9-A High-Speed, Low-Side Gate Driver

June 2013
FAN3121 / FAN3122
Single 9-A High-Speed, Low-Side Gate Driver
Features
 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)
Applications
 Synchronous Rectifier Circuits
 High-Efficiency MOSFET Switching
 Switch-Mode Power Supplies
 DC-to-DC Converters
 Motor Control
 Automotive-Qualified Systems (F085 Versions)
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 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
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.
VDD 1
IN 2
EN 3
GND 4
8 VDD
7 OUT
6 _OUT
5 GND
Figure 1. FAN3121 Pin Configuration
VDD 1
IN 2
EN 3
GND 4
8 VDD
7 OUT
6 OUT
5 GND
Figure 2. FAN3122 Pin Configuration
© 2008 Fairchild Semiconductor Corporation
FAN3121 / FAN3122 • Rev. 1.0.2
www.fairchildsemi.com