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FAN3122

Single 9-A High-Speed, Low-Side Gate Driver

Fairchild Semiconductor 

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 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)

 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 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.

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

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