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December 2013
FAN3268
2 A Low-Voltage PMOS-NMOS Bridge Driver
Features
Description
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4.5 V to 18 V Operating Range
Drives High-Side PMOS and Low-Side NMOS in
Motor Control or Buck Step-Down Applications
Inverting Channel B Biases High-Side PMOS
Device Off (with internal 100 k Ω Resistor) when
V DD is below UVLO Threshold
TTL Input Thresholds
2.4 A Sink / 1.6 A Source at V OUT =6 V
Internal Resistors Turn Driver Off If No Inputs
MillerDrive? Technology
8-Lead SOIC Package
Rated from –40°C to +125°C Ambient
Automotive Qualified to AEC-Q100 (F085 Version)
The FAN3268 dual 2 A gate driver is optimized to drive
a high-side P-channel MOSFET and a low-side N-
channel MOSFET in motor control applications
operating from a voltage rail up to 18 V. The driver has
TTL input thresholds and provides buffer and level
translation functions from logic inputs. Internal circuitry
provides an under-voltage lockout function that
prevents the output switching devices from operating if
the V DD supply voltage is below the operating level.
Internal 100 k Ω resistors bias the non-inverting output
low and the inverting output to V DD to keep the external
MOSFETs off during startup intervals when logic control
signals may not be present.
The FAN3268 driver incorporates 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
Applications
process to minimize switching loss, while providing rail-
to-rail voltage swing and reverse current capability.
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Motor Control with PMOS / NMOS Half-Bridge
Configuration
Buck Converters with High-Side PMOS Device;
100% Duty Cycle Operation Possible
Logic-Controlled Load Circuits with High-Side
PMOS Switch
Automotive-Qualified Systems (F085 version)
The FAN3268 has two independent enable pins that
default to on if not connected. If the enable pin for non-
inverting channel A is pulled low, OUTA is forced low; if
the enable pin for inverting channel B is pulled low,
OUTB is forced high. If an input is left unconnected,
internal resistors bias the inputs such that the external
MOSFETs are off.
Related Resources
AN-6069 — Application Review and Comparative
Evaluation of Low-Side Gate Drivers
+VRAIL (4.5 ? 18V)
FAN3268
Controller
1
2
ENA
A
ENB
8
7
3
4
GND
B
VDD
6
5
MOTOR
C BYP
Figure 1. Typical Motor Drive Application
? 2009 Fairchild Semiconductor Corporation
FAN3268 ? Rev. 1.0.3
1
www.fairchildsemi.com
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