FAN3268_11 FAIRCHILD [Fairchild Semiconductor], FAN3268_11 Datasheet
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FAN3268_11
Manufacturer Part Number
FAN3268_11
Description
2A Low-Voltage PMOS-NMOS Bridge Driver
Manufacturer
FAIRCHILD [Fairchild Semiconductor]
Datasheet
1.FAN3268_11.pdf
(16 pages)
© 2009 Fairchild Semiconductor Corporation
FAN3268 • Rev. 1.0.1
FAN3268
2A Low-Voltage PMOS-NMOS Bridge Driver
Features
Applications
4.5V to 18V 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 100kΩ Resistor) when
V
TTL Input Thresholds
2.4A Sink / 1.6A Source at V
Internal Resistors Turn Driver Off If No Inputs
MillerDrive™ Technology
8-Lead SOIC Package
Rated from –40°C to +125°C Ambient
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
DD
is below UVLO Threshold
OUT=
Figure 1. Typical Motor Drive Application
6V
1
Description
The FAN3268 dual 2A 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 18V. 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
voltage is below the operating level. Internal 100kΩ
resistors bias the non-inverting output low and the
inverting output to V
off during startup intervals when logic control signals
may not be present.
The
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 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.
FAN3268
driver
DD
to keep the external MOSFETs
incorporates
January 2011
www.fairchildsemi.com
MillerDrive™
DD
supply