FAN3223_12 Datasheet, PDF (1/24 Pages) Fairchild Semiconductor – Dual 4A High-Speed, Low-Side Gate Drivers

August 2012
FAN3223 / FAN3224 / FAN3225_F085
Dual 4A High-Speed, Low-Side Gate Drivers
Features
ƒ Qualified to AEC Q-100
ƒ 4.5 to 18V Operating Range
ƒ 5A Peak Sink/Source at VDD = 12V
ƒ 4.3A Sink / 2.8A Source at V_OUT = 6V
ƒ Choice of TTL or CMOS Input Thresholds
ƒ Three Versions of Dual Independent Drivers:
- Dual Inverting + Enable (FAN3223)
- Dual Non-Inverting + Enable (FAN3224)
- Dual-Inputs (FAN3225)
ƒ Internal Resistors Turn Driver Off If No Inputs
ƒ MillerDrive™ Technology
ƒ 12ns / 9ns Typical Rise/Fall Times with 2.2nF Load
ƒ Typical Propagation Delay Under 20ns Matched
within 1ns to the Other Channel
ƒ Double Current Capability by Paralleling Channels
ƒ 8-Lead SOIC Package
ƒ Rated from –40°C to +125°C Ambient
Applications
ƒ Switch-Mode Power Supplies
ƒ High-Efficiency MOSFET Switching
ƒ Synchronous Rectifier Circuits
ƒ DC-to-DC Converters
ƒ Motor Control
Description
The FAN3223-25 family of dual 4A gate drivers is
designed to drive N-channel enhancement-mode
MOSFETs in low-side switching applications by
providing high peak current pulses during the short
switching intervals. The driver is available with either
TTL or CMOS input thresholds. Internal circuitry
provides an under-voltage lockout function by holding
the output LOW until the supply voltage is within the
operating range. In addition, the drivers feature matched
internal propagation delays between A and B channels
for applications requiring dual gate drives with critical
timing, such as synchronous rectifiers. This also
enables connecting two drivers in parallel to effectively
double the current capability driving a single MOSFET.
The FAN322X drivers incorporate 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
process to minimize switching loss, while providing rail-
to-rail voltage swing and reverse current capability.
The FAN3223 offers two inverting drivers and the
FAN3224 offers two non-inverting drivers. Each device
has dual independent enable pins that default to ON if
not connected. In the FAN3225, each channel has dual
inputs of opposite polarity, which allows configuration as
non-inverting or inverting with an optional enable
function using the second input. If one or both inputs are
left unconnected, internal resistors bias the inputs such
that the output is pulled LOW to hold the power
MOSFET OFF.
Related Resources
AN-6069: Application Review and Comparative
Evaluation of Low-Side Gate Drivers
FAN3223
© 2012 Fairchild Semiconductor Corporation
FAN3223 / FAN3224 / FAN3225_F085 • Rev. 1.0.0
FAN3224
Figure 1. Pin Configurations
FAN3225
www.fairchildsemi.com