FAN3226_11 Datasheet, PDF (1/25 Pages) Fairchild Semiconductor – Dual 2A High-Speed, Low-Side Gate Drivers

January 2011
FAN3226 / FAN3227 / FAN3228 / FAN3229
Dual 2A High-Speed, Low-Side Gate Drivers
Features
 Industry-Standard Pinouts
 4.5 to 18V Operating Range
 3A Peak Sink/Source at V_DD = 12V
 2.4A Sink / 1.6A Source at V_OUT = 6V
 Choice of TTL or CMOS Input Thresholds
 Four Versions of Dual Independent Drivers:
- Dual Inverting + Enable (FAN3226)
- Dual Non-Inverting + Enable (FAN3227)
- Dual Inputs in Two Pin-Out Configurations:
o Compatible with FAN3225x (FAN3228)
o Compatible with TPS2814D (FAN3229)
 Internal Resistors Turn Driver Off If No Inputs
 MillerDrive™ Technology
 12ns / 9ns Typical Rise/Fall Times with 1nF Load
 Typical Propagation Delay Under 20ns Matched
within 1ns to the Other Channel
 Double Current Capability by Paralleling Channels
 8-Lead 3x3mm MLP or 8-Lead SOIC Package
 Rated from –40°C to +125°C Ambient
Applications
 Switch-Mode Power Supplies
 High-Efficiency MOSFET Switching
 Synchronous Rectifier Circuits
 DC-to-DC Converters
 Motor Control
 Servers
Description
The FAN3226-29 family of dual 2A 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 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 FAN3226 offers two inverting drivers and the
FAN3227 offers two non-inverting drivers. Each device
has dual independent enable pins that default to ON if
not connected. In the FAN3228 and FAN3229, 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
FAN3226
FAN3227
FAN3228
Figure 1. Pin Configurations
© 2007 Fairchild Semiconductor Corporation
FAN3226 / FAN3227 / FAN3228 / FAN3229 • Rev. 1.0.7
FAN3229
www.fairchildsemi.com