HIGH-SPEED, LOW-SIDE DRIVERS
1A to 9A drivers with flexible options to fit every
design need
The FAN3100 and FAN3200 series of low-side driver families
offer 70 different devices that provide choices of 1A, 2A,
4A or 9A current ratings in single- or dual-channel versions
in either commercial or automotive AEC-Q100 qualified
grades. The families offer an unequaled combination of
fast switching, smaller size and design flexibility options for
driving power switches and relays.
These drivers offer multiple design advantages: high
peak currents for efficient MOSFET and IGBT switching;
amplification of the built-in output current of analog and
digital controllers; removal of power dissipation from control
ICs; ability to alleviate noise problems by placing near
MOSFET(s) to minimize high-current loops and to move
noise source away from sensitive control chips; and the easy
implementation of additional features such as level shifting
and timing delays.
Features
Operation
• Typical 4.5V to 18V operation
• Under-voltage lockout for predictable startup
• Short and well-controlled time delays (<20 ns) for
paralleling, delay-timing and MHz switching
Output
• Compound MillerDriveTM architecture for strong gate drive
during the Miller plateau region
• Typically less than 15ns rise and fall times at specified loads
Applications
• Switch-mode power supplies
• DC-DC converters
• Synchronous rectifier circuits
• Motor control
• Line drivers
Automotive AEC AEC-Q100 qualified devices
Our best-in-class AEC-Q100 high-speed, low-side gate driver
products are complemented by a full range of AEC-Q101 rated
power MOSFETs. Fairchild has a focused automotive product
line, with dedicated resources, for customer quality support
including global power labs and regional applications support.
Our automotive product development and manufacturing sites
are QS-9000 and ISO/TS-16949 certified. Automotive products
are manufactured and assembled in-house at Fairchild
operated facilities.
MillerDrive™ Output Architecture
VDD
• Fail-safe inputs to hold the output low if an input signal is
absent
• -40°C to +125°C operation
• Industry’s smallest packages (2mm x 2mm and 3mm x
3mm MLP) as well as standard SOT-23 and SOIC-8
Input
• TTL or CMOS (VDD ratio) thresholds for logic-level
compatibility and improved noise immunity
• Options for two inputs per channel for design flexibility
• Enable inputs which default to ON if not connected
Input
Stage
VOUT
MillerDriveTM is a combination
of bipolar and MOSFET devices,
that speed up switching by
providing high current during
the Miller plateau region when
the gate-drain capacitance of
the MOSFET is being charged
or discharged. The bipolar
devices carry the bulk of the
current during switching and the
MOSFET devices pull the output
to the HIGH or LOW rail at the
end of the switching cycle.
Use of bipolar devices allows
the drivers to provide large
currents over a wide range of
supply voltage and temperature
variations.
www.fairchildsemi.com
PARALLEL PROCESSING ARCHITECTURE
Part Number
Applications
FAN3100
FAN3111
PFC Gate Drive (Single or
Distributed Power Stages)
External gate drive is needed
to drive larger MOSFETs used
in higher power PFC preregulators.
Diagram
Boost converter with paralleled switches
Boost Output
VDD
FAN3111
1
3
IN+
Downstream
Converters
Q1A
33Ω
5
OUT
2
GND
4
IN–
VDD
Logic
PWM
FAN3111
1
VDD
3
IN+
Gate Drive with Integrated
LDO to Power External MCUs
Many systems today
use a combination of a
microcontroller, an external
low-dropout regulator (LDO)
and a gate driver.
Q1B
33Ω
5
OUT
2
GND
4
IN–
Gate Drive with 3.3V LDO Power for the MCU
The FAN3180 is a single 2A
low-side driver with an integrated
3.3V output voltage regulator
that can power microcontrollers
or ASICs as well as provide a
strong gate drive for an external
semiconductor switch.
VDD
Load
FAN3180
VDD
MCU
GND
PWM
Input
FAN3268 (20V)
FAN3278 (30V)
Low-side drivers used in PFC
applications are driving highvoltage MOSFETs that have a
much lower total gate charge.
1A or 2A drivers are usually
sufficient to meet the switching
demands.
Rectified
AC Input
VDD
FAN3180
Solutions
Low-Voltage Single-Phase or
Three-Phase Motor Driver
Applications include batterypowered compact brushless
DC motor drives such as 12V
blower motors in industrial,
medical and automotive
segments.
IN+
1
UVLO
2
3
5
OUT
4
LDO
3V3
Low-Voltage Motor Drivers
The need to drive a high-side
PMOS, low-side NMOS without
having to develop a floating
high-side drive. Switching
performance such as rise/fall
time, switching loss, etc., is not
critical in this application.
+VRAIL
FAN3268 (4.5 – 18V)
FAN3278 (8.0 – 27V)
FAN3268/78
1
ENA
Controller
3
ENB
8
VDD
6
A
2
GND
7
B
4
MOTOR
5
CBYP
FAN3240
FAN3241
FAN3227T
FAN3224T
Relay Drivers
Directly drive single- or
dual-coil relays without the
use of external MOSFETs.
Applications include smart
meter connect/disconnect
switches and other industrial
applications.
Dual-Coil Smart Relay Driver
FAN3240/41
1 EN
10Ω
2x
Clamp
Diode
VS 8
VDD
2 5VB OUT1 7
CLOSE
MCU
OPEN
3 IN1
GND 6
2.2µF
Dual-Coil Relay
A
RELAY_CLOSE
B
C
4 IN2
0.22µF
2
Relay
Bias
1N4148
(Optional)
OUT2 5
RELAY_OPEN
Bypass for
Relay Bias
The FAN324x dual-coil relay
driver can be used with 12V,
24V, or 48V relays. Several
features are integrated: accurate
input filter timing, XOR input
protection, maximum output
pulse-width limit, and internal
regular for isolated or nonisolated designs. For 12V singlecoil relays sink/source drivers
can be used.
PARALLEL PROCESSING ARCHITECTURE
Part Number
Applications
Diagram
FAN3226
FAN3227
FAN3223
FAN3224
FAN3216
FAN3217
FAN3213
FAN3214
Automotive Power Inverter
Provides single IC solution to
push-pull boost stage. Can be
used in low-side quadrant of
the output H-bridge, with the
high-voltage IC gate driver for
the upper quadrant. Low-side
drivers can also be used for
secondary-side synchronous
rectifiers.
Automotive Power Inverter
VBATT
FAN3227
CPU
1
ENA
ENB
Push-pull
Transformer
Solutions
D3
8
2
INA
OUTA
7
3
GND
VDD
6
4
INB
OUTB
5
D4
L2
120VAC
14V / 170V
D1
D2
L3
The low-side drivers are able
to switch high-current, LowRDS MOSFETs over the full
input voltage range, and at
high frequency to prevent
EMI interference in on-board
electronics.
HVIC Gate Driver
HV
Isolation
Control
HVIC Gate Driver
HV
FAN3100
FAN3111
FAN3121
FAN3122
Gate Drive for GroundReference Switches
Provides local high-current
gate drive that interfaces
between the input signal
(from MCU/DSP or a PWM
controller) and the groundreference power switch.
Forward Converter with Hybrid Synchronous Rectifier
VOUT
VIN
PWM
IN
VDD
IN
AGND
GND
FAN3100
OUT
IN
IN
AGND
BIAS
FAN3216
FAN3217
FAN3226
FAN3227
FAN3213
FAN3214
FAN3223
FAN3224
FAN325C
Primary-Side Gate Drive
Transformer and SecondarySide SR Control
Dual low-side drivers are
used to drive each leg of a
half-bridge, half-bridge LLC,
full-bridge or phase-shifted
converters. The low-side
switch of the bridge is
driven through a gate drive
transformer to maintain
matched propagation
delay relative to high-side
switch gate drive. The PWM
controller can be located on
the primary or secondary side.
VDD
GND
FAN3100
OUT
Primary-Side Gate Drive Transformer of a Phase-Shifted Full-Bridge
Converter and Secondary-Side SR Control
VIN
The driver must be able to
source/sink high peak current
at the Miller plateau switching
region. Therefore, use the driver
current rating at 1/2VDD.
VOUT
QC
QA
QD
QB
FAN3224
PWM-A
FAN3225C
SR-1
PWM-B
FAN3225C
PWM-C
Secondary
Phase-Shift
Controller
Using a dual low-side driver
to drive one-half of a bridge
topology requires that the
propagation delays through each
channel be closely matched.
Any propagation delay mismatch
between channels will result in
timing inaccuracy for setting the
dead-time between the upper
and lower gate drive of the
bridge. Fairchild dual low-side
drivers have propagation delays
with near-perfect matching to
within 1 to 2ns.
SR-2
PWM-D
3
PFC FOR FAN APPLICATION
Input
Threshold
1
2
SOT23-5

+1.1/-0.9



Single Channel of Dual-Input/Single-Output


Single

+2.5/-1.8



Single Channel of Two-Input/One-Output


FAN3180
2
Single

+2.4/-1.6

Single Non-Inverting + 3.3V, 15mA LDO


FAN3216
2
Dual


+2.4/-1.6

Dual Inverting Channels

FAN3217
2
Dual


+2.4/-1.6

Dual Non-Inverting Channels

FAN3226
2
Dual


+2.4/-1.6

Dual Inverting Channels + Dual Enable


FAN3227
2
Dual


FAN3228
2
Dual
FAN3229
2
Dual
FAN3268
2
Dual
FAN3278
2
Dual
FAN3213
4
FAN3214



+2.4/-1.6



+2.4/-1.6



+2.4/-1.6




Dual Non-Inverting Channels + Dual Enable

Dual Channels of Two-Input/One-Output (Pinout 1)

Dual Channels of Two-Input/One-Output (Pinout 2)











+2.4/-1.6

Non-Inverting + Inverting + Dual Enables (20V)

+2.4/-1.6

Non-Inverting + Inverting + Dual Enables (30V)
Dual


+4.3/-2.8

Dual Inverting Channels


4
Dual


+4.3/-2.8

Dual Non-Inverting Channels


FAN3223
4
Dual


+4.3/-2.8


Dual Inverting Channels + Dual Enable



FAN3224
4
Dual


+4.3/-2.8


Dual Non-Inverting Channels + Dual Enable



FAN3225
4
Dual


+4.3/-2.8


Dual Channels of Two-Input/One-Output



FAN3121
9
Single


+9.7/-7.1


Single Inverting Channel + Enable



FAN3122
9
Single


+9.7/-7.1



FAN3240
Relay
Dual

+12.0
FAN3241
Relay
Dual

+12.0
Dual channels can be paralleled to double current-capability
Automotive AEC-Q100 qualified products offered in SOIC-8 only
3
4




Single Non-Inverting Channel + Enable

Dual-Coil Relay Driver, Timing Configuration 0


Dual-Coil Relay Driver, Timing Configuration 1

Typical gate-drive current at output at 6V and VDD of 12V
CMOS: VDD ratio thresholds (approx. 35% and 55%)
Layout and Connection Guidelines
5
6
• Keep high-current output and power-ground paths separate
from logic input, enable and signal ground paths.
• Keep the driver IC as close to the load as possible.
• Make connections to all pins as short and direct as possible
to minimize noise injection.
Driver Current Rating at VDD/2
QG
(nC)
1A
2A
5nC
8ns
4ns
10nC
15ns
8ns
4ns
20nC
30ns
15ns
8ns
3ns
50nC
75ns
38ns
19ns
8ns
100nC
150ns
75ns
38ns
17ns
200nC
300ns
150ns
75ns
33ns
SILICON VALLEY
HEADQUARTERS
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OFFICES
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
Thresholds proportional to an externally supplied reference voltage
Dual-input: Can be used for inverting or non-inverting logic
Switching Time (ns)
High-speed gate drivers incorporate fast-reacting input circuits,
short propagation delays, and powerful output stages delivering
large current peaks for fast voltage transition times. The following
guidelines are strongly recommended for optimum operation.
4
MLP-8
MillerDriveTM
Single
2
Description / Logic
MLP-6
Dual Input6
1
FAN3100
Automotive2
FAN3111
Commercial
Family
(A)
TTL5
Gate Drive3
(Sink/Src)
(A)
Part
Number
CMOS4
Number
of
Channels1
Package
SOIC-8
Grade
4A
9A
For each current rating,
the table shows the
approximate minimum
turn-on or turn-off times
for a given gate charge
(QG) with no seriesgate-drive resistance
used (which will slow
down the transition).
Select a driver to meet
a desired switching time
to minimize switching
losses. Switching time
estimate: tSW,MIN= (QG/
IRATED) • 1.5
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