Fairchild FAN3225TMX Dual 4a high-speed, low-side gate driver Datasheet

FAN3223 / FAN3224 / FAN3225
Dual 4A High-Speed, Low-Side Gate Drivers
Features
Description
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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.
Industry-Standard Pinouts
4.5 to 18V Operating Range
5A Peak Sink/Source at VDD = 12V
4.3A Sink / 2.8A Source at VOUT = 6V
Choice of TTL or CMOS Input Thresholds
Three Versions of Dual Independent Drivers:
-
Dual Inverting + Enable (FAN3223)
Dual Non-Inverting + Enable (FAN3224)
Dual-Inputs (FAN3225)
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Internal Resistors Turn Driver Off If No Inputs
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Double Current Capability by Paralleling Channels
MillerDrive™ Technology
12ns / 9ns Typical Rise/Fall Times with 2.2nF Load
Typical Propagation Delay Under 20ns Matched
within 1ns to the Other Channel
8-Lead 3x3mm MLP or 8-Lead SOIC Package
Rated from –40°C to +125°C Ambient
Applications
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Switch-Mode Power Supplies
High-Efficiency MOSFET Switching
Synchronous Rectifier Circuits
DC-to-DC Converters
Motor Control
The FAN322X drivers incorporate MillerDrive™
architecture for the final output stage. This bipolarMOSFET combination provides high current during the
Miller plateau stage of the MOSFET turn-on / turn-off
process to minimize switching loss, while providing railto-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
Evaluation of Low-Side Gate Drivers
FAN3223
FAN3224
Comparative
FAN3225
Figure 1. Pin Configurations
© 2007 Fairchild Semiconductor Corporation
FAN3223 / FAN3224 / FAN3225 • Rev. 1.0.5
www.fairchildsemi.com
FAN3223 / FAN3224 / FAN3225 — Dual 4A High-Speed, Low-Side Gate Drivers
January 2010
Part Number
Logic
Input
Threshold
FAN3223CMPX
FAN3223CMX
FAN3223TMPX
CMOS
Dual Inverting Channels + Dual Enable
TTL
FAN3223TMX
FAN3224CMPX
CMOS
FAN3224CMX
Dual Non-Inverting Channels + Dual
FAN3224TMPX Enable
TTL
FAN3224TMX
FAN3225CMPX
CMOS
FAN3225CMX
Dual Channels of Two-Input / OneFAN3225TMPX Output Drivers
TTL
FAN3225TMX
Package
Packing
Method
Quantity
per Reel
3x3mm MLP-8
Tape & Reel
3,000
SOIC-8
Tape & Reel
2,500
3x3mm MLP-8
Tape & Reel
3,000
SOIC-8
Tape & Reel
2,500
3x3mm MLP-8
Tape & Reel
3,000
SOIC-8
Tape & Reel
2,500
3,000
3x3mm MLP-8
Tape & Reel
SOIC-8
Tape & Reel
2,500
3x3mm MLP-8
Tape & Reel
3,000
SOIC-8
Tape & Reel
2,500
3x3mm MLP-8
Tape & Reel
3,000
SOIC-8
Tape & Reel
2,500
All standard Fairchild Semiconductor products are RoHS compliant and many are also “GREEN” or going green. For Fairchild’s
definition of “green” please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
Package Outlines
Figure 2. 3x3mm MLP-8 (Top View)
Figure 3. SOIC-8 (Top View)
Thermal Characteristics(1)
ΘJL
Package
(2)
(3)
ΘJT
(4)
ΘJA
ΨJB
(5)
(6)
ΨJT
Units
8-Lead 3x3mm Molded Leadless Package (MLP)
1.2
64
42
2.8
0.7
°C/W
8-Pin Small Outline Integrated Circuit (SOIC)
38
29
87
41
2.3
°C/W
Notes:
1.
2.
3.
4.
5.
6.
Estimates derived from thermal simulation; actual values depend on the application.
Theta_JL (ΘJL): Thermal resistance between the semiconductor junction and the bottom surface of all the leads (including any
thermal pad) that are typically soldered to a PCB.
Theta_JT (ΘJT): Thermal resistance between the semiconductor junction and the top surface of the package, assuming it is
held at a uniform temperature by a top-side heatsink.
Theta_JA (ΘJA): Thermal resistance between junction and ambient, dependent on the PCB design, heat sinking, and airflow.
The value given is for natural convection with no heatsink, as specified in JEDEC standards JESD51-2, JESD51-5, and
JESD51-7, as appropriate.
Psi_JB (ΨJB): Thermal characterization parameter providing correlation between semiconductor junction temperature and an
application circuit board reference point for the thermal environment defined in Note 4. For the MLP-8 package, the board
reference is defined as the PCB copper connected to the thermal pad and protruding from either end of the package. For the
SOIC-8 package, the board reference is defined as the PCB copper adjacent to pin 6.
Psi_JT (ΨJT): Thermal characterization parameter providing correlation between the semiconductor junction temperature and
the center of the top of the package for the thermal environment defined in Note 4.
© 2007 Fairchild Semiconductor Corporation
FAN3223 / FAN3224 / FAN3225 • Rev. 1.0.5
www.fairchildsemi.com
2
FAN3223 / FAN3224 / FAN3225 — Dual 4A High-Speed, Low-Side Gate Drivers
Ordering Information
FAN3224
FAN3225
Figure 4. Pin Assignments (Repeated)
Pin Definitions
Name
Pin Description
ENA
Enable Input for Channel A. Pull pin LOW to inhibit driver A. ENA has TTL thresholds for both TTL and
CMOS INx threshold.
ENB
Enable Input for Channel B. Pull pin LOW to inhibit driver B. ENB has TTL thresholds for both TTL and
CMOS INx threshold.
GND
Ground. Common ground reference for input and output circuits.
INA
Input to Channel A.
INA+
Non-Inverting Input to Channel A. Connect to VDD to enable output.
INA-
Inverting Input to Channel A. Connect to GND to enable output.
INB
Input to Channel B.
INB+
Non-Inverting Input to Channel B. Connect to VDD to enable output.
INB-
Inverting Input to Channel B. Connect to GND to enable output.
OUTA
Gate Drive Output A: Held LOW unless required input(s) are present and VDD is above UVLO threshold.
OUTB
Gate Drive Output B: Held LOW unless required input(s) are present and VDD is above UVLO threshold.
OUTA
Gate Drive Output A (inverted from the input): Held LOW unless required input is present and VDD is
above UVLO threshold.
OUTB
Gate Drive Output B (inverted from the input): Held LOW unless required input is present and VDD is
above UVLO threshold.
Thermal Pad (MLP only). Exposed metal on the bottom of the package; may be left floating or connected
to GND; NOT suitable for carrying current.
P1
Supply Voltage. Provides power to the IC.
VDD
Output Logic
FAN3223 (x=A or B)
ENx
0
0
INx
FAN3224 (x=A or B)
OUTx
ENx
0
0
0
(7)
0
0
1
1
1
(7)
0
1
(7)
(7)
1
0
1
(7)
1
(7)
INx
OUTx
FAN3225 (x=A or B)
INx+
(7)
0
0
(7)
1
0
0
(7)
(7)
0
0
0
1
1
INx−
OUTx
0
0
(7)
0
1
0
1
1
(7)
0
1
1
Note:
7. Default input signal if no external connection is made.
© 2007 Fairchild Semiconductor Corporation
FAN3223 / FAN3224 / FAN3225 • Rev. 1.0.5
www.fairchildsemi.com
3
FAN3223 / FAN3224 / FAN3225 — Dual 4A High-Speed, Low-Side Gate Drivers
FAN3223
FAN3223 / FAN3224 / FAN3225 — Dual 4A High-Speed, Low-Side Gate Drivers
Block Diagrams
Figure 5. FAN3223 Block Diagram
Figure 6. FAN3224 Block Diagram
© 2007 Fairchild Semiconductor Corporation
FAN3223 / FAN3224 / FAN3225 • Rev. 1.0.5
www.fairchildsemi.com
4
FAN3223 / FAN3224 / FAN3225 — Dual 4A High-Speed, Low-Side Gate Drivers
Block Diagrams
Figure 7. FAN3225 Block Diagram
© 2007 Fairchild Semiconductor Corporation
FAN3223 / FAN3224 / FAN3225 • Rev. 1.0.5
www.fairchildsemi.com
5
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be
operable above the recommended operating conditions and stressing the parts to these levels is not recommended.
In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability.
The absolute maximum ratings are stress ratings only.
Symbol
Parameter
Min.
Max.
Unit
-0.3
20.0
V
VDD
VDD to PGND
VEN
ENA and ENB to GND
GND - 0.3 VDD + 0.3
V
VIN
INA, INA+, INA–, INB, INB+ and INB– to GND
GND - 0.3 VDD + 0.3
V
OUTA and OUTB to GND
GND - 0.3 VDD + 0.3
V
VOUT
TL
Lead Soldering Temperature (10 Seconds)
TJ
Junction Temperature
TSTG
Storage Temperature
ESD
Electrostatic Discharge
Protection Level
+260
ºC
-55
+150
ºC
-65
+150
ºC
Human Body Model, JEDEC JESD22-A114
4
kV
Charged Device Model, JEDEC JESD22-C101
1
kV
Recommended Operating Conditions
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended
operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not
recommend exceeding them or designing to Absolute Maximum Ratings.
Symbol
Parameter
Min.
Max.
Unit
4.5
18.0
V
VDD
Supply Voltage Range
VEN
Enable Voltage ENA and ENB
0
VDD
V
VIN
Input Voltage INA, INA+, INA–, INB, INB+ and INB–
0
VDD
V
TA
Operating Ambient Temperature
-40
+125
ºC
© 2007 Fairchild Semiconductor Corporation
FAN3223 / FAN3224 / FAN3225 • Rev. 1.0.5
www.fairchildsemi.com
6
FAN3223 / FAN3224 / FAN3225 — Dual 4A High-Speed, Low-Side Gate Drivers
Absolute Maximum Ratings
Unless otherwise noted, VDD=12V, TJ=-40°C to +125°C. Currents are defined as positive into the device and negative
out of the device.
Symbol
Parameter
Conditions
Min.
Typ. Max.
Unit
Supply
VDD
Operating Range
4.5
IDD
Supply Current,
Inputs / EN Not Connected
All except FAN3225C
VON
Turn-On Voltage
INA=ENA=VDD, INB=ENB=0V
VOFF
Turn-Off Voltage
INA=ENA=VDD, INB=ENB=0V
18.0
V
0.70
0.95
mA
0.21
0.35
mA
3.5
3.9
4.3
V
3.3
3.7
4.1
V
0.8
1.2
(8)
FAN3225C
(9)
Inputs (FAN322xT)
VINL_T
INx Logic Low Threshold
VINH_T
INx Logic High Threshold
1.6
V
2.0
V
IIN+
Non-inverting Input
IN from 0 to VDD
-1.5
175.0
µA
IIN-
Inverting Input
IN from 0 to VDD
-175.0
1.5
µA
0.8
V
VHYS_T
TTL Logic Hysteresis Voltage
0.2
0.4
30
38
(9)
Inputs (FAN322xC)
VINL_C
INx Logic Low Threshold
VINH_C
INx Logic High Threshold
55
%VDD
70
%VDD
IINL
IN Current, Low
IN from 0 to VDD
-1
175
µA
IINH
IN Current, High
IN from 0 to VDD
-175
1
µA
VHYS_C
CMOS Logic Hysteresis Voltage
17
%VDD
1.2
V
ENABLE (FAN3223C, FAN3223T, FAN3224C, FAN3224T)
VENL
Enable Logic Low Threshold
VENH
Enable Logic High Threshold
VHYS_T
RPU
tD3
tD4
EN from 5V to 0V
0.8
EN from 0V to 5V
1.6
(10)
TTL Logic Hysteresis Voltage
(10)
Enable Pull-up Resistance
2.0
V
0.4
V
100
kΩ
EN to Output Propagation Delay
(11)
0V to 5V EN, 1V/ns Slew Rate
9
17
26
ns
EN to Output Propagation Delay
(11)
5V to 0V EN, 1V/ns Slew Rate
11
18
28
ns
Continued on the following page…
© 2007 Fairchild Semiconductor Corporation
FAN3223 / FAN3224 / FAN3225 • Rev. 1.0.5
www.fairchildsemi.com
7
FAN3223 / FAN3224 / FAN3225 — Dual 4A High-Speed, Low-Side Gate Drivers
Electrical Characteristics
Unless otherwise noted, VDD=12V, TJ=-40°C to +125°C. Currents are defined as positive into the device and negative
out of the device.
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Unit
Output
ISINK
(10)
OUT Current, Mid-Voltage, Sinking
ISOURCE
OUT Current, Mid-Voltage, Sourcing
IPK_SINK
OUT Current, Peak, Sinking
IPK_SOURCE
tRISE
tFALL
(10)
(10)
(10)
OUT Current, Peak, Sourcing
(11)
Output Rise Time
Output Fall Time
(11)
tD1, tD2
Output Propagation Delay, CMOS
(12)
Inputs
tD1, tD2
Output Propagation Delay, TTL Inputs
TDEL.MATCH
IRVS
(12)
Propagation Matching Between Channels
Output Reverse Current Withstand
OUT at VDD/2,
CLOAD=0.22µF, f=1kHz
4.3
A
OUT at VDD/2,
CLOAD=0.22µF, f=1kHz
-2.8
A
CLOAD=0.22µF, f=1kHz
5
A
CLOAD=0.22µF, f=1kHz
-5
A
CLOAD=2200pF
12
20
ns
CLOAD=2200pF
9
17
ns
0 - 12VIN, 1V/ns Slew Rate
10
18
29
ns
0 - 5VIN, 1V/ns Slew Rate
9
17
29
ns
2
4
ns
INA=INB, OUTA and OUTB
at 50% point
(10)
500
mA
Notes:
8. Lower supply current due to inactive TTL circuitry.
9. EN inputs have TTL thresholds; refer to the ENABLE section
10. Not tested in production.
11. See Timing Diagrams of Figure 10 and Figure 11.
12. See Timing Diagrams of Figure 8 and Figure 9.
© 2007 Fairchild Semiconductor Corporation
FAN3223 / FAN3224 / FAN3225 • Rev. 1.0.5
www.fairchildsemi.com
8
FAN3223 / FAN3224 / FAN3225 — Dual 4A High-Speed, Low-Side Gate Drivers
Electrical Characteristics (Continued)
Figure 8. Non-Inverting (EN HIGH or Floating)
Figure 9. Inverting (EN HIGH or Floating)
Figure 10. Non-Inverting (IN HIGH)
Figure 11. Inverting (IN LOW)
© 2007 Fairchild Semiconductor Corporation
FAN3223 / FAN3224 / FAN3225 • Rev. 1.0.5
www.fairchildsemi.com
9
FAN3223 / FAN3224 / FAN3225 — Dual 4A High-Speed, Low-Side Gate Drivers
Timing Diagrams
Typical characteristics are provided at 25°C and VDD=12V unless otherwise noted.
Figure 12. IDD (Static) vs. Supply Voltage
(13)
Figure 13. IDD (Static) vs. Supply Voltage
(13)
(13)
Figure 14. IDD (Static) vs. Supply Voltage
Figure 15. IDD (No-Load) vs. Frequency
© 2007 Fairchild Semiconductor Corporation
FAN3223 / FAN3224 / FAN3225 • Rev. 1.0.5
Figure 16. IDD (No-Load) vs. Frequency
www.fairchildsemi.com
10
FAN3223 / FAN3224 / FAN3225 — Dual 4A High-Speed, Low-Side Gate Drivers
Typical Performance Characteristics
Typical characteristics are provided at 25°C and VDD=12V unless otherwise noted.
Figure 17. IDD (2.2nF Load) vs. Frequency
Figure 19. IDD (Static) vs. Temperature
Figure 18. IDD (2.2nF Load) vs. Frequency
(13)
Figure 20. IDD (Static) vs. Temperature
Figure 21. IDD (Static) vs. Temperature
© 2007 Fairchild Semiconductor Corporation
FAN3223 / FAN3224 / FAN3225 • Rev. 1.0.5
(13)
(13)
www.fairchildsemi.com
11
FAN3223 / FAN3224 / FAN3225 — Dual 4A High-Speed, Low-Side Gate Drivers
Typical Performance Characteristics
Typical characteristics are provided at 25°C and VDD=12V unless otherwise noted.
Figure 22. Input Thresholds vs. Supply Voltage
Figure 23. Input Thresholds vs. Supply Voltage
Figure 24. Input Threshold % vs. Supply Voltage
Figure 25. Input Thresholds vs. Temperature
© 2007 Fairchild Semiconductor Corporation
FAN3223 / FAN3224 / FAN3225 • Rev. 1.0.5
Figure 26. Input Thresholds vs. Temperature
www.fairchildsemi.com
12
FAN3223 / FAN3224 / FAN3225 — Dual 4A High-Speed, Low-Side Gate Drivers
Typical Performance Characteristics
Typical characteristics are provided at 25°C and VDD=12V unless otherwise noted.
Figure 27. UVLO Thresholds vs. Temperature
Figure 28. UVLO Threshold vs. Temperature
Figure 29. Propagation Delay vs. Supply Voltage
Figure 30. Propagation Delay vs. Supply Voltage
Figure 31. Propagation Delay vs. Supply Voltage
Figure 32. Propagation Delay vs. Supply Voltage
© 2007 Fairchild Semiconductor Corporation
FAN3223 / FAN3224 / FAN3225 • Rev. 1.0.5
www.fairchildsemi.com
13
FAN3223 / FAN3224 / FAN3225 — Dual 4A High-Speed, Low-Side Gate Drivers
Typical Performance Characteristics
Typical characteristics are provided at 25°C and VDD=12V unless otherwise noted.
Figure 33. Propagation Delays vs. Temperature
Figure 34. Propagation Delays vs. Temperature
Figure 35. Propagation Delays vs. Temperature
Figure 36. Propagation Delays vs. Temperature
Figure 37. Fall Time vs. Supply Voltage
© 2007 Fairchild Semiconductor Corporation
FAN3223 / FAN3224 / FAN3225 • Rev. 1.0.5
Figure 38.
Rise Time vs. Supply Voltage
www.fairchildsemi.com
14
FAN3223 / FAN3224 / FAN3225 — Dual 4A High-Speed, Low-Side Gate Drivers
Typical Performance Characteristics
FAN3223 / FAN3224 / FAN3225 — Dual 4A High-Speed, Low-Side Gate Drivers
Typical Performance Characteristics
Typical characteristics are provided at 25°C and VDD=12V unless otherwise noted.
Figure 39.
Rise and Fall Times vs. Temperature
Figure 40. Rise/Fall Waveforms with 2.2nF Load
Figure 41. Rise/Fall Waveforms with 10nF Load
Figure 42. Quasi-Static Source Current
(14)
with VDD=12V
© 2007 Fairchild Semiconductor Corporation
FAN3223 / FAN3224 / FAN3225 • Rev. 1.0.5
(14)
Figure 43. Quasi-Static Sink Current with VDD=12V
www.fairchildsemi.com
15
Typical characteristics are provided at 25°C and VDD=12V unless otherwise noted.
Figure 44. Quasi-Static Source Current
(14)
with VDD=8V
(14)
Figure 45. Quasi-Static Sink Current with VDD=8V
Notes:
13. For any inverting inputs pulled low, non-inverting inputs pulled high, or outputs driven high, static IDD increases by
the current flowing through the corresponding pull-up/down resistor shown in the block diagram.
14. The initial spike in each current waveform is a measurement artifact caused by the stray inductance of the
current-measurement loop.
Test Circuit
Figure 46. Quasi-Static IOUT / VOUT Test Circuit
© 2007 Fairchild Semiconductor Corporation
FAN3223 / FAN3224 / FAN3225 • Rev. 1.0.5
www.fairchildsemi.com
16
FAN3223 / FAN3224 / FAN3225 — Dual 4A High-Speed, Low-Side Gate Drivers
Typical Performance Characteristics
Input Thresholds
MillerDrive™ Gate Drive Technology
Each member of the FAN322x driver family consists of
two identical channels that may be used independently
at rated current or connected in parallel to double the
individual current capacity. In the FAN3223 and
FAN3224, channels A and B can be enabled or disabled
independently using ENA or ENB, respectively. The EN
pin has TTL thresholds for parts with either CMOS or
TTL input thresholds. If ENA and ENB are not
connected, an internal pull-up resistor enables the driver
channels by default. ENA and ENB have TTL thresholds
in parts with either TTL or CMOS INx threshold. If the
channel A and channel B inputs and outputs are
connected in parallel to increase the driver current
capacity, ENA and ENB should be connected and
driven together.
FAN322x gate drivers incorporate the MillerDrive™
architecture shown in Figure 47. For the output stage, a
combination of bipolar and MOS devices provide large
currents over a wide range of supply voltage and
temperature variations. The bipolar devices carry the
bulk of the current as OUT swings between 1/3 to 2/3
VDD and the MOS devices pull the output to the HIGH or
LOW rail.
The purpose of the MillerDrive™ architecture is to
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 as part of
the turn-on / turn-off process.
For applications that have zero voltage switching during
the MOSFET turn-on or turn-off interval, the driver
supplies high peak current for fast switching even
though the Miller plateau is not present. This situation
often occurs in synchronous rectifier applications
because the body diode is generally conducting before
the MOSFET is switched ON.
The FAN322x family offers versions in either TTL or
CMOS input thresholds. In the FAN322xT, the input
thresholds meet industry-standard TTL-logic thresholds
independent of the VDD voltage, and there is a
hysteresis voltage of approximately 0.4V. These levels
permit the inputs to be driven from a range of input logic
signal levels for which a voltage over 2V is considered
logic HIGH. The driving signal for the TTL inputs should
have fast rising and falling edges with a slew rate of
6V/µs or faster, so a rise time from 0 to 3.3V should be
550ns or less. With reduced slew rate, circuit noise
could cause the driver input voltage to exceed the
hysteresis voltage and retrigger the driver input, causing
erratic operation.
The output pin slew rate is determined by VDD voltage
and the load on the output. It is not user adjustable, but
a series resistor can be added if a slower rise or fall time
at the MOSFET gate is needed.
In the FAN322xC, the logic input thresholds are
dependent on the VDD level and, with VDD of 12V, the
logic rising edge threshold is approximately 55% of VDD
and the input falling edge threshold is approximately
38% of VDD. The CMOS input configuration offers a
hysteresis voltage of approximately 17% of VDD. The
CMOS inputs can be used with relatively slow edges
(approaching DC) if good decoupling and bypass
techniques are incorporated in the system design to
prevent noise from violating the input voltage hysteresis
window. This allows setting precise timing intervals by
fitting an R-C circuit between the controlling signal and
the IN pin of the driver. The slow rising edge at the IN
pin of the driver introduces a delay between the
controlling signal and the OUT pin of the driver.
Figure 47. MillerDrive™ Output Architecture
Under-Voltage Lockout
The FAN322x start-up logic is optimized to drive
ground-referenced N-channel MOSFETs with an undervoltage lockout (UVLO) function to ensure that the IC
starts up in an orderly fashion. When VDD is rising, yet
below the 3.9V operational level, this circuit holds the
output LOW, regardless of the status of the input pins.
After the part is active, the supply voltage must drop
0.2V before the part shuts down. This hysteresis helps
prevent chatter when low VDD supply voltages have
noise from the power switching. This configuration is not
suitable for driving high-side P-channel MOSFETs
because the low output voltage of the driver would turn
the P-channel MOSFET ON with VDD below 3.9V.
Static Supply Current
In the IDD (static) typical performance characteristics
(Figure 12 - Figure 14 and Figure 19 - Figure 21), the
curve is produced with all inputs/enables floating (OUT
is low) and indicates the lowest static IDD current for the
tested configuration. For other states, additional current
flows through the 100kΩ resistors on the inputs and
outputs shown in the block diagram of each part (see
Error! Reference source not found. - Figure 7). In
these cases, the actual static IDD current is the value
obtained from the curves plus this additional current.
VDD Bypass Capacitor Guidelines
© 2007 Fairchild Semiconductor Corporation
FAN3223 / FAN3224 / FAN3225 • Rev. 1.0.5
www.fairchildsemi.com
17
FAN3223 / FAN3224 / FAN3225 — Dual 4A High-Speed, Low-Side Gate Drivers
Applications Information
The FAN322x is compatible with many other
industry-standard drivers. In single input parts with
enable pins, there is an internal 100kΩ resistor tied
to VDD to enable the driver by default; this should
be considered in the PCB layout.
ƒ
The turn-on and turn-off current paths should be
minimized, as discussed in the following section.
Figure 48 shows the pulsed gate drive current path
when the gate driver is supplying gate charge to turn the
MOSFET ON. The current is supplied from the local
bypass capacitor, CBYP, and flows through the driver to
the MOSFET gate and to ground. To reach the high
peak currents possible, the resistance and inductance in
the path should be minimized. The localized CBYP acts
to contain the high peak current pulses within this driverMOSFET circuit, preventing them from disturbing the
sensitive analog circuitry in the PWM controller.
A typical criterion for choosing the value of CBYP is to
keep the ripple voltage on the VDD supply to ≤5%. This
is often achieved with a value ≥20 times the equivalent
load capacitance CEQV, defined here as QGATE/VDD.
Ceramic capacitors of 0.1µF to 1µF or larger are
common choices, as are dielectrics, such as X5R and
X7R with good temperature characteristics and high
pulse current capability.
If circuit noise affects normal operation, the value of
CBYP may be increased to 50-100 times the CEQV, or
CBYP may be split into two capacitors. One should be a
larger value, based on equivalent load capacitance, and
the other a smaller value, such as 1-10nF mounted
closest to the VDD and GND pins to carry the higher
frequency components of the current pulses. The
bypass capacitor must provide the pulsed current from
both of the driver channels and, if the drivers are
switching simultaneously, the combined peak current
sourced from the CBYP would be twice as large as when
a single channel is switching.
Layout and Connection Guidelines
The FAN3223-25 family of gate drivers incorporates
fast-reacting input circuits, short propagation delays,
and powerful output stages capable of delivering current
peaks over 4A to facilitate voltage transition times from
under 10ns to over 150ns. The following layout and
connection guidelines are strongly recommended:
ƒ
Keep high-current output and power ground paths
separate logic and enable input signals and signal
ground paths. This is especially critical when
dealing with TTL-level logic thresholds at driver
inputs and enable pins.
ƒ
Keep the driver as close to the load as possible to
minimize the length of high-current traces. This
reduces the series inductance to improve highspeed switching, while reducing the loop area that
can radiate EMI to the driver inputs and
surrounding circuitry.
ƒ
If the inputs to a channel are not externally
connected, the internal 100kΩ resistors indicated
on block diagrams command a low output. In noisy
environments, it may be necessary to tie inputs of
an unused channel to VDD or GND using short
traces to prevent noise from causing spurious
output switching.
ƒ
Many high-speed power circuits can be susceptible
to noise injected from their own output or other
external sources, possibly causing output retriggering. These effects can be obvious if the
circuit is tested in breadboard or non-optimal circuit
layouts with long input, enable, or output leads. For
best results, make connections to all pins as short
and direct as possible.
© 2007 Fairchild Semiconductor Corporation
FAN3223 / FAN3224 / FAN3225 • Rev. 1.0.5
Figure 48. Current Path for MOSFET Turn-on
Figure 49 shows the current path when the gate driver
turns the MOSFET OFF. Ideally, the driver shunts the
current directly to the source of the MOSFET in a small
circuit loop. For fast turn-off times, the resistance and
inductance in this path should be minimized.
Figure 49. Current Path for MOSFET Turn-off
www.fairchildsemi.com
18
FAN3223 / FAN3224 / FAN3225 — Dual 4A High-Speed, Low-Side Gate Drivers
ƒ
To enable this IC to turn a device ON quickly, a local
high-frequency bypass capacitor CBYP with low ESR and
ESL should be connected between the VDD and GND
pins with minimal trace length. This capacitor is in
addition to bulk electrolytic capacitance of 10µF to 47µF
commonly found on driver and controller bias circuits.
Operational Waveforms
The FAN3225 truth table indicates the operational states
using the dual-input configuration. In a non-inverting
driver configuration, the IN- pin should be a logic LOW
signal. If the IN- pin is connected to logic HIGH, a disable
function is realized, and the driver output remains LOW
regardless of the state of the IN+ pin.
At power-up, the driver output remains LOW until the
VDD voltage reaches the turn-on threshold. The
magnitude of the OUT pulses rises with VDD until
steady-state VDD is reached. The non-inverting
operation illustrated in Figure 52 shows that the output
remains LOW until the UVLO threshold is reached, then
the output is in-phase with the input.
IN+
IN-
OUT
0
0
0
0
1
0
1
0
1
1
1
0
In the non-inverting driver configuration in Figure 50, the
IN- pin is tied to ground and the input signal (PWM) is
applied to IN+ pin. The IN- pin can be connected to logic
HIGH to disable the driver and the output remains LOW,
regardless of the state of the IN+ pin.
Figure 52. Non-Inverting Start-Up Waveforms
For the inverting configuration of Figure 51, start-up
waveforms are shown in Figure 53. With IN+ tied to
VDD and the input signal applied to IN–, the OUT
pulses are inverted with respect to the input. At powerup, the inverted output remains LOW until the VDD
voltage reaches the turn-on threshold, then it follows the
input with inverted phase.
Figure 50. Dual-Input Driver Enabled,
Non-Inverting Configuration
In the inverting driver application in Figure 51, the IN+
pin is tied HIGH. Pulling the IN+ pin to GND forces the
output LOW, regardless of the state of the IN- pin.
Figure 51. Dual-Input Driver Enabled,
Inverting Configuration
Figure 53. Inverting Start-Up Waveforms
© 2007 Fairchild Semiconductor Corporation
FAN3223 / FAN3224 / FAN3225 • Rev. 1.0.5
www.fairchildsemi.com
19
FAN3223 / FAN3224 / FAN3225 — Dual 4A High-Speed, Low-Side Gate Drivers
Truth Table of Logic Operation
Thermal Guidelines
Gate drivers used to switch MOSFETs and IGBTs at
high frequencies can dissipate significant amounts of
power. It is important to determine the driver power
dissipation and the resulting junction temperature in the
application to ensure that the part is operating within
acceptable temperature limits.
To give a numerical example, if the synchronous
rectifier switches in the forward converter of Figure 54
are FDMS8660S, the datasheet gives a total gate
charge of 60nC at VGS = 7V, so two devices in parallel
would have 120nC gate charge. At a switching
frequency of 300kHz, the total power dissipation is:
The total power dissipation in a gate driver is the sum of
two components, PGATE and PDYNAMIC:
PTOTAL = PGATE + PDYNAMIC
(1)
Gate Driving Loss: The most significant power loss
results from supplying gate current (charge per unit
time) to switch the load MOSFET ON and OFF at
the switching frequency. The power dissipation that
results from driving a MOSFET at a specified gatesource voltage, VGS, with gate charge, QG, at
switching frequency, FSW, is determined by:
PGATE = QG • VGS • FSW • n
(2)
Dynamic Pre-drive / Shoot-through Current: A
power loss resulting from internal current
consumption under dynamic operating conditions,
including pin pull-up / pull-down resistors, can be
obtained using the “IDD (No-Load) vs. Frequency”
graphs in Typical Performance Characteristics to
determine the current IDYNAMIC drawn from VDD
under actual operating conditions:
= PTOTAL • ψJB + TB
PDYNAMIC = 1.5mA • 7V • 2 = 0.021W
(6)
PTOTAL = 0.52W
(7)
TB,MAX = TJ - PTOTAL • ψJB
(8)
TB,MAX = 120°C – 0.52W • 42°C/W = 98°C
(9)
For comparison, replace the SOIC-8 used in the
previous example with the 3x3mm MLP package with
ψJB = 2.8°C/W. The 3x3mm MLP package could operate
at a PCB temperature of 118°C, while maintaining the
junction temperature below 120°C. This illustrates that
the physically smaller MLP package with thermal pad
offers a more conductive path to remove the heat from
the driver. Consider tradeoffs between reducing overall
circuit size with junction temperature reduction for
increased reliability.
(3)
Once the power dissipated in the driver is determined,
the driver junction rise with respect to circuit board can
be evaluated using the following thermal equation,
assuming ψJB was determined for a similar thermal
design (heat sinking and air flow):
TJ
(5)
The SOIC-8 has a junction-to-board thermal
characterization parameter of ψJB = 42°C/W. In a
system application, the localized temperature around
the device is a function of the layout and construction of
the PCB along with airflow across the surfaces. To
ensure reliable operation, the maximum junction
temperature of the device must be prevented from
exceeding the maximum rating of 150°C; with 80%
derating, TJ would be limited to 120°C. Rearranging
Equation 4 determines the board temperature required
to maintain the junction temperature below 120°C:
n is the number of driver channels in use (1 or 2).
PDYNAMIC = IDYNAMIC • VDD • n
PGATE = 120nC • 7V • 300kHz • 2 = 0.5W
(4)
where:
= driver junction temperature
TJ
ψJB = (psi) thermal characterization parameter
relating temperature rise to total power
dissipation
TB = board temperature in location as defined in
the Thermal Characteristics table.
© 2007 Fairchild Semiconductor Corporation
FAN3223 / FAN3224 / FAN3225 • Rev. 1.0.5
www.fairchildsemi.com
20
Figure 54. High Current Forward Converter
with Synchronous Rectification
Figure 55.
Center-tapped Bridge Output with
Synchronous Rectifiers
Figure 56. Secondary Controlled Full Bridge with Current Doubler Output, Synchronous Rectifiers
(Simplified)
© 2007 Fairchild Semiconductor Corporation
FAN3223 / FAN3224 / FAN3225 • Rev. 1.0.5
www.fairchildsemi.com
21
FAN3223 / FAN3224 / FAN3225 — Dual 4A High-Speed, Low-Side Gate Drivers
Typical Application Diagrams
Type
Related Products
Part
Number
(15)
Gate Drive
(Sink/Src)
Input
Threshold
Logic
Package
Single 1A
FAN3111C
+1.1A / -0.9A
CMOS
Single Channel of Dual-Input/Single-Output
SOT23-5, MLP6
Single 1A
FAN3111E
+1.1A / -0.9A
External(16)
Single Non-Inverting Channel with External Reference SOT23-5, MLP6
Single 2A
FAN3100C
+2.5A / -1.8A
CMOS
Single Channel of Two-Input/One-Output
SOT23-5, MLP6
Single 2A
FAN3100T
+2.5A / -1.8A
TTL
Single Channel of Two-Input/One-Output
SOT23-5, MLP6
Dual 2A
FAN3216T
+2.4A / -1.6A
TTL
Dual Inverting Channels
SOIC8
Dual 2A
FAN3217T
+2.4A / -1.6A
TTL
Dual Non-Inverting Channels
SOIC8
Dual 2A
FAN3226C
+2.4A / -1.6A
CMOS
Dual Inverting Channels + Dual Enable
SOIC8, MLP8
Dual 2A
FAN3226T
+2.4A / -1.6A
TTL
Dual Inverting Channels + Dual Enable
SOIC8, MLP8
Dual 2A
FAN3227C
+2.4A / -1.6A
CMOS
Dual Non-Inverting Channels + Dual Enable
SOIC8, MLP8
Dual 2A
FAN3227T
+2.4A / -1.6A
TTL
Dual Non-Inverting Channels + Dual Enable
SOIC8, MLP8
Dual 2A
FAN3228C
+2.4A / -1.6A
CMOS
Dual Channels of Two-Input/One-Output, Pin Config.1
SOIC8, MLP8
Dual 2A
FAN3228T
+2.4A / -1.6A
TTL
Dual Channels of Two-Input/One-Output, Pin Config.1
SOIC8, MLP8
Dual 2A
FAN3229C
+2.4A / -1.6A
CMOS
Dual Channels of Two-Input/One-Output, Pin Config.2
SOIC8, MLP8
Dual 2A
FAN3229T
+2.4A / -1.6A
TTL
Dual Channels of Two-Input/One-Output, Pin Config.2
SOIC8, MLP8
Dual 2A
FAN3268T
+2.4A / -1.6A
TTL
20V Non-Inverting Channel (NMOS) and Inverting
Channel (PMOS) + Dual Enables
SOIC8
Dual 2A
FAN3278T
+2.4A / -1.6A
TTL
30V Non-Inverting Channel (NMOS) and Inverting
Channel (PMOS) + Dual Enables
SOIC8
Dual 4A
FAN3213T
+2.5A / -1.8A
TTL
Dual Inverting Channels
SOIC8
Dual 4A
FAN3214T
+2.5A / -1.8A
TTL
Dual Non-Inverting Channels
SOIC8
Dual 4A
FAN3223C
+4.3A / -2.8A
CMOS
Dual Inverting Channels + Dual Enable
SOIC8, MLP8
Dual 4A
FAN3223T
+4.3A / -2.8A
TTL
Dual Inverting Channels + Dual Enable
SOIC8, MLP8
Dual 4A
FAN3224C
+4.3A / -2.8A
CMOS
Dual Non-Inverting Channels + Dual Enable
SOIC8, MLP8
Dual 4A
FAN3224T
+4.3A / -2.8A
TTL
Dual Non-Inverting Channels + Dual Enable
SOIC8, MLP8
Dual 4A
FAN3225C
+4.3A / -2.8A
CMOS
Dual Channels of Two-Input/One-Output
SOIC8, MLP8
Dual 4A
FAN3225T
+4.3A / -2.8A
TTL
Dual Channels of Two-Input/One-Output
SOIC8, MLP8
Single 9A
FAN3121C
+9.7A / -7.1A
CMOS
Single Inverting Channel + Enable
SOIC8, MLP8
Single 9A
FAN3121T
+9.7A / -7.1A
TTL
Single Inverting Channel + Enable
SOIC8, MLP8
Single 9A
FAN3122T
+9.7A / -7.1A
CMOS
Single Non-Inverting Channel + Enable
SOIC8, MLP8
Single 9A
FAN3122C
+9.7A / -7.1A
TTL
Single Non-Inverting Channel + Enable
SOIC8, MLP8
Notes:
15. Typical currents with OUTx at 6V and VDD=12V.
16. Thresholds proportional to an externally supplied reference voltage.
© 2007 Fairchild Semiconductor Corporation
FAN3223 / FAN3224 / FAN3225 • Rev. 1.0.5
www.fairchildsemi.com
22
FAN3223 / FAN3224 / FAN3225 — Dual 4A High-Speed, Low-Side Gate Drivers
Table 1.
2X
2X
0.8 MAX
RECOMMENDED LAND PATTERN
0.05
0.00
SEATING
PLANE
A. CONFORMS TO JEDEC REGISTRATION MO-229,
VARIATION VEEC, DATED 11/2001
B. DIMENSIONS ARE IN MILLIMETERS.
C. DIMENSIONS AND TOLERANCES PER
ASME Y14.5M, 1994
D. FILENAME: MKT-MLP08Drev2
Figure 57. 3x3mm, 8-Lead Molded Leadless Package (MLP)
Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner
without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or
obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions,
specifically the warranty therein, which covers Fairchild products.
Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings:
http://www.fairchildsemi.com/packaging/
© 2007 Fairchild Semiconductor Corporation
FAN3223 / FAN3224 / FAN3225 • Rev. 1.0.5
www.fairchildsemi.com
23
FAN3223 / FAN3224 / FAN3225 — Dual 4A High-Speed, Low-Side Gate Drivers
Physical Dimensions
5.00
4.80
A
0.65
3.81
8
5
B
6.20
5.80
PIN ONE
INDICATOR
1.75
4.00
3.80
1
5.60
4
1.27
(0.33)
0.25
M
1.27
C B A
LAND PATTERN RECOMMENDATION
0.25
0.10
SEE DETAIL A
1.75 MAX
0.25
0.19
C
0.10
0.51
0.33
0.50 x 45°
0.25
R0.10
C
OPTION A - BEVEL EDGE
GAGE PLANE
R0.10
OPTION B - NO BEVEL EDGE
0.36
NOTES: UNLESS OTHERWISE SPECIFIED
8°
0°
0.90
0.406
A) THIS PACKAGE CONFORMS TO JEDEC
MS-012, VARIATION AA, ISSUE C,
B) ALL DIMENSIONS ARE IN MILLIMETERS.
C) DIMENSIONS DO NOT INCLUDE MOLD
FLASH OR BURRS.
D) LANDPATTERN STANDARD: SOIC127P600X175-8M.
E) DRAWING FILENAME: M08AREV13
SEATING PLANE
(1.04)
DETAIL A
SCALE: 2:1
Figure 58. 8-Lead SOIC
Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner
without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or
obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions,
specifically the warranty therein, which covers Fairchild products.
Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings:
http://www.fairchildsemi.com/packaging/
© 2007 Fairchild Semiconductor Corporation
FAN3223 / FAN3224 / FAN3225 • Rev. 1.0.5
www.fairchildsemi.com
24
FAN3223 / FAN3224 / FAN3225 — Dual 4A High-Speed, Low-Side Gate Drivers
Physical Dimensions (Continued)
FAN3223 / FAN3224 / FAN3225 — Dual 4A High-Speed, Low-Side Gate Drivers
© 2007 Fairchild Semiconductor Corporation
FAN3223 / FAN3224 / FAN3225 • Rev. 1.0.5
www.fairchildsemi.com
25