SM72482
SM72482 SolarMagic Dual 5A Compound Gate Driver
Literature Number: SNVS696B
SM72482
May 9, 2011
SolarMagic Dual 5A Compound Gate Driver
General Description
The SM72482 Dual Gate Driver replaces industry standard
gate drivers with improved peak output current and efficiency.
Each “compound” output driver stage includes MOS and bipo-
lar transistors operating in parallel that together sink more
than 5A peak from capacitive loads. Combining the unique
characteristics of MOS and bipolar devices reduces drive cur-
rent variation with voltage and temperature. Under-voltage
lockout protection is also provided. The drivers can be oper-
ated in parallel with inputs and outputs connected to double
the drive current capability. This device is available in the
SOIC-8 package.
Features
■Renewable Energy Grade
■Independently drives two N-Channel MOSFETs
■Compound CMOS and bipolar outputs reduce output
current variation
■5A sink/3A source current capability
■Two channels can be connected in parallel to double the
drive current
■Independent inputs (TTL compatible)
■Fast propagation times (25 ns typical)
■Fast rise and fall times (14 ns/12 ns rise/fall with 2 nF load)
■Available in dual non-inverting, dual inverting and
combination configurations
■Supply rail under-voltage lockout protection (UVLO)
■SM72482 UVLO configured to drive PFET through OUT_A
and NFET through OUT_B
■Pin compatible with industry standard gate drivers
Typical Applications
■Synchronous Rectifier Gate Drivers
■Switch-mode Power Supply Gate Driver
■Solenoid and Motor Drivers
Packages
■SOIC-8
■Thermally Enhanced MSOP8–EP
Connection Diagram
30142201
SOIC-8, eMSOP-8
© 2011 National Semiconductor Corporation 301422 www.national.com
SM72482 SolarMagic Dual 5A Compound Gate Driver
Ordering Information
Order Number Package Type NSC Package Drawing Package Marking Supplied As
SM72482MY-1 MSOP–8–EP MUY08A SD8B 1000 Units in Tape and Reel
SM72482MYE-1 MSOP–8–EP MUY08A SD8B 250 Units in Tape and Reel
SM72482MYX-1 MSOP–8–EP MUY08A SD8B 3500 Units in Tape and Reel
SM72482MA-4 SOIC-8 M08A S482 95 Units in Rail
SM72482MAE-4 SOIC-8 M08A S482 250 Units in Tape and Reel
SM72482MAX-4 SOIC-8 M08A S482 2500 Units in Tape and Reel
Pin Descriptions
Pin Name Description Application Information
1 NC No Connect
2 IN_A ‘A’ side control input TTL compatible thresholds.
3 VEE Ground reference for both inputs and
outputs
Connect to power ground.
4 IN_B ‘B’ side control input TTL compatible thresholds.
5 OUT_B Output for the ‘B’ side driver. Voltage swing of this output is from VCC to VEE. The output
stage is capable of sourcing 3A and sinking 5A.
6 VCC Positive output supply Locally decouple to VEE.
7 OUT_A. Output for the ‘A’ side driver. Voltage swing of this output is from VCC to VEE. The output
stage is capable of sourcing 3A and sinking 5A.
8 NC No Connect
Configuration Table
Part Number “A” Output Configuration “B” Output Configuration Package
SM72482MY-1 Non-Inverting (Low in UVLO) Non-Inverting (Low in UVLO) MSOP8–EP
SM72482MA-4 Inverting (High in UVLO) Non-Inverting (Low in UVLO) SOIC-8
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SM72482
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
VCC to VEE −0.3V to 15V
IN to VEE −0.3V to 15V
Storage Temperature Range, (TSTG)−55°C to +150°C
Maximum Junction Temperature,
(TJ(max)) +150°C
Operating Junction Temperature +125°C
ESD Rating 2kV
Electrical Characteristics
TJ = −40°C to +125°C, VCC = 12V, VEE = 0V, No Load on OUT_A or OUT_B, unless otherwise specified.
Symbol Parameter Conditions Min Typ Max Units
VCC Operating Range VCC−VEE 3.5 14 V
VCCR VCC Under Voltage Lockout
(rising)
VCC−VEE 2.3 2.9 3.5 V
VCCH VCC Under Voltage Lockout
Hysteresis
230 mV
ICC VCC Supply Current (ICC) IN_A = IN_B = 0V (SM72482MY-1) 1 2
mA
IN_A = VCC, IN_B = 0V
(SM72482MA-4) 1 2
CONTROL INPUTS
VIH Logic High 2.2 V
VIL Logic Low 0.8 V
VthH High Threshold 1.3 1.75 2.2 V
VthL Low Threshold 0.8 1.35 2.0 V
HYS Input Hysteresis 400 mV
IIL Input Current Low IN_A=IN_B=VCC −1 0.1 1
µA
IIH Input Current High IN_A=IN_B=VCC(SM72482MY-1) 10 18 25
IN_B=VCC (SM72482MA-4) 10 18 25
IN_A=VCC (SM72482MA-4) -1 0.1 1
OUTPUT DRIVERS
ROH Output Resistance High IOUT = −10 mA (Note 2) 30 50 Ω
ROL Output Resistance Low IOUT = + 10 mA (Note 2) 1.4 2.5 Ω
ISource Peak Source Current OUTA/OUTB = VCC/2,
200 ns Pulsed Current 3 A
ISink Peak Sink Current OUTA/OUTB = VCC/2,
200 ns Pulsed Current 5 A
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SM72482
Symbol Parameter Conditions Min Typ Max Units
SWITCHING CHARACTERISTICS
td1 Propagation Delay Time Low to
High, IN rising (IN to OUT)
CLOAD = 2 nF, see Figure 1 25 40 ns
td2 Propagation Delay Time High to
Low, IN falling (IN to OUT)
CLOAD = 2 nF, see Figure 1 25 40 ns
trRise Time CLOAD = 2 nF, see Figure 1 14 25 ns
tfFall Time CLOAD = 2 nF, see Figure 1 12 25 ns
LATCHUP PROTECTION
AEC - Q100, Method 004 TJ = 150°C 500 mA
THERMAL RESISTANCE
θJA Junction to Ambient,
0 LFPM Air Flow
SOIC-8 Package 170 °C/W
MSOP8–EP Package 60
θJC Junction to Case SOIC-8 Package 70 °C/W
MSOP8–EP Package 4.7
Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the
device is intended to be functional. For guaranteed specifications and test conditions, see the Electrical Characteristics.
Note 2: The output resistance specification applies to the MOS device only. The total output current capability is the sum of the MOS and Bipolar devices.
Timing Waveforms
30142205
(a)
30142206
(b)
FIGURE 1. (a) Inverting, (b) Non-Inverting
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SM72482
Typical Performance Characteristics
Supply Current vs Frequency
30142210
Supply Current vs Capacitive Load
30142211
Rise and Fall Time vs Supply Voltage
30142212
Rise and Fall Time vs Temperature
30142213
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SM72482
Rise and Fall Time vs Capacitive Load
30142214
Delay Time vs Supply Voltage
30142215
Delay Time vs Temperature
30142216
RDSON vs Supply Voltage
30142217
UVLO Thresholds and Hysteresis vs Temperature
30142218
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SM72482
Block Diagram
30142203
Block Diagram of SM72482
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SM72482
Detailed Operating Description
The SM72482 dual gate driver consists of two independent
and identical driver channels with TTL compatible logic inputs
and high current totem-pole outputs that source or sink cur-
rent to drive MOSFET gates. The driver output consist of a
compound structure with MOS and bipolar transistor operat-
ing in parallel to optimize current capability over a wide output
voltage and operating temperature range. The bipolar device
provides high peak current at the critical threshold region of
the MOSFET VGS while the MOS devices provide rail-to-rail
output swing. The totem pole output drives the MOSFET gate
between the gate drive supply voltage VCC and the power
ground potential at the VEE pin.
The control inputs of the drivers are high impedance CMOS
buffers with TTL compatible threshold voltages. The
SM72482 pinout was designed for compatibility with industry
standard gate drivers in single supply gate driver applications.
The input stage of each driver should be driven by a signal
with a short rise and fall time. Slow rising and falling input
signals, although not harmful to the driver, may result in the
output switching repeatedly at a high frequency.
The two driver channels of the SM72482 are designed as
identical cells. Transistor matching inherent to integrated cir-
cuit manufacturing ensures that the AC and DC peformance
of the channels are nearly identical. Closely matched propa-
gation delays allow the dual driver to be operated as a single
with inputs and output pins connected. The drive current ca-
pability in parallel operation is precisely 2X the drive of an
individual channel. Small differences in switching speed be-
tween the driver channels will produce a transient current
(shoot-through) in the output stage when two output pins are
connected to drive a single load. Differences in input thresh-
olds between the driver channels will also produce a transient
current (shoot-through) in the output stage. Fast transition in-
put signals are especially important while operating in a par-
allel configuration. The efficiency loss for parallel operation
has been characterized at various loads, supply voltages and
operating frequencies. The power dissipation in the SM72482
increases less than 1% relative to the dual driver configuration
when operated as a single driver with inputs/ outputs con-
nected.
An Under Voltage Lock Out (UVLO) circuit is included in the
SM72482, which senses the voltage difference between
VCC and the chip ground pin, VEE. When the VCC to VEE volt-
age difference falls below 2.8V both driver channels are dis-
abled. The UVLO hysteresis prevents chattering during
brown-out conditions and the driver will resume normal oper-
ation when the VCC to VEE differential voltage exceeds ap-
proximately 3.0V.
The SM72482MY –1 device hold both outputs in the low state
in the under-voltage lockout (UVLO) condition. The
SM72482MA–4 has an active high output state of OUT_A
during UVLO. When VCC is less than the UVLO threshold
voltage, OUT_A will be locked in the high state while OUT_B
will be disabled in the low state. This configuration allows the
SM72482MY –4 to drive a PFET through OUT_A and an
NFET through OUT_B with both FETs safely turned off during
UVLO.
Layout Considerations
Attention must be given to board layout when using SM72482.
Some important considerations include:
1. A Low ESR/ESL capacitor must be connected close to
the IC and between the VCC and VEE pins to support high
peak currents being drawn from VCC during turn-on of the
MOSFET.
2. Proper grounding is crucial. The drivers need a very low
impedance path for current return to ground avoiding
inductive loops. The two paths for returning current to
ground are a) between SM72482 VEE pin and the ground
of the circuit that controls the driver inputs, b) between
SM72482 VEE pin and the source of the power MOSFET
being driven. All these paths should be as short as
possible to reduce inductance and be as wide as possible
to reduce resistance. All these ground paths should be
kept distinctly separate to avoid coupling between the
high current output paths and the logic signals that drive
the SM72482. A good method is to dedicate one copper
plane in a multi-layered PCB to provide a common
ground surface.
3. With the rise and fall times in the range of 10 ns to 30 ns,
care is required to minimize the lengths of current
carrying conductors to reduce their inductance and EMI
from the high di/dt transients generated by the SM72482.
4. The SM72482 footprint is compatible with other industry
standard drivers including the TC4426/27/28 and
UCC27323/4/5.
5. If either channel is not being used, the respective input
pin (IN_A or IN_B) should be connected to either VEE or
VCC to avoid spurious output signals.
Thermal Performance
INTRODUCTION
The primary goal of thermal management is to maintain the
integrated circuit (IC) junction temperature (TJ) below a spec-
ified maximum operating temperature to ensure reliability. It
is essential to estimate the maximum TJ of IC components in
worst case operating conditions. The junction temperature is
estimated based on the power dissipated in the IC and the
junction to ambient thermal resistance θJA for the IC package
in the application board and environment. The θJA is not a
given constant for the package and depends on the printed
circuit board design and the operating environment.
DRIVE POWER REQUIREMENT CALCULATIONS IN
SM72482
The SM72482 dual low side MOSFET driver is capable of
sourcing/sinking 3A/5A peak currents for short intervals to
drive a MOSFET without exceeding package power dissipa-
tion limits. High peak currents are required to switch the
MOSFET gate very quickly for operation at high frequencies.
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SM72482
30142207
FIGURE 2.
The schematic above shows a conceptual diagram of the
SM72482 output and MOSFET load. Q1 and Q2 are the
switches within the gate driver. RG is the gate resistance of
the external MOSFET, and CIN is the equivalent gate capac-
itance of the MOSFET. The gate resistance Rg is usually very
small and losses in it can be neglected. The equivalent gate
capacitance is a difficult parameter to measure since it is the
combination of CGS (gate to source capacitance) and CGD
(gate to drain capacitance). Both of these MOSFET capaci-
tances are not constants and vary with the gate and drain
voltage. The better way of quantifying gate capacitance is the
total gate charge QG in coloumbs. QG combines the charge
required by CGS and CGD for a given gate drive voltage
VGATE.
Assuming negligible gate resistance, the total power dissi-
pated in the MOSFET driver due to gate charge is approxi-
mated by
PDRIVER = VGATE x QG x FSW
Where
FSW = switching frequency of the MOSFET.
For example, consider the MOSFET MTD6N15 whose gate
charge specified as 30 nC for VGATE = 12V.
The power dissipation in the driver due to charging and dis-
charging of MOSFET gate capacitances at switching frequen-
cy of 300 kHz and VGATE of 12V is equal to
PDRIVER = 12V x 30 nC x 300 kHz = 0.108W.
If both channels of the SM72482 are operating at equal fre-
quency with equivalent loads, the total losses will be twice as
this value which is 0.216W.
In addition to the above gate charge power dissipation, - tran-
sient power is dissipated in the driver during output transi-
tions. When either output of the SM72482 changes state,
current will flow from VCC to VEE for a very brief interval of time
through the output totem-pole N and P channel MOSFETs.
The final component of power dissipation in the driver is the
power associated with the quiescent bias current consumed
by the driver input stage and Under-voltage lockout sections.
Characterization of the SM72482 provides accurate esti-
mates of the transient and quiescent power dissipation com-
ponents. At 300 kHz switching frequency and 30 nC load used
in the example, the transient power will be 8 mW. The 1 mA
nominal quiescent current and 12V VGATE supply produce a
12 mW typical quiescent power.
Therefore the total power dissipation
PD = 0.216 + 0.008 + 0.012 = 0.236W.
We know that the junction temperature is given by
TJ = PD x θJA + TA
Or the rise in temperature is given by
TRISE = TJ − TA = PD x θJA
For SOIC-8 package θJA is estimated as 170°C/W for the
conditions of natural convection. For MSOP8-EP θJA is typi-
cally 60°C/W.
Therefore for SOIC TRISE is equal to
TRISE = 0.236 x 170 = 40.1°C
CONTINUOUS CURRENT RATING OF SM72482
The SM72482 can deliver pulsed source/sink currents of 3A
and 5A to capacitive loads. In applications requiring continu-
ous load current (resistive or inductive loads), package power
dissipation, limits the SM72482 current capability far below
the 5A sink/3A source capability. Rated continuous current
can be estimated both when sourcing current to or sinking
current from the load. For example when sinking, the maxi-
mum sink current can be calculated as:
where RDS(on) is the on resistance of lower MOSFET in the
output stage of SM72482.
Consider TJ(max) of 125°C and θJA of 170°C/W for an SO-8
package under the condition of natural convection and no air
flow. If the ambient temperature (TA) is 60°C, and the RDS(on)
of the SM72482 output at TJ(max) is 2.5Ω, this equation yields
ISINK(max) of 391mA which is much smaller than 5A peak
pulsed currents.
Similarly, the maximum continuous source current can be
calculated as
where VDIODE is the voltage drop across hybrid output stage
which varies over temperature and can be assumed to be
about 1.1V at TJ(max) of 125°C. Assuming the same param-
eters as above, this equation yields ISOURCE(max) of 347mA.
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SM72482
Physical Dimensions inches (millimeters) unless otherwise noted
NOTES: UNLESS OTHERWISE SPECIFIED
1. STANDARD LEAD FINISH TO BE 200 MICROINCHES/5.08 MICROMETERS MINIMUM LEAD/TIN(SOLDER) ON COPPER.
2. DIMENSION DOES NOT INCLUDE MOLD FLASH.
3. REFERENCE JEDEC REGISTRATION MS-012, VARIATION AA, DATED MAY 1990.
8-Lead SOIC Package
NS Package Number M08A
8-Lead Exposed Pad MSOP Package
NS Package Number MUY08A
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SM72482
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SM72482
Notes
SM72482 SolarMagic Dual 5A Compound Gate Driver
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