© Semiconductor Components Industries, LLC, 2006
May, 2006 Rev. 16
1Publication Order Number:
NCV4276/D
NCV4276, NCV4276A
400 mA Low−Drop Voltage
Regulator
The NCV4276 is a 400 mA output current integrated low dropout
regulator family designed for use in harsh automotive environments.
It includes wide operating temperature and input voltage ranges. The
device is offered with fixed output voltage options of 1.8 V, 2.5 V,
and 3.3 V with 4% output voltage accuracy while the 5.0 V and
adjustable voltage versions are available either in 2% or 4% output
voltage accuracy. It has a high peak input voltage tolerance and
reverse input voltage protection. It also provides overcurrent
protection, overtemperature protection and inhibit for control of the
state of the output voltage. The NCV4276 family is available in
DPAK and D2PAK surface mount packages. The output is stable over
a wide output capacitance and ESR range.
Features
3.3 V, 2.5 V, 1.8 V ±4% Output Voltage
5.0 V and Adjustable Voltage Version (from 2.5 V to 20 V) ±4% or
±2% Output Voltage
400 mA Output Current
500 mV (max) Dropout Voltage (5.0 V Output)
Inhibit Input
Very Low Current Consumption
Fault Protection
+45 V Peak Transient Voltage
42 V Reverse Voltage
Short Circuit
Thermal Overload
NCV Prefix for Automotive and Other Applications Requiring Site
and Control Changes
PbFree Packages are Available
Pin 1. I
2. INH
Tab, 3. GND*
4. VA
5. Q
D2PAK
5PIN
DS SUFFIX
CASE 936A
1
5
DPAK
5PIN
DT SUFFIX
CASE 175AA
15
MARKING DIAGRAMS
1
1
A = Assembly Location
WL, L = Wafer Lot
Y = Year
WW = Work Week
G = PbFree Device
x, xx = Voltage Ratings as
indicated below
See detailed ordering and shipping information in the ordering
information section on page 17 of this data sheet.
ORDERING INFORMATION
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4276XG
ALYWW
NC
V4276XX
AWLYWWG
DPAK
XX = AJ (Adj. Voltage)
D2PAK
XX = AJ (Adj. Voltage)
76AXXG
ALYWW
1
1
NC
V4276AXX
AWLYWWG
NCV4276A NCV4276
NCV4276A NCV4276
Pin 1. I
2. INH
Tab, 3. GND*
4. NC
5. Q
* Tab is connected to Pin 3 on all packages.
AVersion
DPAK
X = V (Adj. Voltage)
X = 5 (5.0 V)
X = 3 (3.3 V)
D2PAK
XX = AJ (Adj. Voltage)
XX = 50 (5.0 V)
XX = 33 (3.3 V)
XX = 25 (2.5 V)
XX = 18 (1.8 V)
NonAVersion
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2
+
I
INH
Q
GND
Current Limit and
Saturation Sense
Bandgap
Reference
Thermal
Shutdown
Figure 1. 4276 Block Diagram
Error
Amplifier
NC
+
I
INH
Q
GND
Current Limit and
Saturation Sense
Bandgap
Reference
Thermal
Shutdown
Figure 2. 4276 Adjustable Block Diagram
Error
Amplifier
VA
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PIN FUNCTION DESCRIPTION
Pin No. Symbol Description
1 I Input; Battery Supply Input Voltage.
2 INH Inhibit; Set lowto inhibit.
3 GND Ground; Pin 3 internally connected to heatsink.
4NC / VA Not connected for fixed voltage version / Voltage Adjust Input for adjustable voltage version; use an external
voltage divider to set the output voltage
5 Q Use 22 mF, ESR < 2.5 W at 10 kHz to ground with the 5.0 V and adjustable regulators. See Figures 3, 4, and 5.
Use 10 mF, ESR < 1.8 W at 10 kHz to ground with the 3.3 V, 2.5 V, and 1.8 V regulators. See Figures 3 and 6.
MAXIMUM RATINGS*
Rating Symbol Min Max Unit
Input Voltage VI42 45 V
Input Peak Transient Voltage VI45 V
Inhibit INH Voltage VINH 42 45 V
Output Voltage VQ1.0 40 V
Ground Current Iq100 mA
Input Voltage Operating Range VIVQ + 0.5 V or 4.5 V
(Note 1)
40 V
ESD Susceptibility (Human Body Model)
(Machine Model)
(Charged Device Model)
4.5
250
1.25
kV
V
kV
Junction Temperature TJ40 150 °C
Storage Temperature Tstg 50 150 °C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
*During the voltage range which exceeds the maximum tested voltage of I, operation is assured, but not specified. Wider limits may apply. Thermal
dissipation must be observed closely.
LEAD TEMPERATURE SOLDERING REFLOW (Note 2)
Lead Temperature Soldering
Reflow (SMD styles only), Leaded, 60150 s above 183, 30 s max at peak
Reflow (SMD styles only), Lead Free, 60150 s above 217, 40 s max at peak
Wave Solder (through hole styles only), 12 sec max
TSLD
240
265
310
°C
THERMAL CHARACTERISTICS
Characteristic Test Conditions (Typical Value) Unit
DPAK 5PIN PACKAGE
Min Pad Board (Note 3) 1, Pad Board (Note 4)
JunctiontoTab (psiJLx, yJLx) 4.2 4.7 C/W
JunctiontoAmbient (RqJA, qJA) 100.9 46.8 C/W
D2PAK 5PIN PACKAGE
0.4 sq. in. Spreader Board (Note 5) 1.2 sq. in. Spreader Board (Note 6)
JunctiontoTab (psiJLx, yJLx) 3.8 4.0 C/W
JunctiontoAmbient (RqJA, qJA) 74.8 41.6 C/W
1. Minimum VI = 4.5 V or (VQ + 0.5 V), whichever is higher.
2. Per IPC / JEDEC JSTD020C.
3. 1 oz. copper, 0.26 inch2 (168 mm2) copper area, 0.062thick FR4.
4. 1 oz. copper, 1.14 inch2 (736 mm2) copper area, 0.062thick FR4.
5. 1 oz. copper, 0.373 inch2 (241 mm2) copper area, 0.062thick FR4.
6. 1 oz. copper, 1.222 inch2 (788 mm2) copper area, 0.062thick FR4.
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ELECTRICAL CHARACTERISTICS (VI = 13.5 V; 40°C < TJ < 150°C; unless otherwise noted.)
Characteristic Symbol Test Conditions
NCV4276 NCV4276A
Unit
Min Typ Max Min Typ Max
Output
Output Voltage, 5.0 V Version VQ5.0 mA < IQ < 400 mA,
6.0 V < VI < 28 V
4.8 5.0 5.2 4.9 5.0 5.1 V
Output Voltage, 5.0 V Version VQ5.0 mA < IQ < 200 mA,
6.0 V < VI < 40 V
4.8 5.0 5.2 4.9 5.0 5.1 V
Output Voltage, 3.3 V Version VQ5.0 mA < IQ < 400 mA,
4.5 V < VI < 28 V
3.168 3.3 3.432 −−−V
Output Voltage, 3.3 V Version VQ5.0 mA < IQ < 200 mA,
4.5 V < VI < 40 V
3.168 3.3 3.432 −−−V
Output Voltage, 2.5 V Version VQ5.0 mA < IQ < 400 mA,
4.5 V < VI < 28 V
2.4 2.5 2.6 −−−V
Output Voltage, 2.5 V Version VQ5.0 mA < IQ < 200 mA,
4.5 V < VI < 40 V
2.4 2.5 2.6 −−−V
Output Voltage, 1.8 V Version VQ5.0 mA < IQ < 400 mA,
4.5 V < VI < 28 V
1.728 1.8 1.872 −−−V
Output Voltage, 1.8 V Version VQ5.0 mA < IQ < 200 mA,
4.5 V < VI < 40 V
1.728 1.8 1.872 −−−V
Output Voltage, Adjustable
Version
AVQ5.0 mA < IQ < 400 mA
VQ+1 < VI < 40 V
VI > 4.5 V
4% +4% 2% +2% V
Output Current Limitation IQVQ = 90% VQTYP (VQTYP
= 2.5 V for ADJ version)
400 700 1100 400 700 1100 mA
Quiescent Current (Sleep Mode)
Iq = II IQ
IqVINH = 0 V 10 10 mA
Quiescent Current, Iq = II IQIqIQ = 1.0 mA 130 220 130 200 mA
Quiescent Current, Iq = II IQIqIQ = 250 mA 10 15 10 15 mA
Quiescent Current, Iq = II IQIqIQ = 400 mA 25 35 25 35 mA
Dropout Voltage,
5.0 V Version
3.3 V Version
2.5 V Version
1.8 V Version
Adjustable Version
VDR IQ = 250 mA,
VDR = VI VQ
VI = 5.5 V
VI = 4.5 V
VI = 4.5 V
VI = 4.5 V
VI > 4.5 V
250
250
500
1.332
2.1
2.772
500
250
500
mV
V
V
V
mV
Dropout Voltage (5.0 V Version) VDR IQ = 250 mA −−−−250 500 mV
Load Regulation DVQ,LO IQ = 5.0 mA to 400 mA 10 35 3.0 20 mV
Line Regulation DVQDVI = 12 V to 32 V,
IQ = 5.0 mA
2.5 25 4.0 15 mV
Power Supply Ripple Rejection PSRR fr = 100 Hz, Vr = 0.5 Vpp 60 54 dB
Temperature Output Voltage Drift dVQ/dT 0.5 0.5 mV/K
Inhibit
Inhibit Voltage, Output High VINH VQ w VQMIN 2.8 3.5 2.3 3.5 V
Inhibit Voltage, Output Low (Off) VINH VQ v 0.1 V 0.5 1.7 0.5 2.2 V
Input Current IINH VINH = 5.0 V 5.0 10 20 5.0 10 20 mA
THERMAL SHUTDOWN
Characteristic Symbol Test Conditions Min Typ Max Min Typ Max Unit
Thermal Shutdown Temperature* TSD IQ = 5.0 mA 150 210 150 210 °C
*Guaranteed by design, not tested in production.
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5.5 45 V
Input CI1
100 mF
CI2
100 nF
III
INH
1
2
5
4
3
GND
CQ
22 mF
IQ
Q
NC
Output
Figure 3. Applications Circuit; Fixed Voltage Version
NCV4276
RL
IINH
Input CI1
100 mF
CI2
100 nF
III
INH
1
2
5
4
3
GND
CQ
22 mF
IQ
Q
VA
Output
Figure 4. Applications Circuit; Adjustable Voltage Version
NCV4276
NCV4276A
RL
IINH
R1
R2
VQ = [(R1 + R2) * Vref] / R2
TYPICAL PERFORMANCE CHARACTERISTICS
Figure 5. Output Stability with Output Capacitor
ESR, 5.0 V and Adjustable Regulator
0.01
0.1
1
10
100
1000
OUTPUT CURRENT (mA)
ESR (W)
Unstable ESR Region for
CQ = 1 mF 22 mF
Stable ESR Region
0 150 250 35050 450
Maximum ESR for
CQ = 1 mF 22 mF
100 200 300 400
Figure 6. Output Stability with Output Capacitor
ESR, 1.8 V, 2.5 V, 3.3 V Regulators
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
0 50 100 150 200 250 300 350 400 450
ESR (W)
CQ = 10 mF for these
Output Voltages
Stable Region
OUTPUT CURRENT (mA)
Unstable Region
3.3 V
2.5 V
1.8 V
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TYPICAL PERFORMANCE CHARACTERISTICS 4276 Version
4.8
4.9
5.0
5.1
5.2
40 0 40 80 120 160
TJ (°C)
VQ, (V)
VI = 13.5 V, RL = 1000 W
0
5
10
15
20
25
30
35
40
45
01020304050
VI (V)
Iq, (mA)
0
1
2
3
4
5
6
0246810
VI (V)
VQ, (V)
TJ = 25°C
RL = 20 W
TJ = 25°C
RL = 20 W
8
6
4
2
0
2
4
6
50 25 0 25 5
0
VI (V)
II, (mA)
TJ = 25°C
RL = 6.8 kW
Figure 7. Output Voltage VQ versus
Temperature TJ, 5.0 V Regulator
Figure 8. Current Consumption Iq versus Input
Voltage VI, 5.0 V Regulator
Figure 9. Low Voltage Behavior, 5.0 V Regulator Figure 10. High Voltage Behavior, 5.0 V Regulator
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TYPICAL PERFORMANCE CHARACTERISTICS 4276 Version
0
100
200
300
400
500
600
700
800
0 1020304050
VI (V)
IQ, (mA)
TJ = 25°C
VQ = 0 V
0
100
200
300
400
500
600
0 50 100 150 200 250 300 350 400
VDR, (mV)
IQ (mA)
TJ = 25°C
TJ = 125°C
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
0 102030405060
IQ (mA)
Iq, (mA)
TJ = 25°C
VI = 13.5 V
0
10
20
30
40
50
60
0 100 200 300 400 500 600
IQ (mA)
Iq, (mA)
TJ = 25°C
VI = 13.5 V
Figure 11. Voltage Drop VDR versus Output
Current IQ, 5.0 V Regulator
Figure 12. Maximum Output Current IQ versus
Input Voltage VI, 5.0 V Regulator
Figure 13. Current Consumption Iq versus
Output Current IQ (High Load), 5.0 V Regulator
Figure 14. Current Consumption Iq versus
Output Current IQ (Low Load), 5.0 V Regulator
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TYPICAL PERFORMANCE CHARACTERISTICS 4276A Version
Figure 15. Output Voltage vs. Junction
Temperature, 5.0 V Regulator
Figure 16. Low Voltage Behavior, 5.0 V
Regulator
TJ, JUNCTION TEMPERATURE (°C) VI, INPUT VOLTAGE (V)
1601208040040
4.8
4.9
5.0
5.1
5.2
108.06.04.02.00
0
1.0
2.0
3.0
4.0
5.0
6.0
Figure 17. Output Current vs. Input Voltage,
5.0 V Regulator
Figure 18. Current Consumption vs. Output
Current (High Load), 5.0 V Regulator
VI, INPUT VOLTAGE (V) IQ, OUTPUT CURRENT (mA)
50403020100
0
200
400
600
800
6005004003002001000
0
10
20
30
40
50
60
Figure 19. Current Consumption vs. Output
Current (Low Load), 5.0 V Regulator
Figure 20. Drop Voltage vs. Output Current,
5.0 V Regulator
IQ, OUTPUT CURRENT (mA) IQ, OUTPUT CURRENT (mA)
6050403020100
0
0.2
0.4
0.6
0.8
1.2
1.4
1.6
4003002001000
0
100
200
300
400
500
600
VQ, OUTPUT VOLTAGE (V)
VI = 13.5 V
RL = 1 kW
VQ, OUTPUT VOLTAGE (V)
RL = 20 W
TJ = 25°C
IQ, OUTPUT CURRENT (mA)
TJ = 25°C
VQ = 0 V
Iq, CURRENT CONSUMPTION (mA)
VI = 13.5 V
TJ = 25°C
1.0
Iq, CURRENT CONSUMPTION (mA)
VI = 13.5 V
VDR, DROP VOLTAGE (mV)
TJ = 125°C
TJ = 25°C
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TYPICAL PERFORMANCE CHARACTERISTICS 4276A Version
Figure 21. Current Consumption vs. Input
Voltage, 5.0 V Regulator
Figure 22. High Voltage Behavior,
5.0 V Regulator
VI, INPUT VOLTAGE (V) VI, INPUT VOLTAGE (V)
50403020100
0
10
20
30
40
502502550
10
8.0
6.0
2.0
0
2.0
6.0
Iq, CURRENT CONSUMPTION (mA)
TJ = 25°C
RL = 20 W
II (mA)
RL = 6.8 kW
TJ = 25°C
4.0
4.0
TYPICAL PERFORMANCE CHARACTERISTICS Adjustable Version
2.45
2.46
2.47
2.51
2.55
40 0 40 80 120 160
TJ (°C)
VQ (V)
VI = 13.5 V, RL = 1 kW
0
0.5
1
1.5
2
2.5
3
3.5
4
0246 810
VI (V)
VQ (V)
0
100
200
300
400
500
800
0 1020304050
VI (V)
IQ (mA)
TJ = 25°C
RL = 20 W
TJ = 25°C
VQ = 0 V
0
10
20
30
40
50
60
0 100 200 300 400
IQ (mA)
IQ (mA)
TJ = 25°C
VI = 13.5 V
Figure 23. Output Voltage vs. Temperature,
Adjustable Version
Figure 24. Low Voltage Behavior, Adjustable
Version
Figure 25. Maximum Output Current vs. Input
Voltage, Adjustable Version
Figure 26. Current Consumption vs. Output
Current (High Load), Adjustable Version
2.48
2.49
2.50
2.52
2.53
2.54
600
700
500 600
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TYPICAL PERFORMANCE CHARACTERISTICS Adjustable Version
0
0.2
0.4
1.6
0 10203040 60
IQ (mA)
Iq (mA)
TJ = 25°C
0
100
200
300
400
500
600
0 50 100 150 350 400
IQ (mA)
VDR (mV)
0
0.5
1.0
1.5
2.0
3.0
5.0
0 1020304050
VI (V)
Iq (mA)
TJ = 25°C
VI = 13.5 V
TJ = 25°C
RL = 20 W
18
16
14
8
6
4
2
50 25 0 25
VI (V)
II (mA)
TJ = 25°C
RL = 6.8 kW
Figure 27. Current Consumption vs. Output
Current (Low Load), Adjustable Version
Figure 28. Voltage Drop vs. Output Current,
Regulator set at 5.0 V, Adjustable Version
Figure 29. Current Consumption vs. Input
Voltage, Adjustable Version
Figure 30. High Voltage Behavior, Adjustable
Version
0.6
0.8
1.0
1.2
1.4
3.5
4.0
50
50 200 250 300
TJ = 125°C
2.5
4.5
12
10
2
0
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Circuit Description
The NCV4276 is an integrated low dropout regulator that
provides a regulated voltage at 400 mA to the output. It is
enabled with an input to the inhibit pin. The regulator
voltage is provided by a PNP pass transistor controlled by
an error amplifier with a bandgap reference, which gives it
the lowest possible dropout voltage. The output current
capability is 400 mA, and the base drive quiescent current
is controlled to prevent oversaturation when the input
voltage is low or when the output is overloaded. The
regulator is protected by both current limit and thermal
shutdown. Thermal shutdown occurs above 150°C to
protect the IC during overloads and extreme ambient
temperatures.
Regulator
The error amplifier compares the reference voltage to a
sample of the output voltage (VQ) and drives the base of a
PNP series pass transistor via a buffer. The reference is a
bandgap design to give it a temperaturestable output.
Saturation control of the PNP is a function of the load
current and input voltage. Oversaturation of the output
power device is prevented, and quiescent current in the
ground pin is minimized. See Figure 5, Test Circuit, for
circuit element nomenclature illustration.
Regulator Stability Considerations
The input capacitors (CI1 and CI2) are necessary to
stabilize the input impedance to avoid voltage line
influences. Using a resistor of approximately 1.0 W in
series with CI2 can stop potential oscillations caused by
stray inductance and capacitance.
The output capacitor helps determine three main
characteristics of a linear regulator: startup delay, load
transient response and loop stability. The capacitor value
and type should be based on cost, availability, size and
temperature constraints. A tantalum or aluminum
electrolytic capacitor is best, since a film or ceramic
capacitor with its almost zero ESR can cause instability.
The aluminum electrolytic capacitor is the least expensive
solution, but, if the circuit operates at low temperatures
(25°C to 40°C), both the value and ESR of the capacitor
will vary considerably. The capacitor manufacturers data
sheet usually provides this information.
The value for the output capacitor CQ, shown in Figure 3,
should work for most applications; however, it is not
necessarily the optimized solution. Stability is guaranteed
for CQ w 22 mF and an ESR v 2.5 W for the 5.0 V and
Adjustable regulator and CQ w 10 mF and an ESR v 1.8 W
for the 1.8 V, 2.5 V, and 3.3 V regulators. See Figures 5 and
6 for output stability at various load and capacitive ESR
conditions.
Inhibit Input
The inhibit pin is used to turn the regulator on or off. By
holding the pin down to a voltage less than 0.5 V, the output
of the regulator will be turned off. When the voltage on the
Inhibit pin is greater than 3.5 V, the output of the regulator
will be enabled to power its output to the regulated output
voltage. The inhibit pin may be connected directly to the
input pin to give constant enable to the output regulator.
Setting the Output Voltage (Adjustable Version)
The output voltage range of the adjustable version can be
set between 2.5 V and 20 V (Figure ). This is accomplished
with an external resistor divider feeding back the voltage
to the IC back to the error amplifier by the voltage adjust
pin VA. The internal reference voltage is set to a
temperature stable reference of 2.5 V.
The output voltage is calculated from the following
formula. Ignoring the bias current into the VA pin:
VQ+[(R1 )R2) * Vref]ńR2
Use R2 < 50 k to avoid significant voltage output errors
due to VA bias current.
Connecting VA directly to Q without R1 and R2 creates
an output voltage of 2.5 V.
Designers should consider the tolerance of R1 and R2
during the design phase.
The input voltage range for operation (pin 1) of the
adjustable version is between (VQ + 0.5 V) and 40 V.
Internal bias requirements dictate a minimum input voltage
of 4.5 V. The dropout voltage for output voltages less than
4.0 V is (4.5 V VQ).
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Calculating Power Dissipation
in a Single Output Linear Regulator
The maximum power dissipation for a single output
regulator (Figure 31) is:
PD(max) +[VI(max) *VQ(min)]I
Q(max) (1)
)VI(max)Iq
where
VI(max) is the maximum input voltage,
VQ(min) is the minimum output voltage,
IQ(max) is the maximum output current for the
application,
Iq is the quiescent current the regulator
consumes at IQ(max).
Once the value of PD(max) is known, the maximum
permissible value of RqJA can be calculated:
RqJA +150°C*TA
PD(2)
The value of RqJA can then be compared with those in the
package section of the data sheet. Those packages with
RqJA less than the calculated value in Equation 2 will keep
the die temperature below 150°C.
In some cases, none of the packages will be sufficient to
dissipate the heat generated by the IC, and an external
heatsink will be required.
SMART
REGULATOR®
Iq
Control
Features
IQ
II
Figure 31. Single Output Regulator with Key
Performance Parameters Labeled
VIVQ
}
Heatsinks
A heatsink effectively increases the surface area of the
package to improve the flow of heat away from the IC and
into the surrounding air.
Each material in the heat flow path between the IC and
the outside environment will have a thermal resistance.
Like series electrical resistances, these resistances are
summed to determine the value of RqJA:
RqJA +RqJC )RqCS )RqSA (3)
where
RqJC is the junctiontocase thermal resistance,
RqCS is the casetoheatsink thermal resistance,
RqSA is the heatsinktoambient thermal
resistance.
RqJC appears in the package section of the data sheet.
Like RqJA, it too is a function of package type. RqCS and
RqSA are functions of the package type, heatsink and the
interface between them. These values appear in data sheets
of heatsink manufacturers.
Thermal, mounting, and heatsinking considerations are
discussed in the ON Semiconductor application note
AN1040/D.
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Thermal Model
A discussion of thermal modeling is in the ON Semiconductor web site: http://www.onsemi.com/pub/collateral/BR1487D.PDF.
Table 1. DPAK 5Lead Thermal RC Network Models
Drain Copper Area (1 oz thick) 168 mm2736 mm2168 mm2736 mm2
(SPICE Deck Format) Cauer Network Foster Network
168 mm2736 mm2Units Ta u Ta u Units
C_C1 Junction GND 1.00E06 1.00E06 Ws/C 1.36E08 1.361E08 sec
C_C2 node1 GND 1.00E05 1.00E05 Ws/C 7.41E07 7.411E07 sec
C_C3 node2 GND 6.00E05 6.00E05 Ws/C 1.04E05 1.029E05 sec
C_C4 node3 GND 1.00E04 1.00E04 Ws/C 3.91E05 3.737E05 sec
C_C5 node4 GND 4.36E04 3.64E04 Ws/C 1.80E03 1.376E03 sec
C_C6 node5 GND 6.77E02 1.92E02 Ws/C 3.77E01 2.851E02 sec
C_C7 node6 GND 1.51E01 1.27E01 Ws/C 3.79E+00 9.475E01 sec
C_C8 node7 GND 4.80E01 1.018 Ws/C 2.65E+01 1.173E+01 sec
C_C9 node8 GND 3.740 2.955 Ws/C 8.71E+01 8.59E+01 sec
C_C10 node9 GND 10.322 0.438 Ws/C sec
168 mm2736 mm2R’s R’s
R_R1 Junction node1 0.015 0.015 C/W 0.0123 0.0123 C/W
R_R2 node1 node2 0.08 0.08 C/W 0.0585 0.0585 C/W
R_R3 node2 node3 0.4 0.4 C/W 0.0304 0.0287 C/W
R_R4 node3 node4 0.2 0.2 C/W 0.3997 0.3772 C/W
R_R5 node4 node5 2.97519 2.6171 C/W 3.115 2.68 C/W
R_R6 node5 node6 8.2971 1.6778 C/W 3.571 1.38 C/W
R_R7 node6 node7 25.9805 7.4246 C/W 12.851 5.92 C/W
R_R8 node7 node8 46.5192 14.9320 C/W 35.471 7.39 C/W
R_R9 node8 node9 17.7808 19.2560 C/W 46.741 28.94 C/W
R_R10 node9 GND 0.1 0.1758 C/W C/W
NOTE: Bold face items represent the package without the external thermal system.
Junction R1
C1C2
R2
C3
R3
Cn
Rn
Time constants are not simple RC products. Amplitudes
of mathematical solution are not the resistance values.
Ambient
(thermal ground)
Figure 32. Grounded Capacitor Thermal Network (“Cauer” Ladder)
Junction R1
C1C2
R2
C3
R3
Cn
Rn
Each rung is exactly characterized by its RCproduct
time constant; amplitudes are the resistances.
Ambient
(thermal ground)
Figure 33. NonGrounded Capacitor Thermal Ladder (“Foster” Ladder)
NCV4276, NCV4276A
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14
Table 2. D2PAK 5Lead Thermal RC Network Models
Drain Copper Area (1 oz thick) 241 mm2788 mm2241 mm2788 mm2
(SPICE Deck Format) Cauer Network Foster Network
241 mm2653 mm2Units Ta u Ta u Units
C_C1 Junction GND 1.00E06 1.00E06 Ws/C 1.361E08 1.361E08 sec
C_C2 node1 GND 1.00E05 1.00E05 Ws/C 7.411E07 7.411E07 sec
C_C3 node2 GND 6.00E05 6.00E05 Ws/C 1.005E05 1.007E05 sec
C_C4 node3 GND 1.00E04 1.00E04 Ws/C 3.460E05 3.480E05 sec
C_C5 node4 GND 2.82E04 2.87E04 Ws/C 7.868E04 8.107E04 sec
C_C6 node5 GND 5.58E03 5.95E03 Ws/C 7.431E03 7.830E03 sec
C_C7 node6 GND 4.25E01 4.61E01 Ws/C 2.786E+00 2.012E+00 sec
C_C8 node7 GND 9.22E01 2.05 Ws/C 2.014E+01 2.601E+01 sec
C_C9 node8 GND 1.73 4.88 Ws/C 1.134E+02 1.218E+02 sec
C_C10 node9 GND 7.12 1.31 Ws/C sec
241 mm2653 mm2R’s R’s
R_R1 Junction node1 0.015 0.0150 C/W 0.0123 0.0123 C/W
R_R2 node1 node2 0.08 0.0800 C/W 0.0585 0.0585 C/W
R_R3 node2 node3 0.4 0.4000 C/W 0.0257 0.0260 C/W
R_R4 node3 node4 0.2 0.2000 C/W 0.3413 0.3438 C/W
R_R5 node4 node5 1.85638 1.8839 C/W 1.77 1.81 C/W
R_R6 node5 node6 1.23672 1.2272 C/W 1.54 1.52 C/W
R_R7 node6 node7 9.81541 5.3383 C/W 4.13 3.46 C/W
R_R8 node7 node8 33.1868 18.9591 C/W 6.27 5.03 C/W
R_R9 node8 node9 27.0263 13.3369 C/W 60.80 29.30 C/W
R_R10 node9 GND 1.13944 0.1191 C/W C/W
NOTE: Bold face items represent the package without the external thermal system.
The Cauer networks generally have physical significance and may be divided between nodes to separate thermal behavior
due to one portion of the network from another. The Foster networks, though when sorted by time constant (as above) bear
a rough correlation with the Cauer networks, are really only convenient mathematical models. Cauer networks can be easily
implemented using circuit simulating tools, whereas Foster networks may be more easily implemented using mathematical
tools (for instance, in a spreadsheet program), according to the following formula:
R(t) +
n
S
i+1Riǒ1etńtauiǓ
NCV4276, NCV4276A
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15
110
150
Figure 34. qJA vs. Copper Spreader Area,
DPAK 5Lead
Figure 35. qJA vs. Copper Spreader Area,
D2PAK 5Lead
100
90
80
70
60
50
40
30
200 250 300 350 400 450 500 550 600 650 700 750
COPPER AREA (mm2)
qJA (C°/W)
1 oz
2 oz
110
150
100
90
80
70
60
50
40
30
200 250 300 350 400 450 500 550 600 650 700 750
COPPER AREA (mm2)
qJA (C°/W)
1 oz
2 oz
100
10
1.0
0.1
0.01
TIME (sec)
R(t) C°/W
0.0000001 0.000001 0.00001 0.0001 0.001 0.01 0.1 1.0 10 100 1000
Cu Area 167 mm2
Cu Area 736 mm2
Figure 36. SinglePulse Heating Curves, DPAK 5Lead
100
10
1.0
0.1
0.01
TIME (sec)
R(t) C°/W
0.0000001 0.000001 0.00001 0.0001 0.001 0.01 0.1 1.0 10 100 1000
Cu Area 167 mm2
Cu Area 736 mm2
sqrt(t)
Figure 37. SinglePulse Heating Curves, D2PAK 5Lead
NCV4276, NCV4276A
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16
100
10
1.0
0.1
0.01
PULSE WIDTH (sec)
RqJA 788 mm2 C°/W
0.0000001 0.000001 0.00001 0.0001 0.001 0.01 0.1 1.0 10 100 1000
Nonnormalized Response
50% Duty Cycle
20%
10%
5%
2%
1%
100
10
1.0
0.1
0.01
PULSE WIDTH (sec)
RqJA 736 mm2 C°/W
0.0000001 0.000001 0.00001 0.0001 0.001 0.01 0.1 1.0 10 100 1000
Nonnormalized Response
50% Duty Cycle
Figure 38. Duty Cycle for 1, Spreader Boards, DPAK 5Lead
20%
10%
5%
2%
1%
Figure 39. Duty Cycle for 1, Spreader Boards, D2PAK 5Lead
NCV4276, NCV4276A
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17
ORDERING INFORMATION
Device Output Voltage Accuracy Output Voltage Package Shipping
NCV4276DT50RK
4%
5.0 V
DPAK, 5Pin 2500 / Tape & Reel
NCV4276DT50RKG DPAK, 5Pin
(PbFree)
2500 / Tape & Reel
NCV4276DS50 D2PAK, 5Pin 50 Units / Rail
NCV4276DS50G D2PAK, 5Pin
(PbFree)
50 Units / Rail
NCV4276DS50R4 D2PAK, 5Pin 800 / Tape & Reel
NCV4276DS50R4G D2PAK, 5Pin
(PbFree)
800 / Tape & Reel
NCV4276DT33RK
3.3 V
DPAK, 5Pin 2500 / Tape & Reel
NCV4276DT33RKG DPAK, 5Pin
(PbFree)
2500 / Tape & Reel
NCV4276DS33 D2PAK, 5Pin 50 Units / Rail
NCV4276DS33G D2PAK, 5Pin
(PbFree)
50 Units / Rail
NCV4276DS33R4 D2PAK, 5Pin 800 / Tape & Reel
NCV4276DS33R4G D2PAK, 5Pin
(PbFree)
800 / Tape & Reel
NCV4276DS25
2.5 V
D2PAK, 5Pin 50 Units / Rail
NCV4276DS25G D2PAK, 5Pin
(PbFree)
50 Units / Rail
NCV4276DS25R4 D2PAK, 5Pin 800 / Tape & Reel
NCV4276DS25R4G D2PAK, 5Pin
(PbFree)
800 / Tape & Reel
NCV4276DS18
1.8 V
D2PAK, 5Pin 50 Units / Rail
NCV4276DS18G D2PAK, 5Pin
(PbFree)
50 Units / Rail
NCV4276DS18R4 D2PAK, 5Pin 800 / Tape & Reel
NCV4276DS18R4G D2PAK, 5Pin
(PbFree)
800 / Tape & Reel
NCV4276DTADJRKG
Adjustable
DPAK, 5Pin
(PbFree)
2500 / Tape & Reel
NCV4276DSADJG D2PAK, 5Pin
(PbFree)
50 Units / Rail
NCV4276DSADJR4G 800 / Tape & Reel
NCV4276ADT50RKG
2%
5.0 V
DPAK, 5Pin
(PbFree)
2500 / Tape & Reel
NCV4276ADS50G D2PAK, 5Pin
(PbFree)
50 Units / Rail
NCV4276ADS50R4G 800 / Tape & Reel
NCV4276ADTADJRKG
Adjustable
DPAK, 5Pin
(PbFree)
2500 / Tape & Reel
NCV4276ADSADJG D2PAK, 5Pin
(PbFree)
50 Units / Rail
NCV4276ADSADJR4G 800 / Tape & Reel
For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
NCV4276, NCV4276A
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18
PACKAGE DIMENSIONS
D
A
K
B
R
V
S
F
L
G
5 PL
M
0.13 (0.005) T
E
C
U
J
H
TSEATING
PLANE
Z
DIM MIN MAX MIN MAX
MILLIMETERSINCHES
A0.235 0.245 5.97 6.22
B0.250 0.265 6.35 6.73
C0.086 0.094 2.19 2.38
D0.020 0.028 0.51 0.71
E0.018 0.023 0.46 0.58
F0.024 0.032 0.61 0.81
G0.180 BSC 4.56 BSC
H0.034 0.040 0.87 1.01
J0.018 0.023 0.46 0.58
K0.102 0.114 2.60 2.89
L0.045 BSC 1.14 BSC
R0.170 0.190 4.32 4.83
S0.025 0.040 0.63 1.01
U0.020 −−− 0.51 −−−
V0.035 0.050 0.89 1.27
Z0.155 0.170 3.93 4.32
NOTES:
1. DIMENSIONING AND TOLERANCING
PER ANSI Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
R1 0.185 0.210 4.70 5.33
R1
1234 5
DPAK 5, CENTER LEAD CROP
DT SUFFIX
CASE 175AA01
ISSUE A
6.4
0.252
0.8
0.031
10.6
0.417
5.8
0.228
SCALE 4:1 ǒmm
inchesǓ
0.34
0.013
5.36
0.217
2.2
0.086
SOLDERING FOOTPRINT
NCV4276, NCV4276A
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19
PACKAGE DIMENSIONS
D2PAK
5 LEAD
DS SUFFIX
CASE 936A02
ISSUE C
8.38
0.33
1.016
0.04
16.02
0.63
10.66
0.42
3.05
0.12
1.702
0.067
SCALE 3:1
ǒ
mm
inches
Ǔ
SOLDERING FOOTPRINT
5 REF
A
123
K
B
S
H
D
G
C
E
ML
P
N
R
V
U
TERMINAL 6
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. TAB CONTOUR OPTIONAL WITHIN DIMENSIONS A
AND K.
4. DIMENSIONS U AND V ESTABLISH A MINIMUM
MOUNTING SURFACE FOR TERMINAL 6.
5. DIMENSIONS A AND B DO NOT INCLUDE MOLD
FLASH OR GATE PROTRUSIONS. MOLD FLASH
AND GATE PROTRUSIONS NOT TO EXCEED 0.025
(0.635) MAXIMUM.
DIM
A
MIN MAX MIN MAX
MILLIMETERS
0.386 0.403 9.804 10.236
INCHES
B0.356 0.368 9.042 9.347
C0.170 0.180 4.318 4.572
D0.026 0.036 0.660 0.914
E0.045 0.055 1.143 1.397
G0.067 BSC 1.702 BSC
H0.539 0.579 13.691 14.707
K0.050 REF 1.270 REF
L0.000 0.010 0.000 0.254
M0.088 0.102 2.235 2.591
N0.018 0.026 0.457 0.660
P0.058 0.078 1.473 1.981
R5 REF
S0.116 REF 2.946 REF
U0.200 MIN 5.080 MIN
V0.250 MIN 6.350 MIN
__
45
M
0.010 (0.254) T
T
OPTIONAL
CHAMFER
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