ON NCP7800 1.0 a positive voltage regulator Datasheet

NCP7800
1.0 A Positive Voltage
Regulators
The NCP7800 series consists of 3 pin, fixed output, positive linear
voltage regulators, suitable for a wide variety of applications. These
regulators are extremely rugged, incorporating internal current
limiting, thermal shutdown and safe-area compensation. With
adequate heat sinking they can deliver output currents in excess of
1.0 A. Designed as direct replacements for the popular MC7800
family, these products offer enhanced ESD protection.
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Features
•
•
•
•
•
•
•
•
•
•
Output Current in Excess of 1.0 A
No External Components Required
Internal Thermal Overload Protection
Internal Short Circuit Current Limiting
Output Transistor Safe−Area Compensation
Output Voltage Offered in 4% Tolerance
Available in Standard 3−Lead Transistor Packages
For Tighter Tolerances and Extended Operating Range Refer to MC7800
Enhanced ESD Tolerance: HBM Exceeds 4 kV and MM Exceeds 400 V
These are Pb−Free Devices
Input
NCP78XX
Cin*
0.33 mF
1
2
3
TO−220−3
T SUFFIX
CASE 221AB
PIN CONNECTIONS
Pin 1. Input
2. Ground
3. Output
Heatsink surface
connected to Pin 2
Output
CO**
MARKING
DIAGRAM
A common ground is required between the input and
the output voltages. The input voltage must remain
typically 2.0 V above the output voltage even during the
low point on the input ripple voltage.
78xxT
AWLYWWG
XX These two digits of the type number indicate
nominal voltage.
* Cin is required if regulator is located an appreciable
distance from power supply filter.
xx
A
WL, L
Y
WW
G
= 05
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Device
ORDERING INFORMATION
** CO is not needed for stability; however,
it does improve transient response. Values of less
than 0.1 mF could cause instability.
See detailed ordering and shipping information in the package
dimensions section on page 8 of this data sheet.
Figure 1. Application Schematic
© Semiconductor Components Industries, LLC, 2009
October, 2009 − Rev. 0
1
Publication Order Number:
NCP7800/D
NCP7800
Figure 2. Simplified Block Diagram
Table 1. PIN FUNCTION DESCRIPTION
Pin No.
Pin Name
Description
1
Vin
2
GND
Power Supply Ground; Device Substrate.
3
Vout
Regulated Output Voltage.
Positive Power Supply Input.
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2
NCP7800
Table 2. ABSOLUTE MAXIMUM RATINGS (Note 1)
Rating
Input Voltage Range
Symbol
Value
Unit
Vin
−0.3 to 35
V
PD
Internally Limited
W
TJ(max)
150
°C
(for Vout: 5.0 − 15 V)
Power Dissipation
Maximum Junction Temperature
Storage Temperature Range
Tstg
−65 to +150
°C
ESD Capability,
Human Body Model (Note 2)
ESDHBM
4
kV
ESD Capability,
Machine Model (Note 2)
ESDMM
400
V
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.
1. Refer to ELECTRICAL CHARACTERISTICS and APPLICATION INFORMATION for Safe Operating Area.
2. This device series incorporates ESD protection and is tested by the following methods:
ESD Human Body Model tested per EIA/JESD22−A114
ESD Machine Model tested per EIA/JESD22−A115
Latchup Current Maximum Rating: ≤150 mA per JEDEC standard: JESD78
Table 3. THERMAL CHARACTERISTICS
Rating
Symbol
Value
RqJC
RqJA
7.5
65
Thermal Characteristics, TO220 (Note 3)
Thermal Resistance, Junction−to−Case
Thermal Resistance, Junction−to−Air (Note 4)
Unit
°C/W
3. Refer to ELECTRICAL CHARACTERISTICS and APPLICATION INFORMATION for Safe Operating Area.
4. Value based on thermal measurement in a test socket.
Table 4. OPERATING RANGES (Note 5)
Rating
Input Voltage (Note 6)
Symbol
Min
Vin
7.0
35
V
TJ
0
125
°C
(for Vout: 5.0 − 15 V)
Junction Temperature
5. Refer to ELECTRICAL CHARACTERISTICS and APPLICATION INFORMATION for Safe Operating Area.
6. Minimum Vin = 7.0 V or (Vout + VDO), whichever is higher.
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3
Max
Unit
NCP7800
Table 5. ELECTRICAL CHARACTERISTICS (Vin = 10 V, IO = 500 mA, TJ = °C to 125°C, unless otherwise noted) (Note 7)
NCP7805
Symbol
Min
Typ
Max
Unit
Output Voltage (TJ = 25°C)
VO
4.8
5.0
5.2
Vdc
Output Voltage (5.0 mA ≤ IO ≤ 1.0 A, PD ≤ 15 W)
7.0 Vdc ≤ Vin ≤ 20 Vdc
VO
4.75
5.0
5.25
−
−
1.1
0.6
100
50
−
−
1.5
2.9
50
100
−
3.0
8
−
−
0.28
0.07
1.3
0.5
Characteristic
Line Regulation (TJ = 25°C)
7.5 Vdc ≤ Vin ≤ 20 Vdc
8.0 Vdc ≤ Vin ≤ 12 Vdc
Regline
Load Regulation (TJ = 25°C)
5.0 mA ≤ IO ≤ 1.0 A
5.0 mA ≤ IO ≤ 1.5 A
Regload
Quiescent Current (TJ = 25°C)
IB
Vdc
mV
mV
mA
Quiescent Current Change
7.0 Vdc ≤ Vin ≤ 25 Vdc
5.0 mA ≤ IO ≤ 1.0 A
DIB
Ripple Rejection (Note 8)
8.0 Vdc ≤ Vin ≤ 18 Vdc, f = 120 Hz
RR
62
75
−
VI − VO
−
2.0
−
Vdc
Vn
−
6.8
−
mV/VO
Output Resistance f = 1.0 kHz (Note 8)
rO
−
0.9
−
mW
Short Circuit Current Limit (TJ = 25°C) (Note 8)
Vin = 35 Vdc
ISC
−
0.3
−
A
Peak Output Current (TJ = 25°C) (Note 8)
Imax
−
2.4
−
A
TCVO
−
0.13
−
mV/°C
Dropout Voltage (IO = 1.0 A, TJ = 25°C) (Note 8)
Output Noise Voltage (TJ = 25°C) (Note 8)
10 Hz ≤ f ≤ 100 kHz
Average Temperature Coefficient of Output Voltage (Note 8)
mA
dB
7. Performance guaranteed over the indicated operating temperature range by design and/or characterization, production tested at
TJ = TA = 25°C. Low duty cycle pulse techniques are used during testing to maintain the junction temperature as close to ambient as possible.
8. Value based on design and/or characterization.
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4
NCP7800
TYPICAL CHARACTERISTICS
80
2.5
RR, RIPPLE REJECTION (dB)
IO, OUTPUT CURRENT (A)
3.0
TJ = 0°C
2.0
TJ = 25°C
1.5
TJ = 125°C
1.0
0.5
0
0
5
10
15
20
25
35
30
60
Vin = 8.0 V to 18 V
IO = 500 mA
TA = 25°C
50
40
30
40
0.01
0.1
1
10
Vin − Vout, INPUT/OUTPUT VOLTAGE DIFFERENTIAL (V)
f, FREQUENCY (kHz)
Figure 3. Peak Output Current as a Function
of Input/Output Differential Voltage
Figure 4. Ripple Rejection as a Function of
Frequency
5.10
6
IB, QUIESCENT CURRENT (mA)
VO, OUTPUT VOLTAGE (V)
70
Vin = 20 V
IO = 5.0 mA
5.05
5.00
4.95
4.90
4.85
4.80
−60
−20
20
60
100
140
Vin = 10 V
VO = 5.0 V
IL = 20 mA
5
4
3
2
1
0
−50
180
−25
0
25
50
75
100
125
TJ, JUNCTION TEMPERATURE (°C)
TJ, JUNCTION TEMPERATURE (°C)
Figure 5. Output Voltage as a Function of
Junction Temperature (NCP7805)
Figure 6. Quiescent Current as a Function of
Temperature
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5
NCP7800
APPLICATIONS INFORMATION
Design Considerations
input bypass capacitor should be selected to provide good
high−frequency characteristics to insure stable operation
under all load conditions. A 0.33 mF or larger tantalum,
mylar, or other capacitor having low internal impedance at
high frequencies should be chosen. The bypass capacitor
should be mounted with the shortest possible leads directly
across the regulators input terminals. Normally good
construction techniques should be used to minimize ground
loops and lead resistance drops since the regulator has no
external sense lead.
The NCP7800 Series of fixed voltage regulators are
designed with Thermal Overload Protection that shuts down
the circuit when subjected to an excessive power overload
condition, Internal Short Circuit Protection that limits the
maximum current the circuit will pass, and Output Transistor
Safe−Area Compensation that reduces the output short circuit
current as the voltage across the pass transistor is increased.
In many low current applications, compensation
capacitors are not required. However, it is recommended
that the regulator input be bypassed with a capacitor if the
regulator is connected to the power supply filter with long
wire lengths, or if the output load capacitance is large. An
NCP7805
Input
0.33 mF
R
IO
Constant
Current to
Grounded
Load
Output
NCP7805
Input
0.33 mF
The NCP7800 regulators can also be used as a current source when
connected as above. In order to minimize dissipation the NCP7805 is
chosen in this application. Resistor R determines the current as follows:
0.1 mF
+
1.0 k
5.0V
I +
)I
B
O
R
10 k
MC34072V
VO = 7.0 V to 20 V
VIN ≥ VO + 2.0 V
IB ^ 3.2 mA over line and load changes.
For example, a 1.0 A current source would require R to be a 5.0 W,
10 W resistor and the output voltage compliance would be the input
voltage less 7.0 V.
The addition of an operational amplifier allows adjustment to higher or
intermediate values while retaining regulation characteristics. The
minimum voltage obtainable with this arrangement is 2.0 V greater than the
regulator voltage.
Figure 7. Current Regulator
Figure 8. Adjustable Output Regulator
RSource
MJ2955 or Equiv.
Input
Input
0.33 mF
R
RSC
RSource
NCP78XX
0.33 mF
2N6049
or Equiv.
Output
R
≥ 10 mF
1.0 mF
MJ2955
or Equiv.
1.0 mF
≥ 10 mF
NCP78XX
1.0 mF
Output
XX = 2 digits of type number indicating voltage.
XX = 2 digits of type number indicating voltage.
The NCP7800 series can be current boosted with a PNP transistor. The
MJ2955 provides current to 5.0 A. Resistor R in conjunction with the VBE
of the PNP determines when the pass transistor begins conducting; this
circuit is not short circuit proof. Input/output differential voltage minimum is
increased by VBE of the pass transistor.
The circuit of Figure 9 can be modified to provide supply protection against
short circuits by adding a short circuit sense resistor, RSC, and an
additional PNP transistor. The current sensing PNP must be able to handle
the short circuit current of the three-terminal regulator. Therefore, a
four-ampere plastic power transistor is specified.
Figure 9. Current Boost Regulator
Figure 10. Short Circuit Protection
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6
NCP7800
2.5
20
PD , POWER DISSIPATION (W)
Vin - Vout , INPUT-OUTPUT VOLTAGE
DIFFERENTIAL (V)
qHS = 0°C/W
16
qHS = 5°C/W
12
qHS = 15°C/W
8.0
4.0
0
-50
qJC = 7.5°C/W
qJA = 65°C/W
TJ(max) = 150°C
No Heatsink
-25
0
25
50
75
100
125
IO = 500 mA
IO = 200 mA
IO = 20 mA
1.5
IO = 0 mA
1.0
DVO = 2% of VO
0.5
0
-75
150
IO = 1.0 A
2.0
-50
-25
0
25
50
75
100
125
TA, AMBIENT TEMPERATURE (°C)
TJ, JUNCTION TEMPERATURE (°C)
Figure 11. Worst Case Power Dissipation vs.
Ambient Temperature (TO−220)
Figure 12. Input Output Differential as a Function
of Junction Temperature
Protection Diode
several milliseconds. In this case a damage may occur to the
regulator.
To protect the regulator the external bypass diode
connected between output and input is recommended. The
protection diode should be rated for sufficient peak current.
The NCP7800 Series has internal low impedance (about
1 W) diode path that normally does not require protection
when used in the typical regulator applications. The path
connects between output and input and it can withstand a
peak surge current of about 5 A for a reasonable time
(several milliseconds). Normal cycling of Vin cannot
generate a current surge of this magnitude for too long time
since output capacitor discharges from output to input and
follows input voltage therefore the magnitude of reverse
current is not so high. However, when Vin is shorted or
crowbarred to ground and output cap is too large and
moreover if higher voltage option is used then the peak of
reverse current is much higher than 5 A and lasts more than
Protection Diode
Input
Cin
NCP78XX
Output
Cout
Figure 13. Protection Diode Placement
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NCP7800
DEFINITIONS
Quiescent Current − That part of the input current that is
not delivered to the load.
Output Noise Voltage − The rms ac voltage at the output,
with constant load and no input ripple, measured over a
specified frequency range.
Long Term Stability − Output voltage stability under
accelerated life test conditions with the maximum rated
voltage listed in the devices’ electrical characteristics and
maximum power dissipation.
Line Regulation − The change in output voltage for a
change in the input voltage. The measurement is made under
conditions of low dissipation or by using pulse techniques
such that the average chip temperature is not significantly
affected.
Load Regulation − The change in output voltage for a
change in load current at constant chip temperature.
Maximum Power Dissipation − The maximum total
device dissipation for which the regulator will operate
within specifications.
ORDERING INFORMATION
Device
NCP7805TG
Nominal Voltage
Operating
Temperature Range
5.0 V
TJ = 0°C to +125°C
Package
Shipping†
TO 220
(Pb−Free)
50 Units / Rail
†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.
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8
NCP7800
PACKAGE DIMENSIONS
TO−220, SINGLE GAUGE
T SUFFIX
CASE 221AB−01
ISSUE O
−T−
B
F
T
SEATING
PLANE
C
S
4
DIM
A
B
C
D
F
G
H
J
K
L
N
Q
R
S
T
U
V
Z
A
Q
U
1 2 3
H
K
Z
L
R
V
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION Z DEFINES A ZONE WHERE ALL
BODY AND LEAD IRREGULARITIES ARE
ALLOWED.
J
G
D
N
INCHES
MIN
MAX
0.570
0.620
0.380
0.405
0.160
0.190
0.025
0.035
0.142
0.147
0.095
0.105
0.110
0.155
0.018
0.025
0.500
0.562
0.045
0.060
0.190
0.210
0.100
0.120
0.080
0.110
0.020
0.055
0.235
0.255
0.000
0.050
0.045
----0.080
MILLIMETERS
MIN
MAX
14.48
15.75
9.66
10.28
4.07
4.82
0.64
0.88
3.61
3.73
2.42
2.66
2.80
3.93
0.46
0.64
12.70
14.27
1.15
1.52
4.83
5.33
2.54
3.04
2.04
2.79
0.508
1.39
5.97
6.47
0.00
1.27
1.15
----2.04
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are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice
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NCP7800/D
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