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KA78RXXC-Series
1A Output Low Dropout Voltage Regulators
Features
Description
• 1A/3.3V, 5V, 8V, 9V, 12V, 15V output low dropout
voltage regulator
• TO-220 full-mold package (4pin)
• Overcurrent protection, thermal shutdown
• Overvoltage protection, short circuit protection
• With output disable function
The KA78RXXC is a low-dropout voltage regulator suitable
for various electronic equipments.
It provides constant voltage power source with TO-220-4
lead full mold package. Dropout voltage of KA78RXXC is
below 0.5V in full rated current(1A).
This regulator has various functions such as peak current
protection, thermal shut down, overvoltage protection and
output disable function.
TO-220F-4L
1
1. Vin 2. VO 3. GND 4. Vdis
Internal Block Diagram
Vin
Q1
1
THERMAL SHUTDOWN
BANDGAP REFERENCE
2
Vo
OVERVOLTAGE
PROTECTION
+
R1
SOA PROTECTION
HIGH / LOW
Vdis
4
+
OUTPUT
ON / OFF
R2
1.4V
SHORT-CIRCUIT
SHORTCIRCUIT
PROTECTION
3
GND
Rev. 1.0.1
©2011 Fairchild Semiconductor Corporation
KA78RXXC-SERIES
Absolute Maximum Ratings
KA78RXXC
Parameter
Symbol
Value
Unit
Remark
Input voltage
Vin
35
V
-
Disable voltage
Vdis
35
V
-
Output current
Io
1.0
A
-
Power dissipation 1
Pd1
1.5
W
No heatsink
Power dissipation 2
Pd2
15
W
With heatsink
Tj
+150
°C
-
Operating temperature
Topr
-20 ~ +80
°C
-
Thermal resistance, junction-to case (Note2)
Rθjc
4.31
°C/W
-
Thermal resistance, junction-to-air (Note2)
Rθja
48.83
°C/W
-
Junction temperature
2
KA78RXXC-SERIES
Electrical Characteristics
(Vin = Note3, Io = 0.5A, Ta = 25°C, unless otherwise specified)
Parameter
Output voltage
Symbol
Conditions
Min.
Typ.
Max.
KA78R33C
-
3.22
3.3
3.38
KA78R05C
-
4.88
5
5.12
-
7.8
8
8.2
-
8.78
9
9.22
KA78R12C
-
11.7
12
12.3
KA78R15C
-
14.6
15
15.4
KA78R08C
KA78R09C
Vo
Unit
V
Load regulation
Rload
5mA < Io < 1A
-
0.1
2.0
%
Line regulation
Rline
Note4
-
0.5
2.5
%
Ripple rejection ratio
RR
Note1
45
55
-
dB
Dropout voltage
Vdrop
Io = 1A
-
-
0.5
V
Disable voltage high
VdisH
Output active
2.0
-
-
V
Disable voltage low
VdisL
Output disabled
-
-
0.8
V
Disable bias current high
IdisH
Vdis = 2.7V
-
-
20
μA
Disable bias current low
IdisL
Vdis = 0.4V
-
-
-0.4
mA
Io = 0A
-
-
10
mA
Quiescent current
Iq
Note:
1.These parameters, although guaranteed, are not 100% tested in production.
2. Junction -to -case thermal resistance test environments.
-. Pneumatic heat sink fixture.
-. Clamping pressure 60psi through 12mm diameter cylinder.
-. Thermal grease applied between PKG and heat sink fixture.
3. KA78R33C : Vin = 5V
KA78R05C : Vin = 7V
KA78R08C : Vin = 10V
KA78R09C : Vin = 11V
KA78R12C : Vin = 15V
KA78R15C : Vin = 20V
4. KA78R33C : Vin = 4V to 10V
KA78R05C : Vin = 6V to 12V
KA78R08C : Vin = 9V to 25V
KA78R09C : Vin = 10V to 25V
KA78R12C : Vin = 13V to 29V
KA78R15C : Vin = 16V to 30V
3
KA78RXXC-SERIES
Typical Performance Characteristics
KA78R33
5.25
Quiescent current Iq(mA)
3.75
RL=
3.00
8
Output voltage Vo(V)
80
4.50
2.25
RL=3.3Ω
1.50
60
40
20
RL= ∞
0.75
0
0
0
2
4
6
8
0
5
10
10
15
20
Input voltage Vin(V)
Input voltage Vin (V)
Figure 2. Quiescent Current vs. Input Voltage
5.25
3.36
4.50
3.34
Output voltage Vo(V)
Output voltage Vo(V)
Figure 1. Output Voltage vs. Input Voltage
3.75
3.00
2.25
1.50
0.75
3.32
3.30
3.28
3.26
3.24
0
0
0.5
1
1.5
2
2.5
3.22
-25
3
0
Disable voltage Vdis (V)
Figure 3. Output Voltage vs. Disable Voltage
75
25
50
TEMPERATURE Tj(oC)
100
125
Figure 4. Output Voltage vs. Temperature(Tj)
0.55
8
0.50
Drop out voltage Vdrop [V]
Quescent current Iq(mA)
10
6
4
2
0
-25
0
25
50
75
100
125
o
Junction temperature Tj( C)
Figure 5. Quiescent Current vs. Temperature(Tj)
4
0.45
0.40
1.0A
0.35
0.30
0.25
0.20
-25
0
25
50
75
100
125
Junction Temp Tj [℃]
Figure 6. Dropout Voltage vs.Junction Temperature
KA78RXXC-SERIES
Typical Performance Characteristics (Continued)
100
Relative output voltage(%)
Power dissipation PD(W)
20
15
10
5
0
-25
80
60
40
20
0
0
25
50
75
100
125
TEMPERATURE TJ(oC)
Figure 7. Power Dissipation vs. Temperature(Tj)
0
0.5
1.0
1.5
2.0
2.5
3.0
Output Current(A)
Figure 8. Overcurrent Protection Characteristics
(Typical Value)
Output peak current Iop (A)
2.75
2.50
2.25
2.00
1.75
1.50
0
1
2
3
4
5
6
Input-output differential voltage Vin-Vo (V)
Figure 9. Output Peak Currenrt vs.
Input-Output Differential Voltage
5
KA78RXXC-SERIES
Typical Performance Characteristics
KA78R05C
80
Quiescent current Iq(mA)
6
5
RL=
8
Output voltage Vo(V)
7
4
3
RL=5Ω
2
1
60
40
20
RL= ∞
0
0
0
5
10
0
5
10
15
20
Input voltage Vin(V)
15
Input voltage Vin (V)
Figure 1. Output Voltage vs. Input Voltage
Figure 2. Quiescent Current vs. Input Voltage
5.06
6
Output voltage Vo(V)
Output voltage Vo(V)
7
5
4
3
2
1
0
5.04
5.02
5.00
4.98
4.96
4.94
0
0.5
1
1.5
2
2.5
4.92
-25
3
Disable voltage Vdis (V)
Figure 3. Output Voltage vs. Disable Voltage
0
75
25
50
TEMPERATURE Tj(oC )
100
125
Figure 4. Output Voltage vs. Temperature(Tj)
0.55
8
0.50
Drop out voltage Vdrop [V]
i
Quescent
current Iq(mA)
10
6
4
2
0
-25
0
25
50
75
100
125
Junction temperature Tj(oC)
Figure 5. Quiescent Current vs. Temperature(Tj)
6
0.45
0.40
1.0A
0.35
0.30
0.25
0.20
-25
0
25
50
75
100
125
Junction Temp Tj [℃]
Figure 6. Dropout Voltage vs. Junction Temperature
KA78RXXC-SERIES
Typical Performance Characteristics (Continued)
100
Relative output voltage(%)
Power dissipation P
DD(W)
20
15
10
5
0
-25
80
60
40
20
0
0
25
50
75
TEMPERATURE
100
125
TjJ(oC)
Figure 7. Power Dissipation vs. Temperature(Tj)
0
0.5
1.0
1.5
2.0
2.5
3.0
Output Current(A)
Figure 8. Overcurrent Protection Characteristics
(Typical Value)
Output peak current Iop (A)
2.75
2.50
2.25
2.00
1.75
1.50
0
1
2
3
4
5
6
Input-output differential voltage Vin-Vo (V)
Figure 9. Output Peak Currenrt vs.
Input-Output Differential Voltage
7
KA78RXXC-SERIES
Typical Performance Characteristics (Continued)
KA78R08C
80
9
RL=
8
Quiescent current Iq(mA)
8
Output voltage Vo(V)
10
7
6
5
4
RL=8Ω
3
2
1
60
40
20
RL=∞
0
0
0
5
10
15
20
0
5
25
Input voltage Vin (V)
Figure 1. Output Voltage vs. Input Voltage
10
15
20
Input voltage Vin(V)
Figure 2. Quiescent Current vs. Input Voltage
10
8.06
8
Output voltage Vo(V)
Output voltage Vo(V)
9
7
6
5
4
3
2
8.04
8.02
8.00
7.98
7.96
7.94
1
0
0.5
1
1.5
2
2.5
7.92
-25
3
0
Disable voltage Vdis (V)
Figure 3. Output Voltage vs. Disable Voltage
75
25
50
TEMPERATURE Tj(oC)
100
125
Figure 4. Output Voltage vs. Temperature(Tj)
0.55
8
0.50
Drop out voltage Vdrop [V]
Quescent current Iq(mA)
10
6
4
2
0
-25
0
25
50
75
0.45
0.40
0.30
0.25
0.20
-25
100
125
1.0A
0.35
0
25
50
75
100
125
Junction Temp Tj [℃]
Junction temperature Tj(oC )
Figure 5. Quiescent Current vs. Temperature(Tj)
8
Figure 6. Dropout Voltage vs.Junction Temperature
KA78RXXC-SERIES
Typical Performance Characteristics (Continued)
100
Relative output voltage(%)
Power dissipation PD(W)
20
15
10
5
0
-25
80
60
40
20
0
0
25
50
75
TEMPERATURE
100
125
TJ(oC)
Figure 7. Power Dissipation vs. Temperature(Tj)
0
0.5
1.0
1.5
2.0
2.5
Output Current(A)
Figure 8. Overcurrent Protection Characteristics
(Typical Value)
Output peak current Iop (A)
2.75
2.50
2.25
2.00
1.75
1.50
0
1
2
3
4
5
6
Input-output differential voltage Vin-Vo (V)
Figure 9. Output Peak Currenrt vs.
Input-Output Differential Voltage
9
KA78RXXC-SERIES
Typical Performance Characteristics (Continued)
KA78R09C
80
9
8
Quiescent current Iq(mA)
RL=
8
Output voltage Vo(V)
10
7
6
5
4
RL=9Ω
3
2
1
60
40
20
RL= ∞
0
0
0
5
10
15
20
0
5
25
10
15
20
Input voltage Vin(V)
Input voltage Vin (V)
Figure 2. Quiescent Current vs. Input Voltage
Figure 1. Output Voltage vs. Input Voltage
10
9.06
Output voltage Vo(V)
Output voltage Vo(V)
9
8
7
6
5
4
3
2
9.04
9.02
9.00
8.98
8.96
8.94
1
0
0
0.5
1
1.5
2
2.5
8.92
-25
3
0
Disable voltage Vdis (V)
Figure 3. Output Voltage vs. Disable Voltage
75
25
50
TEMPERATURE Tj(oC )
100
125
Figure 4. Output Voltage vs. Temperature(Tj)
10
0.50
8
Drop out voltage Vdrop [V]
Quescent current Iq(mA)
0.55
6
4
2
0
0.45
0.40
0.30
0.25
0.20
-25
-25
0
25
50
75
100
125
1.0A
0.35
0
25
50
75
100
125
Junction Temp Tj [℃]
Junction temperature Tj(oC)
Figure 5. Quiescent Current vs. Temperature(Tj)
10
Figure 6. Dropout Voltage vs.Junction Temperature
KA78RXXC-SERIES
Typical Performance Characteristics (Continued)
100
Relative output voltage(%)
Power dissipation PD(W)
20
15
10
5
80
60
40
20
0
0
-25
0
0
75
25
50
TEMPERATURE TJ(oC)
100
125
Figure 7. Power Dissipation vs. Temperature(Tj)
0.5
1.0
1.5
2.0
2.5
Output Current(A)
Figure 8. Overcurrent Protection Characteristics
(Typical Value)
Output peak current Iop (A)
2.75
2.50
2.25
2.00
1.75
1.50
0
1
2
3
4
5
6
Input-output differential voltage Vin-Vo (V)
Figure 9. Output Peak Currenrt vs.
Input-Output Differential Voltage
11
KA78RXXC-SERIES
Typical Performance Characteristics (Continued)
KA78R12C
80
Quiescent current Iq(mA)
15.0
12.5
RL=
8
Output voltage Vo(V)
17.5
10.0
7.5
RL=12Ω
5.0
2.5
60
40
20
RL= ∞
0
0
0
5
10
15
20
0
5
10
15
20
Input voltage Vin(V)
25
Input voltage Vin (V)
Figure 2. Quiescent Current vs. Input Voltage
17.5
12.06
15.0
12.04
Output voltage Vo(V)
Output voltage Vo(V)
Figure 1. Output Voltage vs. Input Voltage
12.5
10.0
7.5
5.0
2.5
12.02
12.00
11.98
11.96
11.94
0
0
0.5
1
1.5
2
2.5
3
11.92
-25
0
Disable voltage Vdis (V)
Figure 3. Output Voltage vs. Disable Voltage
75
25
50
TEMPERATURE Tj(oC)
100
125
Figure 4. Output Voltage vs. Temperature(Tj)
0.55
8
0.50
Drop out voltage Vdrop [V]
Quescent current Iq(mA)
10
6
4
2
0
-25
0
25
50
75
0.45
0.40
0.30
0.25
0.20
-25
100
125
1.0A
0.35
0
25
50
75
100
125
Junction Temp Tj [℃]
Junction temperature Tj(oC)
Figure 5. Quiescent Current vs. Temperature(Tj)
12
Figure 6. Dropout Voltage vs.Junction Temperature
KA78RXXC-SERIES
Typical Performance Characteristics (Continued)
100
Relative output voltage(%)
Power dissipation PD(W)
20
15
10
5
0
-25
80
60
40
20
0
0
75
25
50
TEMPERATURE TJ(oC)
100
125
Figure 7. Power Dissipation vs. Temperature(Tj)
0
0.5
1.0
1.5
2.0
2.5
3.0
Output Current(A)
Figure 8. Overcurrent Protection Characteristics
(Typical Value)
Output peak current Iop (A)
2.75
2.50
2.25
2.00
1.75
1.50
0
1
2
3
4
5
6
Input-output differential voltage Vin-Vo (V)
Figure 9. Output Peak Currenrt vs.
Input-Output Differential Voltage
13
KA78RXXC-SERIES
Typical Performance Characteristics (Continued)
KA78R15C
17.5
Quiescent current Iq(mA)
12.5
RL=
8
Output voltage Vo(V)
80
15.0
10.0
7.5
RL=15Ω
5.0
60
40
20
RL= ∞
2.5
0
0
5
0
10
15
20
0
5
25
10
15
20
Input voltage Vin(V)
Input voltage Vin (V)
Figure 2. Quiescent Current vs. Input Voltage
17.5
15.15
15.0
15.10
Output voltage Vo(V)
Output voltage Vo(V)
Figure 1. Output Voltage vs. Input Voltage
12.5
10.0
7.5
5.0
2.5
0
15.05
15.00
14.95
14.90
14.85
0
0.5
1
1.5
2
2.5
3
14.80
-25
0
Disable voltage Vdis (V)
Figure 3. Output Voltage vs. Disable Voltage
75
25
50
TEMPERATURE Tj(oC)
100
125
Figure 4. Output Voltage vs. Temperature(Tj)
10
8
0.50
Drop out voltage Vdrop [V]
Quescent current Iq(mA)
0.55
6
4
2
0
0.45
0.40
0.30
0.25
0.20
-25
-25
0
25
50
75
100
125
1.0A
0.35
0
25
50
75
100
125
Junction Temp Tj [℃]
Junction temperature Tj(oC)
Figure 5. Quiescent Current vs. Temperature(Tj)
14
Figure 6. Dropout Voltage vs.Junction Temperature
KA78RXXC-SERIES
Typical Performance Characteristics (Continued)
Relative output voltage(%)
Power dissipation PD(W)
20
15
10
5
80
60
40
20
0
0
-25
0
75
25
50
TEMPERATURE Tj(oC)
0
100
125
Figure 7. Power Dissipation vs. Temperature(Tj)
0.5
1.0
1.5
2.0
2.5
3.0
Output Current(A)
Figure 8. Overcurrent Protection Characteristics
(Typical Value)
Output peak current Iop (A)
2.75
2.50
2.25
2.00
1.75
1.50
0
1
2
3
4
5
6
Input-output differential voltage Vin-Vo (V)
Figure 9. Output Peak Currenrt vs.
Input-Output Differential Voltage
15
KA78RXXC-SERIES
Typical Application
Vo
Vin
1
2
+
+
3
GND
4
Vdis
Disable Signal
Figure 1. Application Circuit
• Ci is required if regulator is located at an appreciable distance from power supply filter.
• Co improves stability and transient response.(Co > 47μF)
16
KA78RXXC-SERIES
Mechanical Dimensions
Package
Dimensions in millimeters
TO-220F-4L
17
KA78RXXC-SERIES
Ordering Information
Product Number
Package
Operating Temperature
TO-220F-4L
-20°C to +80°C
KA78R33CTU
KA78R05CTU
KA78R08CTU
KA78R09CTU
KA78R12CTU
KA78R15CTU
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY
PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY
LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER
DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES
OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR
CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body,
or (b) support or sustain life, and (c) whose failure to
perform when properly used in accordance with
instructions for use provided in the labeling, can be
reasonably expected to result in a significant injury of the
user.
2. A critical component in any component of a life support
device or system whose failure to perform can be
reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
www.fairchildsemi.com
11/1/11 0.0m 001
Stock#DS400558
© 2011 Fairchild Semiconductor Corporation
ON Semiconductor and
are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries.
ON Semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductor’s product/patent
coverage may be accessed at www.onsemi.com/site/pdf/Patent−Marking.pdf. ON Semiconductor reserves the right to make changes without further notice to any products herein.
ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
Buyer is responsible for its products and applications using ON Semiconductor products, including compliance with all laws, regulations and safety requirements or standards,
regardless of any support or applications information provided by ON Semiconductor. “Typical” parameters which may be provided in ON Semiconductor data sheets and/or
specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer
application by customer’s technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not
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