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KA78RXXC-Series
1A Output Low Dropout Voltage Regulators
Features
* 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
Description
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
Q1 2
Vin
1
Vo
THERMAL SHUTDOWN
OVERVOLTAGE PROTECTION
BANDGAP REFERENCE
+ R1
SOA PROTECTION HIGH / LOW Vdis 4 + OUTPUT ON / OFF
R2 1.4V
SHORT-CIRCUIT SHORTCIRCUIT
PROTECTION
3 GND
Rev. 1.0.0
(c)2003 Fairchild Semiconductor Corporation
KA78RXXC-SERIES
Absolute Maximum Ratings
KA78RXXC
Parameter Input voltage Disable voltage Output current Power dissipation 1 Power dissipation 2 Junction temperature Operating temperature Thermal resistance, junction-to case (Note2) Thermal resistance, junction-to-air (Note2) Symbol Vin Vdis Io Pd1 Pd2 Tj Topr R jc R ja Value 35 35 1.0 1.5 15 +150 -20 ~ +80 4.31 48.83 Unit V V A W W C C C/W C/W Remark No heatsink With heatsink -
2
KA78RXXC-SERIES
Electrical Characteristics
(Vin = Note3, Io = 0.5A, Ta = 25 C, unless otherwise specified) Parameter KA78R33C KA78R05C Output voltage KA78R08C KA78R09C KA78R12C KA78R15C Load regulation Line regulation Ripple rejection ratio Dropout voltage Disable voltage high Disable voltage low Disable bias current high Disable bias current low Quiescent current Rload Rline RR Vdrop VdisH VdisL IdisH IdisL Iq Note4 Note1 Io = 1A Output active Output disabled Vdis = 2.7V Vdis = 0.4V Io = 0A Vo Symbol Conditions 5mA < Io < 1A Min. 3.22 4.88 7.8 8.78 11.7 14.6 45 2.0 Typ. 3.3 5 8 9 12 15 0.1 0.5 55 Max. 3.38 5.12 8.2 9.22 12.3 15.4 2.0 2.5 0.5 0.8 20 -0.4 10 % % dB V V V A mA mA V Unit
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
80
4.50 3.75 3.00 2.25 1.50 0.75
0
RL=3.3 RL=
60
40
20 RL= 0 5 10 Input voltage Vin(V) 15 20
0 0 2 4 6 8 10
Input voltage Vin (V)
Figure 1. Output Voltage vs. Input Voltage
5.25 4.50 3.75 3.00 2.25 1.50 0.75 0 0 0.5 1 1.5 2 2.5 3
Figure 2. Quiescent Current vs. Input Voltage
3.36 3.34 3.32 3.30 3.28 3.26 3.24 3.22 -25
0
Disable voltage Vdis (V)
75 25 50 TEMPERATURE Tj(oC)
100
125
Figure 3. Output Voltage vs. Disable Voltage
10
Figure 4. Output Voltage vs. Temperature(Tj)
0.55
8
0.50 0.45 0.40
6
4
0.35 0.30
1.0A
2
0.25 0.20 -25 0 25 50 75 100 125
0
-25
0
25
50
75
100
o
125
Junction temperature Tj( C)
Junction Temp Tj [ ]
Figure 5. Quiescent Current vs. Temperature(Tj)
Figure 6. Dropout Voltage vs.Junction Temperature
4
KA78RXXC-SERIES
Typical Performance Characteristics (Continued)
20
100
80
15
60
10
40
5
20
0 -25
0
0
25
50
75
100
125
0
0.5
1.0
1.5
2.0
2.5
3.0
TEMPERATURE TJ(oC)
Output Current(A)
Figure 7. Power Dissipation vs. Temperature(Tj)
Figure 8. Overcurrent Protection Characteristics (Typical Value)
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
7 6 5
RL=
80
60
4 3
RL=5
40
2 1 0 0 5 10 15
20 RL= 0 0 5 10 Input voltage Vin(V) 15 20
Input voltage Vin (V)
Figure 1. Output Voltage vs. Input Voltage
Figure 2. Quiescent Current vs. Input Voltage
7 6 5 4 3 2 1 0
5.06 5.04 5.02 5.00 4.98 4.96 4.94
0 0.5 1 1.5 2 2.5 3
4.92 -25
0
Disable voltage Vdis (V)
75 25 50 TEMPERATURE Tj(oC )
100
125
Figure 3. Output Voltage vs. Disable Voltage
Figure 4. Output Voltage vs. Temperature(Tj)
10
0.55
8
0.50 0.45 0.40
6
4
0.35 0.30
1.0A
2
0.25 0.20 -25 0 25 50 75 100 125
0
-25
0
25
50
75
100
125
Junction temperature Tj(oC)
Junction Temp Tj [ ]
Figure 5. Quiescent Current vs. Temperature(Tj)
Figure 6. Dropout Voltage vs. Junction Temperature
6
KA78RXXC-SERIES
Typical Performance Characteristics (Continued)
20
100
80
15
60
10
40
5
20
0 -25
0
0
25
50
75
100
125
0
0.5
1.0
1.5
2.0
2.5
3.0
j TEMPERATURE TJ(oC)
Output Current(A)
Figure 7. Power Dissipation vs. Temperature(Tj)
Figure 8. Overcurrent Protection Characteristics (Typical Value)
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
10 9 8 7 6 5 4 3 2 1 0 0 5 10 15 20 25
0 0 5 10 Input voltage Vin(V) 15 20
RL=8 RL=
80
60
40
20 RL=
Input voltage Vin (V) Figure 1. Output Voltage vs. Input Voltage
10 9 8 7 6 5 4 3 2 1 0 0.5 1 1.5 2 2.5 3 7.94 7.92 -25 7.98 7.96 8.04 8.02 8.00
Figure 2. Quiescent Current vs. Input Voltage
8.06
0
25
50
75
100
125
Disable voltage Vdis (V)
TEMPERATURE Tj(oC)
Figure 3. Output Voltage vs. Disable Voltage
10
Figure 4. Output Voltage vs. Temperature(Tj)
0.55
8
0.50 0.45
6
0.40 0.35 0.30 1.0A
4
2
0.25 0.20 -25 0 25 50 75 100 125
0 -25 0 25 50
75
100
125
Junction Temp Tj [ ]
Junction temperature Tj(oC )
Figure 5. Quiescent Current vs. Temperature(Tj)
Figure 6. Dropout Voltage vs.Junction Temperature
8
KA78RXXC-SERIES
Typical Performance Characteristics (Continued)
20
100
80 15 60 10
40
5
20
0 -25
0 0 25 50 75 100 125 0 0.5 1.0
1.5
2.0
2.5
TEMPERATURE TJ(oC)
Output Current(A)
Figure 7. Power Dissipation vs. Temperature(Tj)
Figure 8. Overcurrent Protection Characteristics (Typical Value)
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
10 9 8 7 6 5 4 3 2 1 0 0 5 10 15 20 25
0 0 5 10 Input voltage Vin(V) 15 20
RL=9 RL=
80
60
40
20 RL=
Input voltage Vin (V) Figure 1. Output Voltage vs. Input Voltage
10 9 8 7 6 5 4 3 2 1 0 0 0.5 1 1.5 2 2.5 3 8.94 8.92 -25 8.98 8.96 9.04 9.02 9.00
Figure 2. Quiescent Current vs. Input Voltage
9.06
0
25
50
75
100
125
Disable voltage Vdis (V)
TEMPERATURE Tj(oC )
Figure 3. Output Voltage vs. Disable Voltage
10
Figure 4. Output Voltage vs. Temperature(Tj)
0.55
8
0.50 0.45
6
0.40 0.35 0.30 1.0A
4
2
0.25 0.20 -25 0 25 50 75 100 125
0
-25
0
25
50
75
100
125
Junction Temp Tj [ ]
Junction temperature Tj(oC)
Figure 5. Quiescent Current vs. Temperature(Tj)
Figure 6. Dropout Voltage vs.Junction Temperature
10
KA78RXXC-SERIES
Typical Performance Characteristics (Continued)
20
100
80 15 60 10
40
5
20
0 0 -25 0 0 25 50 75 100 125 TEMPERATURE TJ( oC) 0.5 1.0
1.5
2.0
2.5
Output Current(A)
Figure 7. Power Dissipation vs. Temperature(Tj)
Figure 8. Overcurrent Protection Characteristics (Typical Value)
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
17.5 15.0 12.5
RL=
80
60
10.0 7.5
RL=12
40
5.0 2.5 0 0 5 10 15 20 25
20 RL= 0 0 5 10 Input voltage Vin(V) 15 20
Input voltage Vin (V)
Figure 1. Output Voltage vs. Input Voltage
17.5 15.0 12.5 10.0 7.5 5.0 2.5 0 0 0.5 1 1.5 2 2.5 3
Figure 2. Quiescent Current vs. Input Voltage
12.06 12.04 12.02 12.00 11.98 11.96 11.94 11.92 -25
0
Disable voltage Vdis (V)
75 25 50 TEMPERATURE Tj(oC)
100
125
Figure 3. Output Voltage vs. Disable Voltage
10
Figure 4. Output Voltage vs. Temperature(Tj)
0.55
8
0.50 0.45
6
0.40 0.35 0.30 1.0A
4
2
0.25 0.20 -25 0 25 50 75 100 125
0
-25
0
25
50
75
100
125
Junction Temp Tj [ ]
Junction temperature Tj(oC)
Figure 5. Quiescent Current vs. Temperature(Tj)
Figure 6. Dropout Voltage vs.Junction Temperature
12
KA78RXXC-SERIES
Typical Performance Characteristics (Continued)
20
100
80
15
60
10
40
5
20
0 -25
0
0
75 25 50 TEMPERATURE TJ(oC)
100
125
0
0.5
1.0
1.5
2.0
2.5
3.0
Output Current(A)
Figure 7. Power Dissipation vs. Temperature(Tj)
Figure 8. Overcurrent Protection Characteristics (Typical Value)
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
80
15.0 12.5
RL=
60
10.0
40
7.5 5.0 2.5
0
RL=15
20 RL= 0 5 10 Input voltage Vin(V) 15 20
0 0 5 10 15 20 25
Input voltage Vin (V)
Figure 1. Output Voltage vs. Input Voltage
17.5 15.0 12.5 10.0 7.5 5.0 2.5 0
Figure 2. Quiescent Current vs. Input Voltage
15.15 15.10 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)
75 25 50 TEMPERATURE Tj(oC)
100
125
Figure 3. Output Voltage vs. Disable Voltage
10
Figure 4. Output Voltage vs. Temperature(Tj)
0.55
8
0.50 0.45
6
0.40 0.35 0.30 1.0A
4
2
0.25 0.20 -25 0 25 50 75 100 125
0
-25
0
25
50
75
100
125
Junction Temp Tj [ ]
Junction temperature Tj( oC)
Figure 5. Quiescent Current vs. Temperature(Tj)
Figure 6. Dropout Voltage vs.Junction Temperature
14
KA78RXXC-SERIES
Typical Performance Characteristics (Continued)
20 80 15 60 10
40
5
20
0 0 -25 0 75 25 50 TEMPERATURE Tj(oC) 0 100 125 0.5 1.0
1.5
2.0
2.5
3.0
Output Current(A) Figure 8. Overcurrent Protection Characteristics (Typical Value)
Figure 7. Power Dissipation vs. Temperature(Tj)
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
Vin 1 2
Vo
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 > 47 F)
16
KA78RXXC-SERIES
Mechanical Dimensions
Package Dimensions in millimeters
TO-220F-4L
17
KA78RXXC-SERIES
Mechanical Dimensions (Continued)
Package Dimensions in millimeters
TO-220F-4L(Forming)
18
KA78RXXC-SERIES
Mechanical Dimensions (Continued)
Package Dimensions in millimeters
TO-220F-4L(Short Lead)
19
KA78RXXC-SERIES
Ordering Information
Product Number KA78R33CTU KA78R05CTU KA78R08CTU KA78R09CTU KA78R12CTU KA78R15CTU KA78R33CYDTU KA78R05CYDTU KA78R09CYDTU KA78R33CTSTU KA78R05CTSTU KA78R08CTSTU KA78R09CTSTU KA78R12CTSTU TO-220F-4L(Short Lead) TO-220F-4L(Forming) -20 C to +80 C TO-220F-4L Package Operating Temperature
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.
www.fairchildsemi.com 8/26/03 0.0m 001 Stock#DSxxxxxxxx 2003 Fairchild Semiconductor Corporation
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.

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