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KA278RXXC-Series
2A Output Low Dropout Voltage Regulators
Features
KA278RXXC-series (33/05/51/09/12)
* 2A/3.3V, 5V, 5.1V, 9V, 12V 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 KA278RXXC 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. The dropout voltage of KA278RXXC is below 0.5V in full rated current(2A). This regulator has various functions such as a peak current protection, a thermal shut down, an overvoltage protection .
TO-220F-4L
KA278RA05C
* * * * * * Nominal 5V output without adjusting Output adjustable between 1.25V and 32V 2A output low dropout voltage regulator TO-220 full-mold package (4pin) Overcurrent protection, thermal shutdown Overvoltage protection, short circuit protection
1
1.Vin 2. Vo 3. GND 4. Vdis - KA278RXXC(33/05/51/09/12) 1.Vin 2. Vo 3. GND 4. Vadj - KA278RA05C
Internal Block Diagram
Vin
1
Q1
2
Vo
Vin
1
Q1
2 Vo
THERMAL SHUTDOWN
OVERVOLTAGE PROTECTION
THERMAL SHUTDOWN
OVERVOLTAGE PROTECTION
BANDGAP REFERENCE
+ R1
BANDGAP REFERENCE
+ Rin
SOA PROTECTION HIGH / LOW Vdis 4 + OUTPUT ON / OFF
SOA PROTECTION
4
R2 SHORTCIRCUIT PROTECTION
Vadj
1.4V
SHORTCIRCUIT PROTECTION
Rref
3 GND
3 GND
(KA278R33/05/51/09/12C)
(KA278RA05C)
Rev. 1.0.2
(c)2005 Fairchild Semiconductor Corporation
KA278RXXC-SERIES
Absolute Maximum Ratings
KA278RXXC, KA278RA05C
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) KA278RXXC Symbol Vin Vdis Io Pd1 Pd2 Tj Topr Rjc Rja Value 35 35 2.0 1.5 15 150 -20 ~ 80 2.9 48.51 Unit V V A W W C C C/W C/W Remark No heatsink With heatsink -
2
KA278RXXC-SERIES
Electrical Characteristics
(Vin=Note3, Io=1.0A, Ta=25C , unless otherwise specified) Parameter KA278R33C KA278R05C Output voltage KA278R51C KA278R09C KA278R12C Load regulation Line regulation Ripple rejection ratio Dropout voltage Disable voltage high Disable voltage low Disable bias current low Quiescent current Reference voltage KA278RA05C KA278RXXC KA278RXXC KA278RXXC Rload Rline RR Vdrop VdisH VdisL IdisH IdisL Iq Vref Note4 Note1 Io = 2A Output active Output disabled Vdis = 2.7V Vdis = 0.4V Io = 0A Vo Symbol Conditions 5mA < Io < 2A Min. 3.22 4.88 4.98 8.78 11.7 45 2.0 1.24 Typ. 3.3 5 5.1 9 12 0.1 0.5 55 1.27 Max. 3.38 5.12 5.22 9.22 12.3 2.0 2.5 0.5 0.8 20 -0.4 10 1.30 % % dB V V V A mA mA V V Unit
Disable bias current high KA278RXXC
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. KA278R33C : Vin = 5V KA278R05C : Vin = 7V KA278R09C : Vin = 11V KA278R12C : Vin = 15V 4. KA278R33C : Vin =4 to 10V KA278R05C, KA278R51C : Vin=6 to 12V KA278R09C : Vin=10 to 25V KA278R12C : Vin = 13V to 29V
3
KA278RXXC-SERIES
Typical Performance Characteristics
KA278R33C
5.25
100 80 60 40 20
RL=
Output voltage Vo(V)
4.50 3.75 3.00 2.25 1.50 0.75
0
RL=3.3 RL= 8
Quiescent current Iq(mA)
0 0 2 4 6 8 10
0
5
10 Input voltage Vin(V)
15
20
Input voltage Vin (V)
Figure 1. Output Voltage vs. Input Voltage
5.25
Figure 2. Quiescent Current vs. Input Voltage
3.36
Output voltage Vo(V)
0 0.5 1 1.5 2 2.5 3
Output voltage Vo(V)
4.50 3.75 3.00 2.25 1.50 0.75 0
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)
Quiescent current Iq(mA)
0.70
8
Drop out voltage Vdrop [V]
0.65 0.60 0.55 0.50 0.45 0.40 0.35 0.30 -25 0 25 50 75 100 125 2.0A
6
4
2
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
4
KA278RXXC-SERIES
Typical Performance Characteristics (Continued)
20
100
Relative output voltage(%)
Power dissipation PD(W)
80 60
15
10
40
5
20
0 -25
0
0
75 25 50 TEMPERATURE Tj(oC)
100
125
0
1.0
2.0
3.0
4.0
5.0
6.0
Output Current(A)
Figure 7. Power Dissipation vs. Temperature(Tj)
Figure 8. Overcurrent Protection Characteristics (Typical Value)
4.75 Output peak current Iop (A) 4.50 4.25 4.00 3.75 3.50
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
KA278RXXC-SERIES
Typical Performance Characteristics(Continued)
KA278R05C
7
120
Output voltage Vo(V)
6
100
5
RL=
Quiescent current Iq(mA)
80 60 40 20 RL= 0 0 5 10 Input voltage Vin(V) 15 20
4
RL=2.5
3 2 1 0 0 5 10 15
8
Input voltage Vin (V)
Figure 1. Output Voltage vs. Input Voltage
7
Figure 2. Quiescent Current vs. Input Voltage
5.06
Output voltage Vo(V)
6 5 4 3 2 1 0
Output voltage Vo(V)
0 0.5 1 1.5 2 2.5 3
5.04 5.02 5.00 4.98 4.96 4.94 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)
Quiescent current Iq(mA)
0.70
8
Drop out voltage Vdrop [V]
0.65 0.60 0.55 0.50 0.45 0.40 0.35 0.30 -25 0 25 50 75 100 125 2.0A
6
4
2
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
6
KA278RXXC-SERIES
Typical Performance Characteristics (Continued)
20
Relative output voltage(%)
Power dissipation PD(W)
80 60
15
10
40
5
20
0 -25
0
0 75 25 50 TEMPERATURE Tj(oC) 100 125
0
1.0
2.0
3.0
4.0
5.0
6.0
Output Current(A)
Figure 7. Power Dissipation vs. Temperature(Tj)
4.75 Output peak current Iop (A) 4.50 4.25 4.00 3.75 3.50
Figure 8. Overcurrent Protection Characteristics (Typical Value)
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
KA278RXXC-SERIES
Typical Performance Characteristics (Continued)
KA278R51C
7
120
Output voltage Vo(V)
6
100
5
RL= 8
Quiescent current Iq(mA)
80 60 40 20 RL= 0 0 5 10 Input voltage Vin(V) 15 20
4 3 2 1 0 0 5
RL=2.5
10
15
Input voltage Vin (V)
Figure 1. Output Voltage vs. Input Voltage
7
Figure 2. Quiescent Current vs. Input Voltage
5.16
Output voltage Vo(V)
5 4 3 2 1 0
Output voltage Vo(V)
0 0.5 1 1.5 2 2.5 3
6
5.14 5.12 5.10 5.08 5.06 5.04 5.02 -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)
0.70
Quescent current Iq(mA)
8
Drop out voltage Vdrop [V]
0.65 0.60 0.55 0.50 0.45 0.40 0.35 0.30 -25 0 25 50 75 100 125 2.0A
6
4
2
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
8
KA278RXXC-SERIES
Typical Performance Characteristics (Continued)
20 100
Relative output voltage(%)
Power dissipation PD(W)
80 60
15
10
40
5
20
0 -25 TEMPERATURE Tj(oC)
0 0 1.0 2.0
3.0
4.0
5.0
6.0
Output Current(A)
Figure 7. Power Dissipation vs. Temperature(Tj)
70
Figure 8. Overcurrent Protection Characteristics (Typical value)
30 25 20 15 10 5 0 -5 -10 -15 -20 -25 8
Ripple Rejection RR (dB)
60 50 40 30 20 10 0 Tj = 25 oC VIN = 7V IO =1A VIN = 0.5Vrms 0.1 1 10 100
Input Voltage (V)
Output Voltage Deviation (mV)
7
0
5
15
25
35
45
Input Ripple Frequency (KHz)
Time (s)
Figure 9. Ripple Rejection vs. Input Ripple Frequency
3.0 2.5 2.0 1.5 1.0 0.5 0.0 -0.5 -1.0 -1.5 -2.0 -2.5 2.0
Figure 10. Line Transient Response
Output Voltage Deviation (V)
4.75 Output peak current Iop (A) 4.50 4.25 4.00 3.75 3.50
Output Current (A)
0
0
1
2
3
4
5
6
0
10
20
30
40
Input-output differential voltage Vin-Vo (V)
Time (s)
Figure 11. Load Transient Response
Figure 12. Output Peak Currenrt vs. Input-Output Differential Voltage
9
KA278RXXC-SERIES
Typical Performance Characteristics (Continued)
KA278R09C
10
120
Output voltage Vo(V)
8
RL=
100 Quiescent current Iq(mA)
8
6
80 60 40 20 RL= 0 0 5 10 Input voltage Vin(V) 15 20
4
RL=4.5
2
0
0
5
10
15
20
Input voltage Vin (V)
Figure 1. Output Voltage vs. Input Voltage
10 8
Figure 2. Quiescent Current vs. Input Voltage
9.12
Output voltage Vo(V)
0 0.5 1 1.5 2 2.5 3
Output voltage Vo(V)
9.08 9.04 9.00 8.96 8.92 8.88
6
4
2
0
8.84 -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)
Quescent current Iq(mA)
0.70
8
Drop out voltage Vdrop [V]
0.65 0.60 0.55 0.50 0.45 0.40 0.35 0.30 -25 0 25 50 75 100 125 2.0A
6
4
2
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
KA278RXXC-SERIES
Typical Performance Characteristics (Continued)
20
100
Power dissipation PD(W)
Relative output voltage(%)
80 60
15
10
40
5
20
0 -25
0
0
75 25 50 TEMPERATURE Tj(oC)
100
125
0
1.0
2.0
3.0
4.0
5.0
6.0
Output Current(A)
Figure 7. Power Dissipation vs. Temperature(Tj)
Figure 8. Overcurrent Protection Characteristics (Typical Value)
4.75 Output peak current Iop (A) 4.50 4.25 4.00 3.75 3.50 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
KA278RXXC-SERIES
Typical Performance Characteristics (Continued)
KA278R12C
Output voltage Vo(V)
15.0
Quiescent current Iq(mA)
120 100
RL= 8
12.5 10.0
RL= 6
80 60 40 20 RL= 0 0 5 10 Input voltage Vin(V) 15 20
7.5 5.0 2.5 0 0 5 10 15 20 25
Input voltage Vin (V)
Figure 1. Output Voltage vs. Input Voltage Figure 2. Quiescent Current vs. Input Voltage
Output voltage Vo(V)
Output voltage Vo(V)
15.0 12.5 10.0 7.5 5.0 2.5 0 0 0.5 1 1.5 2 2.5 3
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)
0.70
Quiescent current Iq(mA)
8
Drop out voltage Vdrop [V]
0.65 0.60 0.55 0.50 0.45 0.40 0.35 0.30 -25 0 25 50 75 100 125 2.0A
6
4
2
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
12
KA278RXXC-SERIES
Typical Performance Characteristics (Continued)
20
100
Power dissipation PD(W)
Relative output voltage(%)
80 60
15
10
40
5
20
0 -25
0
0
25 50 TEMPERATURE Tj(oC)
75
0
1.0
2.0
3.0
100
125
4.0
5.0
6.0
Output Current(A)
Figure 7. Power Dissipation vs. Temperature(Tj)
Figure 8. Overcurrent Protection Characteristics (Typical Value)
4.75 4.75 Output peak current Iop (A) Output peak current Iop (A) 4.50 4.50 4.25 4.25 4.00 4.00 3.75 3.75 3.50 3.50 0 0
1 1
2 2
3 3
4 4
5 5
6 6
Input-output differential voltage Vin-Vo (V) Input-output differential voltage Vin-Vo (V)
Figure 9. Output Peak Currenrt vs. Input-Output Differential Voltage
13
KA278RXXC-SERIES
Typical Performance Characteristics (Continued)
KA278RA05C
7
120
Output voltage Vo(V)
6
100
5
RL=
Quiescent current Iq(mA)
80 60 40 20 RL= 0 0 5 10 Input voltage Vin(V) 15 20
4 3 2 1 0 0 5
8
RL=2.5
10
15
Input voltage Vin (V)
Figure 1. Output Voltage vs. Input Voltage
5.06
Figure 2. Quiescent Current vs. Input Voltage
10
Output voltage Vo(V)
5.04 5.02 5.00 4.98 4.96 4.94 4.92 -25
Quiescent current Iq(mA)
8
6
4
2
0 0 75 25 50 TEMPERATURE Tj(oC) 100 125
-25
0
25
50
75
100
125
Junction temperature
Tj(oC
)
Figure 3. Output Voltage vs. Temperature(Tj) * Fixed Mode (Vo=5V)
0.70 0.65 Drop out voltage Vdrop [V] 0.60 0.55 0.50 0.45 0.40 0.35 0.30 -25 0 25 50 75 100 125 2.0A
Figure 4. Quiescent Current vs. Temperature(Tj)
20
Power dissipation PD(W)
15
10
5
Junction Temp Tj []
0 -25
0
75 25 50 TEMPERATURE Tj(oC)
100
125
Figure 5. Dropout Voltage vs.Junction Temperature
Figure 6. Power Dissipation vs. Temperature(Tj)
14
KA278RXXC-SERIES
Typical Performance Characteristics (Continued)
100
4.75 Output peak current Iop (A) 4.50 4.25 4.00 3.75 3.50
Relative output voltage(%)
80 60
40
20
0 0 1.0 2.0
0
1
2
3
4
5
6
3.0
4.0
5.0
6.0
Input-output differential voltage Vin-Vo (V)
Output Current(A)
Figure 7. Overcurrent Protection Characteristics(Typical value)
Figure 8. Output Peak Currenrt vs. Input-Output Differential Voltage
15
KA278RXXC-SERIES
Typical Application
KA278R33/05/51/09/12C
Vin 1
+
Vo 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 > 47F)
KA278RA05
Input
1 Vin
Vo 2
Output
KA278RA05
Ci
GND
R3 Co R4 RL
3
Vadj 4
Vo = 1.25 ( 1 +
R1//R3 ) R1 = 1.8k , R2 = 0.6k R2//R4
Figure 2. Application Circuit (Adjustable Mode)
* Ci is required if regulator is located at an appreciable distance from power supply filter. * Co improves stability and transient response.(CO > 47F)
25 20
Variation(%)
15 10 5
0 -5 -10 -50 -25 0 25 50 75 100 125
Junction temperature Tj()
Figure 3. Internal Resistor(R1,R2) Variation vs. Temperature(Tj)
Input
1 Vin
Vo
Output = 5V
2
KA278RA05
Ci
GND Vadj
3
4
Co
RL
Figure 4. Application Circuit (Fixed Mode)
16
KA278RXXC-SERIES
Mechanical Dimensions
Package Dimensions in millimeters
TO-220F-4L
17
KA278RXXC-SERIES
Mechanical Dimensions (Continued)
Package Dimensions in millimeters
TO-220F-4L(Forming)
18
KA278RXXC-SERIES
Mechanical Dimensions (Continued)
Package Dimensions in millimeters
TO-220F-4L(Short Lead)
NOTE
1. THESE DIMENSIONS DO NOT INCLUDE MOLD PROTRUSION. 2. ( ) IS REFERENCE 3. [ ] IS ASS'Y OUT QUALITY
TITLE
UNIT
PKG OUTLINE TO-220F-4L , SHORT LEAD
TOLERANCE mm N/A SPEC NO. SCALE 5:1
D
DWG. NO.
19
KA278RXXC-SERIES
Ordering Information
Product Number KA278R33CTU KA278R05CTU KA278R51CTU KA278R09CTU KA278R12CTU KA278RA05CTU KA278R33CYDTU KA278R05CYDTU KA278R09CYDTU KA278R12CYDTU KA278RA05CYDTU KA278R33CTSTU KA278R05CTSTU KA278R12CTSTU TO-220F-4L(Short Lead) TO-220F-4L(Forming) -20C to +80C 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 2/18/05 0.0m 001 Stock#DSxxxxxxxx 2005 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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