KA278RA09C [FAIRCHILD]
2A Output Low Dropout Voltage Regulators; 2A输出低压差稳压器
| 型号： | KA278RA09C |
| 厂家： | 
FAIRCHILD SEMICONDUCTOR |
| 描述： | 2A Output Low Dropout Voltage Regulators |
| 文件： | 总20页 (文件大小：209K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
www.fairchildsemi.com
KA278RXXC-Series
2A Output Low Dropout Voltage Regulators
Features
Description
The KA278RXXC is a low-dropout voltage regulator suit-
able for various electronic equipments. It provides
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
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)
1
• Overcurrent protection, thermal shutdown
• Overvoltage protection, short circuit protection
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
Q1
Q1
Vin
2
1
Vin
1
Vo
2
Vo
OVERVOLTAGE
PROTECTION
OVERVOLTAGE
PROTECTION
THERMAL SHUTDOWN
BANDGAP REFERENCE
THERMAL SHUTDOWN
BANDGAP REFERENCE
-
-
+
Rin
+
R1
SOA PROTECTION
SOA PROTECTION
HIGH / LOW
OUTPUT
ON / OFF
Vdis
4
-
+
4
Vadj
R2
SHORTCIRCUIT
PROTECTION
1.4V
SHORTCIRCUIT
PROTECTION
Rref
3
3
GND
GND
(KA278RA05C)
(KA278R33/05/51/09/12C)
Rev. 1.0.2
©2005 Fairchild Semiconductor Corporation
KA278RXXC-SERIES
Absolute Maximum Ratings
KA278RXXC, KA278RA05C
Parameter
Symbol
Vin
Value
35
Unit
V
Remark
Input voltage
-
Disable voltage
KA278RXXC
Vdis
Io
35
V
-
Output current
2.0
A
-
Power dissipation 1
Power dissipation 2
Junction temperature
Operating temperature
Pd1
Pd2
Tj
1.5
W
No heatsink
15
W
With heatsink
150
°C
-
-
-
-
Topr
Rθjc
Rθja
-20 ~ 80
2.9
°C
Thermal resistance, junction-to case (note2)
Thermal resistance, junction-to-air (note2)
°C/W
°C/W
48.51
2
KA278RXXC-SERIES
Electrical Characteristics
(Vin=Note3, Io=1.0A, Ta=25°C , unless otherwise specified)
Parameter
Symbol
Conditions
Min. Typ. Max. Unit
KA278R33C
KA278R05C
KA278R51C
KA278R09C
KA278R12C
-
-
-
-
-
3.22
3.3
5
3.38
5.12
5.22
9.22
12.3
2.0
2.5
-
4.88
Output voltage
Vo
4.98
5.1
9
V
8.78
11.7
12
0.1
0.5
55
-
Load regulation
Rload
Rline
RR
5mA < Io < 2A
-
%
%
Line regulation
Note4
-
45
-
Ripple rejection ratio
Dropout voltage
Note1
dB
V
Vdrop
VdisH
VdisL
IdisH
IdisL
Iq
Io = 2A
0.5
-
Disable voltage high
Disable voltage low
KA278RXXC
KA278RXXC
Output active
Output disabled
Vdis = 2.7V
Vdis = 0.4V
Io = 0A
2.0
-
-
V
-
0.8
20
V
Disable bias current high KA278RXXC
Disable bias current low KA278RXXC
Quiescent current
-
-
µA
mA
mA
V
-
-
-0.4
10
-
-
Reference voltage
KA278RA05C
Vref
-
1.24 1.27 1.30
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
0
4.50
3.75
RL=
3.00
2.25
RL=3.3Ω
1.50
RL=
∞
0.75
0
0
5
10
Input voltage Vin(V)
15
20
0
2
4
6
8
10
Input voltage Vin (V)
Figure 2. Quiescent Current vs. Input Voltage
Figure 1. Output Voltage vs. Input Voltage
3.36
5.25
3.34
3.32
4.50
3.75
3.00
2.25
1.50
3.30
3.28
3.26
3.24
0.75
0
3.22
0
0.5
3
1
1.5
2
2.5
75
TEMPERATURE Tj(oC)
-25
0
25
50
100
125
Disable voltage Vdis (V)
Figure 3. Output Voltage vs. Disable Voltage
Figure 4. Output Voltage vs. Temperature(Tj)
10
8
0.70
0.65
0.60
0.55
0.50
6
4
2
0
2.0A
0.45
0.40
0.35
0.30
-25
0
25
50
75
100
125
75
-25
0
25
50
100
125
Junction Temp Tj [
℃]
Junction temperature Tj(oC)
Figure 5. Quiescent Current vs. Temperature(Tj)
Figure 6. Dropout Voltage vs.Junction Temperature
4
KA278RXXC-SERIES
Typical Performance Characteristics (Continued)
100
20
15
80
60
10
5
40
20
0
0
-25
3.0
0
1.0
2.0
4.0
5.0
6.0
75
TEMPERATURE Tj(oC)
0
25
50
100
125
Output Current(A)
Figure 8. Overcurrent Protection Characteristics
(Typical Value)
Figure 7. Power Dissipation vs. Temperature(Tj)
4.75
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
6
120
100
80
60
40
20
0
5
RL=
4
RL=2.5
Ω
3
2
RL=
∞
1
0
0
5
10
Input voltage Vin(V)
15
20
5
10
15
0
Input voltage Vin (V)
Figure 2. Quiescent Current vs. Input Voltage
Figure 1. Output Voltage vs. Input Voltage
7
6
5
4
3
5.06
5.04
5.02
5.00
4.98
2
1
0
4.96
4.94
4.92
0
0.5
3
1
1.5
2
2.5
75
TEMPERATURE Tj(oC)
-25
0
25
50
100
125
Disable voltage Vdis (V)
Figure 4. Output Voltage vs. Temperature(Tj)
Figure 3. Output Voltage vs. Disable Voltage
0.70
0.65
0.60
0.55
0.50
8
6
4
2
0
2.0A
0.45
0.40
0.35
0.30
-25
0
25
50
75
100
125
75
-25
0
25
50
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
15
80
60
10
5
40
20
0
0
-25
3.0
0
1.0
2.0
4.0
5.0
6.0
75
TEMPERATURE Tj(oC)
0
25
50
100
125
Output Current(A)
Figure 8. Overcurrent Protection Characteristics
(Typical Value)
Figure 7. Power Dissipation vs. Temperature(Tj)
4.75
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
7
KA278RXXC-SERIES
Typical Performance Characteristics (Continued)
KA278R51C
7
120
100
80
60
40
20
0
6
5
RL=
4
RL=2.5Ω
3
2
RL=
∞
1
0
0
5
10
Input voltage Vin(V)
15
20
5
10
15
0
Input voltage Vin (V)
Figure 2. Quiescent Current vs. Input Voltage
Figure 1. Output Voltage vs. Input Voltage
7
6
5
4
3
5.16
5.14
5.12
5.10
5.08
2
1
0
5.06
5.04
5.02
0
0.5
3
1
1.5
2
2.5
75
TEMPERATURE Tj(oC)
-25
0
25
50
100
125
Disable voltage Vdis (V)
Figure 3. Output Voltage vs. Disable Voltage
Figure 4. Output Voltage vs. Temperature(Tj)
10
8
0.70
0.65
0.60
0.55
0.50
6
4
2
0
2.0A
0.45
0.40
0.35
0.30
-25
0
25
50
75
100
125
75
-25
0
25
50
100
125
Junction Temp Tj [
℃]
Junction temperature Tj(oC)
Figure 5. Quiescent Current vs. Temperature(Tj)
Figure 6. Dropout Voltage vs. Junction Temperature
8
KA278RXXC-SERIES
Typical Performance Characteristics (Continued)
20
15
100
80
60
10
5
40
20
0
0
-25
3.0
0
1.0
2.0
4.0
5.0
6.0
TEMPERATURE Tj(oC)
Output Current(A)
Figure 8. Overcurrent Protection Characteristics
(Typical value)
Figure 7. Power Dissipation vs. Temperature(Tj)
30
25
20
15
10
5
70
60
50
0
-5
-10
-15
-20
-25
40
30
8
7
20
T
V
j
= 25 oC
IN = 7V
=1A
∆VIN = 0.5Vrms
IO
10
0
0
5
15
25
35
45
10
0.1
1
100
Time (µs)
Input Ripple Frequency (KHz)
Figure 10. Line Transient Response
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
4.75
4.50
4.25
4.00
3.75
3.50
-2.0
-2.5
2.0
0
1
2
3
4
5
6
0
20
30
40
0
10
Input-output differential voltage Vin-Vo (V)
Time (µs)
Figure 12. Output Peak Currenrt vs.
Input-Output Differential Voltage
Figure 11. Load Transient Response
9
KA278RXXC-SERIES
Typical Performance Characteristics (Continued)
KA278R09C
10
8
120
100
80
60
40
20
0
RL=
6
4
RL=4.5Ω
2
0
RL=
∞
0
5
10
Input voltage Vin(V)
15
20
10
0
5
15
20
Input voltage Vin (V)
Figure 2. Quiescent Current vs. Input Voltage
Figure 1. Output Voltage vs. Input Voltage
9.12
10
8
9.08
9.04
6
4
2
0
9.00
8.96
8.92
8.88
8.84
0
0.5
3
1
1.5
2
2.5
75
TEMPERATURE Tj(oC)
-25
0
25
50
100
125
Disable voltage Vdis (V)
Figure 3. Output Voltage vs. Disable Voltage
Figure 4. Output Voltage vs. Temperature(Tj)
10
8
0.70
0.65
0.60
0.55
0.50
6
4
2
0
2.0A
0.45
0.40
0.35
0.30
-25
0
25
50
75
100
125
75
-25
0
25
50
100
125
Junction Temp Tj [
℃
]
Junction temperature Tj(oC)
Figure 6. Dropout Voltage vs.Junction Temperature
Figure 5. Quiescent Current vs. Temperature(Tj)
10
KA278RXXC-SERIES
Typical Performance Characteristics (Continued)
20
15
100
80
60
10
5
40
20
0
0
-25
3.0
0
1.0
2.0
4.0
5.0
6.0
75
TEMPERATURE Tj(oC)
0
25
50
100
125
Output Current(A)
Figure 8. Overcurrent Protection Characteristics
(Typical Value)
Figure 7. Power Dissipation vs. Temperature(Tj)
4.75
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
120
100
80
60
40
20
0
15.0
12.5
RL=
10.0
RL= 6Ω
7.5
5.0
RL=
∞
2.5
0
0
5
10
15
20
Input voltage Vin(V)
5
10
15
20
25
0
Input voltage Vin (V)
Figure 2. Quiescent Current vs. Input Voltage
Figure 1. Output Voltage vs. Input Voltage
12.04
12.02
15.0
12.5
12.00
11.98
10.0
7.5
11.96
11.94
5.0
2.5
0
11.92
75
TEMPERATURE Tj(oC)
-25
0
25
50
100 125
0
0.5
3
1
1.5
2
2.5
Disable voltage Vdis (V)
Figure 4. Output Voltage vs. Temperature(Tj)
Figure 3. Output Voltage vs. Disable Voltage
10
8
0.70
0.65
0.60
0.55
0.50
6
4
2
0
2.0A
0.45
0.40
0.35
0.30
-25
0
25
50
75
100
125
75
-25
0
25
50
100
125
Junction Temp Tj [
℃]
Junction temperature Tj(oC)
Figure 6. Dropout Voltage vs.Junction Temperature
Figure 5. Quiescent Current vs. Temperature(Tj)
12
KA278RXXC-SERIES
Typical Performance Characteristics (Continued)
100
20
15
80
60
10
5
40
20
0
0
-25
3.0
0
1.0
2.0
4.0
5.0
6.0
75
TEMPERATURE Tj(oC)
0
25
50
100
125
Output Current(A)
Figure 8. Overcurrent Protection Characteristics
(Typical Value)
Figure 7. Power Dissipation vs. Temperature(Tj)
4.75
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
13
KA278RXXC-SERIES
Typical Performance Characteristics (Continued)
KA278RA05C
7
120
100
80
60
40
20
0
6
5
RL=
4
RL=2.5Ω
3
2
RL=
∞
1
0
0
5
10
Input voltage Vin(V)
15
20
5
10
15
0
Input voltage Vin (V)
Figure 2. Quiescent Current vs. Input Voltage
Figure 1. Output Voltage vs. Input Voltage
10
5.06
5.04
5.02
8
6
4
2
0
5.00
4.98
4.96
4.94
4.92
75
-25
0
25
50
100
125
75
TEMPERATURE Tj(oC)
-25
0
25
50
100
125
Junction temperature Tj(oC )
Figure 3. Output Voltage vs. Temperature(Tj)
* Fixed Mode (Vo=5V)
Figure 4. Quiescent Current vs. Temperature(Tj)
20
15
0.70
0.65
0.60
0.55
0.50
10
5
2.0A
0.45
0.40
0.35
0.30
-25
0
25
50
75
100
125
0
75
TEMPERATURE Tj(oC)
-25
0
25
50
100
125
Junction Temp Tj [
℃]
Figure 5. Dropout Voltage vs.Junction Temperature
Figure 6. Power Dissipation vs. Temperature(Tj)
14
KA278RXXC-SERIES
Typical Performance Characteristics (Continued)
100
4.75
4.50
4.25
4.00
3.75
3.50
80
60
40
20
0
0
1
2
3
4
5
6
3.0
0
1.0
2.0
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
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)
KA278RA05
Output
Input
Vo
2
4
Vin
1
R3
R4
KA278RA05
GND
Vadj
Ci
Co
RL
3
R
1
//R
3
4
Vo = 1.25 ( 1 +
) R
1
= 1.8kΩ , R2 = 0.6kΩ
R
2
//R
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.(C > 47µF)
O
25
20
15
10
5
0
-5
-10
50
Junction temperature Tj(ꢀ)
-50
-25
0
25
75
100 125
Figure 3. Internal Resistor(R1,R2) Variation vs. Temperature(Tj)
Output = 5V
Input
Vo
2
4
Vin
1
KA278RA05
GND
Vadj
Ci
Co
RL
3
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
(Forming)
TO-220F-4L
18
KA278RXXC-SERIES
Mechanical Dimensions (Continued)
Package
Dimensions in millimeters
(Short Lead)
TO-220F-4L
.
D
19
KA278RXXC-SERIES
Ordering Information
Product Number
KA278R33CTU
KA278R05CTU
KA278R51CTU
KA278R09CTU
KA278R12CTU
KA278RA05CTU
KA278R33CYDTU
KA278R05CYDTU
Package
Operating Temperature
TO-220F-4L
-20°C to +80°C
KA278R09CYDTU
KA278R12CYDTU
KA278RA05CYDTU
KA278R33CTSTU
KA278R05CTSTU
KA278R12CTSTU
TO-220F-4L(Forming)
(Short Lead)
TO-220F-4L
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
2/18/05 0.0m 001
Stock#DSxxxxxxxx
2005 Fairchild Semiconductor Corporation
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