KA278RA05CTU [ONSEMI]
2A 可调节/固定 5V 低漏电压稳压器 (LDO);
| 型号： | KA278RA05CTU |
| 厂家： | 
ONSEMI |
| 描述： | 2A 可调节/固定 5V 低漏电压稳压器 (LDO) 局域网 PC 输出元件 稳压器 调节器 |
| 文件： | 总18页 (文件大小：340K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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July 2013
KA278RXXC-Series
2 A Output Low Dropout Voltage Regulators
Description
Features
The KA278RXXC is a low-dropout voltage regulator suit-
able for various electronic equipment. It provides a con-
stant voltage power source in a TO-220 4-lead full-mold
package. The dropout voltage is below 0.5 V in full-rated
current (2 A). This regulator has peak current protection,
thermal shutdown, and over-voltage protection.
KA278RXXC-Series (33 / 05 / 12)
• 3.3 V, 5 V, 12 V Output Low-Dropout Voltage Regulator
• TO-220 Full-Mold Package (4 Pin)
• Over-Current Protection, Thermal Shutdown
• Over-Voltage Protection, Short-Circuit Protection
• Output Disable Function
KA278RA05C
TO-220F 4L
• Nominal 5 V Output without Adjusting
• Output Adjustable between 1.27 V and 32 V
• 2 A Output Low-Dropout Voltage Regulator
• TO-220 Full-Mold Package (4 Pin)
• Over-Current Protection, Thermal Shutdown
• Over-Voltage Protection, Short-Circuit Protection
1
1. VIN 2. VO 3. GND 4. Vdis - KA278RXXC (33 / 05 / 12)
1.VIN 2. VO 3. GND 4. Vadj - KA278RA05C
Ordering Information
Operating
Part Number
Temperature
Range
Top Mark
Package
Packing Method
KA278R33CTU
KA278R05CTU
KA278R12CTU
KA278RA05CTU
KA278R12CYDTU
278R33
278R05
278R12
278RA05
278R12
TO-220F 4L
-20 to 80°C
Rail
TO-220F 4L (Forming)
© 2004 Fairchild Semiconductor Corporation
KA278RXXC-Series Rev. 1.1.0
www.fairchildsemi.com
1
Block Diagram
Q1
Q1
2
Vin
Vin
1
Vo
1
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
SHORTCIRCUIT
PROTECTION
1.4V
Rref
3
3
GND
GND
Figure 1. KA278R33 / 05 / 12C
Figure 2. KA278RA05C
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be opera-
ble above the recommended operating conditions and stressing the parts to these levels is not recommended. In addi-
tion, extended exposure to stresses above the recommended operating conditions may affect device reliability. The
absolute maximum ratings are stress ratings only. Values are at TA = 25°C unless otherwise noted.
Symbol
VIN
Parameter
Value
35
Unit
V
Input Voltage
Vdis
IO
Disable Voltage
KA278RXXC
35
V
Output Current
2.0
A
PD1
PD2
Tj
Power Dissipation 1
Power Dissipation 2
Junction Temperature
Operating Temperature
No Heat-Sink
1.5
W
With Heat-Sink
15
W
150
°C
Topr
Rθjc
Rθja
-20 to 80
2.9
°C
Thermal Resistance, Junction-to Case(1)
°C/W
°C/W
Thermal Resistance, Junction-to-Air
48.51
Note:
1. Junction-to-case thermal resistance test environments:
- Pneumatic heat sink fixture;
- Clamping pressure 60 psi through 12 mm diameter cylinder;
- Thermal grease applied between PKG and heat sink fixture.
© 2004 Fairchild Semiconductor Corporation
www.fairchildsemi.com
KA278RXXC-Series Rev. 1.1.0
2
Electrical Characteristics
VIN = Note 3, IO = 1.0 A, TA = 25°C, unless otherwise specified.
Symbol
Parameter
Test Conditions Min.
Typ. Max.
Unit
KA278R33C
KA278R05C
KA278R12C
3.22
3.30
5.00
12.00
0.1
3.38
5.12
12.30
2.0
VO
Output Voltage
Load Regulation
Line Regulation(4)
Ripple Rejection Ratio(2)
4.88
11.70
V
Rload
Rline
RR
5 mA < IO < 2 A
%
%
0.5
2.5
45
55
dB
V
Vdrop
VdisH
VdisL
IdisH
IdisL
Iq
Dropout Voltage
IO = 2 A
0.5
Disable Voltage High
Disable Voltage Low
KA278RXXC
KA278RXXC
Output Active
Output Disabled
Vdis = 2.7 V
Vdis = 0.4 V
IO = 0 A
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
Vref
Reference Voltage
KA278RA05C
1.24
1.27
1.30
Notes:
2. These parameters, although guaranteed, are not 100% tested in production.
3. KA278R33C: VIN = 5 V;
KA278R05C: VIN = 7 V;
KA278R12C: VIN = 15 V.
4. KA278R33C: VIN =4 V to 10 V;
KA278R05C: VIN = 6 V to 12 V;
KA278R12C: VIN = 13 V to 29 V.
© 2004 Fairchild Semiconductor Corporation
www.fairchildsemi.com
KA278RXXC-Series Rev. 1.1.0
3
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 4. Quiescent Current vs. Input Voltage
Figure 3. Output Voltage vs. Input Voltage
5.25
3.36
4.50
3.75
3.34
3.32
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 5. Output Voltage vs. Disable Voltage
Figure 6. 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 8. Dropout Voltage vs. Junction Temperature
Figure 7. Quiescent Current vs. Temperature (Tj)
© 2004 Fairchild Semiconductor Corporation
KA278RXXC-Series Rev. 1.1.0
www.fairchildsemi.com
4
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 10. Over-Current Protection Characteristics
(Typical Value)
Figure 9. 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 11. Output Peak Current vs. Input-Output
Differential Voltage
© 2004 Fairchild Semiconductor Corporation
KA278RXXC-Series Rev. 1.1.0
www.fairchildsemi.com
5
Typical Performance Characteristics (KA278R05C)
7
6
120
100
80
60
40
20
0
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 13. Quiescent Current vs. Input Voltage
Figure 12. 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 14. Output Voltage vs. Disable Voltage
Figure 15. Output Voltage vs. Temperature (Tj)
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 17. Dropout Voltage vs. Junction Temperature
figure 16. Quiescent Current vs. Temperature (Tj)
© 2004 Fairchild Semiconductor Corporation
KA278RXXC-Series Rev. 1.1.0
www.fairchildsemi.com
6
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 19. Over-Current Protection Characteristics
(Typical Value)
Figure 18. 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 20. Output Peak Current vs. Input-Output
Differential Voltage
© 2004 Fairchild Semiconductor Corporation
KA278RXXC-Series Rev. 1.1.0
www.fairchildsemi.com
7
Typical Performance Characteristics (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
5
10
15
20
25
Input voltage Vin(V)
0
Input voltage Vin (V)
Figure 22. Quiescent Current vs. Input Voltage
Figure 21. Output Voltage vs. Input Voltage
15.0
12.5
12.04
12.02
10.0
7.5
12.00
11.98
5.0
11.96
11.94
2.5
0
11.92
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 23. Output Voltage vs. Disable Voltage
Figure 24. 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 26. Dropout Voltage vs. Junction Temperature
25. Quiescent Current vs. Temperature (Tj)
© 2004 Fairchild Semiconductor Corporation
KA278RXXC-Series Rev. 1.1.0
www.fairchildsemi.com
8
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 28. Over-Current Protection Characteristics
(Typical Value)
Figure 27. 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 29. Output Peak Current vs. Input-Output
Differential Voltage
© 2004 Fairchild Semiconductor Corporation
KA278RXXC-Series Rev. 1.1.0
www.fairchildsemi.com
9
Typical Performance Characteristics (KA278RA05C)
7
120
6
5
100
80
60
40
20
0
RL=
4
3
2
RL=2.5Ω
RL=
∞
1
0
0
5
10
Input voltage Vin(V)
15
20
5
10
15
0
Input voltage Vin (V)
Figure 31.Quiescent Current vs. Input Voltage
Figure 30. Output Voltage vs. Input Voltage
5.06
10
8
5.04
5.02
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 32. Output Voltage vs. Temperature (Tj)
*Fixed Mode (VO = 5 V)
Figure 33. 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 35. Power Dissipation vs. Temperature (Tj)
Figure 34. Dropout Voltage vs. Junction
Temperature
© 2004 Fairchild Semiconductor Corporation
KA278RXXC-Series Rev. 1.1.0
www.fairchildsemi.com
10
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 37. Output Peak Current vs. Input-Output
Differential Voltage
Figure 36. Over-Current Protection Characteristics
(Typical Value)
© 2004 Fairchild Semiconductor Corporation
KA278RXXC-Series Rev. 1.1.0
www.fairchildsemi.com
11
Typical Application
KA278R33 / 05 / 12C
Vo
Vin
1
2
3
GND
4
Vdis
Disable Signal
Figure 38. 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 μF).
© 2004 Fairchild Semiconductor Corporation
www.fairchildsemi.com
KA278RXXC-Series Rev. 1.1.0
12
Typical Application (continued)
KA278RA05
Output
Input
Vo
2
4
Vin
1
R3
R4
KA278RA05
GND
Vadj
Ci
Co
RL
3
R1//R3
R = 1.8 kΩ, R = 0.6 kΩ
) 1
Vo = ( 1 +
1.27
2
R2//R4
Figure 39. 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 > 47 μF).
25
20
15
10
5
0
-5
-10
50
Junction temperature Tj(℃)
-50
-25
0
25
75
100 125
Figure 40. Internal Resistor (R1, R2) Variation vs. Temperature (Tj)
Output = 5V
Input
Vo
2
4
Vin
1
KA278RA05
GND
Vadj
Ci
Co
RL
3
Figure 41. Application Circuit (Fixed Mode)
© 2004 Fairchild Semiconductor Corporation
KA278RXXC-Series Rev. 1.1.0
www.fairchildsemi.com
13
Physical Dimensions
TO-220F 4L
10.20
9.80
7.00
3.00
2.60
3.40
3.00
5.00
3.50
3.30
6.70
6.30
1.00X45°
15.90
15.50
B
15.80
15.40
1.30 MAX (3X)
1.05 MIN (3X)
0.89
13.60
10.60
1
4
10.00
0.70
(4X)
0.50
1.70
1.30
B
B
1.25 MIN
0.60
0.45
1.50 MAX
2.79
(4X)
2.29
NOTES:
A. EXCEPT WHERE NOTED CONFORMS TO
SC91A.
B
DOES NOT COMPLY EIAJ STD. VALUE.
C. ALL DIMENSIONS ARE IN MILLIMETERS.
D. DIMENSIONS ARE EXCLUSIVE OF BURRS,
MOLD FLASH AND TIE BAR PROTRUSIONS.
E. PIN 2 CONNECTS TO DAP.
4.70
4.30
F. DRAWING FILE NAME: TO220C04REV1
Figure 42. TO220, MOLDED, 4-LEAD, FULL-PACK, STARIGHT LEAD (ACTIVE)
Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner
without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or
obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the
warranty therein, which covers Fairchild products.
Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings:
http://www.fairchildsemi.com/dwg/TO/TO220C04.pdf.
For current tape and reel specifications, visit Fairchild Semiconductor’s online packaging area:
http://www.fairchildsemi.com/packing_dwg/PKG-TO220C04.pdf.
© 2004 Fairchild Semiconductor Corporation
KA278RXXC-Series Rev. 1.1.0
www.fairchildsemi.com
14
Physical Dimensions (continued)
TO-220F 4L (Forming)
10.20
9.80
3.00
2.60
3.40
3.00
3.50
3.30
7.00
5.00
6.70
6.30
1.00X45°
15.90
15.50
B
15.80
15.40
26.80
25.20
1.30 MAX (3X) 5.60
5.00
1.05 MIN (3X)
B
B
1.70
1.30
5.30
0.70
B
0.89
4.70
0.50
4
1
2.79
2.29
0.60
0.45
B
1.25 MIN
1.50 MAX
3.48
2.88
B
NOTES:
A. EXCEPT WHERE NOTED CONFORMS TO
SC91A.
B
DOES NOT COMPLY EIAJ STD. VALUE.
C. ALL DIMENSIONS ARE IN MILLIMETERS.
D. DIMENSIONS ARE EXCLUSIVE OF BURRS,
MOLD FLASH AND TIE BAR PROTRUSIONS.
E. PIN 2 CONNECTS TO DAP.
4.70
4.30
F. DRAWING FILE NAME: TO220B04REV1
Figure 43. TO220, MOLDED, 4-LEAD, FULL-PACK, YDTU FORMING (ACTIVE)
Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner
without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or
obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the
warranty therein, which covers Fairchild products.
Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings:
http://www.fairchildsemi.com/dwg/TO/TO220B04.pdf.
For current tape and reel specifications, visit Fairchild Semiconductor’s online packaging area:
http://www.fairchildsemi.com/packing_dwg/PKG-TO220B04.pdf.
© 2004 Fairchild Semiconductor Corporation
KA278RXXC-Series Rev. 1.1.0
www.fairchildsemi.com
15
TRADEMARKS
The following includes registered and unregistered trademarks and service marks, owned by Fairchild Semiconductor and/or its global subsidiaries, and is not
intended to be an exhaustive list of all such trademarks.
Sync-Lock™
2Cool¥
FPS¥
®
AccuPower¥
F-PFS¥
®*
AX-CAP®*
BitSiC¥
Build it Now¥
CorePLUS¥
CorePOWER¥
CROSSVOLT¥
CTL¥
FRFET®
PowerTrench®
PowerXS™
Programmable Active Droop¥
QFET®
Global Power ResourceSM
GreenBridge¥
Green FPS¥
Green FPS¥ e-Series¥
Gmax¥
TinyBoost¥
TinyBuck¥
TinyCalc¥
TinyLogic®
TINYOPTO¥
TinyPower¥
TinyPWM¥
TinyWire¥
TranSiC¥
QS¥
Quiet Series¥
RapidConfigure¥
¥
GTO¥
IntelliMAX¥
Current Transfer Logic¥
DEUXPEED®
Dual Cool™
EcoSPARK®
EfficientMax¥
ISOPLANAR¥
Making Small Speakers Sound Louder
and Better™
Saving our world, 1mW/W/kW at a time™
SignalWise¥
SmartMax¥
TriFault Detect¥
TRUECURRENT®*
PSerDes¥
MegaBuck¥
SMART START¥
Solutions for Your Success¥
SPM®
ESBC¥
MICROCOUPLER¥
MicroFET¥
®
MicroPak¥
Fairchild®
STEALTH¥
UHC®
Ultra FRFET¥
UniFET¥
VCX¥
VisualMax¥
VoltagePlus¥
XS™
MicroPak2¥
Fairchild Semiconductor®
FACT Quiet Series¥
FACT®
SuperFET®
MillerDrive¥
SuperSOT¥-3
MotionMax¥
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mWSaver¥
FAST®
SuperSOT¥-8
OptoHiT¥
SupreMOS®
FastvCore¥
OPTOLOGIC®
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