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KA278R05. 278R05 Datasheet |
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KA278R05
Low Dropout Voltage Regulator
www.fairchildsemi.com
Features
• 2A/5V 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 KA278R05 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 KA278R05 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 and an output disable function.
TO-220F-4L
1
1.Vin 2. Vo 3. GND 4. Vdis
Internal Block Diagram
Vin 1
THERMAL SHUTDOWN
BANDGAP REFERENCE
Vdis
HIGH / LOW
4
-
+
OUTPUT
ON / OFF
1.4V
OVERVOLTAGE
PROTECTION
-
+
SOA PROTECTION
SHSOHROTR-CTCIRIRCCUUITIT
PROTECTION
Q1
R1
R2
2 Vo
©2002 Fairchild Semiconductor Corporation
3
GND
Rev. 1.0.2
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KA278R05
Absolute Maximum Ratings
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)
Thermal Shutdown Temperature
Symbol
Vin
Vdis
Io
Pd1
Pd2
Tj
Topr
Rθjc
Rθja
Ttsd
Value
35
35
2.0
1.5
15
150
-20 ~ 80
2.9
48.51
150
Unit
V
V
A
W
W
°C
°C
°C/W
°C/W
°C
Remark
-
-
-
No Heatsink
With Heatsink
-
-
-
-
-
Electrical Characteristics
(Vin=7V, Io=1.0A, Ta=25°C , unless otherwise specified)
Parameter
Output Voltage
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
Symbol
Vo
Rload
Rline
RR
Vdrop
VdisH
VdisL
IdisH
IdisL
Iq
Conditions
-
5mA < Io < 2A
6V < Vin < 12V
note1
Io = 2A
Output Active
Output Disabled
Vdis = 2.7V
Vdis = 0.4V
Io = 0A
Min. Typ. Max. Unit
4.88 5 5.12 V
- 0.1 2.0 %
- 0.5 2.5 %
45 55 - dB
- - 0.5 V
2.0 - - V
- - 0.8 V
- - 20 µA
- - -0.4 mA
- - 10 mA
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
2
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Typical Performance Characteristics
7
6
5
RL=
4
3
2
RL=2.5Ω
1
0
0 5 10
Input voltage Vin (V)
15
Figure 1. Output Voltage vs. Input Voltage
KA278R05
50
40
30
20
10
0
0
RL=
5 10
Input voltage Vin (V)
15
Figure 2. Quiescent Current vs. Input Voltage
7
6
5
4
3
2
1
0
0 0.5 1 1.5 2 2.5 3
Disable voltage Vdis (V)
Figure 3. Output Voltage vs. Disable Voltage
5.06
5.04
5.02
5.00
4.98
4.96
4.94
4.92
-25
0 25 50 75 100 125
TeTmEpMePrEaRtuArTeUTRj(E°CTj)(oC)
Figure 4. Output Voltage vs. Temperature(Tj)
8
6
4
2
0
-25
0 25 50 75 100 125
Junction temperature Tj(oC)
Figure 5. Quiescent Current vs. Temperature(Tj)
0.6
0.5
0.4
0.3
0.2
0.1
0
-25
Io=2A
1.5A
1.0A
0.5A
0 25 50 75 100 125
Junction temperature Tj(oC)
Figure 6. Dropout Voltage vs. Junction Temperature
3
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