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KA378R05
Low Dropout Voltage Regulator
Features
Description
•
•
•
•
•
The KA378R05 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 KA378R05 is below 0.5V in full rated
current(3A). This regulator has various function such as
peak current protection, thermal shut down, overvoltage
protection and output disable function.
3A / 5V Output low dropout voltage regulator
TO220 Full-Mold package (4PIN)
Overcurrent protection, Thermal shutdown
Overvoltage protection, Short-Circuit protection
With output disable function
TO-220F-4L
1
1.Vin 2. Vo 3. GND 4. Vdis
Internal Block Diagram
Vin
Q1
1
THERMAL SHUTDOWN
BANDGAP REFERENCE
2
Vo
OVERVOLTAGE
PROTECTION
+
R1
SOA PROTECTION
HIGH / LOW
Vdis
4
+
1.4V
OUTPUT
ON / OFF
SHORT-CIRCUIT
SHORTCIRCUIT
R2
PROTECTION
3
GND
Rev. 1.0.2
©2001 Fairchild Semiconductor Corporation
KA378R05
Absolute Maximum Ratings
Parameter
Symbol
Value
Unit
Remark
Input Voltage
Vin
35
V
-
Disable Voltage
Vdis
35
V
-
Output Current
Io
3.0
A
-
Power Dissipation 1
Pd1
1.5
W
No Heatsink
Power Dissipation 2
Pd2
15
W
With Heatsink
Tj
150
°C
-
Junction Temperature
Operating Temperature
Topr
-20 ~ 80
°C
-
Thermal Resistance, Junction-to-Case(Note2)
Rθjc
2.9
°C/W
-
Thermal Shutdown Temperature
Ttsd
150
°C
-
Storage Temperature
Tstg
-65 ~ 150
°C
-
Electrical Characteristics
(Vin=7V, Io=1.5A, Ta=25°C, unless otherwise specified)
Parameter
Output Voltage
Symbol
Conditions
Min.
Typ.
Max.
Unit
Vo
-
4.88
5
5.12
V
-
0.1
2.0
%
Load Regulation
Rload
Line Regulation
Rline
Ripple Rejection Ratio
RR
5mA < Io < 3A
6V < Vin < 12V
note1
0.5
2.5
%
55
-
dB
-
-
0.5
V
2.0
-
-
V
-
-
0.8
V
Dropout Voltage
Vdrop
Io = 3A
Disable Voltage High
VdisH
Output Active
Disable Voltage Low
VdisL
Output Disabled
Disable Bias Current High
IdisH
Vdis = 2.7V
-
-
20
µA
Disable Bias Current Low
IdisL
Vdis = 0.4V
-
-
-0.4
mA
Io = 0A
-
-
10
mA
Quiescent Current
Iq
Note:
1.These parameters, although guaranteed, are not 100% tested in production.
2. Junction -to-case thermal resistance test enviroments.
-.Pneumatic heat sink fixture.
-.Clamping pressure 60psi through 12mm diameter cylinder.
-.Thermal grease applied between PKG and heat sink fixture.
2
45
KA378R05
Typical Perfomance Characteristics
5
RL=
4
3
RL=1.7Ω
2
80
60
40
20
RL=
8
i
Quescent
current Iq(mA)
6
8
Output voltage Vo(V)
7
1
0
0
5
0
10
0
15
2
Input voltage Vin (V)
6
8
10
Figure 2. Quiescent Current vs. Input Voltage
7
5.06
6
5.04
Output voltage Vo(V)
Output voltage Vo(V)
Figure 1. Output Voltage vs. Input Voltage
5
4
3
2
1
5.02
5.00
4.98
4.96
4.94
0
0
0.5
1
1.5
2
2.5
4.92
-25
3
0
Disable voltage Vdis (V)
Figure 3. Output Voltage vs. Disable Voltage
8
6
4
75
25
50
TEMPERATURE Tj(oC)
100
125
Figure 4. Output Voltage vs. Temperature(Tj)
Dropout voltage Vdrop(V)
10
i
Quescent
current Iq(mA)
4
Input voltage Vin (V)
0.6
0.5
0.4
Io=3A
0.3
2.0A
0.2
2
0.1
0
0
1.0A
0.5A
-25
0
25
50
75
100
125
Junction temperature Tj (oC)
Figure 5. Quiescent Current vs. Temperature(Tj)
-25
0
25
50
75
100
125
Junction temperature Tj(oC)
Figure 6. Dropout Voltage vs. Junction Temperature
3
KA378R05
Typical Perfomance Characteristics (Continued)
100
Relative output voltage(%)
Power dissipation PD D(W)
20
15
10
5
0
-25
60
40
20
0
0
75
25
50
TEMPERATURE Tj(
a oC)
100
125
Figure 7. Power Dissipation vs. Temperature(Ta)
4
80
0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
Output Current(A)
Figure 8. Overcurrent Protection Characteristics
(Typical Value)
KA378R05
Typical Application
Vo
Vin
1
2
+
+
3
GND
4
Vdis
Disable Signal
Figure 1. Application Circuit
• Ci is required if regulator is located an appreciable distance from power supply filter.
• Co improves stability and transient response.(Co > 47µF)
5
KA378R05
Mechanical Dimensions
Package
Dimensions in millimeters
TO-220F-4L
4.50 ±0.20
ø3.20 ±0.20
(5.00)
2.80 ±0.20
6.50 ±0.20
(1.00)
(13.60)
(3.30)
10.30 ±0.30
1.25MIN
°)
3-1.05MIN
3-1.30MAX
(45
15.70 ±0.20
(1.00)
15.60 ±0.20
3.40 ±0.10
10.00 ±0.20
1.50MAX
0.60 ±0.10
2.54TYP
[2.54 ±0.25]
1.50 ±0.20
+0.10
0.50 –0.05
(1.19)
6
(7.62)
(1.19)
KA378R05
Ordering Information
Product Number
Package
Operating Temperature
KA378R05
TO-220F-4L
-20°C to + 80°C
7
KA378R05
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.
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 2001 Fairchild Semiconductor Corporation
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Authorized Distributor
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