KA78R05
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Features
?1A / 5V Output low dropout voltage regulator ?TO220 Full-Mold package (4PIN)?Overcurrent protection, Thermal shutdown ?Overvoltage protection, Short-Circuit protection ?With output disable function Description
The KA78R05 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 KA78R05 is below 0.5V in full rated current(1A). This regulator has various function such as peak current protection, thermal shut down, overvoltage protection and output disable function.
TO-220F-4L
1. Vin
2. V O
3. GND
4. Vdis
1
KA78R05
Low Dropout Voltage Regulator
KA78R05
Absolute Maximum Ratings
Parameter Symbol Value Unit Remark Input Voltage Vin35V-Disable Voltage Vdis35V-Output Current Io 1.0A-Power Dissipation 1Pd1 1.5W No Heatsink Power Dissipation 2 Pd215W With Heatsink Junction Temperature Tj+150°C-Operating Temperature Topr-20 ~ +80°C-Thermal Resistance, Junction-to Case (Note2)Rθjc 4.31°C/W-Thermal Resistance, Junction-to-Air (Note2)Rθja48.83°C/W-Thermal Shutdown Temperature Ttsd150°C-
Electrical Characteristics
(Vin = 7V, Io = 0.5A, Ta = 25°C, unless otherwise specified)
Parameter Symbol Conditions Min.Typ.Max.Unit Output Voltage Vo- 4.885 5.12V Load Regulation Rload5mA < Io < 1A-0.1 2.0% Line Regulation Rline6V < Vin < 12V-0.5 2.5% Ripple Rejection Ratio RR note14555-dB Dropout Voltage Vdrop Io = 1A--0.5V Disable Voltage High VdisH Output Active 2.0--V Disable Voltage Low VdisL Output Disabled--0.8V Disable Bias Current High IdisH Vdis = 2.7V--20μA Disable Bias Current Low IdisL Vdis = 0.4V---0.4mA Quiescent Current Iq Io = 0A--10mA
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
KA78R05 Typical Perfomance Characteristics
Figure 1.Output Voltage vs. Input Voltage Figure 3.Output Voltage vs. Disable Voltage Figure 5.Quiescent Current vs. Temperature(Tj)
Figure 2.Quiescent Current vs. Input Voltage
Figure 4.Output Voltage vs. Temperature(Tj) Figure 6.Dropout Voltage vs. Junction Temperature
KA78R05
Typical Perfomance Characteristics (Continued)
Figure 7.Power Dissipation vs. Temperature(Ta)Figure 8. Overcurrent Protection Characteristics
(Typical Value)
KA78R05 Typical Application
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)
KA78R05
Mechanical Dimensions
Package
Dimensions in millimeters
TO-220F-4L
KA78R05 Mechanical Dimensions (Continued)
Package
Dimensions in millimeters
TO-220F-4L(Forming)
KA78R05
Mechanical Dimensions (Continued)
Package
Dimensions in millimeters
KA78R05 Ordering Information
Product Number Package Operating Temperature
KA78R05TU TO-220F-4L
-20°C to + 80°C
KA78R05YDTU TO-220F-4L(Forming)
KA78R05TSTU TO-220F-4L(Short Lead)
KA78R05
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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.
DISCLAIMER
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