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KA78R08
Low Dropout Voltage Regulator
Features
* * * * * 1A / 8V 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 KA78R08 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 KA78R08 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
1.Vin 2. V O 3. GND 4. Vdis
Internal Block Diagram
Q1
Vin
1
2
Vo
THERMAL SHUTDOWN
OVERVOLTAGE PROTECTION
BANDGAP REFERENCE
+ R1
SOA PROTECTION HIGH / LOW Vdis 4 + OUTPUT ON / OFF
R2 1.4V
SHORT-CIRCUIT SHORTCIRCUIT
PROTECTION
3 GND
Rev. 1.0.1
(c)2001 Fairchild Semiconductor Corporation
KA78R08
Absolute Maximum Ratings
Parameter Input Voltage Disable Voltage Output Current Power Dissipation 1 Power Dissipation 2 Junction Temperature Operating Temperature Symbol Vin Vdis Io Pd1 Pd2 Tj Topr Value 35 35 1.0 1.5 15 +150 -20 ~ +80 Unit V V A W W C C Remark No Heatsink With Heatsink -
Electrical Characteristics
(Vin =10V, Io = 0.5A, Ta = 25C , 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 5mA < Io < 1A 9V < Vin < 25V note1 Io = 1A Output Active Output Disabled Vdis = 2.7V Vdis = 0.4V Io = 0A Conditions Min. 7.8 45 2.0 Typ. 8 0.1 0.5 55 Max. 8.2 2.0 2.5 0.5 0.8 20 -0.4 10 Unit V % % dB V V V A mA mA
Note: 1.These parameters, although guaranteed, are not 100% tested in production.
2
KA78R08
Typical Perfomance Characteristics
10 8 7 6 5 4 3 2 1 0
0
RL=8 RL=
50
Quescent current Iq(mA) i
Output voltage Vo(V)
9
8
40
30
20
RL= 8
10
0
5
10
15
20
25
0
5
10
15
20
25
Input voltage Vin (V)
Input voltage Vin (V)
Figure 1.Output Voltage vs. Input Voltage
Figure 2.Quiescent Current vs. Input Voltage
10 9
8.06 8.04 8.02 8.00 7.98 7.96 7.94 7.92 -25
Output voltage Vo(V)
7 6 5 4 3 2 1 0 0.5 1 1.5 2 2.5 3
Output voltage Vo(V)
8
0
25
50
75
100
125
Disable voltage Vdis (V)
TEMPERATURE Tj(oC)
Figure 3.Output Voltage vs. Disable Voltage
Figure 4.Output Voltage vs. Temperature(Tj)
Quescent current Iq(mA) i
Dropout voltage Vdrop(V)
10 8
0.6 0.5 0.4 Io=1A 0.3 0.75A 0.2 0.5A 0.1 0.25A 0 -25
6
4
2
0
-25
0
25
50
75
100
125
0
25
50
75
100
125
Junction temperature Tj( oC )
Junction temperature Tj(o C)
Figure 5.Quiescent Current vs. Temperature(Tj)
Figure 6.Dropout Voltage vs. Junction Temperature
3
KA78R08
Typical Perfomance Characteristics (continued)
20 100
Relative output voltage(%)
Power dissipation P D(W) D
80 60
15
10
40
5
20
0 -25
0 0 25 50 75 100 125
0
0.5
1.0
1.5
2.0
2.5
TEMPERATURE TJ( oC) a
Output Current(A)
Figure 7.Power Dissipation vs. Temperature(Ta)
Figure 8. Overcurrent Protection Characteristics (Typical Value)
4
KA78R08
Typical Application
Vin 1
+
Vo 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 > 47 F)
5
KA78R08
Mechanical Dimensions
Package Dimensions in millimeters
TO-220F-4L
6
KA78R08
Ordering Information
Product Number KA78R08 Package TO-220F-4L Operating Temperature -20 C to + 80C
7
KA78R08
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.
www.fairchildsemi.com 4/26/01 0.0m 001 Stock#DSxxxxxxxx (c) 2001 Fairchild Semiconductor Corporation
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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