Fairchild Semiconductor KA78R09YDTU, KA78R09TU Datasheet
©2001 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.2
Features
• 1A / 9V 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 KA78R09 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 KA78R09 is below 0.5V in full rated
current(1A). This regulator has various function such as
peak current p r otection, therm al shut down, overvoltage
protection a nd output disable function.
TO-220F-4L
1. Vin 2. Vo 3. GND 4. Vids
1
Internal Block Diagram
THERMAL SHUTDOWN
BANDGAP REFERENCE
OVERVOLTAGE
PROTECTION
SOA PROTECTION
SHORTCIRCUIT
PROTECTION
1
4
3
2
Vin
Vdis
Vo
GND
HIGH / LOW OUTPUT
ON / OFF
Q1
R1
R2
+
+
1.4V
SHORT-CIRCUIT
KA78R09
Low Dropout Voltage Regulator
KA78R09
2
Absolute Maximum Ratings
Electrical Characteristics
(Vin =11V, Io = 0.5A, Ta = 25 °C, unless otherwise specified)
Note:
1.These parameters, although guaranteed, are not 100% tested in production.
2. Junction -to -case thermal resistance test enviroments.
-. Pneumatic heat sink fixtu re.
-. Clamping pressure 60psi through 12mm diameter cyl ind er.
-. Thermal grease applied bet ween PKG and heat sink fixture
Parameter Symbol Value Unit Remark
Input Voltage Vin 35 V Disable Voltage Vdis 35 V Output Current Io 1.0 A Power Dissipation 1 Pd1 1.5 W No Heatsink
Power Dissipation 2 Pd2 15 W 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) Rθja 48.83 °C/W Thermal Shutdown Temperature Ttsd 150 °C-
Parameter Symbol Conditions Min. Typ. Max. Unit
Output Voltage Vo - 8.78 9 9.22 V
Load Regulation Rload 5mA < Io < 1A - 0.1 2.0 %
Line Regulation Rline 10V < Vin < 25V - 0.5 2.5 %
Ripple Rejection Ratio RR note1 45 55 - dB
Dropout Voltage Vdrop Io = 1A - - 0.5 V
Disable Voltage High VdisH Output Active 2.0 - - V
Disable Voltage Low VdisL Output Disabled - - 0.8 V
Disable Bias Current High IdisH Vdis = 2.7V - - 20 µA
Disable Bias Current Low IdisL Vdis = 0.4V - - -0.4 mA
Quiescent Current Iq Io = 0A - - 10 mA
KA78R09
3
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
510 15
Input voltage Vin (V)
0
Output voltage Vo(V)
10
9
8
7
6
5
4
3
2
1
0
20 25
RL=
RL=9ΩΩΩΩ
8
0
Outpu t v ol tage Vo(V)
3
Disable voltage Vdis (V)
0.5
1.5
122.5
10
9
8
7
6
5
4
3
2
1
0
10
8
6
4
2
0
Quescent current Iq(mA)
Junction temperature Tj(oC)
75
125
02550
100
-25
i
50
40
30
20
10
0
0
Quescent current Iq( m A )
Input voltage Vin (V)
RL=
510 15 2025
8
i
9.04
9.02
9.00
9.06
-25
Output voltage Vo(V)
TEMPERATURE Tj(oC )
75
125
02550
100
8.96
8.94
8.92
8.98
125
0.6
0.5
0.4
0.3
0
Dropout voltage Vdrop(V)
Junction temperature Tj(oC)
0.2
0.1
75
02550
100
-25
Io=1A
0.75A
0.5A
0.25A
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