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Part: KA78R09TU
Category:
Description: KA78R09 - 1A Fixed 9V Low Dropout Voltage Regulator (LDO)
Company: Fairchild Semiconductor
Datasheet: Download KA78R09TU datasheet File size : 429 kB
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www.fairchildsemi.com
KA78R09
Low Dropout Voltage Regulator
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 protection, thermal shut down, overvoltage protection and output disable function.
TO-220F-4L
1
1. Vin 2. Vo 3. GND 4. Vids
Internal Block Diagram
Vin 1 Q1 2 Vo
THERMAL SHUTDOWN
OVERVOLTAGE PROTECTION
BANDGAP REFERENCE
+ R1
SOA PROTECTION HIGH / LOW Vdis 4 + OUTPUT ON / OFF
R2 1.4V
SHOORTCIRCUIT SH RT- C CUIT
PROTECTION
3 GND
Rev. 1.0.2
©2001 Fairchild Semiconductor Corporation
KA78R09
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 P d1 Pd2 Tj T opr Rjc Rja Ttsd Value 35 35 1.0 1.5 15 + 150 -20 ~ +80 4.31 48.83 150 Unit V V A W W °C °C ° C /W ° C /W °C Remark No Heatsink With Heatsink -
Electrical Characteristics
(Vin =11V, Io = 0.5A, 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 5mA < Io < 1A 10V < Vin < 25V note1 Io = 1A Output Active Output Disabled Vdis = 2.7V Vdis = 0.4V Io = 0A Conditions Min. 8. 7 8 45 2.0 Typ. 9 0.1 0. 5 55 Max. 9. 2 2 2.0 2.5 0.5 0.8 20 -0.4 10 Unit V % % dB V V V µA mA mA
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
KA78R09
Typical Perfomance Characteristics
10 8 7 6 5 4 3 2 1 0 0 5 10 15 20 25
0 0 5 10 15 20 25
RL=9 RL=
50
Quiescent current Iq(mA)
Output voltage Vo(V)
9 8
40 30 20
RL=
10
Input voltage Vin (V)
Input voltage Vin (V)
Figure 1. Output Voltage vs. Input Voltage
Figure 2. Quiescent Current vs. Input Voltage
10 9
9.06
Output voltage Vo(V)
Output voltage Vo(V)
8 7 6 5 4 3 2 1 0 0 0.5 1 1.5 2 2.5 3
9.04 9.02 9.00 8.98 8.96 8.94 8.92 -25
0
Disable voltage Vdis (V)
75 25 50 TEMPERATURE Tj(oC )
8
100
125
Figure 3. Output Voltage vs. Disable Voltage
Figure 4. Output Voltage vs. Temperature(Tj)
Quiescent current Iq(mA)
Dropout voltage Vdrop(V)
10 8 6 4 2 0
0.6 0.5 0.4 Io=1A 0.3 0.2 0.1 0.25A 0 0.75A 0.5A
-25
0
25
50
75
100
125
-25
0
25
50
75
100
125
Junction temperature Tj(oC)
Junction temperature Tj(oC)
Figure 5. Quiescent Current vs. Temperature(Tj)
Figure 6. Dropout Voltage vs. Junction Temperature
3
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