www.fairchildsemi.com
KA78R05
Low Dropout Voltage Regulator
Features |
Description |
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• 1A / 5V Output low dropout voltage regulator |
The KA78R05 is a low-dropout voltage regulator suitable |
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• TO220 Full-Mold package (4PIN) |
for various electronic equipments. It provides constant |
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• Overcurrent protection, Thermal shutdown |
voltage power source with TO-220 4 lead full mold package. |
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• Overvoltage protection, Short-Circuit protection |
Dropout voltage of KA78R05 is below 0.5V in full rated |
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• With output disable function |
current(1A). This regulator has various function such as |
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peak current protection, thermal shut down, overvoltage |
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protection and output disable function. |
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TO-220F-4L |
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1. Vin 2. VO 3. GND 4. Vdis |
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Internal Block Diagram |
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Vin 1 |
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Q1 |
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2 Vo |
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THERMAL SHUTDOWN |
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OVERVOLTAGE |
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PROTECTION |
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BANDGAP REFERENCE |
- |
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+ |
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R1 |
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SOA PROTECTION |
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HIGH / LOW |
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OUTPUT |
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Vdis 4 |
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- |
ON / OFF |
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+ |
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R2 |
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1.4V |
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SHORTCIRCUIT- |
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PROTECTION |
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3
GND
Rev. 1.0.4
©2001 Fairchild Semiconductor Corporation
KA78R05
Absolute Maximum Ratings
Parameter |
Symbol |
Value |
Unit |
Remark |
Input Voltage |
Vin |
35 |
V |
- |
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Disable Voltage |
Vdis |
35 |
V |
- |
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Output Current |
Io |
1.0 |
A |
- |
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Power Dissipation 1 |
Pd1 |
1.5 |
W |
No Heatsink |
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Power Dissipation 2 |
Pd2 |
15 |
W |
With Heatsink |
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Junction Temperature |
Tj |
+150 |
° C |
- |
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Operating Temperature |
Topr |
-20 ~ +80 |
° C |
- |
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Thermal Resistance, Junction-to Case (Note2) |
Rθ jc |
4.31 |
° C/W |
- |
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Thermal Resistance, Junction-to-Air (Note2) |
Rθ ja |
48.83 |
° C/W |
- |
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Thermal Shutdown Temperature |
Ttsd |
150 |
° C |
- |
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Electrical Characteristics
(Vin = 7V, Io = 0.5A, Ta = 25 ° C, unless otherwise specified)
Parameter |
Symbol |
Conditions |
Min. |
Typ. |
Max. |
Unit |
Output Voltage |
Vo |
- |
4.88 |
5 |
5.12 |
V |
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Load Regulation |
Rload |
5mA < Io < 1A |
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0.1 |
2.0 |
% |
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Line Regulation |
Rline |
6V < Vin < 12V |
- |
0.5 |
2.5 |
% |
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Ripple Rejection Ratio |
RR |
note1 |
45 |
55 |
- |
dB |
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Dropout Voltage |
Vdrop |
Io = 1A |
- |
- |
0.5 |
V |
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Disable Voltage High |
VdisH |
Output Active |
2.0 |
- |
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V |
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Disable Voltage Low |
VdisL |
Output Disabled |
- |
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0.8 |
V |
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Disable Bias Current High |
IdisH |
Vdis = 2.7V |
- |
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20 |
µ A |
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Disable Bias Current Low |
IdisL |
Vdis = 0.4V |
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-0.4 |
mA |
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Quiescent Current |
Iq |
Io = 0A |
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10 |
mA |
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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
KA78R05
Typical Perfomance Characteristics
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7 |
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Vo(V) |
6 |
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5 |
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voltage |
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RL= |
8 |
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4 |
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Output |
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2 |
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RL=5Ω |
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1 |
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0 |
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0 |
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5 |
10 |
15 |
Input voltage Vin (V)
Figure 1. Output Voltage vs. Input Voltage
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7 |
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Vo(V) |
6 |
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5 |
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voltage |
4 |
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Output |
3 |
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2 |
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1 |
0 |
0 |
0.5 |
1 |
1.5 |
2 |
2.5 |
3 |
Disable voltage Vdis (V)
Figure 3. Output Voltage vs. Disable Voltage
Iq(mA) |
10 |
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8 |
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current |
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6 |
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iQuescent |
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2 |
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4 |
0 -25 |
0 |
25 |
50 |
75 |
100 125 |
Junction temperature Tj(oC)
Figure 5. Quiescent Current vs. Temperature(Tj)
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50 |
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Iq(mA) |
40 |
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current |
30 |
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Quescenti |
20 |
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10 |
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RL=8 |
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0 0 |
5 |
10 |
15 |
Input voltage Vin (V)
Figure 2. Quiescent Current vs. Input Voltage
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5.06 |
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Vo(V) |
5.04 |
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5.02 |
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voltage |
5.00 |
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4.98 |
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Output |
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4.96 |
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4.94 |
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4.92 |
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75 |
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-25 |
0 |
25 |
50 |
100 |
125 |
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TEMPERATURE Tj(oC ) |
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Figure 4. Output Voltage vs. Temperature(Tj)
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0.6 |
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Vdrop(V) |
0.5 |
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0.4 |
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Io=3A |
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voltage |
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0.3 |
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2.0A |
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Dropout |
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0.2 |
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1.0A |
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0.1 |
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0.5A |
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0 |
0 |
25 |
50 |
75 |
100 |
125 |
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-25 |
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JunctiontemperatureTj(oC) |
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Figure 6. Dropout Voltage vs. Junction Temperature
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