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KA78M05 / LM78M05 / MC78M05 — 3-Terminal 0.5 A Positive Voltage Regulator
© 2001 Fairchild Semiconductor Corporation www.fairchildsemi.com
KA78M05 / LM78M05 / MC78M05 Rev. 2.5
January 2015
KA78M05 / LM78M05 / MC78M05
3-Terminal 0.5 A Positive Voltage Regulator
Features
• Output Current up to 0.5 A
• Output Voltages of 5 V
• Thermal Overload Protection
• Short-Circuit Protection
• Output Transistor Safe Operating Area (SOA) Protection
Ordering Information(1)
Note:
1. Refer to below figure for TM / TF suffix of DPAK packing option.
Product Number Package Packing Method Operating Temperature
KA78M05TU TO-220 (Dual Gauge) Rail
-40 to +125°C
KA78M05RTM D-PAK Tape and Reel
MC78M05CDTX
LM78M05CT TO-220 (Single Gauge) Rail
Description
The KA78M05 / LM78M05 / MC78M05 series of three-
terminal positiv e regulators i s availa ble in the T O-220 / D-
PAK packages, making it useful in a wide range of appli-
cations.
TO-220
D-PAK
1. Input 2. GND 3. Output
1
1
GND
GND
KA78M05 / LM78M05 / MC78M05 — 3-Terminal 0.5 A Positive Voltage Regulator
© 2001 Fairchild Semiconductor Corporation www.fairchildsemi.com
KA78M05 / LM78M05 / MC78M05 Rev. 2.5 2
Block Diagram
Figure 1. Block Diagram
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be opera-
ble above the re co mmen ded operating conditions and s tres si ng the parts to these level s i s not recommended. In addi-
tion, extended exposure to stresses above the recommended operating conditions may affect device reliability. The
absolute maximum ratings are stress ratings only.
Notes:
2. Thermal resistance test board.
Size: 76.2 mm x 114.3 mm x 1.6 mm (1S0P)
JEDEC standard: JESD51-3, JESD51-7
3. Assume no ambient airflow.
Symbol Parameter Value Unit
VIInput Voltage (for VO = 5 V) 35 V
RθJC Thermal Resistance, Junctio n-Ca se(2) TO-220 (TC = +25°C) 2.5 °C/W
RθJA Thermal Resistance, Junctio n-Ai r (2), (3) TO-220 (TA = +25°C) 66 °C/W
D-PAK (TA = +25°C) 92
TOPR Operating Junction Temperature Range -40 to +125 °C
TJ(MAX) Maximum Junction Temperature Range 150 °C
TSTG Storage Temperature Range -65 to +150 °C
OUTPUT
3
R1
R2
GND
2
1
INPUT SERIES
PASS
ELEMENT
SOA
PROTECTION
CURRENT
GENERATOR
STARTING
CIRCUIT REFERENCE
VOLTAGE ERROR
AMPLIFIER
THERMAL
PROTECTION
KA78M05 / LM78M05 / MC78M05 — 3-Terminal 0.5 A Positive Voltage Regulator
© 2001 Fairchild Semiconductor Corporation www.fairchildsemi.com
KA78M05 / LM78M05 / MC78M05 Rev. 2.5 3
Electrical Characteristics
Refer to the test circuits, -40 < TJ < +125°C, IO = 350 mA, VI = 10 V, CI = 0.33 μF, CO = 0.1 μF unless otherwise speci-
fied.(4)
Notes:
4. The parameters are guaranteed across the temperature range by characterization.
5. Load and line regul ation are sp ecified at c onst ant junc tion temperatu re. Change in Vo due to heating effects must be
taken into account separately. Pulse testing with low duty is used.
Symbol Parameter Conditions Min. Typ. Max. Unit
VOOutput Voltage TJ = +25°C 4.8 5.0 5.2 V
IO = 5 mA to 350 mA,
VI = 7 V to 20 V 4.75 5.00 5.25
ΔVOLine Regulation(5) IO = 200 mA
TJ = +25°CVI = 7 V to 25 V 100 mV
VI = 8 V to 25 V 50
ΔVOLoad Regulation(5) IO = 5 mA to 0.5 A, TJ = +25°C 100 mV
IO = 5 mA to 200 mA, TJ = +25 °C50
IQQuiescent Current TJ = +25°C4.06.0mA
ΔIQQuiescent Current Change IO = 5 mA to 350 mA 0.5 mA
IO = 200 mA,
VI = 8 V to 25 V 0.8
ΔV/ΔT Output Voltage Drift IO = 5 mA
TJ = -40 to +125°C-0.5 mV/°C
VNOutput Noise Voltage f = 10 Hz to 100 kHz 40 μV/Vo
RR Ripple Rejection f = 120 Hz, IO = 300 mA
VI = 8 V to 18 V, TJ = +25 °C80 dB
VDDropout Voltage TJ = +25°C, IO = 500 mA 2 V
ISC Short-Circ uit Current TJ = +25°C, VI = 35 V 300 mA
IPK Peak Current TJ = +25°C700mA
KA78M05 / LM78M05 / MC78M05 — 3-Terminal 0.5 A Positive Voltage Regulator
© 2001 Fairchild Semiconductor Corporation www.fairchildsemi.com
KA78M05 / LM78M05 / MC78M05 Rev. 2.5 4
Typical Applications(6), (7)
Figure 2. Fixed-Output Regulator
Figure 3. Constant-Current Regulator
Notes:
6. CI is required if the regulator is located an appreciable distance from the power supply filter.
7. Although no output capacitor is needed for stability, it does improve transient response.
0.1 μF
CO
CI0.3 μF
VO
VI13
2
KA78M05
LM78M05
MC78M05
0.1 μF
CO
CI0.33 μFIO
VI13
2VXX
IO
R1
IO = R1 +IO
Vxx
KA78M05
LM78M05
MC78M05
KA78M05 / LM78M05 / MC78M05 — 3-Terminal 0.5 A Positive Voltage Regulator
© 2001 Fairchild Semiconductor Corporation www.fairchildsemi.com
KA78M05 / LM78M05 / MC78M05 Rev. 2.5 5
Typical Applications (Continued)
Figure 4. Circuit for Increasing Output Voltage
Figure 5. Adjustable Output Regulator (7 to 30 V)
Figure 6. 0.5 to 10 V Regulator
0.1 μF
CO
CI0.33 μFIO
VI13
2VXX
VO
R1
R2
IR1 ≥ 5IO
VO = VXX (1+R2/R1) +IOR2
KA78M05
LM78M05
MC78M05
0.1 μF
CO
CI0.33 μF
VO
VI13
2
10 kΩ
3
2
4
7
6LM741
KA78M05
LM78M05
MC78M05
0.1μF
C2
C1
0.33 μF
VO
VI13
2
10 kΩ
3
2
4
7
6LM741 R3
R1
VXX
R4
R5
910 Ω
9.1 kΩ
13 V < VI < 25 V
-7 V < -VI < 17 V
_
+VO = VXX R1
R4
KA78M05
LM78M05
MC78M05
KA78M05 / LM78M05 / MC78M05 — 3-Terminal 0.5 A Positive Voltage Regulator
© 2001 Fairchild Semiconductor Corporation www.fairchildsemi.com
KA78M05 / LM78M05 / MC78M05 Rev. 2.5 6
Physical Dimensions
Figure 7. TO-220, MOLDED, 3LEAD, JEDEC VARIATION AB
KA78M05 / LM78M05 / MC78M05 — 3-Terminal 0.5 A Positive Voltage Regulator
© 2001 Fairchild Semiconductor Corporation www.fairchildsemi.com
KA78M05 / LM78M05 / MC78M05 Rev. 2.5 7
Physical Dimensions (Continued)
Figure 8. 3-LEAD, TO-252, JEDEC TO-252 VAR. AB, SURFACE MOUNT (DPAK)
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© Fairchild Semiconductor Corporation www.fairchildsemi.com
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