©2011 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.8
Features
• Output Current up to 0.5A
• Output Voltages of 5V
• Thermal Overload Protection
• Short Circuit Protection
• Output Transistor Safe Operating Area (SOA)Protection
Description
The MC78M05/LM78M05 series of three-terminal
positive regulators are available in the TO-220/D-PAK
package with several fixed output voltages making it useful
in a wide range of applications.
TO-220 (Single Gauge)
D-PAK
1. Input 2. GND 3. Output
1
1
GND
GND
Internal Block Digram
OUTPUT
3
R1
R2
GND
2
1
INPUT SERIES
PASS
ELEMENT
SOA
PROTECTION
CURRENT
GENERATOR
STARTING
CIRCUIT REFERENCE
VOLTAGE ERROR
AMPLIFIER
THERMAL
PROTECTION
MC78M05/LM78M05
3-Terminal 0.5A Positive Voltage Regulator
MC78M05/LM78M05
2
Absolute Maximum Ratings
Note:
1. Thermal resistance test board
Size: 76.2mm * 114.3mm * 1.6mm(1S0P)
JEDEC standard: JESD51-3, JESD51-7
2. Assume no ambient airflow
Electrical Characteristics (MC78M05/LM78M05)
(Refer to the test circuits, 0 < TJ < +125°C, IO=350mA, VI=10V, unless otherwise specified, CI = 0.33μF, CO=0.1μF)
Note:
3. Load and line regulation are specified at constant junction temperature. Change in Vo due to heating effects must be taken
into account separately. Pulse testing with low duty is used.
Parameter Symbol Value Unit
Input Voltage (for VO = 5V) VI35 V
Thermal Resistance Junction-Case (Note1)
TO-220 (Tc = +25°C) RθJC 2.5 °C/W
Thermal Resistance Junction-Air (Note1, 2)
TO-220 (Ta = +25°C)
D-PAK (Ta = +25°C) RθJA 66
92 °C/W
Operating Junction Temperature Range TOPR 0 ~ +150 °C
Storage Temperature Range TSTG -65 ~ +150 °C
Parameter Symbol Conditions Min. Typ. Max. Unit
Output Voltage VOTJ = +25°C 4.855.2 V
IO = 5mA to 350mA
VI = 7V to 20V 4.75 5 5.25
Line Regulation (Note3) ΔVOIO = 200mA
TJ =+25°CVI = 7V to 25V - - 100 mV
VI = 8V to 25V - - 50
Load Regulation (Note3) ΔVOIO = 5mA to 0.5A, TJ =+25°C - - 100 mV
IO = 5mA to 200mA, TJ =+25 °C- - 50
Quiescent Current IQTJ =+25°C-4.06.0mA
Quiescent Current Change ΔIQIO = 5mA to 350mA - - 0.5 mA
IO = 200mA
VI = 8V to 25V --0.8
Output Voltage Drift ΔV/ΔTIO = 5mA
TJ = 0 to +125°C--0.5-mV/°C
Output Noise Voltage VNf = 10Hz to 100kHz - 40 - μV/Vo
Ripple Rejection RR f = 120Hz, IO = 300mA
VI = 8V to 18V, TJ =+25 °C-80- dB
Dropout Voltage VDTJ =+25°C, IO = 500mA - 2 - V
Short Circuit Current ISC TJ =+25°C, VI = 35V - 300 - mA
Peak Current IPK TJ =+25°C - 700 - mA
MC78M05/LM78M05
3
Typical Applications
Figure 1. Fixed Output Regulator
Figure 2. Constant Current Regulator
Notes:
1. To specify an output voltage, substitute voltage value for "XX"
2. Although no output capacitor is needed for stability, it does improve transient response.
3. CI is required if regulator is located an appreciable distance from power Supply filter
Figure 3. Circuit for Increasing Output Voltage
0.1μF
CO
CI0.3μF
VO
VIMC78M05
LM78M05
13
2
0.1μF
CO
CI0.33μFIO
VIMC78M05
LM78M05
13
2VXX
IO
R1
IO = R1 +IO
Vxx
0.1μF
CO
CI0.33μFIO
VIMC78M05
LM78M05
13
2VXX
VO
R1
R2
IR1 ≥ 5IO
VO = VXX (1+R2/R1) +IOR2
MC78M05/LM78M05
4
Figure 4. Adjustable Output Regulator (7 to 30V)
Figure 5. 0.5 to 10V Regulator
0.1μF
CO
CI0.33μF
VO
VIMC78M05
LM78M05
13
2
10kΩ
3
2
4
7
6LM741
0.1μF
C2
C1
0.33μF
VO
VIMC78M05
LM78M05
13
2
10kΩ
3
2
4
7
6LM741 R3
R1
VXX R4
R5
910Ω
9.1kΩ
13V < VI < 25V
-7 < -VI < 17V
_
+VO = Vxx R1
R4
MC78M05/LM78M05
5
Mechanical Dimensions
Package Dimensions in millimeters
TO-220 [ SINGLE GAUGE ]
MC78M05/LM78M05
6
Mechanical Dimensions (Continued)
Package Dimensions in millimeters
6.60
±0.20
2.30
±0.1
0
0.50
±0.1
0
5.34
±0.30
0.70
±0.20
0.60
±0.20
0.80
±0.20
9.50
±0.30
6.10
±0.20
2.70
±0.20
9.50
±0.30
6.10
±0.20
2.70
±0.20
MIN0.55
0.76
±0.10
0.50
±0.1
0
1.02
±0.2
0
2.30
±0.2
0
6.60
±0.20
0.76
±0.10
(5.34)
(1.50)
(2XR0.25)
(5.04)
0.89
±0.10
(0.10) (3.05)
(1.00)
(0.90)
(0.70)
0.91
±0.10
2.30TYP
[2.30±0.20]
2.30TYP
[2.30±0.20]
MAX0.96
(4.34)(0.50) (0.50)
D-PAK
MC78M05/LM78M05
7
Ordering Information
Product Number Package Operating Temperature
LM78M05CT TO-220 (Single Gauge) 0 ~ +125°C
Product Number Package Operating Temperature
MC78M05CDT D-PAK 0 ~ +125°C
MC78M05/LM78M05
9/8/11 0.0m 001
Stock#DS400020
© 2011 Fairchild Semiconductor Corporation
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