©2002 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.5
Features
• Output Current up to 0.5A
• Output Voltages of 5, 6, 8, 12, 15, 18, 24V
• Thermal Overload Protection
• Short Circuit Protection
• Output Transistor Safe Operating Area (SOA)Protection
Description
The MC78MXX/LM78MXX 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
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 ERRORAMPLIFIER
THERMAL
PROTECTION
MC78MXX/LM78MXX
3-Terminal 0.5A Positive Voltage Regulator
MC78MXX/LM78MXX
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 to 18V)
(for VO = 24V)
VI
VI
35
40
V
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 VO
TJ = +25°C 4.8 5 5.2
VIO = 5mA to 350mA
VI = 7V to 20V
4.75 5 5.25
Line Regulation (Note3) ∆VO
IO = 200mA
TJ =+25°C
VI = 7V to 25V - - 100
mV
VI = 8V to 25V - - 50
Load Regulation (Note3) ∆VO
IO = 5mA to 0.5A, TJ =+25°C - - 100
mV
IO = 5mA to 200mA, TJ =+25 °C - - 50
Quiescent Current IQ TJ =+25°C - 4.0 6.0 mA
Quiescent Current Change ∆IQ
IO = 5mA to 350mA - - 0.5
mAIO = 200mA
VI = 8V to 25V
- - 0.8
Output Voltage Drift ∆V/∆T IO = 5mATJ = 0 to +125°C
- -0.5 - mV/°C
Output Noise Voltage VN f = 10Hz to 100kHz - 40 - µV/Vo
Ripple Rejection RR f = 120Hz, IO = 300mAVI = 8V to 18V, TJ =+25 °C
- 80 - dB
Dropout Voltage VD TJ =+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
MC78MXX/LM78MXX
3
Electrical Characteristics (MC78M06) (Continued)
(Refer to the test circuits, 0 < TJ < +125°C, IO=350mA, VI =11V, unless otherwise specified, CI=0.33µF, CO=0.1µF)
Note:
1. 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 Conditions Min. Typ. Max. Unit
Output Voltage VO
TJ = +25°C 5.75 6 6.25
VIO = 5mA to 350mA
VI = 8V to 21V
5.7 6 6.3
Line Regulation (Note1) ∆VO
IO = 200mA
TJ = +25°C
VI = 8V to 25V - - 100
mV
VI = 9V to 25V - - 50
Load Regulation (Note1) ∆VO
IO = 5mA to 0.5A, TJ = +25°C - - 120
mV
IO = 5mA to 200mA, TJ = +25°C - - 60
Quiescent Current IQ TJ = +25°C - 4.0 6.0 mA
Quiescent Current Change ∆IQ
IO = 5mA to 350mA - - 0.5
mAIO = 200mA
VI = 9V to 25V
- - 0.8
Output Voltage Drift ∆V/∆T IO = 5mATJ = 0 to +125°C
- -0.5 - mV/°C
Output Noise Voltage VN f = 10Hz to 100kHz - 45 - µV/Vo
Ripple Rejection RR f = 120Hz, IO = 300mAVI = 9V to 19V, TJ =+25 °C
- 80 - dB
Dropout Voltage VD TJ =+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
MC78MXX/LM78MXX
4
Electrical Characteristics (MC78M08) (Continued)
(Refer to the test circuits, 0 < TJ < +125°C, IO=350mA, VI=14V, unless otherwise specified, CI = 0.33µF, CO=0.1µF)
Note:
1. 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 Conditions Min. Typ. Max. Unit
Output Voltage VO
TJ =+25°C 7.7 8 8.3
VIO = 5mA to 350mA
VI = 10.5V to 23V
7.6 8 8.4
Line Regulation (Note1) ∆VO
IO = 200mA
TJ =+25°C
VI = 10.5V to 25V - - 100
mV
VI = 11V to 25V - - 50
Load Regulation (Note1) ∆VO
IO = 5mA to 0.5A, TJ =+25°C - - 160
mV
IO = 5mA to 200mA, TJ =+25°C - - 80
Quiescent Current IQ TJ = +25°C - 4.0 6.0 mA
Quiescent Current Change ∆IQ
IO = 5mA to 350mA - - 0.5
mAIO = 200mA
VI = 10.5V to 25V
- - 0.8
Output Voltage Drift RR IO = 5mATJ = 0 to +125°C
- −0.5 - mV/°C
Output Noise Voltage VN f = 10Hz to 100kHz - 52 - µV/Vo
Ripple Rejection RR f = 120Hz, IO = 300mAVI = 11.5V to 21.5V, TJ =+25 °C
- 80 - dB
Dropout Voltage VD TJ = +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
MC78MXX/LM78MXX
5
Electrical Characteristics (MC78M12) (Continued)
(Refer to the test circuits, 0 < TJ < +125°C, IO=350mA, VI=19V, unless otherwise specified, CI =0.33µF, CO=0.1µF)
Note:
1. 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 Conditions Min. Typ. Max. Unit
Output Voltage VO
TJ = +25°C 11.5 12 12.5
VIO = 5mA to 350mA
VI = 14.5V to 27V
11.4 12 12.6
Line Regulation (Note1) ∆VO
IO = 200mA
TJ = +25°C
VI = 14.5V to 30V - - 100
mV
VI = 16V to 30V - - 50
Load Regulation (Note1) ∆VO
IO = 5mA to 0.5A, TJ = +25°C - - 240
mV
IO = 5mA to 200mA, TJ = +25°C - - 120
Quiescent Current IQ TJ =+25°C - 4.1 6.0 mA
Quiescent Current Change ∆IQ
IO = 5mA to 350mA - - 0.5
mAIO = 200mA
VI = 14.5V to 30V
- - 0.8
Output Voltage Drift ∆V/∆T IO = 5mATJ = 0 to +125°C
- -0.5 - mV/°C
Output Noise Voltage VN f = 10Hz to 100kHz - 75 - µV/Vo
Ripple Rejection RR f = 120Hz, IO = 300mAVI = 15V to 25V, TJ =+25 °C
- 80 - dB
Dropout Voltage VD TJ =+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
MC78MXX/LM78MXX
6
Electrical Characteristics (MC78M15) (Continued)
(Refer to the test circuits, 0 < TJ < +125°C, IO=350mA, VI=23V, unless otherwise specified, CI =0.33µF, CO=0.1µF)
Note:
1. 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 Conditions Min. Typ. Max. Unit
Output Voltage VO
TJ = +25°C 14.4 15 15.6
VIO = 5mA to 350mA
VI = 17.5V to 30V
14.25 15 15.75
Line Regulation (Note1) ∆VO
IO = 200mA
TJ =+25°C
VI = 17.5V to 30V - - 100
mV
VI = 20V to 30V - - 50
Load Regulation (Note1) ∆VO
IO = 5mA to 0.5A, TJ =+25°C - - 300
mV
IO = 5mA to 200mA, TJ =+25°C - - 150
Quiescent Current IQ TJ = +25°C - 4.1 6.0 mA
Quiescent Current Change ∆IQ
IO = 5mA to 350mA - - 0.5
mAIO = 200mA
VI = 17.5V to 30V
- - 0.8
Output Voltage Drift ∆V/∆T IO = 5mATJ = 0 to +125°C
- -1 - mV/°C
Output Noise Voltage VN f = 10Hz to 100kHz - 100 - µV/Vo
Ripple Rejection RR f = 120Hz, IO = 300mAVI = 18.5V to 28.5V, TJ =+25 °C
- 70 - dB
Dropout Voltage VD TJ =+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
MC78MXX/LM78MXX
7
Electrical Characteristics (MC78M18) (Continued)
(Refer to the test circuits, 0 < TJ < +125°C, IO=350mA, VI=26V, unless otherwise specified, CI =0.33µF, CO=0.1µF)
Note:
1. 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 Conditions Min. Typ. Max. Unit
Output Voltage VO
TJ = +25°C 17.3 18 18.7
VIO = 5mA to 350mA
VI = 20.5V to 33V
17.1 18 18.9
Line Regulation (Note1) ∆VO
IO = 200mA
TJ = +25°C
VI = 21V to 33V - - 100
mV
VI = 24V to 33V - - 50
Load Regulation (Note1) ∆VΟ
IO = 5mA to 0.5A, TJ = +25°C - - 360
mV
IO = 5mA to 200mA, TJ = +25°C - - 180
Quiescent Current IQ TJ = +25°C - 4.2 6.0 mA
Quiescent Current Change ∆IQ
IO = 5mA to 350mA - - 0.5
mAIO = 200mA
VI = 21V to 33V
- - 0.8
Output Voltage Drift ∆V/∆T IO = 5mATJ = 0 to 125°C - -1.1 - mV/°C
Output Noise Voltage VN f = 10Hz to 100kHz - 100 - µV/Vo
Ripple Rejection RR f = 120Hz, IO= 300mA , VI = 22V to 32VTJ =+25 °C
- 70 - dB
Dropout Voltage VD TJ = +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
MC78MXX/LM78MXX
8
Electrical Characteristics (MC78M24) (Continued)
(Refer to the test circuits, 0 < TJ < +125°C, IO=350mA, VI=33V, unless otherwise specified, CI =0.33µF, CO=0.1µF)
Note:
1. 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 Conditions Min. Typ. Max. Unit
Output Voltage VO
TJ =+25°C 23 24 25
VIO = 5mA to 350mA
VI = 27V to 38V
22.8 24 25.2
Line Regulation (Note1) ∆VO
IO = 200mA
TJ =+25°C
VI = 27V to 38V - - 100
mV
VI = 28V to 38V - - 50
Load Regulation (Note1) ∆VO
IO = 5mA to 0.5A, TJ =+25°C - - 480
mV
IO = 5mA to 200mA, TJ =+25°C - - 240
Quiescent Current IQ TJ = +25°C - 4.2 6.0 mA
Quiescent Current Change ∆IQ
IO = 5mA to 350mA - - 0.5
mAIO = 200mA
VI = 27V to 38V
- - 0.8
Output Voltage Drift ∆V/∆T IO = 5mATJ = 0 to +125°C
- -1.2 - mV/°C
Output Noise Voltage VN f = 10Hz to 100kHz - 170 - µV/Vo
Ripple Rejection RR f = 120Hz, IO = 300mAVI = 28V to 38V, TJ =+25 °C
- 70 - dB
Dropout Voltage VD TJ = +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
MC78MXX/LM78MXX
9
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
0.1µFCOCI
0.3µF
VOVI MC78MXXLM78MXX
1 3
2
0.1µF
COCI
0.33µF
IO
VI MC78MXXLM78MXX
1 3
2
VXX
IO
R1
IO = R1 +IO
Vxx
0.1µF
COCI
0.33µF
IO
VI MC78MXXLM78MXX
1 3
2 VXX
VO
R1
R2IR1 ≥ 5IO
VO = VXX (1+R2/R1) +IOR2
MC78MXX/LM78MXX
10
Figure 4. Adjustable Output Regulator (7 to 30V)
Figure 5. 0.5 to 10V Regulator
0.1µF
COCI
0.33µF
VOVI MC78M05LM78M05
1 3
2
10kΩ3
2
4
7
6 LM741
0.1µF
C2
C1
0.33µF
VOVI MC78M05LM78M05
1 3
2
10kΩ
3
2
4
7
6
LM741
R3
R1
VXX
R4
R5
910Ω
9.1kΩ
13V < VI < 25V
-7 < -VI < 17V
_
+ VO = Vxx R1
R4
MC78MXX/LM78MXX
11
Mechanical Dimensions
Package
Dimensions in millimeters
4.50 ±0.209.90 ±0.20
1.52 ±0.10
0.80 ±0.10
2.40 ±0.20
10.00 ±0.20
1.27 ±0.10
ø3.60 ±0.10
(8.70)
2.
80
±0
.1
0
15
.9
0
±0
.2
0
10
.0
8
±0
.3
0
18
.9
5M
AX
.
(1.
70
)
(3.
70
)
(3.
00
)
(1.
46
)
(1.
00
)
(45
°)
9.
20
±0
.2
0
13
.0
8
±0
.2
0
1.
30
±0
.1
0
1.30 +0.10
–0.05
0.50 +0.10
–0.05
2.54TYP
[2.54 ±0.20]
2.54TYP
[2.54 ±0.20]
TO-220
MC78MXX/LM78MXX
12
Mechanical Dimensions (Continued)
Package
Dimensions in millimeters
6.60 ±0.20
2.30 ±0.10
0.50 ±0.10
5.34 ±0.30
0.
70
±0
.2
0
0.
60
±0
.2
0
0.
80
±0
.2
0
9.
50
±0
.3
0
6.
10
±0
.2
0
2.
70
±0
.2
0
9.
50
±0
.3
0
6.
10
±0
.2
0
2.
70
±0
.2
0
M
IN
0.
55
0.76 ±0.10 0.50 ±0.10
1.02 ±0.20
2.30 ±0.20
6.60 ±0.20
0.76 ±0.10
(5.34)
(1.50)
(2XR0.25)
(5.04)
0.
89
±0
.1
0
(0.
10
)
(3.
05
)
(1.
00
)
(0.
90
)
(0.
70
)
0.
91
±0
.1
0
2.30TYP
[2.30±0.20]
2.30TYP
[2.30±0.20]
MAX0.96
(4.34)(0.50) (0.50)
D-PAK
MC78MXX/LM78MXX
13
Ordering Information
Product Number Package Operating Temperature
LM78M05CT TO-220 0 ~ +125°C
Product Number Package Operating Temperature
MC78M05CT
TO-220
0 ~ +125°C
MC78M06CT
MC78M08CT
MC78M12CT
MC78M15CT
MC78M18CT
MC78M24CT
MC78M05CDT
D-PAK
MC78M06CDT
MC78M08CDT
MC78M12CDT
MC78MXX/LM78MXX
11/12/02 0.0m 001
Stock#DSxxxxxxxx
2002 Fairchild Semiconductor Corporation
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FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES
OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR
CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body,
or (b) support or sustain life, and (c) whose failure to
perform when properly used in accordance with
instructions for use provided in the labeling, can be
reasonably expected to result in a significant injury of the
user.
2. A critical component in any component of a life support
device or system whose failure to perform can be
reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
www.fairchildsemi.com
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY
PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY
LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER
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