©2008 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0
Features
• Output Current up to 0.5A
• Output Voltages of 5, 6, 8, 12, 15, 18, 24V
• Thermal Overload Protectio n
• Short Circuit Protection
• Output Transist or Safe O perati ng Are a (SOA)Protection
Description
The LM78MXX series of thre e-terminal positive regulators are
available in the TO-220/D-PAK package with seve ral fixed output
voltages making it useful in a wide range of applications.
TO-220
D-PAK
1. Input 2. GND 3. Outpu t
1
1
GND
GND
Internal Block Digr am
OUTPUT
3
R1
R2
GND
2
1
INPUT SERIES
PASS
ELEMENT
SOA
PROTECTION
CURRENT
GENERATOR
STARTING
CIRCUIT REFERENCE
VOLTAGE ERROR
AMPLIFIER
THERMAL
PROTECTION
LM78MXX
3-Terminal 0.5A Positive Volta ge Regulator
LM78MXX
2
Absolute Maximum Ratings
Note:
1. Thermal resistance test board
Size: 76.2mm * 114.3mm * 1.6mm( 1S0P)
JED E C stan dard: JESD51-3, JESD51-7
2. Assume no ambient airflow
Electrical Characteristics (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
VI35
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 VOTJ = +25°C 4.855.2 V
IO = 5mA to 350mA
VI = 7V to 20V 4.75 5 5.25
Line Regulation (Note3) ∆VOIO = 200mA
TJ =+25°CVI = 7V to 25V - - 100 mV
VI = 8V to 25V - - 50
Load Regulation (Note3) ∆VOIO = 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 ∆IQIO = 5mA to 350mA - - 0.5 mA
IO = 200mA
VI = 8V to 25V --0.8
Output Voltage Drift ∆V/∆TIO = 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
LM78MXX
3
Electrical Characteristics (LM78M06) (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 VOTJ = +25°C 5.75 6 6.25 V
IO = 5mA to 350mA
VI = 8V to 21V 5.7 6 6.3
Line Regulation (Note1) ∆VOIO = 200mA
TJ = +25°CVI = 8V to 25V - - 100 mV
VI = 9V to 25V - - 50
Load Regulation (Note1) ∆VOIO = 5mA to 0.5A, TJ = +25°C - - 120 mV
IO = 5mA to 200mA, TJ = +25°C- -60
Quiescent Current IQTJ = +25°C-4.06.0mA
Quiescent Current Change ∆IQIO = 5mA to 350mA - - 0.5 mA
IO = 200mA
VI = 9V to 25V --0.8
Output Voltage Drift ∆V/∆TIO = 5mA
TJ = 0 to +125°C--0.5-mV/°C
Output Noise Voltage VNf = 10Hz to 100kHz - 45 - µV/Vo
Ripple Rejection RR f = 120Hz, IO = 300mA
VI = 9V to 19V, 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
LM78MXX
4
Electrical Characteristics (LM78M08) (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 VOTJ =+25°C7.788.3
V
IO = 5mA to 350mA
VI = 10.5V to 23V 7.6 8 8.4
Line Regulation (Note1) ∆VOIO = 200mA
TJ =+25°CVI = 10.5V to 25V - - 100 mV
VI = 11V to 25V - - 50
Load Regulation (Note1) ∆VOIO = 5mA to 0.5A, TJ =+25°C - - 160 mV
IO = 5mA to 200mA, TJ =+25°C--80
Quiescent Current IQTJ = +25°C-4.06.0mA
Quiescent Current Change ∆IQIO = 5mA to 350mA - - 0.5 mA
IO = 200mA
VI = 10.5V to 25V --0.8
Output Voltage Drift RR IO = 5mA
TJ = 0 to +125°C-−0.5 - mV/°C
Output Noise Voltage VNf = 10Hz to 100kHz - 52 - µV/Vo
Ripple Rejection RR f = 120Hz, IO = 300mA
VI = 11.5V to 21.5V, 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
LM78MXX
5
Electrical Characteristics (LM78M12) (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 VOTJ = +25°C 11.5 12 12.5 V
IO = 5mA to 350mA
VI = 14.5V to 27V 11.4 12 12.6
Line Regulation (Note1) ∆VOIO = 200mA
TJ = +25°CVI = 14.5V to 30V - - 100 mV
VI = 16V to 30V - - 50
Load Regulation (Note1) ∆VOIO = 5mA to 0.5A, TJ = +25°C - - 240 mV
IO = 5mA to 200mA, TJ = +25°C - - 120
Quiescent Current I QTJ =+25°C-4.16.0mA
Quiescent Current Change ∆IQIO = 5mA to 350mA - - 0.5 mA
IO = 200mA
VI = 14.5V to 30V --0.8
Output Voltage Drift ∆V/∆TIO = 5mA
TJ = 0 to +125°C--0.5-mV/°C
Output Noise Voltage VNf = 10Hz to 100kHz - 75 - µV/Vo
Ripple Rejection RR f = 120Hz, IO = 300mA
VI = 15V to 25V, 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
LM78MXX
6
Electrical Characteristics (LM78M15) (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 VOTJ = +25°C 14.4 15 15.6 V
IO = 5mA to 350mA
VI = 17.5V to 30V 14.25 15 15.75
Line Regulation (Note1) ∆VOIO = 200mA
TJ =+25°CVI = 17.5V to 30V - - 100 mV
VI = 20V to 30V - - 50
Load Regulation (Note1) ∆VOIO = 5mA to 0.5A, TJ =+25°C - - 300 mV
IO = 5mA to 200mA, TJ =+25°C - - 150
Quiescent Current IQTJ = +25°C-4.16.0mA
Quiescent Current Change ∆IQIO = 5mA to 350mA - - 0.5 mA
IO = 200mA
VI = 17.5V to 30V --0.8
Output Voltage Drift ∆V/∆TIO = 5mA
TJ = 0 to +125°C--1 -mV/°C
Output Noise Voltage VNf = 10Hz to 100kHz - 100 - µV/Vo
Ripple Rejection RR f = 120Hz, IO = 300mA
VI = 18.5V to 28.5V, TJ =+25 °C-70 - 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
LM78MXX
7
Electrical Characteristics (LM78M18) (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 VOTJ = +25°C 17.3 18 18.7 V
IO = 5mA to 350mA
VI = 20.5V to 33V 17.1 18 18.9
Line Regulation (Note1) ∆VOIO = 200mA
TJ = +25°CVI = 21V to 33V - - 100 mV
VI = 24V to 33V - - 50
Load Regulation (Note1) ∆VΟIO = 5mA to 0.5A, TJ = +25°C - - 360 mV
IO = 5mA to 200mA, TJ = +25°C - - 180
Quiescent Current IQTJ = +25°C-4.26.0mA
Quiescent Current Change ∆IQIO = 5mA to 350mA - - 0.5 mA
IO = 200mA
VI = 21V to 33V --0.8
Output Voltage Drift ∆V/∆TI
O = 5mATJ = 0 to 125°C--1.1-mV/°C
Output Noise Voltage VNf = 10Hz to 100kHz - 100 - µV/Vo
Ripple Rejection RR f = 120Hz, IO= 300mA , VI = 22V to 32V
TJ =+25 °C-70- 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
LM78MXX
8
Electrical Characteristics (LM78M24) (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 VOTJ =+25°C232425
V
IO = 5mA to 350mA
VI = 27V to 38V 22.8 24 25.2
Line Regulation (Note1) ∆VOIO = 200mA
TJ =+25°CVI = 27V to 38V - - 100 mV
VI = 28V to 38V - - 50
Load Regulation (Note1) ∆VOIO = 5mA to 0.5A, TJ =+25°C - - 480 mV
IO = 5mA to 200mA, TJ =+25°C - - 240
Quiescent Current IQTJ = +25°C-4.26.0mA
Quiescent Current Change ∆IQIO = 5mA to 350mA - - 0.5 mA
IO = 200mA
VI = 27V to 38V --0.8
Output Voltage Drift ∆V/∆TIO = 5mA
TJ = 0 to +125°C--1.2-mV/°C
Output Noise Voltage VNf = 10Hz to 100kHz - 170 - µV/Vo
Ripple Rejection RR f = 120Hz, IO = 300mA
VI = 28V to 38V, TJ =+25 °C-70- 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
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 f or Increasing Output Voltage
0.1µF
CO
CI0.3µF
VO
VI
LM78MXX
13
2
0.1µF
CO
CI0.33µFIO
VI
LM78MXX
13
2VXX
IO
R1
IO = R1 +IO
Vxx
0.1µF
CO
CI0.33µFIO
VI
LM78MXX
13
2VXX
VO
R1
R2
IR1 ≥ 5IO
VO = VXX (1+R2/R1) +IOR2
LM78MXX
10
Figure 4. Adjustable Output Regulator (7 to 30V)
Figure 5. 0.5 to 10V Regulator
0.1µF
CO
CI0.33µF
VO
VI
LM78M05
13
2
10kΩ
3
2
4
7
6LM741
0.1µF
C2
C1
0.33µF
VO
VI
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
LM78MXX
11
Mechanical Dimensions
Package Dimensions in millimeters
4.50 ±0.20
9.90 ±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 ±0.1015.90 ±0.20
10.08 ±0.30 18.95MAX.
(1.70)
(3.70)(3.00)
(1.46)
(1.00)
(45°)
9.20 ±0.2013.08 ±0.20
1.30 ±0.10
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
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 ±0.20
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 ±0.10
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 ±0.10
(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
LM78MXX
13
Ordering Information
Product Number Package Operating Temperature
LM78M05CT
TO-220
0 ~ +125°CL
LM78M06CT
LM78M08CT
LM78M12CT
LM78M15CT
LM78M18CT
LM78M24CT
LM78M05CDT
D-PAK
LM78M06CDT
LM78M08CDT
LM78M12CDT
LM78MXX
11/12/02 0.0m 001
Stock#DSxxxxxxxx
2008 Fairchild Semicond uctor Corporation
LIFE SU PP ORT POL ICY
FAIRCHILD’S PRODUCT S ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS I N LIFE SUPPORT DEVICES
OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR
CORPORA TION. As used he rein :
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 failur e to pe rform can be
reasonably expected to cause the failure of the life support
device or system, or to affe ct its safety or effec t iv ene ss .
www.fairchildsemi.com
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESE RVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY
PRO DUCTS HEREIN TO IM PROVE REL IABILITY, FUNCTION OR D ESIGN. FAIRCHILD DOES NOT ASSUME ANY
LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER
DOES IT CONVEY ANY LICENSE UNDER I TS PATENT RIGHTS, NOR THE RI GHTS OF OT HERS.
