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www.fairchildsemi.com
LM78MXX
3-Terminal 0.5A Positive Voltage Regulator
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 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
GND
1
D-PAK
GND
1
1. Input 2. GND 3. Output
Internal Block Digram
INPUT
1
SERIES
PASS
ELEMENT
OUTPUT
3
CURRENT
GENERATOR
SOA
PROTECTION
R1
STARTING
CIRCUIT
REFERENCE
VOLTAGE
ERROR
AMPLIFIER
R2
THERMAL
PROTECTION
GND
2
Rev. 1.0
©2008 Fairchild Semiconductor Corporation
LM78MXX
Absolute Maximum Ratings
Parameter
Input Voltage (for V
O
= 5V to 18V)
(for V
O
= 24V)
Thermal Resistance Junction-Case (Note1)
TO-220 (Tc = +25°C)
Thermal Resistance Junction-Air (Note1, 2)
TO-220 (Ta = +25°C)
D-PAK (Ta = +25°C)
Operating Junction Temperature Range
Storage Temperature Range
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
Symbol
V
I
V
I
R
θJC
R
θJA
T
OPR
T
STG
Value
35
40
2.5
66
92
0 ~ +150
-65 ~ +150
Unit
V
V
°C/W
°C/W
°C
°C
Electrical Characteristics (LM78M05)
(Refer to the test circuits, 0
<
T
J
<
+125°C, I
O
=350mA, V
I
=10V, unless otherwise specified, C
I
= 0.33µF, C
O
=0.1µF)
Parameter
Output Voltage
Symbol
V
O
Conditions
T
J
= +25°C
I
O
= 5mA to 350mA
V
I
= 7V to 20V
I
O
= 200mA
T
J
=+25°C
V
I
= 7V to 25V
V
I
= 8V to 25V
Min.
4.8
4.75
-
-
-
-
-
-
-
-
-
-
-
-
-
Typ.
5
5
-
-
-
-
4.0
-
-
-0.5
40
80
2
300
700
Max.
5.2
5.25
100
50
100
50
6.0
0.5
0.8
-
-
-
-
-
-
mA
V
Unit
Line Regulation (Note3)
Load Regulation (Note3)
Quiescent Current
Quiescent Current Change
∆V
O
∆V
O
I
Q
∆I
Q
∆V/∆T
V
N
RR
V
D
I
SC
I
PK
mV
mV
mA
I
O
= 5mA to 0.5A, T
J
=+25°C
I
O
= 5mA to 200mA, T
J
=+25
°C
T
J
=+25°C
I
O
= 5mA to 350mA
I
O
= 200mA
V
I
= 8V to 25V
I
O
= 5mA
T
J
= 0 to +125°C
f = 10Hz to 100kHz
f = 120Hz, I
O
= 300mA
V
I
= 8V to 18V, T
J
=+25
°C
T
J
=+25°C, I
O
= 500mA
T
J
=+25°C, V
I
= 35V
T
J
=+25°C
Output Voltage Drift
Output Noise Voltage
Ripple Rejection
Dropout Voltage
Short Circuit Current
Peak Current
mV/°C
µ
V/Vo
dB
V
mA
mA
Note:
3. Load and line regulation are specified at constant junction temperature. Change in V
o
due to heating effects must be taken
into account separately. Pulse testing with low duty is used.
2
LM78MXX
Electrical Characteristics (LM78M06)
(Continued)
(Refer to the test circuits, 0
<
T
J
<
+125°C, I
O
=350mA, V
I
=11V, unless otherwise specified, C
I
=0.33µF, C
O
=0.1µF)
Parameter
Output Voltage
Symbol
V
O
Conditions
T
J
= +25°C
I
O
= 5mA to 350mA
V
I
= 8V to 21V
I
O
= 200mA
T
J
= +25°C
V
I
= 8V to 25V
V
I
= 9V to 25V
Min.
5.75
5.7
-
-
-
-
-
-
-
-
-
-
-
-
-
Typ.
6
6
-
-
-
-
4.0
-
-
-0.5
45
80
2
300
700
Max.
6.25
6.3
100
50
120
60
6.0
0.5
0.8
-
-
-
-
-
-
mA
V
Unit
Line Regulation (Note1)
Load Regulation (Note1)
Quiescent Current
Quiescent Current Change
∆V
O
∆V
O
I
Q
∆I
Q
∆V/∆T
V
N
RR
V
D
I
SC
I
PK
mV
mV
mA
I
O
= 5mA to 0.5A, T
J
= +25°C
I
O
= 5mA to 200mA, T
J
= +25°C
T
J
= +25°C
I
O
= 5mA to 350mA
I
O
= 200mA
V
I
= 9V to 25V
I
O
= 5mA
T
J
= 0 to +125°C
f = 10Hz to 100kHz
f = 120Hz, I
O
= 300mA
V
I
= 9V to 19V, T
J
=+25
°C
T
J
=+25°C, I
O
= 500mA
T
J
= +25°C, V
I
= 35V
T
J
=+25°C
Output Voltage Drift
Output Noise Voltage
Ripple Rejection
Dropout Voltage
Short Circuit Current
Peak Current
mV/°C
µ
V/Vo
dB
V
mA
mA
Note:
1. Load and line regulation are specified at constant junction temperature. Change in V
o
due to heating effects must be taken
into account separately. Pulse testing with low duty is used.
3
LM78MXX
Electrical Characteristics (LM78M08)
(Continued)
(Refer to the test circuits, 0
<
T
J
<
+125°C, I
O
=350mA, V
I
=14V, unless otherwise specified, C
I
= 0.33µF, C
O
=0.1µF)
Parameter
Output Voltage
Symbol
T
J
=+25°C
V
O
I
O
= 5mA to 350mA
V
I
= 10.5V to 23V
I
O
= 200mA
T
J
=+25°C
V
I
= 10.5V to 25V
V
I
= 11V to 25V
Conditions
Min.
7.7
7.6
-
-
-
-
-
-
-
-
-
-
-
-
-
Typ.
8
8
-
-
-
-
4.0
-
-
−0.5
52
80
2
300
700
Max.
8.3
8.4
100
50
160
80
6.0
0.5
0.8
-
-
-
-
-
-
mA
V
Unit
Line Regulation (Note1)
Load Regulation (Note1)
Quiescent Current
Quiescent Current Change
∆V
O
∆V
O
I
Q
∆I
Q
mV
mV
mA
I
O
= 5mA to 0.5A, T
J
=+25°C
I
O
= 5mA to 200mA, T
J
=+25°C
T
J
= +25°C
I
O
= 5mA to 350mA
I
O
= 200mA
V
I
= 10.5V to 25V
I
O
= 5mA
T
J
= 0 to +125°C
f = 10Hz to 100kHz
f = 120Hz, I
O
= 300mA
V
I
= 11.5V to 21.5V, T
J
=+25
°C
T
J
= +25°C, I
O
= 500mA
T
J
= +25°C, V
I
= 35V
T
J
= +25°C
Output Voltage Drift
Output Noise Voltage
Ripple Rejection
Dropout Voltage
Short Circuit Current
Peak Current
RR
V
N
RR
V
D
I
SC
I
PK
mV/°C
µ
V/Vo
dB
V
mA
mA
Note:
1. Load and line regulation are specified at constant junction temperature. Change in V
O
due to heating effects must be taken
into account separately. Pulse testing with low duty is used.
4
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