L78M00AB/AC
SERIES
March1997
PRECISION 500mA REGULATORS
.OUTPUT CURRENT UP TO 0.5A
.OUTPUTVOLTAGES OF 5; 6; 8; 9: 10; 12; 15;
18; 20;24V
.THERMALOVERLOAD PROTECTION
.SHORT CIRCUIT PROTECTION
.OUTPUTTRANSISTORS SOAPROTECTION
.±2% OUTPUTVOLTAGE TOLERANCE
.GUARANTEED IN EXTENDED TEMPERA-
TURERANGES
DESCRIPTION
The L78M00AB series of three-therminal positive
regulators is available in TO-220 and DPAK
packages and with several fixed output voltages,
making it useful in a wide range of applications.
These regulators can provide local on-card
regulation eliminating the distribution problems
associated with single point regulation. Each type
employsinternal current limiting, thermalshut-down
and safe area protection, making it essentially
indestructible. If adequate heat sinking is provided,
they can deliver over 0.5A output current. Although
designed primarily asfixedvoltageregulators,these
devices can be used with external components to
obtainadjustable voltages and currents.
TO-220
BLOCK DIAGRAM
13
DPAK
(TO-252)
1/15
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
ViDC Input Voltage (for Vo= 5 to 18V)
(for Vo= 20, 24V) 35
40 V
V
IoOutput Current Internally Limited
Ptot Power Dissipation Internally Limited
Tstg Storage Temperature -65 to 150 oC
TjOperating Junction Temperature for L78M00AC
L78M00AB 0 to 125
-40 to 125
oC
oC
THERMAL DATA
TO-220 DPAK
Rthj-case
Rthj-amb Thermal Resistance Junction-case MAX
Thermal Resistance Junction-ambient MAX 3
50 8
100
oC/W
oC/W
CONNECTION DIAGRAM AND ORDER CODES (top view)
Order Codes Output Voltage
0 to 125 oC -40 to 125 oC
DPAK TO-220 DPAK
L78M05ACDT L78M05ABV L78M05ABDT 5V
L78M06ACDT L78M06ABV L78M06ABDT 6V
L78M08ACDT L78M08ABV L78M08ABDT 8V
L78M09ACDT L78M09ABV L78M09ABDT 9V
L78M10ACDT L78M10ABV L78M10ABDT 10V
L78M12ACDT L78M12ABV L78M12ABDT 12V
L78M15ACDT L78M15ABV L78M15ABDT 15V
L78M18ACDT L78M18ABV L78M18ABDT 18V
L78M20ACDT L78M20ABV L78M20ABDT 20V
L78M24ACDT L78M24ABV L78M24ABDT 24V
TO-220 DPAK
L78M00AB/AC SERIES
2/15
APPLICATION CIRCUIT
SCHEMATIC DIAGRAM
L78M00AB/AC SERIES
3/15
TEST CIRCUITS
Figure 1 : DC Parameters. Figure 2 : Load Regulation.
Figure 3 : RippleRejection.
L78M00AB/AC SERIES
4/15
ELECTRICAL CHARACTERISTICS FOR L78M05XX (refer to the test circuits, Vi= 10V, Io= 350 mA,
Ci= 0.33 µF, Co= 0.1 µF, Tj= -40 to 125 oC (AB), Tj= 0 to 125 oC (AC) unless otherwise specified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VoOutput Voltage Tj=25o
C 4.9 5 5.1 V
VoOutput Voltage Io= 5 mA to 350 mA
Vi= 7 to 20 V 4.8 5 5.2 V
∆VoLine Regulation Io= 200 mA Tj=25o
C
V
i= 7 to 25 V
Vi= 8 to 25 V 100
30 mV
mV
∆VoLoad Regulation Io= 5 to 500 mA Tj=25o
C
I
o= 5 to 200 mA Tj=25o
C100
50 mV
mV
IdQuiescent Current Tj=25o
C6mA
∆I
d
Quiescent Current Change Io= 5 to 350 mA 0.5 mA
∆IdQuiescent Current Change Io = 200 mA Vi= 8 to 25 V 0.8 mA
∆
V
o
∆
T
Output Voltage Drift Io= 5 mA -0.5 mV/oC
eNOutput Noise Voltage B = 10Hz to 100KHz Tj=25o
C40µV
SVR Supply Voltage Rejection Io = 300 mA f = 120 Hz Tj=25o
C
V
i= 8 to 18 V 62 dB
VdDropout Voltage Tj=25o
C2V
I
sc Short Circuit Current Tj=25o
CV
i
= 35 V 300 mA
Iscp Short Circuit Peack Current Tj=25o
C 700 mA
ELECTRICAL CHARACTERISTICS FOR L78M06XX (refer to the test circuits, Vi= 11V, Io= 350 mA,
Ci= 0.33 µF, Co= 0.1 µF, Tj= -40 to 125 oC (AB), Tj= 0 to 125 oC (AC) unless otherwise specified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VoOutput Voltage Tj=25o
C 5.88 6 6.12 V
VoOutput Voltage Io= 5 mA to 350 mA
Vi= 8 to 21 V 5.75 6 6.3 V
∆VoLine Regulation Io= 200 mA Tj=25o
C
V
i= 8 to 25 V
Vi= 9 to 25 V 100
30 mV
mV
∆VoLoad Regulation Io= 5 to 500 mA Tj=25o
C
I
o= 5 to 200 mA Tj=25o
C120
60 mV
mV
IdQuiescent Current Tj=25o
C6mA
∆I
d
Quiescent Current Change Io= 5 to 350 mA 0.5 mA
∆IdQuiescent Current Change Io = 200 mA Vi= 9 to 25 V 0.8 mA
∆
V
o
∆
T
Output Voltage Drift Io= 5 mA -0.5 mV/oC
eNOutput Noise Voltage B = 10Hz to 100KHz Tj=25o
C45µV
SVR Supply Voltage Rejection Io = 300 mA f = 120 Hz Tj=25o
C
V
i= 9 to 19 V 59 dB
VdDropout Voltage Tj=25o
C2V
I
sc Short Circuit Current Tj=25o
CV
i
= 35 V 270 mA
Iscp Short Circuit Peack Current Tj=25o
C 700 mA
L78M00AB/AC SERIES
5/15
ELECTRICAL CHARACTERISTICS FOR L78M08XX (refer to the test circuits, Vi= 14V, Io= 350 mA,
Ci= 0.33 µF, Co= 0.1 µF, Tj= -40 to 125 oC (AB), Tj= 0 to 125 oC (AC) unless otherwise specified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VoOutput Voltage Tj=25o
C 7.84 8 8.16 V
VoOutput Voltage Io= 5 mA to 350 mA
Vi= 10.5 to 23 V 7.7 8 8.3 V
∆VoLine Regulation Io= 200 mA Tj=25o
C
V
i= 10.5 to 25 V
Vi=11to25V 100
30 mV
mV
∆VoLoad Regulation Io= 5 to 500 mA Tj=25o
C
I
o= 5 to 200 mA Tj=25o
C160
80 mV
mV
IdQuiescent Current Tj=25o
C6mA
∆I
d
Quiescent Current Change Io= 5 to 350 mA 0.5 mA
∆IdQuiescent Current Change Io = 200 mA Vi= 10.5 to 25 V 0.8 mA
∆
V
o
∆
T
Output Voltage Drift Io= 5 mA -0.5 mV/oC
eNOutput Noise Voltage B = 10Hz to 100KHz Tj=25o
C52µV
SVR Supply Voltage Rejection Io = 300 mA f = 120 Hz Tj=25o
C
V
i= 11.5 to 21.5 V 56 dB
VdDropout Voltage Tj=25o
C2V
I
sc Short Circuit Current Tj=25o
CV
i
= 35 V 250 mA
Iscp Short Circuit Peack Current Tj=25o
C 700 mA
ELECTRICAL CHARACTERISTICS FOR L78M09XX (refer to the test circuits, Vi= 15V, Io= 350 mA,
Ci= 0.33 µF, Co= 0.1 µF, Tj= -40 to 125 oC (AB), Tj= 0 to 125 oC (AC) unless otherwise specified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VoOutput Voltage Tj=25o
C 8.82 9 9.18 V
VoOutput Voltage Io= 5 mA to 350 mA
Vi= 11.5 to 24 V 8.64 9 9.36 V
∆VoLine Regulation Io= 200 mA Tj=25o
C
V
i= 11.5 to 25 V
Vi=12to25V 100
30 mV
mV
∆VoLoad Regulation Io= 5 to 500 mA Tj=25o
C
I
o= 5 to 200 mA Tj=25o
C180
90 mV
mV
IdQuiescent Current Tj=25o
C6mA
∆I
d
Quiescent Current Change Io= 5 to 350 mA 0.5 mA
∆IdQuiescent Current Change Io = 200 mA Vi= 11.5 to 25 V 0.8 mA
∆
V
o
∆
T
Output Voltage Drift Io= 5 mA -0.5 mV/oC
eNOutput Noise Voltage B = 10Hz to 100KHz Tj=25o
C52µV
SVR Supply Voltage Rejection Io = 300 mA f = 120 Hz Tj=25o
C
V
i= 12.5 to 23 V 56 dB
VdDropout Voltage Tj=25o
C2V
I
sc Short Circuit Current Tj=25o
CV
i
= 35 V 250 mA
Iscp Short Circuit Peack Current Tj=25o
C 700 mA
L78M00AB/AC SERIES
6/15
ELECTRICAL CHARACTERISTICS FOR L78M10XX (refer to the test circuits, Vi= 16V, Io= 350 mA,
Ci= 0.33 µF, Co= 0.1 µF, Tj= -40 to 125 oC (AB), Tj= 0 to 125 oC (AC) unless otherwise specified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VoOutput Voltage Tj=25o
C 9.8 10 10.2 V
VoOutput Voltage Io= 5 mA to 350 mA
Vi= 12.5 to 25 V 9.6 10 10.4 V
∆VoLine Regulation Io= 200 mA Tj=25o
C
V
i= 12.5 to 30 V
Vi=13to30V 100
30 mV
mV
∆VoLoad Regulation Io= 5 to 500 mA Tj=25o
C
I
o= 5 to 200 mA Tj=25o
C200
100 mV
mV
IdQuiescent Current Tj=25o
C6mA
∆I
d
Quiescent Current Change Io= 5 to 350 mA 0.5 mA
∆IdQuiescent Current Change Io = 200 mA Vi= 12.5 to 30 V 0.8 mA
∆
V
o
∆
T
Output Voltage Drift Io= 5 mA -0.5 mV/oC
eNOutput Noise Voltage B = 10Hz to 100KHz Tj=25o
C64µV
SVR Supply Voltage Rejection Io = 300 mA f = 120 Hz Tj=25o
C
V
i= 13.5 to 24 V 56 dB
VdDropout Voltage Tj=25o
C2V
I
sc Short Circuit Current Tj=25o
CV
i
= 35 V 245 mA
Iscp Short Circuit Peack Current Tj=25o
C 700 mA
ELECTRICAL CHARACTERISTICS FOR L78M12XX (refer to the test circuits, Vi= 19V, Io= 350 mA,
Ci= 0.33 µF, Co= 0.1 µF, Tj= -40 to 125 oC (AB), Tj= 0 to 125 oC (AC) unless otherwise specified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VoOutput Voltage Tj=25o
C 11.75 12 12.25 V
VoOutput Voltage Io= 5 mA to 350 mA
Vi= 14.5 to 27 V 11.5 12 12.5 V
∆VoLine Regulation Io= 200 mA Tj=25o
C
V
i= 14.5 to 30 V
Vi=16to30V 100
30 mV
mV
∆VoLoad Regulation Io= 5 to 500 mA Tj=25o
C
I
o= 5 to 200 mA Tj=25o
C240
120 mV
mV
IdQuiescent Current Tj=25o
C6mA
∆I
d
Quiescent Current Change Io= 5 to 350 mA 0.5 mA
∆IdQuiescent Current Change Io = 200 mA Vi= 14.5 to 30 V 0.8 mA
∆
V
o
∆
T
Output Voltage Drift Io= 5 mA -1 mV/oC
eNOutput Noise Voltage B = 10Hz to 100KHz Tj=25o
C75µV
SVR Supply Voltage Rejection Io = 300 mA f = 120 Hz Tj=25o
C
V
i=15to25V 55 dB
VdDropout Voltage Tj=25o
C2V
I
sc Short Circuit Current Tj=25o
CV
i
= 35 V 240 mA
Iscp Short Circuit Peack Current Tj=25o
C 700 mA
L78M00AB/AC SERIES
7/15
ELECTRICAL CHARACTERISTICS FOR L78M15XX (refer to the test circuits, Vi= 23V, Io= 350 mA,
Ci= 0.33 µF, Co= 0.1 µF, Tj= -40 to 125 oC (AB), Tj= 0 to 125 oC (AC) unless otherwise specified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VoOutput Voltage Tj=25o
C 14.7 15 15.3 V
VoOutput Voltage Io= 5 mA to 350 mA
Vi=17to30V 14.4 15 15.6 V
∆VoLine Regulation Io= 200 mA Tj=25o
C
V
i= 17.5 to 30 V
Vi=20to30V 100
30 mV
mV
∆VoLoad Regulation Io= 5 to 500 mA Tj=25o
C
I
o= 5 to 200 mA Tj=25o
C300
150 mV
mV
IdQuiescent Current Tj=25o
C6mA
∆I
d
Quiescent Current Change Io= 5 to 350 mA 0.5 mA
∆IdQuiescent Current Change Io = 200 mA Vi= 17.5 to 30 V 0.8 mA
∆
V
o
∆
T
Output Voltage Drift Io= 5 mA -1 mV/oC
eNOutput Noise Voltage B = 10Hz to 100KHz Tj=25o
C90µV
SVR Supply Voltage Rejection Io = 300 mA f = 120 Hz Tj=25o
C
V
i= 18.5 to 28.5 V 54 dB
VdDropout Voltage Tj=25o
C2V
I
sc Short Circuit Current Tj=25o
CV
i
= 35 V 240 mA
Iscp Short Circuit Peack Current Tj=25o
C 700 mA
ELECTRICAL CHARACTERISTICS FOR L78M18XX (refer to the test circuits, Vi= 26V, Io= 350 mA,
Ci= 0.33 µF, Co= 0.1 µF, Tj= -40 to 125 oC (AB), Tj= 0 to 125 oC (AC) unless otherwise specified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VoOutput Voltage Tj=25o
C 17.64 18 18.36 V
VoOutput Voltage Io= 5 mA to 350 mA
Vi= 20.5 to 33 V 17.3 18 18.7 V
∆VoLine Regulation Io= 200 mA Tj=25o
C
V
i=21to33V
V
i=24to33V 100
30 mV
mV
∆VoLoad Regulation Io= 5 to 500 mA Tj=25o
C
I
o= 5 to 200 mA Tj=25o
C360
180 mV
mV
IdQuiescent Current Tj=25o
C6mA
∆I
d
Quiescent Current Change Io= 5 to 350 mA 0.5 mA
∆IdQuiescent Current Change Io = 200 mA Vi= 21 to 33 V 0.8 mA
∆
V
o
∆
T
Output Voltage Drift Io= 5 mA -1.1 mV/oC
eNOutput Noise Voltage B = 10Hz to 100KHz Tj=25o
C 100 µV
SVR Supply Voltage Rejection Io = 300 mA f = 120 Hz Tj=25o
C
V
i=22to32V 53 dB
VdDropout Voltage Tj=25o
C2V
I
sc Short Circuit Current Tj=25o
CV
i
= 35 V 240 mA
Iscp Short Circuit Peack Current Tj=25o
C 700 mA
L78M00AB/AC SERIES
8/15
ELECTRICAL CHARACTERISTICS FOR L78M20XX (refer to the test circuits, Vi= 29V, Io= 350 mA,
Ci= 0.33 µF, Co= 0.1 µF, Tj= -40 to 125 oC (AB), Tj= 0 to 125 oC (AC) unless otherwise specified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VoOutput Voltage Tj=25o
C 19.6 20 20.4 V
VoOutput Voltage Io= 5 mA to 350 mA
Vi=23to35V 19.2 20 20.8 V
∆VoLine Regulation Io= 200 mA Tj=25o
C
V
i=23to35V
V
i=24to35V 100
30 mV
mV
∆VoLoad Regulation Io= 5 to 500 mA Tj=25o
C
I
o= 5 to 200 mA Tj=25o
C400
200 mV
mV
IdQuiescent Current Tj=25o
C6mA
∆I
d
Quiescent Current Change Io= 5 to 350 mA 0.5 mA
∆IdQuiescent Current Change Io = 200 mA Vi= 23 to 35 V 0.8 mA
∆
V
o
∆
T
Output Voltage Drift Io= 5 mA -1.1 mV/oC
eNOutput Noise Voltage B = 10Hz to 100KHz Tj=25o
C 110 µV
SVR Supply Voltage Rejection Io = 300 mA f = 120 Hz Tj=25o
C
V
i=24to34V 53 dB
VdDropout Voltage Tj=25o
C2V
I
sc Short Circuit Current Tj=25o
CV
i
= 35 V 240 mA
Iscp Short Circuit Peack Current Tj=25o
C 700 mA
ELECTRICAL CHARACTERISTICS FOR L78M24XX (refer to the test circuits, Vi= 33V, Io= 350 mA,
Ci= 0.33 µF, Co= 0.1 µF, Tj= -40 to 125 oC (AB), Tj= 0 to 125 oC (AC) unless otherwise specified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VoOutput Voltage Tj=25o
C 23.5 24 24.5 V
VoOutput Voltage Io= 5 mA to 350 mA
Vi=27to38V 23 24 25 V
∆VoLine Regulation Io= 200 mA Tj=25o
C
V
i=27to38V
V
i=28to38V 100
30 mV
mV
∆VoLoad Regulation Io= 5 to 500 mA Tj=25o
C
I
o= 5 to 200 mA Tj=25o
C480
240 mV
mV
IdQuiescent Current Tj=25o
C6mA
∆I
d
Quiescent Current Change Io= 5 to 350 mA 0.5 mA
∆IdQuiescent Current Change Io = 200 mA Vi= 27 to 38 V 0.8 mA
∆
V
o
∆
T
Output Voltage Drift Io= 5 mA -1.2 mV/oC
eNOutput Noise Voltage B = 10Hz to 100KHz Tj=25o
C 170 µV
SVR Supply Voltage Rejection Io = 300 mA f = 120 Hz Tj=25o
C
V
i=28to38V 50 dB
VdDropout Voltage Tj=25o
C2V
I
sc Short Circuit Current Tj=25o
CV
i
= 35 V 240 mA
Iscp Short Circuit Peack Current Tj=25o
C 700 mA
L78M00AB/AC SERIES
9/15
Figure 6 : PeakOutput Current vs. Input-Output
Differential Voltage. Figure 7 : OutputVoltage vs.Junction Tempera-
ture.
Figure8 : Supply Voltage Rejection vs. Frequen-
cy. Figure 9 : Quiescent Current vs. Junction Tempe-
rature.
Figure 4 : Dropout Voltagevs. Junction Tempera-
ture. Figure 5 : Dropout Characteristics.
L78M00AB/AC SERIES
10/15
Figure 12 : Quiescent Current vs. InputVoltage.
APPLICATIONS INFORMATION
DESIGNCONSIDERATIONS
The L78M00AB Series of fixed voltage regulators
are designed withThermal Overload Protection that
shuts down the circuit when subjected to an
excessive power overload condition, Internal
Short-Circuit Protection that limits the maximum
current the circuit will pass, and Output Transistor
Safe-Area Compensation that reduces the output
short-circuit as the voltage across the pass
transistor is increased.
In many low current applications, compensation
capacitors are not required. However, it is
recommended that theregulator input be bypassed
with a capacitor if the regulator is connected to the
power supply filter with long wire lengths, or if the
output load capacitance is large. An input bypass
capacitor should be selected to provide good
high-frequency characteristics to insure stable
operation under all load conditions. A 0.33µFor
larger tantalum, mylar, or othercapacitor having low
internal impedance at high frequencies should be
chosen. The bypass capacitor should be mounted
with the shortest possible leads directly across the
regulators input terminals. Normally good
construction techniques should be usedtominimize
ground loops and lead resistance drops since the
regulator has no external sense lead.
Figure 10 : Load Transient Response. Figure 11 : Line Transient Response.
L78M00AB/AC SERIES
11/15
Figure 13 : Current Regulator. Figure 14 : Adjustable Output Regulator.
VO, 7.0V to 20V
Vi–VO≥2.0V
Figure 15 : Current Boost Regulator. Figure 16 : Short-circuit Protection.
The addition of an operational amplifier allows ad-
justment to higher or intermediate values while re-
taining regulation characteristics. The minimum
voltage obtainable with this arrangement is 2.0V
greater than the regulator voltage.
VXX
Io=+I
d
R
1
V
BEQ1
R1=IQ1
IREQ –βQ1VBEQ1
IO=IREG +Q
1[IREG –]
R
1
The circuit of figure 6 can be modified to provide
supply protection against short circuits by adding a
short-circuit sense resistor, RSC, and an additional
PNP transistor. The current sensing PNP must be
able to handle the short-circuit current of the
three-terminal regulator. Therefore, a four-ampere
plasticpowertransistor is specified.
L78M00AB/AC SERIES
12/15
DIM. mm inch
MIN. TYP. MAX. MIN. TYP. MAX.
A 4.8 0.189
C 1.37 0.054
D 2.4 2.8 0.094 0.110
D1 1.2 1.35 0.047 0.053
E 0.35 0.55 0.014 0.022
F 0.8 1.05 0.031 0.041
F2 1.15 1.4 0.045 0.055
G 4.95 5.08 5.21 0.195 0.200 0.205
H2 10.4 0.409
H3 10.05 10.4 0.396 0.409
L2 16.2 0.638
L3 26.3 26.7 27.1 1.035 1.051 1.067
L5 2.6 3 0.102 0.118
L6 15.1 15.8 0.594 0.622
L7 6 6.6 0.236 0.260
Dia. 3.65 3.85 0.144 0.152
TO-220 MECHANICAL DATA
P011D
L78M00AB/AC SERIES
13/15
DIM. mm inch
MIN. TYP. MAX. MIN. TYP. MAX.
A 2.2 2.4 0.086 0.094
A1 0.9 1.1 0.035 0.043
A2 0.03 0.23 0.001 0.009
B 0.64 0.9 0.025 0.035
B2 5.2 5.4 0.204 0.212
C 0.45 0.6 0.017 0.023
C2 0.48 0.6 0.019 0.023
D 6 6.2 0.236 0.244
E 6.4 6.6 0.252 0.260
G 4.4 4.6 0.173 0.181
H 9.35 10.1 0.368 0.397
L2 0.8 0.031
L4 0.6 1 0.023 0.039
A
C2
C
H
A1
A2
==
D
L2
L4
13
==
B
E
==
B2
G
2
DETAIL”A”
DETAIL”A”
TO-252 (DPAK) MECHANICAL DATA
0068772-B
L78M00AB/AC SERIES
14/15
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsability for the
consequences of use of such informationnor for any infringement of patents or other rights of third parties which may results fromits use.No
licenseis granted by implication or otherwise under any patentor patentrights of SGS-THOMSON Microelectronics. Specifications mentioned
in this publication aresubject to change withoutnotice. Thispublication supersedes andreplacesall information previously supplied.
SGS-THOMSON Microelectronics products are not authorized for use ascriticalcomponents in lifesupport devices or systems withoutexpress
writtenapproval ofSGS-THOMSONMicroelectonics.
1997 SGS-THOMSONMicroelectronics - Printed in Italy- All Rights Reserved
SGS-THOMSONMicroelectronics GROUP OF COMPANIES
Australia - Brazil -Canada -China - France- Germany - HongKong - Italy - Japan- Korea-Malaysia - Malta- Morocco - TheNetherlands -
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.
L78M00AB/AC SERIES
15/15
