The L78M00AB series of three-terminal positive
regulators is available in TO-220 and DPAK
packages and with several fixed outp ut 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
employsinternalcurrentlimiting,thermal
shut-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 as fixed
L78M00AB/AC
SERIES
TO-220
DPAK
voltage regulators, these devices can be used
with external components to obtain adjustable
voltage an d currents.
SCHEMATIC DIAGRAM
1/17October 2003
L78M00AB/AC SERIES
ABSOLUTE MAXIMUM RATINGS
SymbolParameter²ValueUnit
V
I
P
T
T
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is
not implied.
L78M05ABL78M05ABVL78M05ABDT5 V
L78M05ACL78M05ACDT5 V
L78M06ABL78M06ABVL78M06ABDT6 V
L78M06ACL78M06ACDT6 V
L78M08ABL78M08ABVL78M08ABDT8 V
L78M08ACL78M08ACDT8 V
L78M09ABL78M09ABVL78M09ABDT9 V
L78M09ACL78M09ACDT9 V
L78M10ABL78M10ABVL78M10ABDT10 V
L78M10ACL78M10ACDT10 V
L78M12ABL78M12ABVL78M12ABDT12 V
L78M12ACL78M12ACDT12 V
L78M15ABL78M15ABVL78M15ABDT15 V
L78M15ACL78M15ACDT15 V
L78M18ABL78M18ABVL78M18ABDT18 V
L78M18ACL78M18ACDT18 V
L78M20ABL78M20ABVL78M20ABDT20 V
L78M20ACL78M20ACDT20 V
L78M24ABL78M24ABVL78M24ABDT24 V
L78M24ACL78M24ACDT24 V
L78M00AB/AC SE RIES
(*) Available in Tape & Reel with the suffix "-TR".
APPLICATION CIRCUITS
3/17
L78M00AB/AC SERIES
TEST CIRCUITS
Figure1 : DC Parameter
Figure2 : Load Regulation
Figure3 : Ripple Rejection
4/17
L78M00AB/AC SE RIES
ELECTRICAL CHARACTERISTICS OF L78M05XX (refer to the t est circuits, VI= 10V, IO=350mA,
C
=0.33µF,CO=0.1µF,TJ= -40 to 125°C (AB), TJ= 0 to 125°C (AC) unless otherwise specified)
I
SymbolParameterTest ConditionsMin.Typ.Max.Unit
V
Output VoltageTJ= 25°C4.955.1V
O
Output VoltageIO= 5 to 350 mAVI= 7 to 20 V4.855.2V
V
O
∆V
∆V
∆V
SVRSupply Voltage RejectionV
Line RegulationVI= 7 to 25 V, IO= 200 mATJ= 25°C100mV
O
= 8 to 25 V, IO= 200 mATJ=25°C50
V
I
Load RegulationIO= 5 to 500 mATJ= 25°C100mV
O
I
= 5 to 200 mATJ= 25°C50
O
Quiescent CurrentTJ= 25°C6mA
I
d
Quiescent Current Change IO= 5 to 350 mA0.5mA
∆I
d
= 200 mAVI= 8 to 25 V0.8
I
O
/∆T Output Voltage DriftIO= 5 mA-0.5mV/°C
O
= 8 to 18 Vf = 120Hz
I
= 300mATJ= 25°C
I
O
eNOutput Noise VoltageB =10Hz to 100KHzT
Dropout VoltageTJ= 25°C2V
V
d
Short Circuit CurrentTJ= 25°CVI= 35 V300mA
I
sc
Short Circuit Peak CurrentTJ= 25°C700mA
I
scp
= 25°C40µV
J
62dB
ELECTRICAL CHARACTERISTICS OF L78M06XX (refer to the t est circuits, V
C
=0.33µF,CO=0.1µF,TJ= -40 to 125°C (AB), TJ= 0 to 125°C (AC) unless otherwise specified)
I
= 11V, IO=350mA,
I
SymbolParameterTest ConditionsMin.Typ.Max.Unit
Output VoltageTJ= 25°C5.8866.12V
V
O
Output VoltageIO= 5 to 350 mAVI= 8 to 21 V5.7566.3V
V
O
∆V
∆V
∆V
SVRSupply Voltage RejectionV
Line RegulationVI= 8 to 25 V, IO= 200 mATJ= 25°C100mV
O
= 9 to 25 V, IO= 200 mATJ=25°C30
V
I
Load RegulationIO= 5 to 500 mATJ= 25°C120mV
O
= 5 to 200 mATJ= 25°C60
I
O
Quiescent CurrentTJ= 25°C6mA
I
d
∆I
Quiescent Current Change IO= 5 to 350 mA0.5mA
d
= 200 mAVI= 9 to 25 V0.8
I
O
/∆T Output Voltage DriftIO= 5 mA-0.5mV/°C
O
= 9 to 19 Vf = 120Hz
I
I
= 300mATJ= 25°C
O
59dB
eNOutput Noise VoltageB =10Hz to 100KHz45µV
V
Dropout VoltageTJ= 25°C2V
d
Short Circuit CurrentTJ= 25°CVI= 35 V270mA
I
sc
Short Circuit Peak CurrentTJ= 25°C700mA
I
scp
5/17
L78M00AB/AC SERIES
ELECTRICAL CHARACTERISTICS OF L78M08XX (refer to the t est circuits, VI= 14V, IO=350mA,
C
=0.33µF,CO=0.1µF,TJ= -40 to 125°C (AB), TJ= 0 to 125°C (AC) unless otherwise specified)
I
SymbolParameterTest ConditionsMin.Typ.Max.Unit
V
Output VoltageTJ= 25°C7.8488.16V
O
Output VoltageIO= 5 to 350 mAVI= 10.5 to 23 V7.788.3V
V
O
∆V
∆V
∆V
SVRSupply Voltage RejectionV
Line RegulationVI= 10.5 to 25 V, IO= 200 mA TJ= 25°C100mV
O
=11to25V,IO= 200 mATJ= 25°C30
V
I
Load RegulationIO= 5 to 500 mATJ= 25°C160mV
O
I
= 5 to 200 mATJ= 25°C80
O
Quiescent CurrentTJ= 25°C6mA
I
d
Quiescent Current Change IO= 5 to 350 mA0.5mA
∆I
d
= 200 mAVI= 10.5 to 25 V0.8
I
O
/∆T Output Voltage DriftIO= 5 mA-0.5mV/°C
O
= 11.5 to 21.5 V f = 120Hz
I
= 300mATJ= 25°C
I
O
eNOutput Noise VoltageB =10Hz to 100KHzT
Dropout VoltageTJ= 25°C2V
V
d
Short Circuit CurrentTJ= 25°CVI= 35 V250mA
I
sc
Short Circuit Peak CurrentTJ= 25°C700mA
I
scp
= 25°C52µV
J
56dB
ELECTRICAL CHARACTERISTICS OF L78M09XX (refer to the t est circuits, V
=0.33µF,CO=0.1µF,TJ= -40 to 125°C (AB), TJ= 0 to 125°C (AC) unless otherwise specified)
C
I
= 14V, IO=350mA,
I
SymbolParameterTest ConditionsMin.Typ.Max.Unit
Output VoltageTJ= 25°C8.8299.18V
V
O
Output VoltageIO= 5 to 350 mAVI= 11.5 to 24 V8.6499.36V
V
O
∆V
∆V
∆V
SVRSupply Voltage RejectionV
Line RegulationVI= 11.5 to 25 V, IO= 200 mA TJ= 25°C100mV
O
=12to25V,IO= 200 mATJ=25°C30
V
I
Load RegulationIO= 5 to 500 mATJ= 25°C180mV
O
= 5 to 200 mATJ= 25°C90
I
O
Quiescent CurrentTJ= 25°C6mA
I
d
∆I
Quiescent Current Change IO= 5 to 350 mA0.5mA
d
= 200 mAVI= 11.5 to 25 V0.8
I
O
/∆T Output Voltage DriftIO= 5 mA-0.5mV/°C
O
= 12.5 to 23 Vf = 120Hz
I
I
= 300mATJ= 25°C
O
eNOutput Noise VoltageB =10Hz to 100KHzT
Dropout VoltageTJ= 25°C2V
V
d
I
Short Circuit CurrentTJ= 25°CVI= 35 V250mA
sc
Short Circuit Peak CurrentTJ= 25°C700mA
I
scp
= 25°C52µV
J
56dB
6/17
L78M00AB/AC SE RIES
ELECTRICAL CHARACTERISTICS OF L78M10XX (refer to the t est circuits, VI= 16V, IO=350mA,
C
=0.33µF,CO=0.1µF,TJ= -40 to 125°C (AB), TJ= 0 to 125°C (AC) unless otherwise specified)
I
SymbolParameterTest ConditionsMin.Typ.Max.Unit
V
Output VoltageTJ= 25°C9.81010.2V
O
Output VoltageIO= 5 to 350 mAVI= 12.5 to 25 V9.61010.4V
V
O
∆V
∆V
∆V
SVRSupply Voltage RejectionV
Line RegulationVI= 12.5 to 30 V, IO= 200 mA TJ= 25°C100mV
O
=13to30V,IO= 200 mATJ=25°C30
V
I
Load RegulationIO= 5 to 500 mATJ= 25°C200mV
O
I
= 5 to 200 mATJ= 25°C100
O
Quiescent CurrentTJ= 25°C6mA
I
d
Quiescent Current Change IO= 5 to 350 mA0.5mA
∆I
d
= 200 mAVI= 12.5 to 30 V0.8
I
O
/∆T Output Voltage DriftIO= 5mA-0.5mV/°C
O
= 13.5 to 24 Vf = 120Hz
I
= 300mATJ= 25°C
I
O
eNOutput Noise VoltageB =10Hz to 100KHzT
Dropout VoltageTJ= 25°C2V
V
d
Short Circuit CurrentTJ= 25°CVI= 35 V245mA
I
sc
Short Circuit Peak CurrentTJ= 25°C700mA
I
scp
= 25°C64µV
J
56dB
ELECTRICAL CHARACTERISTICS OF L78M12XX (refer to the t est circuits, V
C
=0.33µF,CO=0.1µF,TJ= -40 to 125°C (AB), TJ= 0 to 125°C (AC) unless otherwise specified)
I
= 19V, IO=350mA,
I
SymbolParameterTest ConditionsMin.Typ.Max.Unit
Output VoltageTJ= 25°C11.751212.25V
V
O
Output VoltageIO= 5 to 350 mAVI= 14.5 to 27 V11.51212.5V
V
O
∆V
∆V
∆V
SVRSupply Voltage RejectionV
Line RegulationVI= 14.5 to 30 V, IO= 200 mA TJ= 25°C100mV
O
=16to30V,IO= 200 mATJ=25°C30
V
I
Load RegulationIO= 5 to 500 mATJ= 25°C240mV
O
= 5 to 200 mATJ= 25°C120
I
O
Quiescent CurrentTJ= 25°C6mA
I
d
Quiescent Current Change IO= 5 to 350 mA0.5mA
∆I
d
= 200 mAVI= 14.5 to 30 V0.8
I
O
/∆T Output Voltage DriftIO= 5 mA-1mV/°C
O
= 15 to 25 Vf = 120Hz
I
I
= 300mATJ= 25°C
O
eNOutput Noise VoltageB =10Hz to 100KHzT
Dropout VoltageTJ= 25°C2V
V
d
Short Circuit CurrentTJ= 25°CVI= 35 V240mA
I
sc
Short Circuit Peak CurrentTJ= 25°C700mA
I
scp
= 25°C75µV
J
55dB
7/17
L78M00AB/AC SERIES
ELECTRICAL CHARACTERISTICS OF L78M15XX (refer to the t est circuits, VI= 23V, IO=350mA,
C
=0.33µF,CO=0.1µF,TJ= -40 to 125°C (AB), TJ= 0 to 125°C (AC) unless otherwise specified)
I
SymbolParameterTest ConditionsMin.Typ.Max.Unit
V
Output VoltageTJ= 25°C14.71515.3V
O
Output VoltageIO= 5 to 350 mAVI= 17.5 to 30 V14.41515.6V
V
O
∆V
∆V
∆V
SVRSupply Voltage RejectionV
Line RegulationVI= 17.5 to 30 V, IO= 200 mA TJ= 25°C100mV
O
=20to30V,IO= 200 mATJ=25°C30
V
I
Load RegulationIO= 5 to 500 mATJ= 25°C300mV
O
I
= 5 to 200 mATJ= 25°C150
O
Quiescent CurrentTJ= 25°C6mA
I
d
Quiescent Current Change IO= 5 to 350 mA0.5mA
∆I
d
= 200 mAVI= 17.5 to 30 V0.8
I
O
/∆T Output Voltage DriftIO= 5 mA-1mV/°C
O
= 22 to 32 Vf = 120Hz
I
= 300mATJ= 25°C
I
O
eNOutput Noise VoltageB =10Hz to 100KHzT
Dropout VoltageTJ= 25°C2V
V
d
Short Circuit CurrentTJ= 25°CVI= 35 V240mA
I
sc
Short Circuit Peak CurrentTJ= 25°C700mA
I
scp
= 25°C90µV
J
54dB
ELECTRICAL CHARACTERISTICS OF L78M18XX (refer to the t est circuits, V
=0.33µF,CO=0.1µF,TJ= -40 to 125°C (AB), TJ= 0 to 125°C (AC) unless otherwise specified)
C
I
= 26V, IO=350mA,
I
SymbolParameterTest ConditionsMin.Typ.Max.Unit
Output VoltageTJ= 25°C17.641818.36V
V
O
Output VoltageIO= 5 to 350 mAVI= 20.5 to 33 V17.31818.7V
V
O
∆V
∆V
∆V
SVRSupply Voltage RejectionV
Line RegulationVI=21to33V,IO= 200 mA TJ= 25°C100mV
O
=24to33V,IO= 200 mA TJ= 25°C30
V
I
Load RegulationIO= 5 to 500 mATJ= 25°C360mV
O
= 5 to 200 mATJ= 25°C180
I
O
Quiescent CurrentTJ= 25°C6mA
I
d
∆I
Quiescent Current Change IO= 5 to 350 mA0.5mA
d
= 200 mAVI=21to33V0.8
I
O
/∆T Output Voltage DriftIO= 5 mA-1.1mV/°C
O
= 22 to 32 Vf = 120Hz
I
I
= 300mATJ= 25°C
O
eNOutput Noise VoltageB =10Hz to 100KHzT
Dropout VoltageTJ= 25°C2V
V
d
I
Short Circuit CurrentTJ= 25°CVI= 35 V240mA
sc
Short Circuit Peak CurrentTJ= 25°C700mA
I
scp
= 25°C100µV
J
53dB
8/17
L78M00AB/AC SE RIES
ELECTRICAL CHARACTERISTICS OF L78M20XX (refer to the t est circuits, VI= 29V, IO=350mA,
C
=0.33µF,CO=0.1µF,TJ= -40 to 125°C (AB), TJ= 0 to 125°C (AC) unless otherwise specified)
I
SymbolParameterTest ConditionsMin.Typ.Max.Unit
V
Output VoltageTJ= 25°C19.62020.4V
O
Output VoltageIO= 5 to 350 mAVI=23to35V19.22020.8V
V
O
∆V
∆V
∆V
SVRSupply Voltage RejectionV
Line RegulationVI=23to35V,IO= 200 mA TJ= 25°C100mV
O
=24to35V,IO= 200 mA TJ= 25°C30
V
I
Load RegulationIO= 5 to 500 mATJ= 25°C400mV
O
I
= 5 to 200 mATJ= 25°C200
O
Quiescent CurrentTJ= 25°C6mA
I
d
Quiescent Current Change IO= 5 to 350 mA0.5mA
∆I
d
= 200 mAVI=23to35V0.8
I
O
/∆T Output Voltage DriftIO= 5 mA-1.1mV/°C
O
= 24 to 34 Vf = 120Hz
I
= 300mATJ= 25°C
I
O
eNOutput Noise VoltageB =10Hz to 100KHzT
Dropout VoltageTJ= 25°C2V
V
d
Short Circuit CurrentTJ= 25°CVI= 35 V240mA
I
sc
Short Circuit Peak CurrentTJ= 25°C700mA
I
scp
= 25°C110µV
J
53dB
ELECTRICAL CHARACTERISTICS OF L78M24XX (refer to the t est circuits, V
=0.33µF,CO=0.1µF,TJ= -40 to 125°C (AB), TJ= 0 to 125°C (AC) unless otherwise specified)
C
I
= 33V, IO=350mA,
I
SymbolParameterTest ConditionsMin.Typ.Max.Unit
Output VoltageTJ= 25°C23.52424.5V
V
O
Output VoltageIO= 5 to 350 mAVI=27to38V232425V
V
O
∆V
∆V
∆V
SVRSupply Voltage RejectionV
Line RegulationVI=27to38V,IO= 200 mA TJ= 25°C100mV
O
=28to38V,IO= 200 mA TJ= 25°C30
V
I
Load RegulationIO= 5 to 500 mATJ= 25°C480mV
O
= 5 to 200 mATJ= 25°C240
I
O
Quiescent CurrentTJ= 25°C6mA
I
d
∆I
Quiescent Current Change IO= 5 to 350 mA0.5mA
d
= 200 mAVI=27to38V0.8
I
O
/∆T Output Voltage DriftIO= 5 mA-1.2mV/°C
O
= 28 to 38 Vf = 120Hz
I
I
= 300mATJ= 25°C
O
eNOutput Noise VoltageB =10Hz to 100KHzT
Dropout VoltageTJ= 25°C2V
V
d
I
Short Circuit CurrentTJ= 25°CVI= 35 V240mA
sc
Short Circuit Peak CurrentTJ= 25°C700mA
I
scp
= 25°C170µV
J
50dB
9/17
L78M00AB/AC SERIES
Figure4 : Dropout Voltage vs Junction
Temperature
Figure5 : Dropout Characteristics
Figure7 : Output Voltage vs Junction
Temperature
Figure8 : Supply Voltage Rejection vs
Frequency
Figure6 : Peak Output Current vs Input-Output
Differential Voltage
10/17
Figure9 : Quiescent Current vs Junction
Temperature
L78M00AB/AC SE RIES
Figure10 : Load Transient Response
Figure11 : Line Transient Response
Figure12 : Quiescent Current vs Input Voltage
11/17
L78M00AB/AC SERIES
APPLICATIONS INFORMATION
DESIGN CONSIDERATIONS
The L78M00AB Series of fixed voltage regulators are designed with Thermal Overload Protection that
shuts down the circuit when subjected to an excessive power overload condition, Interna l Short-Circuit
Protection that limits the maximum current the circuit will pass, and Output Transistor Safe-Area
Compensation that redu ce s the output short-circuit as the voltage across the pass transistor is increased.
In many low current applications, compen sa tion capacitors are not required. However, it is recomm ended
that the regulator 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 shoul d be
selected to provide good high-frequency characteristics to insure stable operation und er all load
conditions. A 0.33µF or larger tantalum, m y lar, or other capa citor having low internal impedance at high
frequencies should be chosen. The bypass c apacitor should b e mounted with the shortest possible l eads
directly acros s the regulators input terminals. Normally good construction techniques should be used to
minimize ground loops and lead resistance drops since the regulator has no external sense lead.
Figure13 : Current Regulator
V
xx
IO= +I
d
R
1
Figure14 : Adjustable Output Regulator
VO,7.0Vto20V
≥2.0V
V
I-VO
The addition of an operational amplifier allows adjustment to higher or intermediate values while retaining regulation characteristics. The minimum voltage obtainable with this arrangement is 2.0V greater than the regulator voltage.
12/17
Figure15 : Current Boost Regulator
V
R1=
IO=I
BEQ1
I
Q1
I
-
REQ
β
Q1
REG+Q1(IREG
V
BEQ1
)
R
1
Figure16 : Short-Circuit Protection
L78M00AB/AC SE RIES
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 plastic power transistor is specified.
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the
consequences of use o f suc h info rmat ion n or for any in fring ement of paten ts or oth er ri ghts of th ird p arties which may resul t f rom
its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications
mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information
previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or
systems without express written approval of STMicroelectronics.
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