The MC78L00, A Series of positive voltage regulators are inexpensive,
easy–to–use devices suitable for a multitude of applications that require a
regulated supply of up to 100 mA. Like their higher powered MC7800 and
MC78M00 Series cousins, these regulators feature internal current limiting
and thermal shutdown making them remarkably rugged. No external
components are required with the MC78L00 devices in many applications.
These devices offer a substantial performance advantage over the
traditional zener diode–resistor combination, as output impedance and
quiescent current are substantially reduced.
• Available in either ±5% (AC) or ±10% (C) Selections
Representative Schematic Diagram
15k
Z1
Q1
3.8k
1.2k
420
Q4Q6
Q2
Q3Q5
1.9k19k2.2k
C
Q8
Q7
1.0k
Q10
Q9
Q11
Q12
5.0k
0–25k
ORDERING INFORMATION
Operating
Device
MC78LXXACD*
MC78LXXACP
MC78LXXCPPlastic Power
MC78LXXABD*
MC78LXXABP*
XX indicates nominal voltage
*Available in 5, 8, 9, 12 and 15 V devices.
Temperature Range
TJ = 0° to +125°C
–
J
= –
°
°
Input
3.0
Output
2.85k
Ground
Package
SOP–8
Plastic Power
SOP–8
Plastic Power
P SUFFIX
CASE 29
Pin 1. Output
2. GND
3. Input
8
1
Pin 1. V
out
2. GND
3. GND
4. NC
*SOP–8 is an internally modified SO–8 package.
Pins 2, 3, 6, and 7 are electrically common to the die
attach flag. This internal lead frame modification
decreases package thermal resistance and
increases power dissipation capability when
appropriately mounted on a printed circuit board.
SOP–8 conforms to all external dimensions of the
standard SO–8 package.
1
2
3
D SUFFIX
PLASTIC PACKAGE
CASE 751
(SOP–8)*
5. NC
6. GND
7. GND
8. V
in
Standard Application
Input
Cin*
0.33
µ
F
A common ground is required between the input
and the output voltages. The input voltage must
remain typically 2.0 V above the output voltage even
during the low point on the input ripple voltage.
*Cin is required if regulator is located an
*appreciable distance from power supply filter.
**CO is not needed for stability; however, it does
Figure 5. Maximum Average Power Dissipation versus
Ambient T emperature – TO–92 Type Package
10,000
1000
100
, POWER DISSIPATION (mW)
D
R
P
θ
P
D(max)
10
255075100125150
JA
°
C/W
= 200
°
to 25
TA, AMBIENT TEMPERATURE (°C)
No Heatsink
C = 625 mW
6
Figure 6. SOP–8 Thermal Resistance and Maximum
Power Dissipation versus P.C.B. Copper Length
170
150
130
°
110
90
70
JA
JUNCTION-TO-AIR ( C/W)
θ
R, THERMAL RESISTANCE
50
30
02030504010
R
θ
JA
L, LENGTH OF COPPER (mm)
P
for TA = 50°C
D(max)
Graph represents symmetrical layout
2.0 oz.
L
Copper
MOTOROLA ANALOG IC DEVICE DATA
3.2
2.8
2.4
2.0
1.6
3.0 mmL
1.2
0.8
0.4
, MAXIMUM POWER DISSIPATION (W)
D
P
Page 7
MC78L00, A Series
APPLICATIONS INFORMATION
Design Considerations
The MC78L00 Series of fixed voltage regulators are
designed with Thermal Overload Protection that shuts down
the circuit when subjected to an excessive power overload
condition. Internal Short Circuit Protection limits the
maximum current the circuit will pass.
In many low current applications, compensation
capacitors are not required. However, it is recommended 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. The input
Figure 7. Current RegulatorFigure 8. ± 15 V Tracking Voltage Regulator
Input
0.33
µ
F
The MC78L00 regulators can also be used as a current source
when connected as above. In order to minimize dissipation the
MC78L05C is chosen in this application. Resistor R determines
the current as follows:
IIB = 3.8 mA over line and load changes
For example, a 100 mA current source would require R to be a
Ω
, 1/2 W resistor and the output voltage compliance would be
50
the input voltage less 7 V.
MC78L05
5.0 V
IO =
R
Constant
Current to
Grounded Load
I
O
+ I
B
R
bypass capacitor should be selected to provide good
high–frequency characteristics to insure stable operation
under all load conditions. A 0.33 µF or larger tantalum, mylar,
or other capacitor 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. Good construction techniques
should be used to minimize ground loops and lead resistance
drops since the regulator has no external sense lead.
Bypassing the output is also recommended.
+20V
0.33
µ
F
0.33µF
20V
MC78L15+V
10k
10k
–V
6
MPS U55
7
MC1741
4
6.5
2
–
3
+
MPS A70
O
O
Figure 9. Positive and Negative Regulator
+V
I
0.33µF
–V
I
0.33µF
MC78LXX
MC79LXX
0.1
0.1
+V
O
µ
F
µ
F
–V
O
MOTOROLA ANALOG IC DEVICE DATA
7
Page 8
SEATING
PLANE
MC78L00, A Series
OUTLINE DIMENSIONS
P SUFFIX
PLASTIC PACKAGE
CASE 29–04
A
B
R
P
ISSUE AD
L
XX
V
1
F
G
H
K
D
J
C
SECTION X–X
N
N
D SUFFIX
PLASTIC PACKAGE
CASE 751–05
(SOP–8)
ISSUE R
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. CONTOUR OF PACKAGE BEYOND DIMENSION R
IS UNCONTROLLED.
4. DIMENSION F APPLIES BETWEEN P AND L.
DIMENSION D AND J APPLY BETWEEN L AND K
MINIMUM. LEAD DIMENSION IS UNCONTROLLED
IN P AND BEYOND DIMENSION K MINIMUM.
Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty , representation or guarantee regarding
the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and
specifically disclaims any and all liability, including without limitation consequential or incidental damages. “T ypical” parameters which may be provided in Motorola
data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals”
must be validated for each customer application by customer’s technical experts. Motorola does not convey any license under its patent rights nor the rights of
others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other
applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury
or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola
and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees
arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that Motorola
was negligent regarding the design or manufacture of the part. Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal
Opportunity/Affirmative Action Employer.
D
58
0.25MB
1
H
4
e
M
h
X 45
_
q
C
A
SEATING
PLANE
0.10
L
B
SS
A0.25MCB
NOTES:
1. DIMENSIONING AND TOLERANCING PER ASME
Y14.5M, 1994.
2. DIMENSIONS ARE IN MILLIMETERS.
3. DIMENSION D AND E DO NOT INCLUDE MOLD
PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 PER SIDE.
5. DIMENSION B DOES NOT INCLUDE MOLD
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.127 TOTAL IN EXCESS
OF THE B DIMENSION AT MAXIMUM MATERIAL
CONDITION.
MILLIMETERS
DIMMINMAX
A1.351.75
A10.100.25
B0.350.49
C0.180.25
D4.805.00
E
3.804.00
1.27 BSCe
H5.806.20
h
0.250.50
L0.401.25
0 7
q
__
How to reach us:
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8
◊
MOTOROLA ANALOG IC DEVICE DATA
MC78L00/D
*MC78L00/D*
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