ME7805
1.2A 3-Terminal
Positive Voltage Regulator ME7805
General Description
Features
ME7805 is three-terminal positive regulators.
●Output Current of 1.2A
One of these regulators can deliver up to 1.2A of
●Output Voltages of 5V±5% over the temp-
output current. The internal limiting and thermal
erature range
-shutdown features of the regulator make them
●Thermal Overload Protection
essentially immune to overload. When used as a
●Short Circuit Protection
replacement for a zener diode-resistor Comb-
●Output transistor safe area protection
ination, an effective improvement in output impe-
●No external components
dance can be obtained, together with lower
●Package:TO-220
quiescent current.
Pin Configuration
1. Input
2. GND
3. Output
Maximum Ratings(Ta=25℃)
Parameter
Rating
Unit
Input supply voltage : VIN
35
V
MAX. Output current:Iout
1200
mA
Maximum junction temperature: Tj
-25~125
℃
Storage temperature :Tstr
-65~150
℃
Soldering temperature and time
+260(Recommended 10S)
℃
Caution: The absolute maximum ratings are rated values exceeding which the product could suffer physical damage.
These values must therefore not be exceeded under any conditions.
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ME7805
Block Diagram
Electrical Characteristics
(Cin =0.33μF, Co =0.1μF,0≤Tj≤125OC, unless otherwise noted)
Parameter
Symbol
Conditions
Min.
Typ.
Max.
IO=500mA, VIN=10V
4.8
5.0
5.25
IO=1mA~1A,Po≤15W
VIN=8V~20V
4.65
5.0
5.35
VIN=7V~25V,IO=500mA
-
3
50
VIN=8V~25V,IO=500mA
-
1
25
VIN=10V,IO=5mA-1.2A
-
-
100
VIN=10V,IO=250mA-750mA
-
-
25
Unit
Output Voltage
VO
Line Regulations
LNR
Load Regulation
LDR
Dropout Voltage
VDIF
Tj=25OC,Io=100mA
-
2
-
V
Output noise Voltage
VN
f=10Hz to 100KHz
-
10
-
μV/Vo
Ripple Rejection
PSRR
Tj=25OC,f=120Hz,Io=40mA
VIN=8V~20V
-
68
-
dB
Quiescent Current
IQ
VIN=10V,IOUT=500mA
-
-
6.0
mA
Quiescent Current
Change
ΔIQ
VIN=14.5V~30V,IO=500mA
-
-
0.8
VIN=10V,IO=5mA~1A,
-
-
0.5
V
mV
mV
mA
LNR: Line Regulation. The change in output voltage for a change in the input voltage. The measurement is made
under conditions of low dissipation or by using pulse techniques such that the average chip temperature is
not significantly affected.
LDR: Load Regulation.The change in output voltage for a change in load current at constant chip temperature.
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ME7805
Type Characteristics
Ta=25℃
VIN=10V
Ta=25℃
Io=500mA
Io=100mA
Io=10mA
VIN=7V
VIN=10V
Ta=25℃
VIN=10V
Ta=25℃
Io=100mA
Ta=25℃
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ME7805
Operation Description
ME7805 is designed with Thermal 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 current as the voltage
across the pass transistor is increased.
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. 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
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 regulator’s 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.
Typical Application Circuit
Fig.1 Fixed Output Regulator
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 improve transient response.
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ME7805
ME7805
Input
VIN
Cin
0.33μF
Output
GND
R
IQ
Io
Constant Current to
Grounded Load
Fig.2 Constant Current Regulator
The ME7805 regulatorcan also be used as a current source when connected as Fig.2. In order to minimize
dissipation the ME7805 is chosen in this application. Resistor R determines the current as follows:
IO =
5V
+IQ
R
IQ ≌ 3.2mA over line and load changes
Fig.3 Adjustable Output Regulator
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 2.0 V greater than the regulator
voltage.
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ME7805
Package Information
Package Type:TO-220
Symbol
Millimeters
Min.
Max.
Min.
Max.
A
9.8
10.2
0.386
0.4016
a
4.58
5.58
0.1803
0.2197
B
13.5
14.5
0.5315
0.5709
b
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Inches
0.1575
4.0
C
4.0
4.4
0.1575
0.1732
c
4.0
4.4
0.1575
0.1732
D
1.3
1.5
0.0512
0.059
E
0.7
0.9
0.0276
0.0354
F
1.1
1.5
0.0433
0.059
f
0.4
0.7
0.0157
0.0246
H
16.4
17
0.6457
0.6693
h
7.3
7.7
0.2874
0.3031
R
Φ3.0
Φ3.2
Φ0.1181
Φ0.126
Page 6 of 6
ME7805
z
z
z
z
z
V01
The information described herein is subject to change without notice.
Nanjing Micro One Electronics Inc is not responsible for any problems caused by circuits or diagrams
described herein whose related industrial properties, patents, or other rights belong to third parties.
The application circuit examples explain typical applications of the products, and do not guarantee the
success of any specific mass-production design.
Use of the information described herein for other purposes and/or reproduction or copying without the
express permission of Nanjing Micro One Electronics Inc is strictly prohibited.
The products described herein cannot be used as part of any device or equipment affecting the human
body, such as exercise equipment, medical equipment, security systems, gas equipment, or any
apparatus installed in airplanes and other vehicles, without prior written permission of Nanjing Micro
One Electronics Inc.
Although Nanjing Micro One Electronics Inc exerts the greatest possible effort to ensure high quality
and reliability, the failure or malfunction of semiconductor products may occur. The user of these
products should therefore give thorough consideration to safety design, including redundancy,
fire-prevention measures, and malfunction prevention, to prevent any accidents, fires, or community
damage that may ensue.
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