L7805CT STMicroelectronics, L7805CT Datasheet - Page 28

IC REGULATOR POS 5V TO-3

L7805CT

Manufacturer Part Number
L7805CT
Description
IC REGULATOR POS 5V TO-3
Manufacturer
STMicroelectronics
Type
Voltage Regulatorr
Datasheets

Specifications of L7805CT

Regulator Topology
Positive Fixed
Voltage - Output
5V
Voltage - Input
Up to 35V
Voltage - Dropout (typical)
2V @ 1A
Number Of Regulators
1
Current - Output
1.5A
Operating Temperature
0°C ~ 125°C
Mounting Type
Through Hole
Package / Case
TO-204, TO-3
Polarity
Positive
Number Of Outputs
1
Output Type
Fixed
Output Voltage
5 V
Output Current
1.5 A
Line Regulation
100 mV
Load Regulation
100 mV
Dropout Voltage (max)
2 V
Input Voltage Max
35 V
Maximum Operating Temperature
+ 125 C
Minimum Operating Temperature
0 C
Mounting Style
Through Hole
Current, Output
1.5 A
Current, Supply
8 mA
Package Type
TO-3
Regulation, Line
3 mV
Regulation, Load
100 mV
Regulator Type
Positive Voltage Out
Resistance, Thermal, Junction To Case
4 °C/W
Temperature, Operating, Range
0 to +150 °C
Voltage, Dropout
2 V
Voltage, Input
10 V
Voltage, Noise
40 μV/V
Voltage, Output
5 V
Voltage, Supply, Rejection Ratio
62 dB
Primary Input Voltage
10V
Output Voltage Fixed
5V
Dropout Voltage Vdo
2V
No. Of Outputs
1
No. Of Pins
3
Operating Temperature Range
0°C To +150°C
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Current - Limit (min)
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
497-1005

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Part Number:
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Application information
6
6.1
Figure 8.
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Application information
Design consideration
The L78xx 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 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 capacitor if the regulator is connected to the power supply filter with
long 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 0.33 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. Normally
good construction techniques should be used to minimize ground loops and lead resistance
drops since the regulator has no external sense lead.
The addition of an operational amplifier allows adjustment to higher or intermediate values
while retaining regulation characteristics. The minimum voltage obtained with the
arrangement is 2 V greater than the regulator voltage.
The circuit of
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.
Fixed output regulator
1. To specify an output voltage, substitute voltage value for "XX".
2. Although no output capacitor is need for stability, it does improve transient response.
3. Required if regulator is locate an appreciable distance from power supply filter.
Figure 13
can be modified to provide supply protection against short circuit by
Doc ID 2143 Rev 23
L78xx, L78xxC, L78xxAB, L78xxAC

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