IC REGULATOR POS 5V TO-3

L7805CT

Manufacturer Part NumberL7805CT
DescriptionIC REGULATOR POS 5V TO-3
ManufacturerSTMicroelectronics
TypeVoltage Regulator
L7805CT datasheets
 


Specifications of L7805CT

Regulator TopologyPositive FixedVoltage - Output5V
Voltage - InputUp to 35VVoltage - Dropout (typical)2V @ 1A
Number Of Regulators1Current - Output1.5A
Operating Temperature0°C ~ 125°CMounting TypeThrough Hole
Package / CaseTO-204, TO-3PolarityPositive
Number Of Outputs1Output TypeFixed
Output Voltage5 VOutput Current1.5 A
Line Regulation100 mVLoad Regulation100 mV
Dropout Voltage (max)2 VInput Voltage Max35 V
Maximum Operating Temperature+ 125 CMinimum Operating Temperature0 C
Mounting StyleThrough HoleCurrent, Output1.5 A
Current, Supply8 mAPackage TypeTO-3
Regulation, Line3 mVRegulation, Load100 mV
Regulator TypePositive Voltage OutResistance, Thermal, Junction To Case4 °C/W
Temperature, Operating, Range0 to +150 °CVoltage, Dropout2 V
Voltage, Input10 VVoltage, Noise40 μV/V
Voltage, Output5 VVoltage, Supply, Rejection Ratio62 dB
Primary Input Voltage10VOutput Voltage Fixed5V
Dropout Voltage Vdo2VNo. Of Outputs1
No. Of Pins3Operating Temperature Range0°C To +150°C
Rohs CompliantYesLead Free Status / RoHS StatusLead free / RoHS Compliant
Current - Limit (min)-Other names497-1005
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Application information
6
Application information
6.1
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
Figure 13
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.
Figure 8.
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.
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can be modified to provide supply protection against short circuit by
Doc ID 2143 Rev 23
L78xx, L78xxC, L78xxAB, L78xxAC