A LM7805 Voltage Regulator is a voltage regulator that outputs +5 volts.
An easy way to remember the voltage output by a LM78XX series of voltage regulators is the last two digits of the number. A LM7805 ends with “05”; thus, it outputs 5 volts. The “78” part is just the convention that the chip makers use to denote the series of regulators that output positive voltage. The other series of regulators, the LM79XX, is the series that outputs negative voltage. So:
LM78XX: Voltage regulators that output positive voltage, “XX”=voltage output.
LM79XX: Voltage regulators that output negative voltage, “XX”=voltage output
The LM7805, like most other regulators, is a three-pin IC.
Pin 1Â (Input Pin): The Input pin is the pin that accepts the incoming DC voltage, which the voltage regulator will eventually regulate down to 5 volts.
Pin 2Â (Ground): Ground pin establishes the ground for the regulator.
Pin 3Â (Output Pin): The Output pin is the regulated 5 volts DC.
Pin Details of 7805 IC
Pin No.
Pin
Function
Description
1
INPUT
Input voltage (7V-35V)
In this pin of the IC positive unregulated voltage is given in regulation.
2
GROUND
Ground (0V)
In this pin where the ground is given. This pin is neutral for equally the input and output.
3
OUTPUT
Regulated output; 5V (4.8V-5.2V)
The output of the regulated 5V volt is taken out at this pin of the IC regulator.
Applications
7805 IC is used in a wide range of circuits. The major ones being:
Fixed-Output Regulator
Positive Regulator in Negative Configuration
Adjustable Output Regulator
Current Regulator
Adjustable DC Voltage Regulator
Regulated Dual-Supply
Output Polarity-Reversal-Protection Circuit
Reverse bias projection Circuit
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