L7809ABD2T-TR

Current - Output:	1.5A
Base Part Number:	L7809A
Supplier Device Package:	D2PAK
Package / Case:	TO-263-3, D²Pak (2 Leads + Tab), TO-263AB
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Protection Features:	Over Temperature, Short Circuit
Control Features:	--
PSRR:	61dB (120Hz)
Current - Quiescent (Iq):	6mA
Series:	--
Voltage Dropout (Max):	2V @ 1A (Typ)
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	9V
Voltage - Input (Max):	35V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Active
Packaging:	Tape & Reel (TR)

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L7809ABD2T-TR Application Field and Working Principle

Introduction: L7809ABD2T-TR is a three terminal adjustable voltage regulator designed and manufactured by STMicroelectronics. It is part of the STMicroelectronics PMIC (power management IC) family of voltage regulators, specifically part of the linear voltage regulator group. The L7809ABD2T-TR has a typical voltage drop of 1.252V and an output current of up to 1.5A.Application Field: The L7809ABD2T-TR can be used to provide stability to both AC and DC line supply voltages. It can also be used as a DC/DC converter which is capable of creating multiple output voltages from a single input voltage. The L7809ABD2T-TR is also able to act as a constant-voltage regulator for applications such as LED lighting and digital displays.Function: The L7809ABD2T-TR is a linear voltage regulator, meaning it works as an electronic component that reduces the input voltage of an electrical circuit to a predetermined voltage output. This is achieved through a control loop which is initiated by an internal band-gap reference. The control loop then compares the output voltage of the regulator to this reference and sends differing amounts of current to the control loop ouput stage depending on voltage levels.Features: The L7809ABD2T-TR offers a range of features which make it a suitable choice for many applications. These include:

• Built-in current protection and thermal shutoff, ensuring that there is no risk of overload, or overheating of the regulator.
• Output voltage trimming, giving users control to adjust the output voltage across a wide range.
• Fast load-response time.
• Integrated shutdown pin; this pin put the regulator into safe-mode when the voltage drops below 1.28V which is effective in protecting circuits.

Working Principle: The working principle of the L7809ABD2T-TR follows the same basic principles that are at work with the other voltage regulators of its’ family. These are all based on the same linear regulator principle, whereby an internal error amplifier compares a reference voltage to the output voltage, and then regulates the output voltage by controlling the current flow to an external load. The reference voltage is created by an internal circuit which includes a voltage divider network and a band-gap reference. This reference voltage is then compared to the output voltage of the regulator. If the output voltage is equal to or greater than the reference, the regulator will stop sending power and the output voltage will remain constant. If the output voltage is less than the reference voltage, the regulator will increase the current flow and bring the output voltage up to the reference voltage. This process of current regulation will continue until either the output voltage reaches the reference voltage, or the maximum current limit is reached.When the output voltage reaches the reference voltage, the regulator stops sending power and the output voltage remains constant. The regulator then goes back into the current regulation cycle whenever the output voltage falls below the reference level.Conclusion: The L7809ABD2T-TR is a three terminal adjustable linear voltage regulator designed and manufactured by STMicroelectronics. It provides a convenient and reliable way to regulate AC and DC output voltages, in addition to providing power for constant voltage applications. It is capable of regulating a wide range of output voltages from a single input voltage and has a range of features including built-in current protection and thermal shutoff, output voltage trimming and a shutdown pin. The regulator works on the same linear regulator principle that is used by the other members of the STMicroelectronic voltage regulator family, controlling the output voltage by regulating the current flow between the input and the output.

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