LD29080DT25R

Current - Output:	800mA
Base Part Number:	LD29080
Supplier Device Package:	DPAK
Package / Case:	TO-252-3, DPak (2 Leads + Tab), SC-63
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Protection Features:	Over Current, Over Temperature
Control Features:	--
PSRR:	70dB (120Hz)
Current - Supply (Max):	35mA
Current - Quiescent (Iq):	180µA
Series:	--
Voltage Dropout (Max):	0.7V @ 800mA
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	2.5V
Voltage - Input (Max):	13V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Active
Packaging:	Tape & Reel (TR)

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LD29080DT25R Application Field and Working Principle

Linear voltage regulators are a variety of devices used to supply DC power to a load. They are commonly used to stabilize the output of AC-DC power transformers and in devices that require a consistent voltage supply. The LD29080DT25R is one such linear voltage regulator, and its applications and working principle are described in this article.

Applications

The LD29080DT25R is a 3-terminal linear regulator that operates from a variety of input voltages, including lower than 5 V and up to a maximum of 15 V. It can achieve a continuous output current of up to 1.25 A, making it suitable for applications where a low voltage and large current is needed, such as handheld devices, portable electronics, and consumer electronics. Another advantage of the LD29080DT25R is its low dropout voltage, allowing it to maintain a stable output during even low-voltage operations. Additionally, the device includes additional features such as thermal shutdown, current limiting, and overvoltage protection.

Working Principle

The working principle of the LD29080DT25R is based on two elements: an internal voltage reference and a pass element. The voltage reference is an internally designed and temperature-stabilized impedance network that is designed to provide constant output between 1.2 V and 10 V, depending on the device. The pass element is an N-channel enhancement-mode MOSFET with a positive-temperature coefficient.When the device is connected to the input voltage, the MOSFET begins to conduct current and dissipates power in the form of heat. This heat moves through the PCB, dissipating into the atmosphere via a sink. This action stabilizes the output voltage, as the degree of heat determines how tightly the MOSFET is conducting, which in turn determines how much voltage drop can occur across the device.When the output voltage begins to exceed the voltage reference, the pass element begins to reduce current flow and the output voltage is regulated. Once the LD29080DT25R reaches a temperature threshold, the output voltage is shut down to prevent any possible damage and to keep the device from becoming completely drained of charge.

Conclusion

The LD29080DT25R is an effective linear voltage regulator, suitable for applications that require a low voltage and large current. It features a low dropout voltage, allowing it to maintain a stable output during even low-voltage operations. Additionally, it includes additional features such as thermal shutdown, current limiting, and overvoltage protection. Its working principle is based on an internal voltage reference and a pass element, and it is designed to provide constant output between 1.2 V and 10 V, depending on the device.

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