L78L33ABD-TR

Current - Output:	100mA
Base Part Number:	L78L33A
Supplier Device Package:	8-SO
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Protection Features:	Over Current, Over Temperature, Short Circuit
Control Features:	--
PSRR:	49dB (120Hz)
Current - Supply (Max):	6mA
Current - Quiescent (Iq):	5.5mA
Series:	--
Voltage Dropout (Max):	--
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	3.3V
Voltage - Input (Max):	30V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

The L78L33ABD-TR is a low-dropout three-terminal voltage regulator with an output voltage of 3.3V. This Regulator is specifically designed for low power voltage regulation and is packaged in a small 8-pin SOIC package. It is part of the Linear Regulator family of Voltage Regulators offered by Texas Instruments.The device is robust, reliable and can be used in a variety of different applications, including those in industrial, automotive and electronic devices. The device features a wide operating temperature range, low stand-by current, and high current capability. In addition, it has a low drop-out voltage, and is very efficient, offering a high power saving compared to other Voltage Regulators. This makes it a very suitable choice for a wide range of applications.

Application Field

The primary application for the L78L33ABD-TR is to provide a regulated voltage source for low power, low voltage, and low current applications. It is well-suited for powering microprocessors, DSPs, SRAMs, and other low power, low voltage devices. Its low dropout voltage allows voltage regulation over a wide input voltage range, from 2V up to 20V, while maintaining a 3.3V output voltage. In addition, the device is also suitable for powering multiple low-power components such as radios, microphones, sensors, LEDs, and more.The device can also be used in automotive applications. It is ideal for powering airbag systems, instrument clusters, body control modules and more. Its high efficiency allows it to reduce the amount of power consumption, making it ideal for powering automotive components.

Working Principle

The working principle of the L78L33ABD-TR is based on the regulated output of 3.3V. The device is designed to maintain a constant output voltage in the range of 2V to 20V, regardless of the variations in the input voltage. It does this by using a series of components working together to create a circuit to regulate the input voltage to the 3.3V output. The first component is an N-channel MOSFET, which works to reduce the voltage from the input source to the 3.3V output voltage set on the device. The MOSFET is connected to the output and the adjustment pins of the device. The adjustment pin is used to set the required output voltage, while the MOSFET is used to regulate the output voltage.The second component is a series of transistors connected in a Series-Shunt configuration. This configuration allows the current to flow through the transistor pair to regulate the voltage, while at the same time excluding the current from being diverted away from the load. The transistors work together to regulate the voltage by shunting excess current away from the load, and regulating the current flowing from the power source.Finally, the third component is an operational amplifier. This is compared to the reference voltage to ensure that the output voltage is maintained at the specified value. The operational amplifier measures the output voltage and compares it to the reference voltage, adjusting the output accordingly. The output voltage is monitored continuously and the output voltage is maintained at its specified value.

Conclusion

The L78L33ABD-TR is a low-dropout three-terminal voltage regulator with an output voltage of 3.3V. This device is part of the Linear Regulator family of Voltage Regulators offered by Texas Instruments. It is well-suited for powering microprocessors, DSPs, SRAMs, and other low power, low voltage devices, and is also suitable for powering multiple low-power components such as radios, microphones, sensors, LEDs, and more. The device is designed to maintain a constant output voltage in the range of 2V to 20V, regardless of the variations in the input voltage, and it does this by using a series of components working together to create a circuit to regulate the input voltage to the 3.3V output. In conclusion, the L78L33ABD-TR offers an efficient, reliable, and robust voltage regulation solution for a variety of different applications.

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