L78M05ABV-DG

Series:	--
Packaging:	Tube
Part Status:	Active
Output Configuration:	Positive
Output Type:	Fixed
Number of Regulators:	1
Voltage - Input (Max):	35V
Voltage - Output (Min/Fixed):	5V
Voltage - Output (Max):	--
Voltage Dropout (Max):	--
Current - Output:	500mA
Current - Quiescent (Iq):	6mA
PSRR:	62dB (120Hz)
Control Features:	--
Protection Features:	Over Current, Over Temperature, Short Circuit
Operating Temperature:	-40°C ~ 125°C
Mounting Type:	Through Hole
Package / Case:	TO-220-3
Supplier Device Package:	TO-220
Base Part Number:	L78M05

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Introduction

The L78M05ABV-DG is a linear voltage regulator from STMicroelectronics that is designed for basic component level power management in tiny and space-constrained applications. It is an easy to use and low-cost voltage regulator solution that has both an adjustable and a fixed pre-set output as an option. The L78M05ABV-DG is a 3-Terminal Low Dropout (LDO) regulator with a fixed output voltage of 5V, an extended operating temperature range of -40°C to 85°C, and a maximum output current of up to 1.5A. It is available in the form of an 7-pin SOT-89 (TO-220) surface mounted devices (SMD). In this article, we will discuss the application field of the STMicroelectronics L78M05ABV-DG, as well as its working principle.

Application Field

The STMicroelectronics L78M05ABV-DG Linear Voltage Regulator is designed for use in a wide variety of power management applications. It is specifically tailored for small and space-constrained applications, as well as cost-sensitive, low-power solutions. It is suitable for personal computers, coolers, air conditioners, refrigerators, solenoids and electric motors, small LCD displays, and cellular phones. Aside from these applications, it can also be used in automotive applications and other battery-operated products that require a 5V power supply.

Working Principle

The STMicroelectronics L78M05ABV-DG Linear Voltage Regulator operates using a simplified two-terminal voltage regulator circuit that provides a regulated output of 5V based on an input voltage range of 3V to 40V. It utilizes an internal power switch and a simple external circuit configuration to provide overvoltage and reverse polarity protection. This allows it to provide accurate and stable 5V power even with fluctuating input voltages. Additionally, it also provides temperature compensation, high voltage standing surge and transient protection, as well as low noise performance.The internal reference voltage (Vref) of the L78M05ABV-DG is derived from a precision band gap circuit of 1.25V, which is combined with an output error amplifier, internal linear regulator, and adjustable current limit circuitry. This is then connected to the output via the power switch, which is controlled by the current limit. This results into a regulated 5V output voltage even with a wide range of input line voltages, load current, and temperatures.

Conclusion

The STMicroelectronics L78M05ABV-DG Linear Voltage Regulator is an easy to use, low-cost solution for basic component level power management in tiny and space-constrained applications. It is ideal for applications that require an adjustable and fixed pre-set voltage, as well as overvoltage and reverse polarity protection. It utilizes a two-terminal voltage regulator circuit that provides a regulated output of 5V based on an input voltage range of 3V to 40V. It can also provide temperature compensation, high voltage standing surge and transient protection, as well as low noise performance.

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