LM2940IMPX-10

Current - Output:	1A
Base Part Number:	LM2940
Supplier Device Package:	SOT-223-4
Package / Case:	TO-261-4, TO-261AA
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C
Protection Features:	Over Current, Over Temperature, Reverse Polarity, Short Circuit
Control Features:	--
PSRR:	63dB (120Hz)
Current - Supply (Max):	15mA
Current - Quiescent (Iq):	10mA
Series:	--
Voltage Dropout (Max):	1V @ 1A
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	10V
Voltage - Input (Max):	26V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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LM2940IMPX-10 – Application Field and Working Principle

LM2940IMPX-10 is a linear voltage regulator from LM series of Texas Instruments that find various applications in power line monitoring and post regulation. This three terminal regulator IC is designed to operate within an input voltage range of 6V to 36V. It is capable of controlling a power output of up to 1.5A with an accuracy of ±3%. The IC is specified over an operating temperature range of -40°C to 125°C and comes with in-built protection features like over current and thermal shutdown. LM2940IMPX-10 offers overcurrent protection, dropout voltage of 0.9V, current limit of 3A and thermal limit of 120oC.

Applications

The LM2940IMPX-10 Voltage Regulator is ideal for applications such as distributed power systems, battery pack charger, DC-to-DC converters, motor drivers and various post regulation applications. With input voltage range of up to 36V and output voltage range between 1.2V to 37V, the LM2940IMPX-10 Voltage Regulator can be used for regulating power output even on higher voltage source and for wide variety of post regulation applications.

Working Principle

The LM2940IMPX-10 Voltage Regulator is an integrated circuit containing three terminal and two transistors, enabling the user to regulate the voltage and current of a power supply. Generally, it is operated with a range of input voltage and current. The voltage regulator further ensures that within the specified range and accuracy, the output voltage remains constant even when the input voltage or current fluctuates. The two transistors present in the IC are arranged in series, which are the Difference Amplifier (DA) and the Power Amplifier (PA) stages along with a Voltage Reference Source (VREF). During normal operation, the voltage supplied to the non-inverting input of the DA is compared to the VREF and it triggers the charge pump and current amplifier when the voltage at the non-inverting input falls below VREF. This comparator controls the voltage output with the built-in charge pump to provide the necessary drain current to the PA. The Power Amplifier stage amplifies the current to the maximum level needed for output gain, to the point when enough current reaches the output stage, providing the desired output voltage. This process is repeated and regulated, so that the output voltage remains unchanged even when the input voltage or current changes. In addition to regulating the voltage, the LM2940IMPX-10 is capable of doubling the output voltage by passing the current through a high-value resistor. This makes it possible to drive high-power loads such as relay coils, motors, and transformers. The LM2940IMPX-10 Voltage Regulator also has built-in current and thermal protection, which prevents overcurrent and over-temperature conditions. The current limit is typically limited up to 3A and the thermal limit is up to 120°C. Both the limits can be adjusted with external components.

Conclusion

The LM2940IMPX-10 is a linear voltage regulator with an input voltage range of 6V to 36V. It offers current up to 1.5A with accuracy ±3%. It has overcurrent protection, dropout voltage of 0.9V, current limit of 3A and thermal limit of 120oC. The regulator is an ideal choice for post regulation and power line monitoring applications as it is stable, accurate, and reliable. It also provides overcurrent and thermal protection, and is capable of producing output voltage up to 37V. The voltage regulator can be used to drive high-power loads, such as relay coils, motors and transformers, with the help of external components. ：PMIC - Voltage Regulators - Linear

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