LM2937IMP-12/NOPB

Current - Output:	400mA
Base Part Number:	LM2937
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 Temperature, Reverse Polarity, Short Circuit
Control Features:	--
PSRR:	--
Current - Supply (Max):	20mA
Current - Quiescent (Iq):	2mA
Series:	--
Voltage Dropout (Max):	1V @ 50mA
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	12V
Voltage - Input (Max):	26V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Active
Packaging:	Tape & Reel (TR)

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LM2937IMP-12/NOPB Application Field and Working Principle

Introduction

The LM2937IMP-12/NOPB is a linear voltage regulator integrated circuit (IC) designed and manufactured by Texas Instruments. It is part of the Power Management IC (PMIC) family and is often used to supply up to 650mA output current, with a fixed voltage of 12 volts. It features a thermal protection function that protects against excessive power dissipation during overloads, and a low drop-out voltage, which helps maximize efficiency. It also has a high ripple rejection rate and fast transient response that enable it to maintain its high performance over a wide range of load conditions. This article will discuss the application fields and working principle of the LM2937IMP-12/NOPB.

Application Fields

The LM2937IMP-12/NOPB is an ideal solution for those needing an output current of up to 650mA with a fixed voltage of 12V. It is often used for general direct current (DC) power supply applications, including instrumentation equipment, embedded controllers, motor drives, computer peripherals, automotive circuitry, and digital lighting.It is also used in audio systems as it can provide reliable, noise-free power. The circuit also has a high output voltage accuracy and low output voltage ripple, which makes it ideal for powering sensitive audio components such as amplifiers, to ensure optimum audio performance. The high ripple rejection rate of the LM2937IMP-12/NOPB also makes it useful for telecom switch-mode power supplies, as it ensures minimal interference with other electronic components. As mentioned above, the fast transient response helps to maintain the high performance even when there are sudden changes in load. This makes the circuit well suited for computer peripheral power supplies, as they are often subjected to sudden load changes.

Working Principle

The LM2937IMP-12/NOPB is a linear voltage regulator IC. It works by taking a higher input voltage (typically 25V range) and converting it to a lower, fixed output voltage (12V). This is done by using a voltage comparator circuit, which compares the input voltage to a constant reference voltage and produces a corresponding output.The circuit works as follows – the input voltage is fed into the voltage comparator which compares it to the reference voltage. The voltage comparator then turns on the internal PNP transistor, which provides a path for the current from the input voltage to the output voltage. This current is controlled by an adjustable current source, which is adjusted to a specific current that is required for the output voltage.In addition, the LM2937IMP-12/NOPB includes thermal protection, which prevents excessive power dissipation during overloads, as well as a low drop-out voltage, which helps to maximize efficiency. The design also includes an internal noise filter and EMI filter, which helps reduce interference, making it ideal for audio systems.

Conclusion

The LM2937IMP-12/NOPB is a linear voltage regulator IC designed and manufactured by Texas Instruments. It is often used to supply up to 650mA output current, with a fixed voltage of 12 volts, and is well suited for instrumentation equipment, embedded controllers, motor drives, computer peripherals, automotive circuitry, telecom switch-mode power supplies, and digital lighting. The voltage regulator works by taking a higher input voltage and converting it to a lower, fixed output voltage, using a voltage comparator and adjustable current source. The circuit also features a thermal protection function, low drop-out voltage, high output voltage accuracy, low output voltage ripple, and fast transient response, making it an ideal solution for a variety of applications.

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