LM2941CT

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Introduction to LM2941CT

The LM2941CT is a low dropout linear voltage regulator IC (LVR IC) for use in the power management of small electronic devices. It features very low quiescent current when operating at typical output voltages, making it an ideal choice for battery-operated applications.

The output voltage range of the LM2941CT is adjustable between 1.2V and 15V for fixed output voltage versions. The device also offers over-current (OC) and thermal protection which makes it suitable for use in a broad range of power management applications.

Applications

• Battery-operated portable devices
• Automotive systems
• Automotive accessories such as LED lights
• Hi-fi audio systems
• MP3 players
• Game consoles

Features

• Ultra low quiescent current (typical 2.0mA)
• Low dropout voltage (droop of 85mV at 1A)
• Output voltage range adjustable between 1.2V and 15V.
• Over-current protection
• Thermal protection
• Validated to ±0.3% accuracy between 0.1V and 7V
• RoHS compliant

Working Principle

The LM2941CT is a linear voltage regulator integrated circuit (IC) with an input in the range of 3V to 28V and an adjustable output voltage between 1.2V and 15V. It is capable of supplying up to 500mA of current and has very low quiescent current in operation.

The LM2941CT is a low dropout voltage regulator, meaning that it can maintain the regulated output voltage across a wide input voltage range with only a small differential voltage across the regulator. It achieves this through a clever design that uses fewer components than other regulators.

The LM2941CT is composed of a series pass element, a power input stage, a protection circuit, and a voltage reference. The series pass element is the core of the regulator, and it is designed to maintain a constant current through itself while allowing a variable voltage drop.

The power input stage is used to convert the voltage supplied at the input to the voltage required by the series pass element and other components of the regulator. This stage includes a voltage divider with two resistors to reduce the power dissipation due to the overvoltage input.

The protection circuit is used to ensure that the device does not experience any overcurrent or thermal problems. It includes circuits for over-voltage protection, overcurrent protection, and thermal protection.

The voltage reference is used to provide reference voltage to other components of the regulator and maintain the regulated output voltage. It is composed of a temperature compensated bandgap reference circuit and a comparator.

The LM2941CT is a versatile device and is suitable for a wide range of applications. It is particularly suitable for applications that require low quiescent current, such as battery-powered devices, automotive accessories, and hi-fi audio systems.

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