LM2991T

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LM2991T

IC REG LIN NEG ADJ 1A TO220-5

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規格

Part Status Obsolete
Base Product Number LM2991
Output Configuration Negative
Output Type Adjustable
Number of Regulators 1
Voltage - Input (Max) -26V
Voltage - Output (Min/Fixed) -3V
Voltage - Output (Max) -24V
Voltage Dropout (Max) 1V @ 1A
Current - Output 1A
Current - Quiescent (Iq) 0.7 mA
Current - Supply (Max) 5 mA
PSRR 60dB (1kHz)
Control Features Enable
Protection Features Over Temperature, Short Circuit
Operating Temperature -40°C ~ 125°C
Mounting Type Through Hole
Package TO-220-5
Supplier Device Package TO-220-5
Packaging Tube

概述

Description

The LM2991T is a precision voltage reference and regulator designed for use in various electronic applications. It provides a stable and accurate output voltage, typically 1.25V, with minimal temperature dependence and excellent load and line regulation. This device is ideal for use in power supplies, analog-to-digital converters, and as a reference voltage for operational amplifiers.
Key features of the LM2991T include low output noise, high accuracy, and the capability to operate over a wide temperature range. It has a built-in short-circuit protection and thermal shutdown, enhancing its reliability in demanding environments. The LM2991T is typically available in a TO-220 package, allowing for easy integration into circuit designs.
Its applications span consumer electronics, industrial equipment, and instrumentation, where maintaining precise voltage levels is crucial for performance and accuracy. Overall, the LM2991T is a versatile component for designers seeking a dependable voltage reference solution.

Features

The LM2991T is a voltage regulator with several key features:
1. Voltage Regulation: It provides a stable output voltage with minimal variations, ensuring reliable operation of connected devices.
2. Wide Input Voltage Range: The device can operate over a broad input voltage range, typically from 4.0V to 40V, making it versatile for various applications.
3. Output Current: It can supply a maximum output current of up to 1.0A, suitable for powering multiple components.
4. Thermal Protection: The LM2991T incorporates thermal overload protection, preventing damage from overheating.
5. Short-Circuit Protection: It features short-circuit protection, enhancing safety in case of faults in the load.
6. Low Dropout Voltage: The low dropout voltage allows for efficient operation with minimal voltage headroom.
7. Compact Package: Available in a TO-220 package, it is designed for easy integration into circuits while minimizing space.
These features make the LM2991T ideal for various applications, including power supplies, automotive systems, and industrial equipment.

Package

The LM2991T is available in a TO-220 package type, which is a plastic package designed for power devices, providing good thermal performance and ease of mounting.

Pinout

The LM2991T is a voltage regulator integrated circuit with a pin count of 8. Its primary function is to provide a stable reference voltage and regulate output voltage.
The pin configuration is as follows:
1. Input (Vin): Connects to the input voltage source.
2. Output (Vout): Delivers the regulated output voltage.
3. Ground (GND): Common ground connection.
4. Feedback (FB): Used for voltage feedback to maintain stability.
5. Adjust (Adj): Adjusts the output voltage level.
6. Shutdown (SHDN): Enables or disables the device.
7. Compensation (Comp): For external compensation to optimize performance.
8. Bypass (Bypass): For noise reduction and to improve transient response.
The LM2991T is commonly utilized in applications requiring precise voltage regulation, such as power supplies and portable devices.

Manufacturer

The LM2991T is manufactured by Texas Instruments (TI), a well-known American technology company. Texas Instruments specializes in semiconductor design and manufacturing, focusing on analog and embedded processing products. Founded in 1930, TI is a leader in the semiconductor industry, producing a wide range of components including microcontrollers, digital signal processors, and analog devices. The company serves various sectors, including automotive, industrial, and consumer electronics, emphasizing innovation and efficiency in electronic design.

Application

The LM2991T is a precision voltage reference used primarily in applications such as:
1. Voltage Regulation: Provides stable reference voltage for power supplies.
2. Data Acquisition Systems: Ensures accurate measurements in ADCs.
3. Instrumentation: Used in sensor interfaces and measurement devices.
4. Medical Equipment: Critical in devices requiring precise voltage for operation.
5. Consumer Electronics: Improves performance in audio and video equipment.
Its stability and accuracy make it suitable for any application needing a reliable voltage reference.

Equivalent

The LM2991T is a voltage regulator, specifically a low dropout (LDO) linear voltage regulator. Equivalent products include the LM317, LM1117, and LP2950. Other alternatives may include the MIC2941 and TPS7A47, depending on the specific voltage and current requirements. Always check the datasheets for compatibility in terms of specifications and application conditions.

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