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LM2991S
+BOMIC REG LIN NEG ADJ 1A DDPAK
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ManufacturerTexas Instruments
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Mfr. Part #LM2991S
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Package TO-263 (KTT)-5
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In Stock5555
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Specifications
| Attribute | Value |
| Package | Bulk,Tube |
| ProductStatus | Not For New Designs |
| OutputConfiguration | Negative |
| OutputType | Adjustable |
| NumberofRegulators | 1 |
| Voltage-Input(Max) | -26V |
| Voltage-Output(Min/Fixed) | -3V |
| Voltage-Output(Max) | -24V |
| VoltageDropout(Max) | 1V @ 1A |
| Current-Output | 1A |
| Current-Quiescent(Iq) | 0.7 mA |
| Current-Supply(Max) | 5 mA |
| PSRR | 60dB (1kHz) |
| ControlFeatures | Enable |
| ProtectionFeatures | Over Temperature, Short Circuit |
| OperatingTemperature | -40°C ~ 125°C |
| MountingType | Surface Mount |
| Package/Case | TO-263-6, D²Pak (5 Leads + Tab), TO-263BA |
Overview
Description
The LM2991S is a negative voltage regulator integrated circuit (IC) designed by Texas Instruments. It provides a regulated output voltage that can be adjusted between -3V and -24V, making it versatile for various applications requiring negative voltage supply. The IC can deliver an output current of up to 1.5A, suitable for powering medium-scale electronic projects or circuits.
Key features of the LM2991S include: high precision with a typical output voltage tolerance of 1%, low quiescent current, and a wide input voltage range, which helps in efficiently managing power consumption. The regulator is equipped with thermal shutdown and current limiting features to enhance the safety and reliability of the electronic systems it powers. The LM2991S also supports reverse polarity protection, safeguarding connected components from potential damage due to incorrect power supply connections.
This IC is typically packaged in a TO-263 or TO-220 form factor, allowing for easy mounting and heat dissipation. With its adjustable output and robust protection features, the LM2991S is commonly used in automotive, industrial, and consumer electronics applications.
Key features of the LM2991S include: high precision with a typical output voltage tolerance of 1%, low quiescent current, and a wide input voltage range, which helps in efficiently managing power consumption. The regulator is equipped with thermal shutdown and current limiting features to enhance the safety and reliability of the electronic systems it powers. The LM2991S also supports reverse polarity protection, safeguarding connected components from potential damage due to incorrect power supply connections.
This IC is typically packaged in a TO-263 or TO-220 form factor, allowing for easy mounting and heat dissipation. With its adjustable output and robust protection features, the LM2991S is commonly used in automotive, industrial, and consumer electronics applications.
Equivalent
The LM2991S is a low-dropout adjustable negative voltage regulator. Equivalent products include:
1. LT1963 (-5V version) by Analog Devices
2. TPS7A3301 by Texas Instruments
3. MIC5156-5.0 by Microchip Technology
These alternatives offer similar functionality, but it's important to check the specific electrical characteristics and package compatibility to ensure they meet your application requirements.
1. LT1963 (-5V version) by Analog Devices
2. TPS7A3301 by Texas Instruments
3. MIC5156-5.0 by Microchip Technology
These alternatives offer similar functionality, but it's important to check the specific electrical characteristics and package compatibility to ensure they meet your application requirements.
Features
The LM2991S is a versatile low dropout adjustable negative regulator that offers several features ideal for various applications. It provides an output voltage adjustable from -3V to -24V with a current capability of up to 1.5A. The regulator is designed for low dropout operation, with a maximum dropout voltage of 0.6V at full load, which enhances its efficiency.
Key features include:
1. Low dropout voltage: 0.6V max at 1.5A.
2. Adjustable output voltage: -3V to -24V.
3. High output current capability: Up to 1.5A.
4. Low quiescent current: Important for battery-powered applications.
5. Overtemperature and overcurrent protection: Ensures reliable operation.
6. Wide input voltage range: -26V to -3V.
7. Low output voltage noise: Suitable for sensitive applications.
8. Reverse polarity protection: Safeguards the device against negative voltage.
These features make the LM2991S ideal for use in automotive, industrial, and general-purpose applications where a stable negative voltage supply is required.
Key features include:
1. Low dropout voltage: 0.6V max at 1.5A.
2. Adjustable output voltage: -3V to -24V.
3. High output current capability: Up to 1.5A.
4. Low quiescent current: Important for battery-powered applications.
5. Overtemperature and overcurrent protection: Ensures reliable operation.
6. Wide input voltage range: -26V to -3V.
7. Low output voltage noise: Suitable for sensitive applications.
8. Reverse polarity protection: Safeguards the device against negative voltage.
These features make the LM2991S ideal for use in automotive, industrial, and general-purpose applications where a stable negative voltage supply is required.
Pinout
The LM2991S is a negative low-dropout voltage regulator with a variable output. It comes in a TO-263 package. The pin count and functions for the LM2991S are as follows:
1. Input (Pin 1): This is the pin where the negative input voltage is supplied.
2. Ground (Pin 2): This pin is connected to the ground or common reference point.
3. Output (Pin 3): The regulated negative output voltage is obtained from this pin.
4. Sense (Pin 4): This pin is used to improve load regulation. It should be connected to the load for optimal performance.
5. Shutdown (Pin 5): This pin allows the regulator to be turned on or off. Applying a high logic level turns the regulator off, and a low turns it on.
The typical applications for the LM2991S include systems requiring negative voltage regulation like operational amplifier power supplies and battery-powered devices.
1. Input (Pin 1): This is the pin where the negative input voltage is supplied.
2. Ground (Pin 2): This pin is connected to the ground or common reference point.
3. Output (Pin 3): The regulated negative output voltage is obtained from this pin.
4. Sense (Pin 4): This pin is used to improve load regulation. It should be connected to the load for optimal performance.
5. Shutdown (Pin 5): This pin allows the regulator to be turned on or off. Applying a high logic level turns the regulator off, and a low turns it on.
The typical applications for the LM2991S include systems requiring negative voltage regulation like operational amplifier power supplies and battery-powered devices.
Manufacturer
The LM2991S is manufactured by Texas Instruments (TI), a global semiconductor company. Texas Instruments is known for designing and manufacturing a wide range of integrated circuits and semiconductor technologies, focusing on analog chips, embedded processors, and other electronic components used in a variety of applications across industries like automotive, industrial, personal electronics, and communications. The company has a strong reputation for innovation and quality in the electronics industry, serving a diverse global customer base.
Application
The LM2991S is a low dropout adjustable voltage regulator commonly used in applications requiring efficient power regulation. Its main application areas include power supply regulation for microcontrollers, sensors, and communication devices. It's particularly useful in automotive and industrial environments due to its wide input voltage range and robust performance. The LM2991S can also be employed in battery-powered devices where low dropout voltage is crucial for maximizing battery life. Its ability to provide a stable output voltage makes it suitable for precision analog circuits and instrumentation. Additionally, it can be used in post-regulation of switching supplies to improve output voltage accuracy and noise performance.
Package
The LM2991S is a low dropout adjustable negative voltage regulator. It is typically available in a TO-263 package, which is a surface-mount package also known as D²PAK.
