LM337T

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LM337T

+БОМ

IC REG LIN NEG ADJ 1.5A TO220-3

  • ПроизводительОнсеми

  • Мфр. Часть #LM337T

  • В наличии4368

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Спецификации

Атрибут Ценность
Part Status Obsolete
Base Product Number LM337
Output Configuration Negative
Output Type Adjustable
Number of Regulators 1
Voltage - Input (Max) -40V
Voltage - Output (Min/Fixed) -1.2V
Voltage - Output (Max) -37V
Current - Output 1.5A
PSRR 60dB (120Hz)
Protection Features Over Temperature, Short Circuit
Operating Temperature 0°C ~ 125°C
Mounting Type Through Hole
Package TO-220-3
Supplier Device Package TO-220-3
Packaging Tube

Обзор

Description

The LM337T is a popular adjustable negative voltage regulator used in electronic circuits to provide a stable output voltage. It is part of the LM337 series and is designed for applications requiring negative voltage regulation. The device can output voltages ranging from -1.2V to -37V, with a current output capability of up to 1.5A, making it versatile for various power supply needs.
Key features of the LM337T include short-circuit protection, thermal overload protection, and a safe operating area (SOA) protection, ensuring reliable performance even under challenging conditions. The regulator requires only two external resistors to set the output voltage, offering ease of use.
Typically used in power supplies, the LM337T can be paired with its positive counterpart, the LM317, to create dual rail power supplies. Its TO-220 package allows for easy heat dissipation, but a heatsink may be necessary for higher current applications. Overall, the LM337T is valued for its flexibility, reliability, and simplicity in negative voltage regulation tasks.

Equivalent

The LM337T is a negative adjustable voltage regulator. Equivalent products include the L79xx series (e.g., L7905, L7912), the UA79xx series, and other equivalents like the LT1033, MC7912, and NTE956. These components have similar functionality and electrical characteristics, allowing them to be used as substitutes in various applications requiring negative voltage regulation. Always check the datasheets to ensure compatibility in terms of output voltage and current requirements for your specific application.

Features

The LM337T is a versatile negative voltage regulator. Its key features include:
1. Adjustable Output Voltage: Ranges from -1.2V to -37V, providing flexibility for various applications.
2. Output Current: Capable of delivering up to 1.5A, suitable for medium power requirements.
3. Line Regulation: Typically 0.01%/V, ensuring stable performance with varying input voltages.
4. Load Regulation: Approximately 0.3%, which helps maintain constant output despite load changes.
5. Thermal Overload Protection: Prevents damage from overheating by shutting down under excessive temperature conditions.
6. Short-Circuit Protection: Safeguards the device against current overloads.
7. Safe Area Compensation: Ensures reliable performance over a wide temperature range.
8. Standard TO-220 Package: Facilitates easy integration into designs.
9. Low Quiescent Current: Enhances efficiency by minimizing power loss.
These features make the LM337T suitable for a wide range of applications, including power supply circuits, battery chargers, and other systems requiring stable negative voltage regulation.

Pinout

The LM337T is a three-terminal adjustable negative voltage regulator. It is commonly used to provide a stable negative output voltage ranging from -1.2V to -37V, with a current output capability of up to 1.5A. The component is available in a TO-220 package.
The pin configuration for the LM337T is as follows:
1. Input (Pin 1): This is the terminal where the negative input voltage is applied. It is connected to the unregulated input supply.
2. Output (Pin 2): This is the terminal where the regulated negative output voltage is obtained. It provides the stabilized voltage to the load.
3. Adjust (Pin 3): This pin is used to set the output voltage. By connecting this pin to a resistor divider network, users can adjust the output voltage to the desired level.
The LM337T is often used in power supply circuits where a stable negative voltage is required. Proper heat sinking is recommended to maintain thermal stability and ensure reliable operation.

Manufacturer

The LM337T is a voltage regulator typically manufactured by several semiconductor companies, including Texas Instruments, STMicroelectronics, and ON Semiconductor, among others. These companies are major players in the electronics and semiconductor industry, producing a wide range of integrated circuits and electronic components.
Texas Instruments (TI) is an American technology company that designs and manufactures semiconductors and various integrated circuits, which are widely used in electronics applications globally. TI is known for its extensive range of analog chips and embedded processors.
STMicroelectronics is a global semiconductor company with French-Italian roots, known for producing a variety of electronic components, including microcontrollers, sensors, and power management devices.
ON Semiconductor (now known as onsemi) is an American semiconductor supplier company, focusing on efficient power and sensing technologies for various industries, including automotive, industrial, and communications.
These companies are recognized for their contributions to advancements in electronics and technology, and they provide components that are crucial for developing a wide array of electronic devices and systems.

Application

The LM337T is a versatile adjustable negative voltage regulator used in various applications. It is commonly employed in power supply circuits to provide a stable negative voltage output, adjustable between -1.2V to -37V. Its key applications include powering operational amplifiers, analog circuits, and digital logic circuits that require a negative voltage. Additionally, it is used in battery chargers, variable power supplies, and as a part of dual rail power supplies. The LM337T's ability to handle up to 1.5A of current and its thermal overload and short circuit protection make it suitable for both consumer electronics and industrial applications.

Package

The LM337T is a voltage regulator that typically comes in a TO-220 package. This package type is commonly used for power transistors and voltage regulators, providing good heat dissipation through its metal tab, which can be attached to a heatsink.

Frequently Asked Questions


Q: What is the maximum input voltage for the LM337T?
A: The maximum input voltage is -40V, making it suitable for applications requiring a negative supply rail up to that level.


Q: Can the LM337T provide a fixed output voltage?
A: Yes, but only with external resistors; the minimum fixed output is -1.2V, and it is adjustable up to -37V.


Q: What is the output current capability of this regulator?
A: It can deliver up to 1.5A of continuous output current for negative voltage regulation.


Q: Does the LM337T include protection features?
A: Yes, it integrates over-temperature shutdown and short-circuit protection to enhance system reliability.


Q: What is the typical PSRR performance of this part?
A: It offers a power supply rejection ratio (PSRR) of 60dB at 120Hz, ensuring good ripple rejection.


Q: Is the LM337T in a through-hole package for prototyping?
A: Yes, it is housed in a TO-220-3 through-hole package, ideal for breadboard and manual assembly.


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