LM337IMP

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LM337IMP

+BOM

IC REG LIN NEG ADJ 1.5A SOT223-4

  • ManufacturerTexas Instruments

  • Mfr. Part #LM337IMP

  • In Stock7325

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Specifications

Attribute Value
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 -40°C ~ 125°C
Mounting Type Surface Mount
Package TO-261-4, TO-261AA
Supplier Device Package SOT-223-4
Packaging Cut Tape (CT), Tape & Reel (TR)

Overview

Description

The LM337IMP is a versatile, adjustable negative voltage regulator, commonly used in electronic circuits for voltage regulation. It can provide output voltages ranging from -1.2V to -37V with a load current of up to 1.5A, depending on the external resistor network used to set the desired voltage level. This device is a part of the LM337 series, known for its reliability and ease of use in various applications, including power supply design and voltage regulation systems.
The LM337IMP is often packaged in a TO-252 surface-mount package, which allows for efficient thermal management and space-saving in circuit design. Key features include internal current limiting, thermal overload protection, and safe area compensation, ensuring robust performance and protection against common faults. It is ideal for use in battery chargers, adjustable power supplies, and operational amplifier circuits. The LM337IMP's wide input voltage range and ability to handle temperature variations make it a popular choice for engineers seeking a dependable negative voltage regulation solution.

Equivalent

The LM337IMP is a negative voltage regulator. Equivalent products include the LM337 series from other manufacturers, such as the LM337T LM337S, and LM337L, which are available in different packages and current ratings. Additionally, you can consider the L79xx series, such as the L7905, L7912, or L7915, which are also negative voltage regulators with similar functionalities but different voltage outputs. Always verify the specifications and pin configurations to ensure compatibility.

Features

The LM337IMP is a versatile, adjustable negative voltage regulator. Key features include:
1. Output Voltage Range: It can adjust output voltages from -1.2V to -37V, providing flexibility for various applications.
2. Output Current: Capable of delivering up to 1.5A, suitable for moderate power needs.
3. Thermal Regulation: Includes features for thermal overload protection, maintaining stability and safety under high-temperature conditions.
4. Short-Circuit Protection: Safeguards against potential damage by limiting current under fault conditions.
5. Low Noise: Offers low output voltage noise, making it suitable for sensitive analog circuits.
6. Stable Performance: Provides excellent line and load regulation, ensuring consistent performance across varying input conditions and loads.
7. Compact Package: Available in small surface-mount packages like SOT-223, which is beneficial for space-constrained designs.
8. Ease of Use: Requires only two external resistors to set the output voltage, simplifying circuit design.
These features make the LM337IMP ideal for a wide range of applications requiring reliable negative voltage regulation.

Pinout

The LM337IMP is a three-terminal adjustable negative voltage regulator. It is typically available in a surface-mount SOT-223 package. The device has three pins:
1. Input (VIN): This pin receives the unregulated input voltage, which is typically more negative than the desired output voltage.
2. Output (VOUT): This pin provides the regulated negative output voltage. The voltage is adjustable using external resistors.
3. Adjust (ADJ): This pin is used to set the output voltage. By connecting a voltage divider between the output and this pin, the output voltage can be adjusted from -1.2V to -37V with reference to the input voltage.
The LM337IMP can supply up to 1.5 amps of current with proper heat sinking and is commonly used in applications requiring a stable and adjustable negative voltage.

Manufacturer

The LM337IMP is manufactured by Texas Instruments. Texas Instruments, often abbreviated as TI, is an American technology company headquartered in Dallas, Texas. It specializes in the design and manufacture of semiconductors and various integrated circuits, which are used in a wide range of electronic applications. TI is one of the largest manufacturers of analog technology components, and it also provides digital signal processors, microcontrollers, and other semiconductor solutions. The company serves a diverse set of industries including industrial, automotive, personal electronics, communications, and enterprise systems. Texas Instruments is known for its innovation and contributions to the electronics sector, with a strong emphasis on research and development to drive technological advancement.

Application

The LM337IMP is a negative voltage regulator used in various applications that require stable and adjustable negative voltage outputs. Common application areas include:
1. Power Supply Design: Used in creating adjustable power supply units for electronic devices.
2. Battery Chargers: Helps in providing a controlled charging voltage.
3. Analog Circuits: Supports operation by supplying consistent negative voltages in amplifiers and sensors.
4. Telecommunications: Utilized in equipment needing reliable negative voltage.
5. Test and Measurement Equipment: Provides precision voltage adjustments for testing environments.
6. Industrial Electronics: Ensures stable power delivery in control systems and automation devices.
The versatility of LM337IMP allows it to be used where voltage regulation and reliability are critical.

Package

The LM337IMP is typically available in a SOT-223 package type. This package is a small-outline transistor package suited for surface mounting, often used in voltage regulator applications for efficient heat dissipation and compact design.

Frequently Asked Questions


Q: What is the output voltage range of the LM337IMP?
A: It provides a negative adjustable output from -1.2V to -37V, requiring two external resistors to set the voltage.


Q: What is the maximum output current this regulator can deliver?
A: The LM337IMP can deliver up to 1.5A output current, suitable for moderate load requirements.


Q: What protection features does the LM337IMP include?
A: It includes over temperature protection and short circuit protection, ensuring reliable operation under fault conditions.


Q: What is the typical application for a negative adjustable regulator?
A: It is ideal for generating a negative rail in bipolar power supplies, audio circuits, or operational amplifier power systems.


Q: What is the input voltage limit for this device?
A: The maximum input voltage is -40V, so ensure the input negative supply does not exceed this absolute maximum rating.


Q: Can the LM337IMP be used in surface-mount designs?
A: Yes, it comes in a SOT-223-4 surface-mount package, making it suitable for compact PCB layouts.


Q: How do I set a specific negative output voltage with the LM337IMP?
A: Use two external resistors in a standard adjustable regulator configuration; the output equals -1.25V * (1 + R2/R1) plus the adjust pin current.


Q: Does this regulator have ripple rejection capability?
A: Yes, it features a PSRR of 60dB at 120Hz, effectively filtering input ripple for cleaner output.


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