STMicroelectronics
画像はイメージの場合もございます。
商品詳細は仕様をご覧ください。
L4949E
詳細を表示 DataSheets

L4949E

Product Overview

Category

L4949E belongs to the category of voltage regulators.

Use

It is commonly used for regulating voltage in electronic circuits.

Characteristics

  • High precision and stability
  • Low dropout voltage
  • Overcurrent and thermal protection
  • Adjustable output voltage
  • Wide input voltage range

Package

L4949E is available in a TO-220 package.

Essence

The essence of L4949E lies in its ability to provide a regulated output voltage despite fluctuations in the input voltage.

Packaging/Quantity

L4949E is typically sold in reels or tubes, with quantities varying depending on the supplier.

Specifications

  • Input Voltage Range: 4.5V to 40V
  • Output Voltage Range: 2.85V to 36V
  • Dropout Voltage: 0.6V (typical)
  • Output Current: Up to 1A
  • Quiescent Current: 10mA (typical)
  • Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

L4949E has the following pin configuration:

  1. GND (Ground)
  2. Vout (Output Voltage)
  3. Vin (Input Voltage)
  4. ADJ (Adjustment)

Functional Features

  • High Precision: L4949E provides precise and stable output voltage regulation.
  • Low Dropout Voltage: The regulator maintains a low voltage drop between the input and output, ensuring efficient power conversion.
  • Overcurrent and Thermal Protection: It incorporates protection mechanisms to prevent damage from excessive current or temperature.
  • Adjustable Output Voltage: The output voltage can be adjusted within a specified range using an external resistor.
  • Wide Input Voltage Range: L4949E can handle a wide range of input voltages, making it versatile for various applications.

Advantages and Disadvantages

Advantages

  • High precision and stability ensure reliable voltage regulation.
  • Low dropout voltage minimizes power loss.
  • Overcurrent and thermal protection enhance safety and durability.
  • Adjustable output voltage allows flexibility in design.
  • Wide input voltage range accommodates diverse applications.

Disadvantages

  • Limited output current capacity (up to 1A).
  • Requires an external resistor for adjusting the output voltage.

Working Principles

L4949E operates based on a linear voltage regulator principle. It utilizes a pass transistor to regulate the output voltage by adjusting the resistance between the input and output terminals. The internal circuitry monitors the input and output voltages, ensuring that the desired output voltage is maintained within specified tolerances.

Detailed Application Field Plans

L4949E finds applications in various fields, including but not limited to: - Power supply units - Battery charging circuits - Automotive electronics - Industrial control systems - Consumer electronics

Detailed and Complete Alternative Models

Some alternative models to L4949E include: - LM317 - LM7805 - LT1084 - LM1117 - LM2940

These alternatives offer similar functionality and can be used as substitutes depending on specific requirements and availability.

Word count: 334 words

技術ソリューションにおける L4949E の適用に関連する 10 件の一般的な質問と回答をリストします。

Sure! Here are 10 common questions and answers related to the application of L4949E in technical solutions:

  1. Q: What is L4949E? A: L4949E is a voltage regulator IC (integrated circuit) commonly used in technical solutions to regulate and stabilize voltage levels.

  2. Q: What is the input voltage range for L4949E? A: The input voltage range for L4949E is typically between 5V and 40V.

  3. Q: What is the output voltage range for L4949E? A: The output voltage range for L4949E can be adjusted from 2.85V to 35V using external resistors.

  4. Q: What is the maximum output current of L4949E? A: The maximum output current of L4949E is 1.5A, which makes it suitable for powering various electronic components.

  5. Q: Can L4949E handle short-circuit conditions? A: Yes, L4949E has built-in protection features that allow it to handle short-circuit conditions without getting damaged.

  6. Q: Is L4949E suitable for automotive applications? A: Yes, L4949E is designed to meet the requirements of automotive applications, making it suitable for use in vehicles.

  7. Q: Does L4949E have thermal shutdown protection? A: Yes, L4949E incorporates thermal shutdown protection, which prevents the IC from overheating under excessive load or high ambient temperatures.

  8. Q: Can L4949E operate in a wide temperature range? A: Yes, L4949E is designed to operate in a wide temperature range, typically from -40°C to +150°C.

  9. Q: Does L4949E require external components for operation? A: Yes, L4949E requires a few external components such as capacitors and resistors to function properly in a voltage regulation circuit.

  10. Q: What are the typical applications of L4949E? A: L4949E is commonly used in various technical solutions, including automotive electronics, industrial control systems, power supplies, and battery charging circuits.

Please note that these answers are general and may vary depending on specific datasheet specifications and application requirements.