Exar Corporation
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SPX3940AT-L-1-8
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SPX3940AT-L-1-8

Product Overview

Category

The SPX3940AT-L-1-8 belongs to the category of low-dropout voltage regulators.

Use

It is used to regulate and maintain a stable output voltage in various electronic circuits.

Characteristics

  • Low dropout voltage
  • High accuracy
  • Thermal shutdown protection
  • Short-circuit protection

Package

The SPX3940AT-L-1-8 is available in a TO-220 package.

Essence

This voltage regulator is essential for ensuring stable power supply in electronic devices.

Packaging/Quantity

The SPX3940AT-L-1-8 is typically packaged in reels or tubes, with quantities varying based on manufacturer specifications.

Specifications

  • Input Voltage Range: 4.5V to 30V
  • Output Voltage: 1.8V
  • Maximum Output Current: 1A
  • Dropout Voltage: 0.5V at 1A
  • Operating Temperature Range: -40°C to 125°C

Detailed Pin Configuration

The SPX3940AT-L-1-8 has a standard three-pin configuration: 1. Input (VIN) 2. Ground (GND) 3. Output (VOUT)

Functional Features

  • Low Dropout Voltage: Ensures efficient regulation even when the input voltage is only slightly higher than the output voltage.
  • Thermal Shutdown Protection: Prevents the device from overheating under excessive operating conditions.
  • Short-Circuit Protection: Safeguards the circuitry from damage in case of a short circuit.

Advantages and Disadvantages

Advantages

  • High accuracy in voltage regulation
  • Wide input voltage range
  • Robust thermal and short-circuit protection

Disadvantages

  • Relatively limited maximum output current compared to some alternatives
  • Higher dropout voltage compared to newer LDO regulators

Working Principles

The SPX3940AT-L-1-8 operates by comparing the output voltage to a reference voltage and adjusting the pass transistor to maintain a constant output voltage despite variations in the input voltage and load conditions.

Detailed Application Field Plans

The SPX3940AT-L-1-8 is commonly used in applications such as: - Battery-powered devices - Automotive electronics - Industrial control systems

Detailed and Complete Alternative Models

Some alternative models to the SPX3940AT-L-1-8 include: - LM2940 - LT1763 - MIC29302

In conclusion, the SPX3940AT-L-1-8 is a reliable low-dropout voltage regulator with robust features suitable for various electronic applications, especially those requiring stable and accurate voltage regulation.

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Перелічіть 10 типових запитань і відповідей, пов’язаних із застосуванням SPX3940AT-L-1-8 у технічних рішеннях

  1. What is the input voltage range for SPX3940AT-L-1-8?

    • The input voltage range for SPX3940AT-L-1-8 is 4.5V to 30V.

  2. What is the output voltage of SPX3940AT-L-1-8?

    • The output voltage of SPX3940AT-L-1-8 is fixed at 1.8V.

  3. What is the maximum output current of SPX3940AT-L-1-8?

    • The maximum output current of SPX3940AT-L-1-8 is 1A.

  4. Is SPX3940AT-L-1-8 a linear regulator or a switching regulator?

    • SPX3940AT-L-1-8 is a low-dropout (LDO) linear regulator.

  5. Does SPX3940AT-L-1-8 require an external capacitor for stability?

    • Yes, SPX3940AT-L-1-8 requires an external capacitor for stability.

  6. What is the typical dropout voltage of SPX3940AT-L-1-8?

    • The typical dropout voltage of SPX3940AT-L-1-8 is 300mV at 1A load.

  7. Can SPX3940AT-L-1-8 handle thermal shutdown?

    • Yes, SPX3940AT-L-1-8 has built-in thermal shutdown protection.

  8. What is the operating temperature range of SPX3940AT-L-1-8?

    • The operating temperature range of SPX3940AT-L-1-8 is -40°C to 125°C.

  9. Is SPX3940AT-L-1-8 suitable for battery-powered applications?

    • Yes, SPX3940AT-L-1-8 is suitable for battery-powered applications due to its low dropout voltage and low quiescent current.

  10. Does SPX3940AT-L-1-8 have short-circuit protection?

    • Yes, SPX3940AT-L-1-8 incorporates short-circuit current limiting and thermal overload protection.