STMicroelectronics
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L7985
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L7985

Product Overview

  • Category: Integrated Circuit (IC)
  • Use: Voltage Regulator
  • Characteristics:
    • High efficiency
    • Low dropout voltage
    • Adjustable output voltage
  • Package: TO-220
  • Essence: Linear voltage regulator
  • Packaging/Quantity: Available in reels of 2500 units

Specifications

  • Input Voltage Range: 4.2V to 28V
  • Output Voltage Range: 1.2V to 26V
  • Maximum Output Current: 5A
  • Dropout Voltage: 400mV at 5A
  • Line Regulation: ±0.05% typical
  • Load Regulation: ±0.3% typical
  • Quiescent Current: 100µA typical
  • Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The L7985 IC has the following pin configuration:

  1. GND (Ground)
  2. VIN (Input Voltage)
  3. VOUT (Output Voltage)
  4. BYPASS (Bypass Capacitor)
  5. ADJ (Adjustment Pin)

Functional Features

  • High efficiency, ensuring minimal power dissipation
  • Low dropout voltage, allowing operation with low input-output voltage differentials
  • Adjustable output voltage, providing flexibility for various applications
  • Overcurrent and thermal protection for enhanced reliability
  • Fast transient response for stable output voltage during load variations

Advantages and Disadvantages

Advantages: - High efficiency results in reduced power consumption - Wide input voltage range allows compatibility with various power sources - Adjustable output voltage provides versatility - Robust protection features enhance reliability

Disadvantages: - Linear regulators are less efficient compared to switching regulators - Limited maximum output current compared to some other voltage regulators

Working Principles

The L7985 is a linear voltage regulator that operates by maintaining a constant output voltage regardless of changes in the input voltage or load conditions. It achieves this by using a pass transistor to regulate the output voltage based on feedback from the ADJ pin. The internal circuitry ensures stable operation and protection against overcurrent and thermal events.

Detailed Application Field Plans

The L7985 is commonly used in various applications, including but not limited to:

  1. Power supplies for industrial equipment
  2. Automotive electronics
  3. Battery-powered devices
  4. Distributed power systems
  5. Telecom infrastructure
  6. Consumer electronics

Detailed and Complete Alternative Models

Some alternative models to the L7985 include:

  1. LM317: Adjustable linear voltage regulator with similar characteristics
  2. LT1085: High current linear voltage regulator with adjustable output
  3. TPS7A47: Low dropout voltage regulator with adjustable output voltage
  4. NCP1117: Fixed output voltage linear regulator with low dropout voltage

These alternative models offer different features and specifications, allowing users to choose the most suitable option for their specific requirements.

In conclusion, the L7985 is a high-efficiency linear voltage regulator with adjustable output voltage and robust protection features. It finds applications in various fields, including industrial equipment, automotive electronics, and consumer electronics. While it has some limitations compared to switching regulators, its reliability and flexibility make it a popular choice in many designs.

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Seznam 10 běžných otázek a odpovědí souvisejících s aplikací L7985 v technických řešeních

Sure! Here are 10 common questions and answers related to the application of L7985 in technical solutions:

  1. Q: What is L7985? A: L7985 is a voltage regulator IC (integrated circuit) commonly used in electronic circuits to regulate and stabilize voltage levels.

  2. Q: What is the input voltage range of L7985? A: The input voltage range of L7985 is typically between 4.5V and 38V.

  3. Q: What is the output voltage range of L7985? A: The output voltage range of L7985 can be adjusted from 0.8V to 20V.

  4. Q: What is the maximum output current of L7985? A: The maximum output current of L7985 is 5A, which makes it suitable for powering various electronic components.

  5. Q: Is L7985 a linear or switching regulator? A: L7985 is a switching regulator, specifically a step-down (buck) converter, which provides high efficiency and low power dissipation.

  6. Q: Can L7985 operate in a wide temperature range? A: Yes, L7985 is designed to operate in a wide temperature range, typically from -40°C to +125°C, making it suitable for various environments.

  7. Q: Does L7985 require external components for operation? A: Yes, L7985 requires a few external components such as input/output capacitors, an inductor, and resistors for setting the output voltage.

  8. Q: Can L7985 provide short-circuit protection? A: Yes, L7985 incorporates short-circuit protection, which helps prevent damage to the IC and connected devices in case of a short circuit.

  9. Q: Can L7985 be used in battery-powered applications? A: Yes, L7985 can be used in battery-powered applications as it has a low quiescent current and supports low-power mode to conserve energy.

  10. Q: What are some typical applications of L7985? A: L7985 is commonly used in various technical solutions such as industrial automation, consumer electronics, automotive systems, and power supplies for microcontrollers and sensors.

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