LM7805S/NOPB

Overview

Category: Integrated Circuit (IC)

Use: Voltage Regulator

Characteristics: - Fixed output voltage of 5V - Maximum output current of 1A - Low dropout voltage - Thermal shutdown protection - Short circuit current limiting

Package: TO-263 (D2PAK)

Essence: The LM7805S/NOPB is a linear voltage regulator that provides a stable 5V output voltage from a higher input voltage source.

Packaging/Quantity: The LM7805S/NOPB is available in a TO-263 package and is typically sold in reels or tubes containing multiple units.

Specifications

• Input Voltage Range: 7V to 25V
• Output Voltage: 5V ±4%
• Output Current: Up to 1A
• Dropout Voltage: 2V (typical)
• Quiescent Current: 6mA (typical)
• Operating Temperature Range: -40°C to +125°C

Pin Configuration

The LM7805S/NOPB has three pins:

1. Input (VIN): This pin is connected to the input voltage source.
2. Ground (GND): This pin is connected to the ground reference.
3. Output (VOUT): This pin provides the regulated 5V output voltage.

Functional Features

• Voltage Regulation: The LM7805S/NOPB maintains a constant output voltage of 5V, regardless of variations in the input voltage or load conditions.
• Thermal Shutdown Protection: If the temperature exceeds a safe limit, the device shuts down to prevent damage.
• Short Circuit Current Limiting: In case of a short circuit, the LM7805S/NOPB limits the output current to protect itself and the connected circuitry.

Advantages and Disadvantages

Advantages: - Simple to use and integrate into circuits. - Provides a stable and regulated 5V output. - Offers protection against thermal overload and short circuits. - Widely available and cost-effective.

Disadvantages: - Generates heat during operation, requiring proper heat sinking. - Limited maximum output current of 1A.

Working Principles

The LM7805S/NOPB is a linear voltage regulator that uses a series pass transistor to regulate the output voltage. It compares the output voltage with a reference voltage and adjusts the pass transistor accordingly to maintain a constant 5V output. The excess voltage is dissipated as heat.

Detailed Application Field Plans

The LM7805S/NOPB is commonly used in various electronic applications, including:

1. Power Supplies: It is widely used to provide a regulated 5V supply for microcontrollers, sensors, and other digital components.
2. Battery Chargers: The LM7805S/NOPB can be used to regulate the charging voltage for batteries.
3. Audio Amplifiers: It can be employed to provide a stable power source for audio amplifiers and preamplifiers.
4. LED Lighting: The LM7805S/NOPB can be utilized to power and regulate the voltage for LED lighting systems.

Detailed and Complete Alternative Models

Some alternative models to the LM7805S/NOPB include:

1. LM317: Adjustable voltage regulator with a wide input voltage range.
2. LM1117: Fixed voltage regulator with low dropout voltage.
3. AMS1117: Low dropout voltage regulator with various fixed output voltages.
4. NCP1117: High-performance voltage regulator with low dropout voltage.

These alternatives offer similar functionality but may have different specifications and package options.

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