L4931CDT33

Product Overview

• Category: Voltage Regulator
• Use: To regulate and stabilize voltage in electronic circuits
• Characteristics: Low dropout, low quiescent current, high accuracy
• Package: TO-252 (DPAK)
• Essence: Linear voltage regulator
• Packaging/Quantity: Tape and reel, 2500 units per reel

Specifications

• Input Voltage Range: 4.4V to 26V
• Output Voltage: 3.3V
• Output Current: Up to 100mA
• Dropout Voltage: 0.6V (typical)
• Quiescent Current: 5mA (maximum)
• Line Regulation: 0.04% (typical)
• Load Regulation: 0.2% (typical)
• Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The L4931CDT33 has three pins:

1. Input (VIN): Connects to the input voltage source.
2. Ground (GND): Connected to the ground reference of the circuit.
3. Output (VOUT): Provides the regulated output voltage.

Functional Features

• Low Dropout: The L4931CDT33 has a low dropout voltage, ensuring stable regulation even when the input voltage is close to the desired output voltage.
• Low Quiescent Current: The device consumes minimal current when in standby mode, reducing power consumption.
• High Accuracy: The voltage regulator provides precise and stable output voltage, ensuring reliable operation of connected components.

Advantages and Disadvantages

Advantages: - Low dropout voltage allows for efficient regulation. - Low quiescent current minimizes power consumption. - High accuracy ensures reliable performance.

Disadvantages: - Limited output current capability (up to 100mA). - Not suitable for applications requiring higher output voltages.

Working Principles

The L4931CDT33 is a linear voltage regulator that uses a pass transistor to regulate the output voltage. It compares the reference voltage with the feedback voltage and adjusts the pass transistor accordingly to maintain a stable output voltage. The dropout voltage is minimized by using a PNP pass transistor.

Detailed Application Field Plans

The L4931CDT33 is commonly used in various electronic devices and circuits, including:

1. Battery-Powered Devices: Portable electronics such as smartphones, tablets, and portable media players benefit from the low dropout voltage and low quiescent current of the L4931CDT33.
2. Embedded Systems: Microcontrollers, sensors, and other components in embedded systems require stable and accurate power supply, making the L4931CDT33 an ideal choice.
3. Automotive Electronics: The L4931CDT33's wide operating temperature range makes it suitable for automotive applications where temperature fluctuations are common.

Detailed and Complete Alternative Models

1. LM1117-3.3: Similar to the L4931CDT33, this voltage regulator offers a dropout voltage of 1.2V and can provide up to 800mA of output current.
2. LT1763-3.3: This regulator provides a low dropout voltage of 0.18V and can deliver up to 500mA of output current.
3. TS2950CT-3.3: With a dropout voltage of 0.5V and an output current of 150mA, this voltage regulator is a suitable alternative to the L4931CDT33.

In conclusion, the L4931CDT33 is a voltage regulator known for its low dropout voltage, low quiescent current, and high accuracy. It is commonly used in battery-powered devices, embedded systems, and automotive electronics. While it has limitations in terms of output current and voltage range, there are alternative models available with different specifications to suit specific application requirements.