LD2979Z33

Product Overview

Category: Integrated Circuit (IC)

Use: LD2979Z33 is a voltage regulator IC that provides a stable output voltage for various electronic devices.

Characteristics: - Input Voltage Range: 4.5V to 18V - Output Voltage: 3.3V - Maximum Output Current: 500mA - Low Dropout Voltage: 200mV at 100mA - Low Quiescent Current: 50µA - Thermal Shutdown Protection - Short-Circuit Protection

Package: LD2979Z33 is available in a small surface-mount SOT-23 package.

Essence: LD2979Z33 is designed to regulate the input voltage and provide a constant output voltage of 3.3V, ensuring stable operation of electronic devices.

Packaging/Quantity: The LD2979Z33 is typically sold in reels containing 3000 units per reel.

Specifications

• Input Voltage Range: 4.5V to 18V
• Output Voltage: 3.3V ±2%
• Output Current: Up to 500mA
• Dropout Voltage: 200mV at 100mA
• Quiescent Current: 50µA
• Operating Temperature Range: -40°C to +85°C
• Package Type: SOT-23

Detailed Pin Configuration

The LD2979Z33 has three pins:

1. VIN (Pin 1): Input voltage pin. Connects to the power supply.
2. GND (Pin 2): Ground pin. Connected to the common ground.
3. VOUT (Pin 3): Output voltage pin. Provides a regulated 3.3V output.

Functional Features

• Voltage Regulation: LD2979Z33 maintains a stable output voltage of 3.3V, even with varying input voltages.
• Low Dropout Voltage: The IC has a low dropout voltage of 200mV at 100mA, ensuring efficient power conversion.
• Thermal Shutdown Protection: It incorporates thermal shutdown protection to prevent overheating and damage.
• Short-Circuit Protection: The LD2979Z33 is equipped with short-circuit protection, safeguarding the device from excessive current.

Advantages and Disadvantages

Advantages: - Wide input voltage range allows compatibility with various power sources. - Low quiescent current minimizes power consumption in standby mode. - Small package size enables space-saving designs. - Thermal shutdown and short-circuit protection enhance reliability.

Disadvantages: - Limited maximum output current may not be suitable for high-power applications. - Output voltage fixed at 3.3V, limiting flexibility in certain scenarios.

Working Principles

The LD2979Z33 utilizes a voltage reference, error amplifier, and pass transistor to regulate the output voltage. When the input voltage exceeds the desired output voltage, the error amplifier adjusts the pass transistor to reduce the output voltage. Conversely, if the input voltage drops below the desired output voltage, the error amplifier increases the pass transistor's conduction to maintain the output voltage at 3.3V.

Detailed Application Field Plans

The LD2979Z33 is commonly used in various electronic devices that require a stable 3.3V power supply. Some typical application fields include:

1. Embedded Systems: Used in microcontroller-based systems, IoT devices, and industrial automation equipment.
2. Consumer Electronics: Powering portable devices such as smartphones, tablets, and digital cameras.
3. Wireless Communication: Providing regulated voltage for wireless modules, Bluetooth devices, and Wi-Fi routers.
4. Automotive Electronics: Used in automotive applications like infotainment systems, GPS devices, and engine control units.

Detailed and Complete Alternative Models

1. LD2979Z25: Provides a regulated output voltage of 2.5V with similar specifications.
2. LD2979Z50: Offers a regulated output voltage of 5.0V for applications requiring higher voltage levels.
3. LD2979Z12: Designed to provide a regulated output voltage of 12V for specific applications.

These alternative models offer different output voltage options while maintaining similar characteristics and package types.

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