LD3985G18R

Product Overview

Category

LD3985G18R belongs to the category of voltage regulators.

Use

It is primarily used for regulating voltage in electronic circuits.

Characteristics

• Package: LD3985G18R comes in a small surface-mount package.
• Essence: The essence of LD3985G18R lies in its ability to provide stable and regulated voltage output.
• Packaging/Quantity: It is typically available in reels or tubes, with varying quantities depending on the supplier.

Specifications

The LD3985G18R has the following specifications:

• Input Voltage Range: 2.5V to 6.5V
• Output Voltage: 1.8V
• Maximum Output Current: 150mA
• Dropout Voltage: 300mV at 150mA
• Quiescent Current: 45µA (typical)
• Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The LD3985G18R has three pins:

1. VIN: Input voltage pin
2. GND: Ground pin
3. VOUT: Output voltage pin

Functional Features

• Low dropout voltage: The LD3985G18R exhibits a low dropout voltage, ensuring efficient regulation even when the input voltage is close to the desired output voltage.
• Low quiescent current: With a low quiescent current, the LD3985G18R minimizes power consumption when the load is light.
• Thermal shutdown protection: The device incorporates thermal shutdown protection, preventing damage due to excessive temperature.
• Short-circuit protection: LD3985G18R includes short-circuit protection, safeguarding the circuit from potential damage.

Advantages and Disadvantages

Advantages

• Small package size allows for space-saving designs.
• Low dropout voltage ensures efficient voltage regulation.
• Low quiescent current minimizes power consumption.
• Thermal shutdown and short-circuit protection enhance reliability.

Disadvantages

• Limited maximum output current of 150mA may not be suitable for high-power applications.
• Input voltage range is restricted to 2.5V to 6.5V.

Working Principles

The LD3985G18R operates based on the principle of a linear voltage regulator. It uses a pass transistor to regulate the output voltage by adjusting the resistance between the input and output terminals. By comparing the output voltage with a reference voltage, the device adjusts the resistance to maintain a stable output voltage.

Detailed Application Field Plans

The LD3985G18R finds applications in various electronic devices, including but not limited to: - Battery-powered devices - Portable audio players - Mobile phones - Wearable devices - IoT modules

Detailed and Complete Alternative Models

Some alternative models that can be considered as alternatives to LD3985G18R are: - LM1117-1.8: A popular linear voltage regulator with similar specifications. - MCP1700-1802E: Another low dropout voltage regulator suitable for various applications. - TPS78218: A high-performance, low-dropout voltage regulator with adjustable output voltage.

These alternative models offer similar functionality and can be used as substitutes depending on specific requirements.

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