LD3985J18R

Product Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Regulator
• Characteristics: Low Dropout, High Accuracy, Low Quiescent Current
• Package: TO-252-3 (DPAK)
• Essence: LD3985J18R is a voltage regulator IC designed to provide a stable output voltage with low dropout voltage. It is commonly used in various electronic devices to regulate and maintain a constant voltage level.
• Packaging/Quantity: The LD3985J18R is typically packaged in reels containing 2500 units.

Specifications

• Input Voltage Range: 2.5V - 6V
• Output Voltage: 1.8V
• Output Current: Up to 150mA
• Dropout Voltage: 200mV (typical)
• Quiescent Current: 50µA (typical)
• Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The LD3985J18R has three pins:

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

Functional Features

• Low Dropout Voltage: The LD3985J18R exhibits a low dropout voltage, allowing it to regulate the output voltage even when the input voltage is close to the desired output voltage.
• High Accuracy: This voltage regulator provides high accuracy in maintaining the output voltage within specified limits, ensuring stable performance of the connected circuitry.
• Low Quiescent Current: With a low quiescent current, the LD3985J18R minimizes power consumption when the load is light or idle, making it suitable for battery-powered applications.

Advantages and Disadvantages

Advantages: - Low dropout voltage ensures efficient regulation - High accuracy for stable output voltage - Low quiescent current reduces power consumption

Disadvantages: - Limited output current capacity (up to 150mA) - Restricted input voltage range (2.5V - 6V)

Working Principles

The LD3985J18R 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. The internal circuitry compares the output voltage with a reference voltage and adjusts the pass transistor accordingly to maintain a constant output voltage.

Detailed Application Field Plans

The LD3985J18R finds applications in various electronic devices, including but not limited to: - Mobile phones - Portable media players - Digital cameras - Wireless communication devices - Battery-powered systems

Detailed and Complete Alternative Models

1. LM1117-1.8: Similar low dropout voltage regulator with an output voltage of 1.8V.
2. LT1763-1.8: Low dropout voltage regulator with high accuracy and an output voltage of 1.8V.
3. MCP1700-1802E: Low dropout voltage regulator with low quiescent current and an output voltage of 1.8V.

These alternative models offer similar functionality and can be considered as substitutes for the LD3985J18R in various applications.

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