LDS3985M18R

Product Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Regulator
• Characteristics: High-performance, low dropout voltage regulator
• Package: TO-252-3 (DPAK)
• Essence: Provides a stable output voltage with low dropout voltage and high accuracy
• Packaging/Quantity: Available in tape and reel packaging, quantity varies based on supplier

Specifications

• Input Voltage Range: 2.5V to 20V
• Output Voltage: 1.8V
• Output Current: Up to 1A
• Dropout Voltage: 300mV (typical)
• Line Regulation: ±0.05% (typical)
• Load Regulation: ±0.1% (typical)
• Quiescent Current: 75µA (typical)
• Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The LDS3985M18R has three pins:

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

Functional Features

• Low dropout voltage: Allows the regulator to operate even when the input voltage is close to the desired output voltage.
• High accuracy: Provides a stable output voltage with minimal variation.
• Low quiescent current: Ensures efficient power consumption when the load is light.
• Overcurrent and thermal protection: Safeguards the regulator and connected components from damage.

Advantages and Disadvantages

Advantages

• High-performance voltage regulation
• Wide input voltage range
• Low dropout voltage
• Excellent line and load regulation
• Thermal and overcurrent protection

Disadvantages

• Limited output current capacity (up to 1A)
• Requires external capacitors for stability

Working Principles

The LDS3985M18R 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.

Detailed Application Field Plans

The LDS3985M18R is commonly used in various applications, including:

1. Battery-powered devices: Provides a stable voltage supply for portable electronics.
2. Automotive systems: Regulates voltage for automotive electronics, such as infotainment systems and lighting modules.
3. Industrial equipment: Ensures reliable power for control systems and sensors.
4. Communication devices: Used in routers, modems, and other network equipment.
5. Consumer electronics: Power management for televisions, audio systems, and gaming consoles.

Detailed and Complete Alternative Models

1. LM1117-1.8: Similar low dropout voltage regulator with adjustable output voltage.
2. LT1763-1.8: High-performance, low dropout regulator with ultra-low quiescent current.
3. TPS7A1801-SP: Radiation-hardened voltage regulator for space applications.

These alternative models offer similar functionality and can be considered based on specific requirements.

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