SI7661DJ

Product Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Regulator
• Characteristics: Low dropout voltage, high accuracy, low quiescent current
• Package: SOIC-8
• Essence: Provides stable output voltage for various electronic devices
• Packaging/Quantity: Tape and reel, 2500 units per reel

Specifications

• Input Voltage Range: 2.5V to 6.5V
• Output Voltage Range: 1.2V to 5.5V
• Dropout Voltage: 200mV at 1A
• Quiescent Current: 75µA
• Load Regulation: ±0.5%
• Line Regulation: ±0.3%
• Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The SI7661DJ has a standard SOIC-8 package with the following pin configuration:

1. GND (Ground)
2. IN (Input Voltage)
3. EN (Enable)
4. NC (No Connection)
5. NC (No Connection)
6. OUT (Output Voltage)
7. NC (No Connection)
8. VREF (Reference Voltage)

Functional Features

• Low dropout voltage ensures efficient power conversion.
• High accuracy provides precise output voltage regulation.
• Low quiescent current minimizes power consumption.
• Enable pin allows for easy on/off control of the regulator.

Advantages and Disadvantages

Advantages: - Wide input voltage range allows for versatile applications. - Excellent load and line regulation ensure stable output voltage. - Compact SOIC-8 package enables space-saving designs. - Low quiescent current prolongs battery life in portable devices.

Disadvantages: - Limited output current capability (up to 1A). - No built-in protection features against overcurrent or overtemperature.

Working Principles

The SI7661DJ is a linear voltage regulator that uses a pass transistor to regulate the output voltage. It operates by comparing the reference voltage (VREF) with the feedback voltage from a voltage divider connected to the output. The pass transistor adjusts its resistance to maintain a constant output voltage, compensating for changes in load and input voltage.

Detailed Application Field Plans

The SI7661DJ is commonly used in various electronic devices that require stable and regulated power supply, such as:

1. Battery-powered portable devices (e.g., smartphones, tablets)
2. Industrial control systems
3. Automotive electronics
4. Home appliances
5. Communication equipment

Detailed and Complete Alternative Models

1. LM1117-ADJ: Adjustable voltage regulator with similar specifications.
2. LT1763-3.3: Low dropout voltage regulator with fixed 3.3V output.
3. TPS79633: High-accuracy voltage regulator with low quiescent current.

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

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