S-1721D1818-M6T1U

Basic Information Overview

• Category: Integrated Circuit (IC)
• Use: Power Management
• Characteristics: Low Dropout Voltage Regulator
• Package: SOT-23-6
• Essence: Voltage Regulator IC
• Packaging/Quantity: Tape and Reel, 3000 pieces per reel

Specifications

• Input Voltage Range: 2.5V to 6.0V
• Output Voltage Range: 1.2V to 5.5V
• Maximum Output Current: 150mA
• Dropout Voltage: 200mV (typical) at 100mA load current
• Quiescent Current: 40μA (typical)
• Line Regulation: ±0.05% (typical)
• Load Regulation: ±0.3% (typical)
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The S-1721D1818-M6T1U has a total of six pins arranged in the following configuration:

```

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| | --| Vout Vin|-- --| GND EN |-- |___________| ```

Pin Description: - Vout: Output voltage pin - Vin: Input voltage pin - GND: Ground pin - EN: Enable pin

Functional Features

• Low dropout voltage: The S-1721D1818-M6T1U exhibits a low dropout voltage, ensuring stable output voltage even when the input voltage is close to the desired output voltage.
• Low quiescent current: With a typical quiescent current of only 40μA, this IC minimizes power consumption when in standby mode.
• Excellent line and load regulation: The device maintains a stable output voltage despite variations in input voltage and load conditions.
• Thermal shutdown protection: The IC incorporates a thermal shutdown feature that protects it from overheating, ensuring safe operation.

Advantages

• Compact package: The SOT-23-6 package allows for space-efficient integration into various electronic devices.
• Wide input voltage range: The IC can operate within a wide input voltage range, making it suitable for a variety of applications.
• Low dropout voltage: The low dropout voltage ensures efficient power conversion and minimizes power dissipation.

Disadvantages

• Limited output current: The maximum output current of 150mA may not be sufficient for high-power applications.
• Temperature limitations: The operating temperature range of -40°C to +85°C may restrict its use in extreme temperature environments.

Working Principles

The S-1721D1818-M6T1U is a linear voltage regulator that utilizes a PNP transistor as the pass element. It regulates the output voltage by adjusting the resistance between the input and output terminals. When the input voltage exceeds the desired output voltage, the pass element reduces the resistance, allowing the excess voltage to be dissipated as heat. Conversely, when the input voltage drops below the desired output voltage, the pass element increases the resistance to maintain a stable output voltage.

Detailed Application Field Plans

The S-1721D1818-M6T1U is commonly used in various battery-powered portable devices, such as smartphones, tablets, digital cameras, and portable media players. It provides a stable voltage supply for the internal circuitry, ensuring proper operation and extending battery life.

Detailed and Complete Alternative Models

• S-1711 Series: Low Dropout Voltage Regulators with different output current options.
• S-1721 Series: Low Dropout Voltage Regulators with adjustable output voltage options.
• S-1701 Series: Low Dropout Voltage Regulators with ultra-low quiescent current.

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

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