S-817B40AY-Z2-U

Product Overview

Category

S-817B40AY-Z2-U belongs to the category of voltage regulators.

Use

This product is commonly used for voltage regulation in various electronic devices and circuits.

Characteristics

• Input Voltage Range: 2.0V to 6.0V
• Output Voltage: 4.0V
• Output Current: 50mA (max)
• Low Quiescent Current: 1.0µA (typ)
• Low Dropout Voltage: 160mV (typ)
• High Ripple Rejection: 70dB (typ)
• Built-in Overcurrent Protection
• Small Package Size: SOT-23-5

Package and Quantity

The S-817B40AY-Z2-U is available in a small SOT-23-5 package. It is typically sold in reels containing 3000 units.

Specifications

• Input Voltage Range: 2.0V to 6.0V
• Output Voltage: 4.0V ±2%
• Output Current: 50mA (max)
• Dropout Voltage: 160mV (typ)
• Quiescent Current: 1.0µA (typ)
• Ripple Rejection: 70dB (typ)
• Operating Temperature Range: -40°C to +85°C
• Package Type: SOT-23-5

Pin Configuration

The S-817B40AY-Z2-U has the following pin configuration:

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Pin 1: VIN (Input Voltage) Pin 2: GND (Ground) Pin 3: NC (No Connection) Pin 4: VOUT (Output Voltage) Pin 5: CE (Control Enable)

Functional Features

• Voltage regulation: The S-817B40AY-Z2-U provides a stable output voltage of 4.0V, regardless of input voltage fluctuations.
• Low quiescent current: With a typical quiescent current of only 1.0µA, this regulator minimizes power consumption when the load is light.
• Overcurrent protection: The built-in overcurrent protection feature safeguards the circuit from excessive current flow, preventing damage to the device.
• High ripple rejection: The regulator exhibits excellent ripple rejection characteristics, ensuring a clean and stable output voltage even in the presence of noise.

Advantages and Disadvantages

Advantages

• Wide input voltage range allows compatibility with various power sources.
• Low dropout voltage ensures efficient power conversion.
• Small package size enables space-saving designs.
• Built-in overcurrent protection enhances circuit reliability.
• High ripple rejection provides a stable output voltage.

Disadvantages

• Limited output current capacity (50mA max) may not be suitable for high-power applications.
• No adjustable output voltage option available.

Working Principles

The S-817B40AY-Z2-U is a fixed-output voltage regulator based on a CMOS process. It utilizes a feedback mechanism to maintain a constant output voltage of 4.0V. When the input voltage exceeds the desired output voltage, the internal control circuitry reduces the pass transistor's resistance, resulting in a lower output voltage. Conversely, if the input voltage drops below the desired output voltage, the control circuitry increases the pass transistor's resistance to raise the output voltage.

Detailed Application Field Plans

The S-817B40AY-Z2-U finds application in various electronic devices and circuits that require a stable 4.0V power supply. Some potential application fields include:

1. Battery-powered devices: Portable electronics such as smartphones, tablets, and wearable devices can benefit from the S-817B40AY-Z2-U's efficient voltage regulation and low quiescent current.
2. IoT devices: Internet of Things (IoT) devices often operate on low power and require a stable voltage source. The S-817B40AY-Z2-U can be used in sensors, smart home devices, and other IoT applications.
3. Industrial control systems: The regulator's small package size and overcurrent protection make it suitable for use in industrial control systems, where space constraints and reliability are crucial.

Detailed and Complete Alternative Models

1. S-817A Series: This series offers various fixed-output voltage options with similar characteristics to the S-817B40AY-Z2-U. It is available in different package types, including SOT-23-5 and SOT-89-5.
2. S-817C Series: These regulators provide adjustable output voltage options within a specific range. They offer flexibility in voltage selection but may have slightly different characteristics compared to the S-817B40AY-Z2-U.

Note: Please refer to the manufacturer's datasheet for detailed specifications and alternative models.

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