BU18UB3WG-TR

Product Overview

Category: Integrated Circuit (IC)

Use: Voltage Regulator

Characteristics: - Low dropout voltage - High output current capability - Thermal shutdown protection - Overcurrent protection - Short-circuit protection

Package: SOT-223

Essence: The BU18UB3WG-TR is a voltage regulator IC that provides a stable output voltage for various electronic devices.

Packaging/Quantity: The BU18UB3WG-TR is typically packaged in reels and comes in quantities of 3000 units per reel.

Specifications

• Input Voltage Range: 2.5V to 18V
• Output Voltage Range: 1.2V to 16V
• Output Current: Up to 1.5A
• Dropout Voltage: 0.4V at 1A
• Quiescent Current: 75µA
• Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The BU18UB3WG-TR has the following pin configuration:

1. VIN (Input Voltage)
2. GND (Ground)
3. VOUT (Output Voltage)

Functional Features

• Low Dropout Voltage: The BU18UB3WG-TR exhibits a low dropout voltage, ensuring efficient regulation even when the input voltage is close to the desired output voltage.
• High Output Current Capability: With a maximum output current of 1.5A, this voltage regulator can power a wide range of electronic devices.
• Thermal Shutdown Protection: The IC incorporates thermal shutdown protection, which prevents damage due to excessive heat by shutting down the regulator temporarily.
• Overcurrent Protection: The BU18UB3WG-TR includes overcurrent protection, safeguarding the circuit from excessive current flow.
• Short-Circuit Protection: In the event of a short circuit, the IC automatically shuts down to prevent damage to the device and surrounding components.

Advantages and Disadvantages

Advantages: - Stable output voltage - Wide input voltage range - High output current capability - Built-in protection features

Disadvantages: - Dropout voltage may be relatively higher compared to some other voltage regulators in the market. - Limited output voltage range (1.2V to 16V)

Working Principles

The BU18UB3WG-TR operates based on the principle of linear voltage regulation. It uses a pass transistor to regulate the output voltage by adjusting the resistance between the input and output terminals. The internal circuitry monitors the input and output voltages, ensuring that the output remains stable even with varying load conditions.

Detailed Application Field Plans

The BU18UB3WG-TR is commonly used in various electronic devices that require a stable and regulated power supply. Some typical application fields include:

1. Mobile Devices: Smartphones, tablets, portable media players.
2. Computer Peripherals: USB hubs, external hard drives, printers.
3. Consumer Electronics: Set-top boxes, gaming consoles, audio amplifiers.
4. Industrial Equipment: Power supplies, motor control circuits, LED lighting.

Detailed and Complete Alternative Models

1. LM1117-ADJ: Adjustable Voltage Regulator, SOT-223 package, 800mA output current.
2. LT1086-5: Fixed 5V Voltage Regulator, SOT-223 package, 1.5A output current.
3. TPS79133DBVR: Fixed 3.3V Voltage Regulator, SOT-23 package, 100mA output current.

These alternative models offer similar functionality and can be considered as substitutes for the BU18UB3WG-TR depending on specific requirements.

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