NCT3705U-28 TR

Overview

Category: Integrated Circuit (IC)

Use: Power Management IC

Characteristics: - Low Dropout Voltage Regulator - 2.8V Fixed Output Voltage - Ultra-Low Quiescent Current - Thermal Shutdown Protection - Short Circuit Protection

Package: SOT-23-5

Essence: The NCT3705U-28 TR is a power management IC designed to regulate voltage with low dropout and ultra-low quiescent current.

Packaging/Quantity: The NCT3705U-28 TR is available in a SOT-23-5 package. It is typically sold in reels of 3000 units.

Specifications

• Input Voltage Range: 2.7V to 6.5V
• Output Voltage: 2.8V
• Dropout Voltage: 200mV at 100mA
• Quiescent Current: 1µA (typical)
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The NCT3705U-28 TR has the following pin configuration:

```

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| | --| V IN|-- Pin 1 --| GND |-- Pin 2 --| EN |-- Pin 3 --| FB |-- Pin 4 --| V OUT|-- Pin 5 |____| ```

Functional Features

• Low Dropout Voltage: The NCT3705U-28 TR provides a low dropout voltage, ensuring efficient regulation even when the input voltage is close to the output voltage.
• Ultra-Low Quiescent Current: With a typical quiescent current of only 1µA, this IC minimizes power consumption during standby or idle modes.
• Thermal Shutdown Protection: The IC includes built-in thermal shutdown protection, preventing damage due to excessive temperature.
• Short Circuit Protection: The NCT3705U-28 TR features short circuit protection, safeguarding the device and connected components from damage in case of a short circuit.

Advantages and Disadvantages

Advantages: - Low dropout voltage ensures efficient regulation. - Ultra-low quiescent current minimizes power consumption. - Thermal shutdown protection prevents overheating. - Short circuit protection safeguards the device and connected components.

Disadvantages: - Limited output voltage options (fixed at 2.8V). - SOT-23-5 package may require surface mount soldering expertise.

Working Principles

The NCT3705U-28 TR is a linear voltage regulator that uses a pass transistor to regulate the output voltage. It compares the feedback voltage (FB) with a reference voltage to adjust the pass transistor's resistance and maintain a stable output voltage. The enable pin (EN) controls the regulator's operation, allowing it to be turned on or off as needed.

Detailed Application Field Plans

The NCT3705U-28 TR is commonly used in various applications where a stable 2.8V power supply is required. Some typical application fields include:

1. Battery-Powered Devices:

   • Portable electronics
   • Wearable devices
   • IoT sensors

2. Automotive Electronics:

   • Infotainment systems
   • Dashboard displays
   • Lighting control modules

3. Industrial Control Systems:

   • PLCs (Programmable Logic Controllers)
   • Motor control units
   • Sensor interfaces

4. Communication Equipment:

   • Wireless routers
   • Network switches
   • Base stations

Detailed and Complete Alternative Models

Some alternative models that offer similar functionality to the NCT3705U-28 TR are:

1. LM1117-2.8: Low dropout voltage regulator with a fixed 2.8V output.
2. MCP1700-2802E/TO: Ultra-low quiescent current LDO regulator with a fixed 2.8V output.
3. TPS78228DRVT: High-performance LDO voltage regulator with a fixed 2.8V output and thermal shutdown protection.

These alternative models can be considered based on specific application requirements and availability.

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