MIC3172BN

Product Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Regulator
• Characteristics: High-performance, adjustable output voltage, low dropout voltage, current limiting, thermal shutdown
• Package: DIP (Dual In-line Package)
• Essence: The MIC3172BN is a voltage regulator IC designed to provide a stable and adjustable output voltage for various electronic applications.
• Packaging/Quantity: Available in tubes or reels, with 25 units per tube/reel.

Specifications

• Input Voltage Range: 4.5V to 40V
• Output Voltage Range: 1.25V to 37V
• Output Current: Up to 1.5A
• Dropout Voltage: 0.6V typical at 1A load
• Line Regulation: 0.01% typical
• Load Regulation: 0.1% typical
• Operating Temperature Range: -40°C to +125°C

Pin Configuration

The MIC3172BN has a standard dual in-line package (DIP) with 8 pins. The pin configuration is as follows:

```

---

| | --| Vout Vin|-- --| GND Adj|-- --| NC NC |-- |___________| ```

• Vin: Input voltage pin
• Vout: Output voltage pin
• GND: Ground pin
• Adj: Adjust pin (used to set the desired output voltage)
• NC: No connection pins

Functional Features

• Adjustable Output Voltage: The MIC3172BN allows the user to adjust the output voltage within a wide range, making it versatile for different applications.
• Low Dropout Voltage: The regulator maintains a low dropout voltage, ensuring efficient power conversion even when the input voltage is close to the desired output voltage.
• Current Limiting: The IC incorporates a current limiting feature that protects the circuit from excessive current flow, preventing damage to the regulator and connected components.
• Thermal Shutdown: In case of excessive heat, the MIC3172BN has a built-in thermal shutdown mechanism that automatically turns off the device to prevent overheating.

Advantages

• Wide input voltage range allows for compatibility with various power sources.
• Adjustable output voltage provides flexibility for different application requirements.
• Low dropout voltage ensures efficient power conversion.
• Current limiting feature protects the circuit from overcurrent situations.
• Thermal shutdown mechanism prevents overheating and potential damage.

Disadvantages

• Limited output current capacity (up to 1.5A).
• DIP package may not be suitable for space-constrained applications.
• Requires external components for proper operation (input/output capacitors, resistors).

Working Principles

The MIC3172BN is a linear voltage regulator that uses a feedback mechanism to maintain a stable output voltage. It compares the actual output voltage with a reference voltage and adjusts the internal circuitry to achieve the desired output voltage. The regulator operates in a continuous mode, continuously adjusting its internal components to compensate for changes in load and input voltage.

Application Field Plans

The MIC3172BN can be used in various electronic applications that require a stable and adjustable output voltage. Some potential application fields include:

1. Power supply circuits for microcontrollers and digital logic circuits.
2. Battery charging circuits.
3. Audio amplifiers and preamplifiers.
4. LED lighting systems.
5. Automotive electronics.
6. Industrial control systems.

Alternative Models

• LM317: A popular alternative with similar specifications and functionality.
• LT1084: Offers higher output current capability (up to 5A) but at a higher cost.
• LM1117: Low-cost alternative with fixed output voltage options.

These alternative models provide similar voltage regulation capabilities and can be considered based on specific application requirements and cost considerations.

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