LD1085D2T12R

Product Overview

• Category: Integrated Circuit
• Use: Voltage Regulator
• Characteristics: Low Dropout, 1.2V Fixed Output
• Package: TO-220, 3-Pin
• Essence: LD1085D2T12R is a voltage regulator integrated circuit designed to provide a stable and regulated output voltage of 1.2V with low dropout characteristics.
• Packaging/Quantity: Available in reels or tubes, quantity varies based on manufacturer.

Specifications

• Input Voltage Range: 4.5V - 20V
• Output Voltage: 1.2V
• Output Current: Up to 3A
• Dropout Voltage: 1.5V (typical)
• Operating Temperature Range: -40°C to +125°C
• Line Regulation: ±0.2% (typical)
• Load Regulation: ±0.4% (typical)
• Ripple Rejection Ratio: 70dB (typical)

Pin Configuration

The LD1085D2T12R has the following pin configuration:

```

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| | --| VIN GND |-- --| VOUT ADJ |-- |___________| ```

• VIN: Input Voltage
• GND: Ground
• VOUT: Output Voltage
• ADJ: Adjustable Pin (connected to ground for fixed 1.2V output)

Functional Features

• Low dropout voltage allows efficient regulation even when the input voltage is close to the desired output voltage.
• Built-in thermal shutdown protection prevents damage due to excessive temperature.
• Overcurrent protection safeguards the circuit from excessive current flow.
• Short-circuit protection ensures the device remains safe during fault conditions.
• Adjustable output voltage using the ADJ pin (requires external resistors).

Advantages and Disadvantages

Advantages: - Low dropout voltage ensures efficient regulation. - Wide input voltage range allows flexibility in various applications. - High ripple rejection ratio provides stable output even in noisy environments. - Built-in protection features enhance reliability.

Disadvantages: - Fixed output voltage limits versatility compared to adjustable regulators. - Higher dropout voltage compared to some newer regulator models. - Limited output current capacity of up to 3A.

Working Principles

The LD1085D2T12R is a linear voltage regulator that uses a pass transistor to regulate the output voltage. It operates by comparing the reference voltage with the feedback voltage obtained from the output. The pass transistor adjusts its resistance to maintain a constant output voltage, compensating for changes in load and input voltage.

Detailed Application Field Plans

The LD1085D2T12R finds applications in various fields, including:

1. Power Supplies: It can be used as a voltage regulator in power supply circuits for electronic devices, ensuring a stable and regulated output voltage.
2. Automotive Electronics: The LD1085D2T12R can be employed in automotive electronics, such as infotainment systems or engine control units, to provide reliable voltage regulation.
3. Industrial Control Systems: It is suitable for use in industrial control systems where precise and stable voltage regulation is required.
4. Telecommunications: The LD1085D2T12R can be utilized in telecommunications equipment to ensure consistent voltage levels for reliable operation.

Detailed and Complete Alternative Models

Some alternative models to LD1085D2T12R include:

1. LM317: A popular adjustable voltage regulator with a wide input voltage range and high output current capability.
2. LT1084: A fixed output voltage regulator with low dropout characteristics and higher output current capacity.
3. LM1117: A low dropout voltage regulator available in various fixed output voltages, suitable for a wide range of applications.

These alternative models offer different features and specifications, providing options based on specific requirements.

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