REG1117-3.3

The REG1117-3.3 is a low-dropout (LDO) voltage regulator manufactured by Texas Instruments. It is designed to provide a stable output voltage of 3.3 volts with a maximum output current of 1 ampere. This device is particularly useful in applications where space is limited and efficiency is crucial, such as in portable electronics, microcontroller power supplies, and battery-operated devices.

Key Features:

1. Input Voltage Range: The REG1117-3.3 can accept a wide input voltage range, typically from 4.75V to 15V, making it versatile for various power supply configurations.

2. Low Dropout Voltage: With a dropout voltage of around 1.2V at full load, it allows for efficient operation even when the input voltage is close to the output voltage, which is essential for battery-powered applications.

3. Thermal Protection: The regulator includes built-in thermal shutdown protection, which prevents damage from overheating by shutting down the output if the junction temperature exceeds safe limits.

4. Current Limiting: It features current limiting to protect against overcurrent conditions, ensuring the device operates safely under various load conditions.

5. Compact Package: The REG1117-3.3 is available in a small surface-mount package, such as the TO-220 or SOT-223, which is ideal for space-constrained designs.

6. Low Quiescent Current: The device has a low quiescent current, which helps to extend battery life in portable applications.

7. Output Capacitor: It is stable with a wide range of output capacitors, including ceramic capacitors, which can help reduce the size of the overall circuit.

Applications:

• Microcontroller Power Supplies: Ideal for powering microcontrollers and digital signal processors that require a stable 3.3V supply.
• Portable Devices: Commonly used in battery-operated devices where efficiency and low dropout are critical.
• Communication Equipment: Suitable for use in communication devices that require reliable voltage regulation.
• Consumer Electronics: Found in various consumer electronics where a stable power supply is necessary.

Performance Characteristics:

• Output Voltage Accuracy: The output voltage is typically accurate to within ±2%, ensuring reliable performance in sensitive applications.
• Transient Response: The REG1117-3.3 exhibits good transient response characteristics, maintaining output stability during load changes.

In summary, the REG1117-3.3 from Texas Instruments is a highly efficient, reliable, and compact voltage regulator that is well-suited for a variety of electronic applications requiring a stable 3.3V output. Its combination of low dropout voltage, thermal protection, and current limiting makes it a popular choice among engineers and designers.