The STMicroelectronics BD680 is a high-performance, low-dropout (LDO) voltage regulator designed for various applications requiring stable and efficient power supply. This device is particularly suitable for powering sensitive analog and digital circuits, including microcontrollers, RF devices, and other low-power applications. The BD680 is known for its excellent line and load regulation, low noise, and high power supply rejection ratio (PSRR), making it a reliable choice for designers seeking to ensure stable voltage levels in their systems.

## Key Features

1. Low Dropout Voltage: The BD680 features a low dropout voltage, typically around 0.2V at a load current of 100mA. This characteristic allows the regulator to maintain a stable output voltage even when the input voltage is close to the output voltage, which is particularly useful in battery-powered applications.

2. Wide Input Voltage Range: The device can operate with an input voltage range of 3V to 15V, providing flexibility for various power supply configurations. This wide range makes the BD680 suitable for use in different applications, from portable devices to industrial equipment.

3. Adjustable Output Voltage: The BD680 offers an adjustable output voltage option, allowing designers to set the desired output voltage using external resistors. This feature is beneficial for applications requiring specific voltage levels.

4. High Power Supply Rejection Ratio (PSRR): The BD680 exhibits a high PSRR, typically around 70dB at low frequencies. This characteristic ensures that variations in the input voltage do not significantly affect the output voltage, providing stable performance in noisy environments.

5. Low Quiescent Current: The regulator has a low quiescent current of approximately 30µA, which is advantageous for battery-operated devices, as it helps extend battery life by minimizing power consumption when the device is in standby mode.

6. Thermal Protection: The BD680 includes built-in thermal shutdown protection, which prevents the device from overheating and ensures reliable operation under varying load conditions.

7. Compact Package: The BD680 is available in a compact SOT-23 package, making it suitable for space-constrained applications. This small form factor allows for easy integration into various circuit designs.

## Specifications

- Device Type: Low Dropout Voltage Regulator (LDO)
- Input Voltage Range: 3V to 15V
- Output Voltage Range: Adjustable (typically from 1.2V to 12V)
- Dropout Voltage: 0.2V (at 100mA load)
- Output Current: Up to 150mA
- Quiescent Current: 30µA (typical)
- Power Supply Rejection Ratio (PSRR): 70dB (at low frequencies)
- Thermal Shutdown: Yes
- Operating Temperature Range: -40°C to +125°C
- Package Type: SOT-23

## Applications

The STMicroelectronics BD680 is suitable for a wide range of applications, including:

- Battery-Powered Devices: Ideal for portable electronics where low quiescent current and low dropout voltage are critical for extending battery life.
- Microcontroller Power Supply: Provides stable voltage for microcontrollers and digital circuits, ensuring reliable operation.
- RF and Analog Circuits: Used in RF applications and analog signal processing circuits where low noise and high PSRR are essential.
- Consumer Electronics: Employed in various consumer electronic devices, including audio equipment, sensors, and communication devices.

## Conclusion

The STMicroelectronics BD680 is a versatile and efficient low-dropout voltage regulator that offers a combination of low dropout voltage, wide input voltage range, and adjustable output voltage. Its high power supply rejection ratio and low quiescent current make it an excellent choice for a variety of applications, particularly in battery-powered and sensitive electronic devices. With its compact package and robust performance, the BD680 is a valuable component for engineers looking to design reliable and efficient power management solutions in their products.