SG7915T

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The SG7915T linear regulator is a 3-pin voltage regulator that operates in a wide range of input voltage, typically 3V to 45V. It can regulate an output voltage within ±3% of the Vref terminal voltage, which is also known as the reference voltage. The SG7915T is a highly efficient, high-speed voltage regulator with a wide range of operational benefits compared to other linear regulators. It can easily adjust the output voltage in response to changes in input voltage and load conditions, making it an ideal choice for applications requiring extremely low output voltage regulation accuracy and ultra-low noise operating conditions.

Features

• Wide input voltage range from 3 V to 45 V
• Very low output voltage ripple
• Very low output noise level
• High efficiency, up to 95%
• High-speed voltage regulation, up to 1 kV/µs
• Very low output voltage temperature coefficient
• Very low output voltage temperature drift
• Protection against input voltage transient peaks
• Ultra-low dropout operation down to 1.2 V

Applications

The SG7915T is a versatile regulator, with a range of applications in a variety of industries. Many audio amplifiers, active and passive musical instruments, and Bluetooth devices require a very low or no noise output voltage. The SG7915T is an ideal choice for these applications due to its exceptional high-speed voltage regulation and ultra-low noise operation. Its wide input voltage range and ultra-low dropout operation make it an excellent choice for medical systems and systems requiring ultra-low standby power operation. The regulation accuracy and high efficiency of the SG7915T make it the perfect choice for low-power microprocessor and microcontroller systems, providing stable and reliable voltage regulation with minimal power dissipation.

Working Principle

The SG7915T linear regulator operates as a constant output voltage by comparing the output voltage to Vref using an internal differential amplifier. The output voltage is regulated by controlling the conduction of an integrated power N-MOSFET. When the input voltage decreases, the differential amplifier will increase the conduction of the N-MOSFET, increasing the voltage drop across the regulator, thus raising the output voltage to return it to the value set by Vref. Conversely, when the input voltage increases, the differential amplifier will decrease the conduction of the N-MOSFET, decreasing the voltage drop across the regulator, lowering the output voltage.

The SG7915T is designed for noise sensitive applications, so special care was taken to minimize noise generation. The internal voltage references and voltage reference bypass network have been optimized to minimize the noise output of the regulator. To further reduce output noise, an internal LDO (Low Dropout) topology is used. The LDO topology reduces the power dissipation by using less current than the traditional linear topology, resulting in a much lower noise output.

Conclusion

The SG7915T linear regulator is a versatile voltage regulator with a variety of operational benefits and a wide range of applications. It is capable of providing highly efficient, low noise operation at high-speed, while maintaining an extremely low dropout operation. The SG7915T is an excellent choice for any application requiring low voltage regulation accuracy and ultra-low noise operating conditions.

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