NCP500SQL18T1G

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NCP500SQL18T1G Application Field and Working Principle

The Linear Voltage Regulator (LVR) is used in a variety of applications, and the NCP500SQL18T1G is a product of ON Semiconductor, targeted for use in highly efficient, low dropout applications such as automotive, communications, and mobile products. Specifically, it is used as a regulator in point-of-load (POL) supplies, blue tooth modules, cellular phones, tablet PCs, instrumentation, and other applications requiring low power consumption.

Features

The NCP500SQL18T1G features an integrated low dropout regulator (LDO) in an 8-pin SOT-23 package that is smaller and provides better thermal performance than competitive products. With a dropout voltage of 150 mV, the regulator can operate with a voltage supply as low as 1.8 V, providing regulated output currents up to 800 mA. Its fast transient response and internal reverse current protection make the NCP500SQL18T1G an excellent choice for applications that require efficient and cost effective power conversion.

The NCP500SQL18T1G also provides:

• System cost reduction via high-performance solution with low component count and low power thermals
• Low power consumption to meet power conservation requirements
• Small, 8-pin SOT-23 package for space-saving board area
• High noise immunity with a wide range of input/output voltages
• Reverse current protection to ensure proper system operation

Working Principle

The NCP500SQL18T1G is a linear voltage regulator circuit that regulates the output voltage. It has an integrated comparator circuit which monitors the output voltage and compares it with the voltage set point. The set point is set by an external resistor divider and is typically set to the desired output voltage from the regulator. When the output voltage deviates from the set point, the comparator generates at an internal control voltage. This control voltage is then compared to an internal reference voltage, and the difference is amplified by an internal transconductance amplifier to regulate the output voltage.

The NCP500SQL18T1G also includes an internal reverse current protection circuit to prevent overcurrent from flowing from the input to the output, as well as protection from overvoltage, over temperature, and short circuit. Additionally, the NCP500SQL18T1G features a fast transient response, due to its optimized supply-rejection transfer characteristics and an active Miller response.

Conclusion

The NCP500SQL18T1G is a linear voltage regulator designed for maximum efficiency in low dropout applications, such as automotive, communications, and mobile products. It has a small 8-pin SOT-23 package which provides excellent thermal performance and board area savings. It features low output voltage drop, wide operating range, fast transient response, and reverse current protection, making it an ideal choice for applications that require efficient and cost effective power conversion.

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