NCV8503PW33G

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NCV8503PW33G Application Field and Working Principle

The NCV8503PW33G, manufactured by ON Semiconductor, is a linear voltage regulator, part of the PMIC voltage regulator family. It is a low dropout (LDO) voltage regulator which is capable of providing an output voltage as low as 1.2V to 6.0V within a wide input voltage range of 2.5V to 6.0V. Its primary purpose is to provide a very precise voltage output supply, with a tight line and load regulation of less than 0.2% characteristic over the temperature range from -40 to 125°C. This voltage regulator is monolithic and available in a 3 mm x 3 mm SON and 2.4 mm x 2.4 mm WLCSP package.

Application Field of the NCV8503PW33G

The NCV8503PW33G is ideal for applications requiring precision voltage regulation combined with low power loss. Its primary benefit makes it suitable for use in any application where an adjustable low-dropout linear regulator is required, such as adjustable and fixed voltage supplies, power management systems, power conditioning, AA/AAA battery chargers, serial bus termination, and stand-by/back-up circuits.

How the NCV8503PW33G Works

The NCV8503PW33G is composed of two major parts: an error amplifier and a series pass element. The error amplifier does exactly that, it amplifies any error in the output voltage with respect to it\'s programmed value. This amplified error signal is sent to the series pass element which is effectively a switch. Or more specifically, it is an NMOS power transistor that turns on and off to hold the output voltage at the programmed voltage.

The series pass element has a voltage accuracy regulation that is achieved by comparing an internal reference voltage to an external resistor (R1/R2) voltage divider connected at the regulator’s adjustment pin. This voltage divider is programmed to the desired output voltage. If the output voltage is higher than programmed, the error amplifier forces the series pass element to reduce the current that is flowing through it until it reaches the desired voltage.

The NCV8503PW33G also has two other pins for current limiting and thermal shutdown. Current limiting is enabled using an external resistor connected to the current limit pin. Once detected, it will reduce the input voltage, limiting the output current. Thermal shutdown will make sure that the regulator is not running at temperatures that could damage the circuitry or cause dangerous conditions. If the temperature of the device exceeds a certain threshold, the regulator will reduce the output voltage until the temperature is back to a safe level.

Conclusion

The NCV8503PW33G is a low dropout (LDO) voltage regulator with state-of-the-art accuracy and very low power losses. Its precise output voltage and tight line and load regulation make it suitable for a wide variety of applications requiring precision voltage regulation. Its external components are few and easy to adjust and configure, putting it in an excellent position to bring a reliable and precise power supply to any system.

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