SPX2815AT-L

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A voltage regulator is a device used to maintain a constant voltage level regardless of the fluctuating input voltage levels. In percentage terms, the difference between the output and input voltages is called the voltage regulation. PMICs with integrated linear voltage regulation units can be used to set a fixed voltage, making them suitable for battery charging and critical applications. The SPX2815AT-L is an example of a linear PMIC voltage regulator.

Features

The SPX2815AT-L is 3-Terminal low dropout (LDO) linear regulators with a maximum output current of 500mA, internal reference voltage of 5.0V, and adjustable output voltage from 1.2V to 5.0V. It has a low ground pin current of 10.0 µA, high power supply rejection ratio of 70dB, 30nA typical output noise voltage and 8.5mV typical dropout voltage at 500mA output current. Furthermore, the regulator has short-circuit protection and thermal shutdown feature to safeguard the device against future damages.

Application Fields

The SPX2815AT-L provides low dropout voltage and low ground pin current, making it suitable for battery-powered applications. This device can also be used in digital and analog circuits powered by logic and microcontrollers. Additionally, it can be used in digital broadcasters and electronic devices with strict power requirements. By setting the right output voltage, the SPX2815AT-L can also be used for gate drivers and power management in automotive applications.

Working Principle

The SPX2815AT-L is a linear voltage regulator which works by regulating the output voltage and maintaining the current a constant level. It compares the output voltage to its internal reference voltage, and adjusts it to maintain the constant voltage. When the input voltage is higher than the output voltage, then the excess energy is used to drive the electronic components in the circuit, while the same excess energy is dissipated in the form of heat if the output voltage is higher than the input voltage.

The SPX2815AT-L uses a PNP open circuit transistor to regulate the output voltage. The transistor is placed between the output and the error amplifier comparator to control the current flow between them. When the comparator detects an error in the output voltage, it adjusts the base current of the PNP transistor to compensate for the error. The output voltage is then regulated and maintained as constant as possible.

Conclusion

The SPX2815AT-L is a linear PMIC voltage regulator designed for battery-powered applications and low-voltage, low-current digital and analog circuits. It features a 500mA maximum output current, 5.0V internal reference voltage, and an adjustable output voltage range from 1.2V to 5.0V. The regulator has short-circuit protection and thermal shutdown feature to safeguard the device against future damages. It is also equipped with a PNP open circuit transistor to regulate the output voltage, providing stable voltage and current levels by adjusting the base current of the transistor whenever an error is detected.

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