Linear voltage regulators are essential components in many electronic devices, from battery-powered gadgets to industrial machines. Their primary function is to stabilize the output voltage from a power source, typically a DC power supply or battery, and to filter out any ripple or noise that may affect the performance of the downstream circuit. There are many types of linear regulators available, but the PQ20RX11 from Sharp Microelectronics stands out for its flexibility and robustness.
The PQ20RX11 is a positive, adjustable linear regulator that can deliver up to 1A of current to the load. It has a wide input voltage range, from 4.5V to 24V, and can output a voltage anywhere between 3V and 20V, depending on the external resistor network. The dropout voltage of the regulator is only 0.5V at 500mA, which means that it can operate efficiently even when the input voltage is close to the output voltage. One of the benefits of the PQ20RX11 is its low quiescent current, which is only 8mA. This means that the regulator consumes very little power when it is idle, and hence, prolongs the battery life of the device. The regulator also has excellent line and load regulation, which means that the output voltage remains stable even when the input voltage or load current varies.
Furthermore, the PQ20RX11 has a high PSRR of 45dB at 120Hz, which makes it immune to power supply noise. The PQ20RX11 also has some useful features for control and protection. It has an enable pin that can be used to turn the regulator on or off, thereby conserving the battery power when the device is not in use. The regulator also has built-in thermal and current protection circuits that prevent it from overheating or overloading, and hence, ensure safety and reliability.
So where can you use the PQ20RX11? The answer is almost anywhere. This linear regulator is suitable for a wide range of applications, such as battery chargers, power supplies, audio amplifiers, LED drivers, and motor controllers. For instance, you can use the PQ20RX11 to design a simple and efficient USB charger for your smartphone or tablet, or to power a small audio amplifier for your DIY speaker project. You can also use the regulator as a constant current source to drive a high-power LED, or as a voltage regulator for a low-power motor.
In summary, the PQ20RX11 is a versatile and reliable linear voltage regulator that offers adjustable output voltage, low dropout voltage, low quiescent current, and excellent regulation and protection features. Its compact and robust package makes it easy to integrate into your electronic projects, and its wide range of applications makes it a useful component to have in your toolkit. Whether you are a hobbyist, a student, or an engineer, the PQ20RX11 can help you achieve your electronic goals with ease and confidence.
