LP2951CM-3.3

Introduction

LP2951CM-3.3 is a Low-Dropout (LDO) linear voltage regulator, designed specifically for powered systems in portable and mobile applications. It offers a maximum output voltage of 3.3v and operates in a range from 2.5v to 12v. It is also a very efficient regulator since its quiescent current is very low, typically 0.25mA.

Application Field

The LP2951CM-3.3 is a low power voltage regulator, perfect for low voltage powered systems. It is perfect for powering core components in a system such mobile phones and PDAs; where the power source is often fluctuating, causing power drops in the component. The LP2951CM-3.3 adjusts the power supply to the desired output voltage of 3.3V, ensuring proper voltage supply to the component, thus providing reliable performance.

In addition to its low power usage, the LP2951CM-3.3 is also designed for use in systems where power generation noise needs to be suppressed during power supply transients. The LP2951CM-3.3 is designed with noise reduction features, such as shunting noise to the ground and filtering the output voltage line. This feature makes it the perfect linear voltage regulator for powering multiple operations from a noisy power line.

Finally, the LP2951CM-3.3 is also perfect for use in systems that require a low drop out voltage regulator, since it only needs a minimum input voltage of 2.5V. This is an important factor when powering a system directly from a low power source, such as a single cell battery.

Working Principle

The LP2951CM-3.3 works on the principle of linear regulation. When the input voltage is given to the regulator, the input voltage passes through a low pass filter, which filters out any high frequency noise. The filtered voltage then passes through a voltage reference and after that into a control loop amplifier. The output from the control loop amplifier is given as input to transistor, which acts as a switch. The transistor uses this output to regulate the voltage and output the desired output voltage of 3.3V.

The LP2951CM-3.3 also has current limiting feature, which is enabled when the output current reaches 1.8A. This feature is useful for protecting the regulator from any short circuiting. The regulator has a maximum output current of 3A.

Conclusion

The LP2951CM-3.3 is a low power, low drop out linear voltage regulator, perfect for low power applications. Its low quiescent current and noise reduction features make it perfect for portable and mobile applications. Its current limiting feature provides safety when used with a short circuit. This also makes it perfect for use in more temperature sensitive applications such as small microcontrollers.