LP2951-33DRGR

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

LP2951-33DRGR is a low dropout (LDO) voltage regulator which belongs to a specific category of power management integrated circuit (PMIC), more precisely voltage regulators within the linear family. It has a wide temperature range and an output voltage of 3.3V. But, what kind of applications work the best with this type of regulator and what is its basic working principle? The following sections of this article answer to both questions.

Applications of LP2951-33DRGR

LP2951-33DRGR is a versatile regulator which is compatible with many types of applications, both in industrial and consumer grade. Here are some elements it can be used with:

• Battery powered portable electronic devices such as GPS, cellular phones or laptop computers.
• Automotive environments with cold-crank issues
• Smart card readers
• Cameras
• Sensor-based systems
• Telecommunication systems and networks
• Computer peripherals

Its low quiescent current, high efficiency, long term output and line transient responses make this regulator great for battery-operated system. Its closed loop design and 3.2 V to 18 V input range add to the versatility of this type of component, especially when used as a core technology in low-power applications.

Working Principle of LP2951-33DRGR

The LP2951-33DRGR provides a highly reliable, low dropout (LDO) voltage regulation for all kind of DC/DC converter, linear and switch mode requirements. It is based on a traditional pass transistor architecture, using a second order loop to achieve ultra-low dropout levels. The component has a reference voltage (Vref) of 1.25V and a voltage divider, formed by resistors R1 and R2, to adjust the output current to the desired level.

In a non-overloaded condition, the voltage regulator works in a self-mode. The feedback signal from the voltage divider is compared to the reference voltage and, if the two are not equal, the pass transistor will be switched on or off accordingly. This creates a closed loop operation, where the resulting output voltage is proportional to the reference voltage. In overload condition, the overload comparator will be triggered and the regulator will terminate the output voltage.

Finally, the LP2951-33DRGR features a thermal shutdown function. This feature provides an overtemperature protection in order to protect the component and its circuitry. If the temperature of the component exceeds the thermal protection threshold, a signal is sent to the power MOSFET driver, which will switch off the transistor, thus disabling the output.

Conclusion

LP2951-33DRGR belongs to the voltage regulators within the linear family of PMIC components and it is ideal for low power applications such as those powered by batteries and those used in the automotive industry. Its low quiescent current, high efficiency and wide temperature range make this regulator a great choice. Finally, its working principle is based on a traditional pass transistor architecture, combined with a voltage divider, an over-load comparator and a thermal protection mechanism.

The specific data is subject to PDF, and the above content is for reference