LP3985ITLX-2.8/NOPB

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LP3985ITLX-2.8/NOPB is a sophisticated and high-performance linear voltage regulator (PMIC - Voltage Regulators - Linear). This regulator, with its ultra low-power consumption and supersmall package size, packs a high degree of power control and precision in order to efficiently power up a variety of small devices. This article gives an overview of the regulator’s application fields and working principle.

Application Fields

LP3985ITLX-2.8/NOPB is designed for energy efficient portable electronics, such as cell phones, tablet PCs, wearables, and self-powered lighting products. Its internal power MOSFET allows for ultra-low quiescent current (maximum of 15uA) and high efficiency. The finely tuned linear regulator is strong enough to handle loads up to 180mA and enables ultra-low power consumption, dramatically reducing system power consumption and guaranteeing superior battery life.

The miniaturized LP3985ITLX-2.8/NOPB (package size of 2.6mm x 2.6mm) is designed for space-constrained applications, and its maximum drop-out voltage is low enough to guarantee a continuous supply voltage in low-voltage applications, allowing for a high output voltage accuracy. The LP3985ITLX-2.8/NOPB also features a shutdown mode to reduce power consumption.

Working Principle

The internal hysteretic-based P-Channel MOSFET (Power MOSFET) architecture of the LP3985ITLX-2.8/NOPB ensures a very low and continuous power consumption, necessary when powering WLEDs, LCD backlight, and other small loads. The principle of operation of the LP3985ITLX-2.8/NOPB is based on the comparison between the reference voltage (Vref) and the output voltage (Vout), detected at the feedback pins. When the voltage at the feedback pins exceeds the Vref, then the power MOSFET is turned on, increasing the output voltage until it matches the Vref.

The LP3985ITLX-2.8/NOPB is then capable of delivering a continuous output current (up to 250mA) without showing sign of heating up. The output voltage of a linear regulator can be easily adjusted by varying the value of the feedback resistors (R1 and R2). Generally, Vout is given by the formula:

Vout = Vref (1 + (R1/R2))

The feedback voltage (Vref) as well as the drop-out voltage can be conveniently set with external resistors. The LP3985ITLX-2.8/NOPB features a shutdown selective feature, which will terminate the output voltage once commanded, allowing for a power-wise device operation.

Conclusion

LP3985ITLX-2.8/NOPB is a sophisticated and high-performance linear voltage regulator, designed to efficiently power up a variety of small devices. Its highly efficient power MOSFET architecture with ultra low-power consumption and high output current makes it ideal for energy efficient portable electronics. The linear regulator provides a high output voltage accuracy with a wide range adjustable voltage. In addition, the shutdown mode feature enables reduced power consumption and allows for a power-wise device operation.

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