LP2981AIM5-3.6

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Linear Voltage Regulators are power management integrated circuit (PMIC) devices used to manage and control different power stages and to provide a stable DC power supply voltage to anyelectronic circuit board. The LP2981AIM5-3.6 is an upgradeable low-dropout (LDO) linear voltage regulator that provides a regulated voltage of up to 3.6VDC with ultra-lownoise, high accuracy, and low dropout voltage performance. In this article, we will cover the application fieldand working principle of the LP2981AIM5-3.6.

Application Field

The LP2981AIM5-3.6 is mostly used as a system power supply management component in smart sampling and recording devices, diagnostic equipment, portable terminal devices, electro-optical instruments, and micro-computer detection controls. Its primary application is for power supply design in battery powered 10mA to 250mA portable device equipment.

The LP2981AIM5-3.6 is also suitable for a wide range of hardware applications. Ithas anhigh end-stability rating and ultra-low output noise, hence making it suitable in a wide range of high-end industrial applications such as circuit boards for computer motherboards, data acquisition systems, vehicle telecommunication switching, satellites, and other sensitive electronics.

Working Principle

The LP2981AIM5-3.6 is based on a 3-terminal linear regulator circuit which uses a LMV431 reference voltage. The LMV431 reference voltage is a low-frequency, low-power bandgap voltage reference available with a voltage between 1V and 6V. The reference voltage is further amplified and then connected to the emitter of a pnp analog transistor. The base of the transistor is biased and the collector is connected to the output terminal.

Theinput voltage is applied to the base of another npn analog transistor, whosecollectoris connected to the output terminal of the regulator and whose emitter is connected to the base of the pnp transistor. When the voltage is applied to the base of the npn transistor,the current will flow from the input to the output, thus resulting in a regulatedoutput voltage. This regulatedvoltage is further amplified and stabilized usingthe LMV431 reference voltage as the voltage reference for the regulator.

The LP2981AIM5-3.6 also features precise current limit, over temperature limit, and undervoltage lockout. The precise current limit feature is used to protect the device from excessive current draw. The over temperature limit feature protects the device by limiting the junction temperature. The undervoltage lockout feature is used to prevent the device from starting operation when the input voltage is below the specified levels.

Conclusion

The LP2981AIM5-3.6 is a low-dropout linear voltage regulator which provides a regulated voltage of up to 3.6VDC with ultra-low noise, high accuracy, and low dropout voltage performance. It is most commonly used in smart sampling and recording devices, diagnostic equipment, portable terminal devices, electro-optical instruments, and micro-computer detection controls. Furthermore, its precise current limit, over temperature limit, and undervoltage lockout features ensure reliable operation in challenging environments.

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