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LP3891EMR-1.2/NOPB Application Field and Working Principle

The LP3891EMR-1.2/NOPB is an Always-on Low Dropout (LDO) linear voltage regulator supplied by Texas Instruments. It is categorized as a PMIC (power management integrated circuit) and belongs to the linear voltage regulator family. This IC functions as a low-voltage regulator that is used to provide an accurate voltage output of 1.2V. It operates within the temperature range of -40℃ to 125℃ and uses an ultra-low quiescent current of 180uA. The LP3891EMR-1.2/NOPB contains various built-in protection features such as reverse battery protection, current limit, thermal shutdown and overvoltage protection. The LP3891EMR-1.2/NOPB was designed for use in mobile and consumer products such as tablet PCs and media players.

LP3891EMR-1.2/NOPB Specifications

The LP3891EMR-1.2/NOPB features a maximum output current of 1.5A and a maximum dropout voltage of 0.14V. The output voltage is adjustable at ± 2% of the nominal output voltage. The device has a maximum current limit of 2.3A and a minimum current limit of 1.65A. It also has a voltage range of 0.8V to 5.5V and an output voltage temperature band of ± 6%. The device has a high power supply rejection ration of 82dB at 5kHz.

LP3891EMR-1.2/NOPB Features

The LP3891EMR-1.2/NOPB boasts a wide range of features which make it an ideal choice for a variety of applications. These features include an ultra-low quiescent current of 180uA, a wide input voltage range of 0.8V to 5.5V, an output voltage temperature band of ± 6%, a reverse battery protection, a high power supply rejection ration of 82dB at 5kHz, a maximum output current of 1.5A and a maximum dropout voltage of 0.14V.

LP3891EMR-1.2/NOPB Working Principle

The LP3891EMR-1.2/NOPB works on the same principle as other linear voltage regulators. It takes an input voltage and regulates it down to a lower output voltage. Normally, the input voltage is regulated by a series pass transistor as current passes through one part of the circuit. The output voltage is regulated by a voltage divider network, which divides the input voltage into a lower output voltage. The output voltage is further regulated by an error amplifier whose output is compared to the reference voltage. When the output voltage deviates from the reference voltage, the output of the error amplifier is adjusted accordingly. This adjustment causes the series pass transistor to switch on or off, allowing more or less current to pass through, thus regulating the output voltage.

Conclusion

The LP3891EMR-1.2/NOPB is a linear voltage regulator supplied by Texas Instruments, categorized as a PMIC (power management integrated circuit). It is an always-on low dropout (LDO) voltage regulator and provides an accurate 1.2V output voltage. This IC has an ultra-low quiescent current of 180uA and boasts a wide range of features such as a wide input voltage range, reverse battery protection, a high power supply rejection ration and more. It works on the same principle as other linear voltage regulators, utilizing a series pass transistor, voltage divider and error amplifier for its operation.

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