LP3987ITLX-2.85/NOPB

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The LP3987ITLX-2.85/NOPB, a three-terminal, low-dropout (LDO) linear voltage regulator from Texas Instruments, is categorized as a PMIC - Voltage Regulators - Linear, and has a wide range of applications. This article will explain the working principle of the device and introduce its primary application field, enabling engineers to easily design with it.

Overview of the LP3987ITLX-2.85/NOPB

The LP3987ITLX-2.85/NOPB is a LDO linear voltage regulator. It is a fast and low quiescent current regulator with a wide input voltage range from 3 V to 18 V and output voltage from 0.6 V to 13.5 V. It also offers an adjustable output voltage and current limiting wide output up to 2 A.

The regulator provides good power supply noise rejection, achieving 78 dB of power supply rejection ratio, while delivering low output voltage noise and ripple with high power supply rejection. It features low dropout voltage of 200 mV at 2 A and is designed to supply high current loads with low output noise and high power supply rejection.

The device is designed and built using advanced BiCMOS process and high-voltage CMOS technology, which simplifies the design process and reduces power consumption. It is offered in a 3 mm x 3 mm, 8-lead SOT-23 (ThinSOT™) package.

Working Principle of LP3987ITLX-2.85/NOPB

The working principle of the LP3987ITLX-2.85/NOPB is based on the idea of a linear regulator. This type of regulator works by taking a provided voltage and reducing it to the desired level. It is comprised of two main components: an error amplifier and a pass transistor. The error amplifier monitors the output voltage, and if it is not at the desired level, it activates the pass transistor, which regulates the amount of current allowed to flow through the regulator.

The error amplifier compares the output voltage to a reference voltage, and then adjusts the base level of the pass transistor according to the difference between the two voltages. If the output voltage is higher than the reference voltage, the base level is increased, which lowers the current allowed to flow through the regulator. Conversely, if the output voltage is lower than the reference voltage, the base level is decreased, which allows more current to flow. By using this technique, the output voltage is maintained at a fixed value, regardless of the input voltage or load.

Application Field of LP3987ITLX-2.85/NOPB

The LP3987ITLX-2.85/NOPB is well suited for a wide range of applications, from powering consumer electronics such as cell phones and tablets, to more demanding applications such as industrial equipment, automotive systems, and power management in portable electronics. The device is ideal for low voltage, high current designs and applications where a low dropout voltage is desired.

In consumer applications, the LP3987ITLX-2.85/NOPB is used to provide power to microprocessors, ASICs, and system monitors. It is also used to regulate the batteries in portable applications, providing low quiescent current and high power supply rejection ratio. Additionally, its wide input voltage range allows it to be used in space-constrained environments, where there may be varying input voltages.

In automotive and industrial applications, the LP3987ITLX-2.85/NOPB is well suited for providing power to low voltage circuits such as relays, sensors, and motor control circuits. In addition, its low dropout voltage and adjustable output voltage make it an ideal choice for automotive power systems and industrial automation.

Conclusion

The LP3987ITLX-2.85/NOPB, a three-terminal, low-dropout (LDO) linear voltage regulator from Texas Instruments, is categorized as a PMIC - Voltage Regulators - Linear, and has a wide range of applications. It is suitable for a wide range of consumer, automotive, and industrial applications and offers good power supply noise rejection and low output voltage noise and ripple with high power supply rejection. The device is designed and built using advanced BiCMOS process and high-voltage CMOS technology and is offered in a 3 mm x 3 mm, 8-lead SOT-23 (ThinSOT™) package. This article has explained the working principle of the device and introduced its primary application field.

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