LP3990TL-1.8/NOPB

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LP3990TL-1.8/NOPB is a Linear Voltage Regulator integrated circuit falling under the category of Power Management Chips (PMICs). The device consists of a low-dropout (LDO) linear regulator and a shut-down (SD) control circuit and can be used to convert unregulated voltages from 9V to 36V into 1.8V. It can deliver currents up to 50mA (according to the manufacturer).

Applications of LP3990TL-1.8/NOPB include providing regulated output voltages with low power consumption to microcontrollers and digital signal processes, with the added benefit of being able to shut down the linear regulator upon demand. It is, therefore, perfect for applications where low quiescent current is desired, such as in battery-powered projects.

The digital logic output (SDO) of LP3990TL-1.8/NOPB can be used to activate the shut-down mode (SHUTDOWN). When active, this feature reduces the output current to less than 0.1μA. This can be either done manually (by the user) or digitally. It also has an open-drain output for interfacing and logic level shifting. Additional features include over-temperature protection, power supply rejection and output voltage accuracy.

The working principle of LP3990TL-1.8/NOPB can be summarised as follows: When in normal active operation, it maintains the output voltage within a pre-determined reference voltage. When a ‘shutdown’ mode is requested, the current is reduced to near zero. It is important to keep in mind that the regulator should be stable enough to maintain the output voltage while under varying input voltages and load currents.

In conclusion, LP3990TL-1.8/NOPB is an ideal choice for applications involving low power consumption, such as embedded and battery-powered projects. Its features include output voltage accuracy, over-temperature protection, power supply rejection and its ability to shut down the linear regulator upon demand. The device works by maintaining a pre-determined reference voltage in normal operation, with the ability to reduce the current to near zero when the shutdown mode is activated.

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