The LP5990TM-1.8 is a low-dropout (LDO) voltage regulator from Texas Instruments (TI), formerly National Semiconductor. This regulator is designed to provide a stable and accurate 1.8V output voltage from a higher input voltage. It is characterized by its low quiescent current and small size, making it suitable for portable and battery-powered applications where efficiency and space are critical.

Applications:

• Mobile Phones: Powering core logic and peripherals in smartphones.
• Tablets: Supplying regulated voltage to various components within tablet devices.
• Wearable Devices: Used in smartwatches, fitness trackers, and other wearable electronics.
• Portable Media Players: Providing power to the processor and display in portable media players.
• Low-Power Microcontrollers: Regulating the power supply for low-power microcontroller applications.

Features:

• Low Dropout Voltage: Maintains regulation with a small difference between the input and output voltage.
• Low Quiescent Current: Minimizes power consumption in idle mode, extending battery life.
• Stable with Ceramic Capacitors: Stable operation with small ceramic output capacitors, reducing component size and cost.
• Overcurrent Protection: Protects the regulator and the load from overcurrent conditions.
• Overtemperature Protection: Protects the regulator from damage due to overheating.
• Enable Pin: Allows for turning the regulator on and off to conserve power.

Benefits:

• Long Battery Life: Low quiescent current extends battery life in portable devices.
• Stable Output Voltage: Provides a stable and accurate output voltage for reliable operation of electronic components.
• Small Size: Compact package enables use in space-constrained applications.
• Robust Protection: Protects the regulator and the load from various fault conditions.
• Simplified Design: Requires minimal external components, simplifying PCB layout.

Specifications: The LP5990TM-1.8 delivers a fixed 1.8V output voltage with a typical output current of up to 150mA. It has a low dropout voltage, typically less than 200mV at the rated output current. The quiescent current is typically in the microamp range. The device is available in a small SOT-23 package. Consult the Texas Instruments LP5990 datasheet for detailed electrical characteristics, thermal performance, and application circuit examples.