The LP3990MFX-3.3 is a high-quality low-dropout linear regulator (LDO) from Texas Instruments, designed to deliver a stable and clean 3.3V output voltage. This regulator is particularly suitable for noise-sensitive applications due to its low output noise and excellent power supply rejection ratio (PSRR).

Key Features

• Output Voltage: Fixed output voltage of 3.3V, which is ideal for powering 3.3V logic in mixed-voltage systems.
• Current Capacity: Capable of delivering up to 150mA of continuous output current, suitable for a range of small to medium power applications.
• Low Dropout Voltage: The LP3990MFX-3.3 has a very low dropout voltage, ensuring efficient operation even when the input voltage is close to the output voltage.
• High PSRR: Excellent power supply rejection ratio minimizes the effect of supply voltage variations on the output voltage, making it ideal for RF and precision analog applications.
• Low Noise: With its low output noise, this LDO is perfect for sensitive applications such as audio or RF circuits where noise can be detrimental to performance.
• Thermal Protection: The device includes thermal shutdown protection, which helps to prevent damage from overheating.
• Stable with Low-ESR Capacitors: The LP3990MFX-3.3 is stable with ceramic capacitors, which have lower equivalent series resistance (ESR) than other types of capacitors, thereby improving output noise performance.

Applications

The LP3990MFX-3.3 is versatile and can be used in a variety of applications, including:

• Battery-powered devices
• Handheld devices
• Portable media players
• Wireless LAN cards
• RF modules

Package and Availability

This LDO comes in a small SOT-23 package, which is suitable for space-constrained applications. The LP3990MFX-3.3 is widely available and can be sourced from Texas Instruments and authorized distributors, ensuring easy integration into your design and procurement process.