Texas Instruments

LP2989AILD-3.3  

Linear & Switching Voltage Regulators

LP2989AILD-3.3 Description

The LP2989AILD-3.3 from Texas Instruments is a fixed-output, low-dropout (LDO) linear voltage regulator designed to deliver a stable 3.3V output with a maximum current of 500mA. It operates with an input voltage range up to 16V, making it suitable for a variety of power supply applications. The device features a low dropout voltage of 0.65V at 500mA, ensuring efficient performance even with minimal headroom. With a quiescent current of 175 µA and a supply current of 9 mA (max), it is optimized for power-sensitive designs. The regulator is housed in an 8-pin WSON package and is available in Tape & Reel (TR) for automated assembly.

LP2989AILD-3.3 Features

• High PSRR (60dB at 1kHz): Ensures excellent noise rejection, ideal for sensitive analog and RF circuits.
• Enable Control: Allows for power management via an external logic signal, reducing standby power consumption.
• Robust Protection: Includes over-current, over-temperature, and short-circuit protection for enhanced reliability.
• Low Quiescent Current (175 µA): Minimizes power loss in battery-operated applications.
• Moisture Sensitivity Level (MSL 1): Suitable for extended storage and handling without baking requirements.
• Compact WSON Package: Space-efficient for modern PCB designs.

LP2989AILD-3.3 Applications

The LP2989AILD-3.3 is ideal for applications requiring a stable, low-noise power supply, such as:

• Portable and battery-powered devices (e.g., IoT sensors, wearables) due to its low Iq and dropout characteristics.
• Industrial control systems where high PSRR is critical for noise-sensitive components.
• Automotive electronics (non-safety-critical) leveraging its wide input range and robust protection features.
• Embedded systems requiring reliable voltage regulation with minimal external components.

Conclusion of LP2989AILD-3.3

The LP2989AILD-3.3 stands out as a high-performance LDO regulator, offering a balance of efficiency, noise immunity, and protection features. While marked as obsolete, its design advantages—such as low dropout, enable control, and compact packaging—make it a viable choice for legacy or specific applications where these attributes are critical. Engineers should evaluate alternative TI LDOs for new designs but can rely on this regulator for proven performance in existing systems.

LP2989AILD-3.3 Documents

Download datasheets and manufacturer documentation for LP2989AILD-3.3

Datasheets :

LP2989 Datasheet