National Semiconductor LP2989 Micropower Low Noise, 500 mA Ultra Low-Dropout User Manual Data Sheet
Summary
This precise Low Dropout Regulator (LDO) provides stable, low-noise power output up to 500 mA. Ideal for battery-powered and sensitive electronics applications like portable computing and wireless communication terminals. This guide details the product's features—including ultra-low dropout voltage, guaranteed current capacity, and sleep mode functionality—and covers various connection diagrams, performance specifications, and ordering information needed for accurate design implementation.
Manual Details
| Brand | National |
|---|---|
| Pages | 19 |
| File Size | 607.37 KB |
| Published | June 02, 2026 |
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Frequently Asked Questions
What is the maximum output current and continuous rating?
The device provides a guaranteed 500 mA continuous output current and has a high peak current capability of up to 800 mA typical.
How can I improve output noise?
Output noise can be reduced to 18µV (typical) by connecting an external 10 nF capacitor to the bypass pin.
What is the quiescent current when the device is shut down in Sleep Mode?
In Sleep Mode, the LP2989 draws less than 0.8 µA quiescent current.
Does this regulator offer protection features?
Yes, it includes overtemperature/overcurrent protection and an integrated error flag that drops when output falls about 5% below nominal.