National LP3999 User Guide
Summary
The LP3999 is a low noise voltage regulator ideal for powering sensitive RF and analog circuits in portable, battery-powered devices like cellular phones and MP3 players. This guide provides detailed specifications covering its low dropout capability, virtually zero quiescent current, and high efficiency. It includes application circuit diagrams, pin descriptions (micro SMD & LLP packages), and ordering information necessary for system designers building small-scale electronics with stable power delivery from various battery sources.
Manual Details
| Brand | National |
|---|---|
| Pages | 15 |
| File Size | 333.99 KB |
| Published | May 31, 2026 |
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Frequently Asked Questions
What type of capacitors are required for stable operation?
It is stable with small 1.0 µF output ceramic capacitors and requires a 0.01 µF capacitor on the BYPASS pin.
Does this regulator have internal protection features?
Yes, it includes internal protection against short-circuit and over-temperature conditions.
What are the optimal circuit inputs for power management?
It operates with an input voltage range of 2.5V to 6.0V via the IN pin (C3).