NATIONAL SEMICONDUCTOR LP3992 User Guide
Summary
This micro-power CMOS voltage regulator is engineered for reliable, low-noise 1.5V power supply in portable and battery-operated electronics. Featuring industry-leading low quiescent current and robust shutdown control, it ensures stable operation even from minimal input voltages. This guide provides comprehensive technical details, including key specifications, pin descriptions, operational guidelines, and application insights necessary for designing efficient, space-saving circuits. Ideal for engineers developing demanding low-power applications that require stability and extended battery life.
Manual Details
| Brand | National |
|---|---|
| Pages | 9 |
| File Size | 245.37 KB |
| Published | June 18, 2026 |
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Frequently Asked Questions
What type of capacitor should I use for stable output?
Use a ceramic capacitor, preferably in the range of 1µF to 4.7µF, coupled with pin 4 (C).
How do I enter shutdown mode and save power?
Applying a logic signal to Pin 3 (SD) when it drops below 0.4V disables the regulator, reducing standby power consumption nearly to zero.
What is the operational temperature range for the LP3992?
The device guarantees stable operation within a junction temperature range of -40°C to +125°C.
Can this voltage regulator handle low input voltages?
Yes, it operates stably with an input voltage ranging from 1.9V up to 5.2V.