NATIONAL SEMICONDUCTOR LM2771 User Guide
Summary
The LM2771 is a high-efficiency, low-ripple switched capacitor step-down DC/DC converter designed to provide a stable 1.5V power output from an input range of 2.7V to 5.5V, eliminating the need for bulky inductors. This manual details its technical characteristics, covering advanced operation modes, efficiency comparisons (up to 81%), and reliability features like thermal protection. Ideal for engineers developing miniature portable electronics, mobile phones, and low-power processor supplies that require excellent efficiency and minimal noise in a small footprint.
Manual Details
| Brand | National |
|---|---|
| Pages | 10 |
| File Size | 890.45 KB |
| Published | May 29, 2026 |
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Frequently Asked Questions
Does the LM2771 require an inductor?
No, it is a switched capacitor step-down regulator that produces a 1.5V output without the use of an inductor.
What are the recommended operating voltage ranges?
The input voltage range should be 3.0V to 5.5V, and it operates at a fixed 1.5V output voltage.
How is efficiency maintained at low load currents?
When output currents are below <30mA typical, the device automatically switches to a low-ripple PFM regulation mode.
How do I activate or disable the unit?
Applying a logic HIGH voltage signal enables the part, while a logic LOW voltage signal places it in shutdown.