NATIONAL SEMICONDUCTOR LM27241 User's Manual
Summary
The LM27241 is a high-speed, synchronous buck regulator controller designed for low-voltage power management in battery-powered mobile electronics, such as laptops and notebooks. It efficiently steps down voltage from 5.5V to 28V with an adjustable output down to 0.6V. The manual provides comprehensive technical guidance covering advanced features like soft/hard start sequencing, lossless current sensing, and detailed layout guidelines for reliable circuit design. This resource is essential for electrical engineers and hardware designers building next-generation mobile power systems.
Manual Details
| Brand | National |
|---|---|
| Pages | 27 |
| File Size | 1.31 MB |
| Published | May 27, 2026 |
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Frequently Asked Questions
How should the Soft-start capacitor be implemented?
A Soft-start capacitor is placed between Pin 2 (SS) and ground, along with a recommended 1.8kΩ resistor R.
What range of input voltage can this regulator handle?
The LM27241 supports an input voltage range from 5.5V to 28V.
How is the switching frequency determined or adjusted?
The nominal frequency is set by a resistor connected between Pin 3 (FREQ) and ground; increasing this resistance decreases the frequency.
What happens if there is an under-voltage fault condition?
If the lower FET voltage drops below the UVLO threshold, the outputs are latched OFF, and Power Not Good (PGND) is signaled immediately.