NATIONAL SEMICONDUCTOR LM5070 User Manual
Summary
This integrated circuit provides a complete solution for interfacing Powered Devices (PD) within Power over Ethernet (PoE) systems, ensuring compatibility with IEEE 802.3af standards. The manual details how the chip combines a robust internal MOSFET switch and an advanced PWM controller to manage complex power requirements. Ideal for engineers designing connected devices, it offers programmable controls like Under-voltage Lockout thresholds, customizable inrush current limits, and selectable duty cycle options (50% or 80%) for reliable, integrated power management in both isolated and non-isolated applications.
Manual Details
| Brand | National |
|---|---|
| Pages | 17 |
| File Size | 833.98 KB |
| Published | June 16, 2026 |
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Frequently Asked Questions
What are the maximum duty cycle options available for this device?
The LM5070 is available with either an 80% or a 50% maximum duty cycle limit, depending on the suffix (-80 or -50).
How is the inrush current limited when setting up the device?
Program the inrush current limit using the RCLP pin; if left open, the default limit is set to 400mA max.
Does the component comply with industry power standards?
Yes, it features a fully IEEE 802.3af compliant Power over Ethernet (PoE) interface port.
What safety warnings are provided for critical medical applications?
The products are not authorized for use as critical components in life support devices or systems without the express written approval of National Semiconductor Corporation.