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National Semiconductor LM5070 Integrated Power over Ethernet PD Interface and PWM Controller Datasheet
The LM5070 is a fully IEEE 802.3af‑compliant power interface and pulse‑width‑modulation controller for Powered Devices in Power over Ethernet (PoE) systems. It integrates an 80 V, 400 mA internal MOSFET switch, programmable inrush current limit, classification current, and under‑voltage lockout, providing a complete solution for PoE power sequencing.
Key features include selectable maximum duty‑cycle limits (80 % with slope compensation or 50 % without), an 800 mA peak gate‑driver, and support for both isolated and non‑isolated applications. The device is offered in TSSOP‑16 and LLP‑16 packages, with detailed electrical characteristics and thermal specifications provided for designers.
National Semiconductor LM5070 specifications
| Maximum duty cycle (‑80 device) | 80 % |
|---|---|
| Maximum duty cycle (‑50 device) | 50 % |
| Peak gate driver current | 800 mA |
| Operating temperature range | -40 °C to +125 °C |
All National Semiconductor LM5070 documents by type
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in these manuals
What is the maximum duty cycle for the LM5070‑80 device?
The LM5070‑80 device supports a maximum duty cycle of 80 % with slope compensation.
What is the peak gate‑driver current of the LM5070?
The LM5070 provides an 800 mA peak gate‑driver current.
What is the maximum input voltage for the LM5070?
The LM5070 is rated for a maximum input voltage of 80 V.
From: National Semiconductor LM5070 Integrated Power over Ethernet PD Interface PWM Controller Datasheet