The LTC4267 is a combination of an IEEE 802.3af compliant PoE PD interface with an integrated switching regulator, providing a complete power solution for PD applications.
The LTC4267 combines an IEEE 802.3af‑compliant Power‑over‑Ethernet (PoE) PD interface with a current‑mode switching regulator. It provides a complete power solution for PD applications, including dual‑level inrush current limiting, programmable classification current (Class 0‑4), and thermal overload protection.
The document lists absolute maximum ratings, electrical characteristics, pin assignments, package dimensions, and typical performance curves. It also includes recommended solder‑pad layout for the 16‑lead SSOP and DFN packages and example application circuits for IP phones, wireless access points and security cameras.
| Supply Voltage Range | -48 V to +100 V |
|---|---|
| Peak Output Current (≤10 µs) | 1 A |
The device can operate with a supply voltage up to 100 V on the Vportn pin.
Pin 11 (PWRGD) is the Power Good output, open‑drain.
The classification current is programmable from 10 mA to 40 mA (Class 0‑4).