ELECTRONICS: Maxim Integrated Products introduces the MAX5969A/MAX5969B, IEEE(R) 802.3af/at-compliant interface controllers for PoE+ PDs (powered devices). These devices meet all IEEE 802.3at specifications and are backwards compatible with the IEEE 802.3af standard. These controllers can withstand transient voltage spikes up to 100V (abs maximum) without the aid of external components. Additionally, integrated wall-adapter detection circuitry enables the seamless switchover from PoE power to wall power, thus simplifying PD backup-power designs. The MAX5969A/MAX5969B are well suited for high-power applications such as IP phones, wireless LAN access points, IP security cameras, and RFID readers.
These PD interface controllers provide the PD with detection and classification signatures and integrate an isolation power switch with inrush current control. During the inrush period, the devices limit the current to less than 180mA before switching to a higher current limit (720mA to 880mA) when the isolation power MOSFET is fully enhanced.
The MAX5969A/MAX5969B are available in a 10-pin TDFN-EP package and are fully specified over the -40C to +85Cextended temperature range. Prices start at $1.21.
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