The MAX5969A and MAX5969B IEEE 802.3af/at-compliant interface controllers for PoE+ powered devices (PDs) can withstand transient voltage spikes up to 100V max without the aid of external components. Integrated wall-adapter detection circuitry enables a switchover from PoE to wall power, thereby simplifying backup-power designs. Both 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 180 mA before switching to a higher current limit, 720 mA to 880 mA, when the isolation power MOSFET is fully enhanced. Available in 10-pin TDFN-EP packages, prices start at $1.21 each/1,000. MAXIM INTEGRATED PRODUCTS, Sunnyvale, CA. (800) 998-8800.
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