PM8800A

PM8800A Integrated IEEE 802.3af compliant PoE-PD interface and PWM controller with support of external source Features ■ IEEE 802.3af compliant PD interface ■ Works with power supplied from Ethernet LAN cables or from local auxiliary sources ■ Integrated 100 V, 0.5 Ω, 800 mA hot-swap MOSFET ■ Integrated signature resistor ■ Programmable in-rush current limit ■ Programmable classification current ■ Programmable DC current limit up to 800 mA ■ High voltage start-up bias regulator ■ Thermal shutdown protection ■ Current mode pulse width modulator ■ Programmable oscillator frequency ■ Programmable soft-start ■ Power good indication ■ 80 % maximum duty cycle with internal slope compensation ■ Supports both isolated and non-isolated Applications. ■ HTSSOP16 package Applications ■ VoIP phones, WLAN access points ■ Security cameras ■ PoE powered device appliances ■ High power (>12.95 W) powered devices HTSSOP16 Description The PM8800A integrates a standard power over Ethernet (PoE) interface and a current mode PWM controller to simplify the design of the power supply sections of all powered devices. The PoE interface incorporates all the functions required by the IEEE 802.3af including detection, classification, under-voltage lockout (UVLO) and in-rush current limitation. PM8800A specifically targets PD with extended power requirement with respect to the limit imposed by the 802.3af standard, embedding a hot-swap MOSFET capable of sustaining twice the current of the 802.3af standar...