PM8800

PM8800 Integrated IEEE 802.3af compliant PoE-PD interface and PWM controller with support of external source Preliminary Data Features ■ IEEE 802.3af compliant PD Interface ■ Works with power supplied from Ethernet LAN cables or from local auxiliary sources ■ Integrated 100V, 0. 5Ω, 800mA 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. Applications ■ VoIP phones, WLAN access points ■ Security cameras ■ PoE Powered Device Appliances ■ High power (>12.95W) powered devices Table 1. Device summary Order codes PM8800A PM8800A Max duty 80% HTSSOP16 Description The PM8800 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. PM8800 specifically targets PD with extended power requirement with respect to the limit imposed by the 802.3af standard, embedding a hot-swap MOSFET cap...