Maxim Integrated MAX5953BUTM

Description
The MAX5953A/MAX5953B/MAX5953C/MAX5953D are complete power IC solutions for Powered Devices (PD) in Power-Over-Ethernet (PoE) systems, compliant with the IEEE 802.3af standard. They provide PD detection and classification signatures, integrated isolation switch with programmable inrush current control, and a voltage-mode PWM controller with two power MOSFETs in a two-switch voltage-clamped DC-DC converter configuration.

Features
Fully integrated IEEE 802.3af-compliant PD interface
PD detection and programmable classification signatures
Less than 10μA leakage current offset during detection
Integrated MOSFET for isolation and inrush current limiting
Gate output allows external control of the internal isolation MOSFET
Programmable inrush current control
Programmable undervoltage lockout (MAX5953A/MAX5953C)
Clamped, two-switch power IC for high efficiency
Integrated high-voltage 0.42Ω power MOSFETs
Up to 15W output power
Bias voltage regulator with automatic high-voltage supply turn-off
11V to 76V wide input voltage range
Feed-forward voltage-mode control for fast input transient rejection
Programmable undervoltage lockout
Overtemperature shutdown
Indefinite short-circuit protection with programmable fault integration
Integrated look-ahead signal for secondary-side synchronous rectification
>90% efficiency with synchronous rectification
Up to 500kHz switching frequency
High-power (2.22W), 7mm x 7mm thermally enhanced lead-free thin QFN package

Applications
IEEE 802.3af Powered Devices
IP Phones
Internet Appliances
Security Cameras
Computer Telephony
Wireless Access Nodes