MAX5953A, MAX5953B, MAX5953C, MAX5953D IEEE 802.3af PD Interface And PWM Controllers With Integrated Power MOSFETs

The MAX5953A MAX5953B MAX5953C MAX5953D integrate a complete power IC solution for Powered Devices (PD) in a Power-Over-Ethernet (PoE) system, in compliance with the IEEE 802.3af standard. The MAX5953A MAX5953B MAX5953C MAX5953D provide the PD with a detection signature, a classification signature, and an integrated isolation Switch with programmable inrush current control. These devices also integrate a voltage-mode PWM Controller with two Power MOSFETs connected in a two-switch voltage-clamped DC-DC Converter configuration.
An integrated MOSFET provides PD isolation during detection and classification. All devices guarantee a leakage current offset of less than 10A during the detection phase. A programmable current limit prevents high inrush current during power-on. The devices feature power-mode undervoltage lockout (UVLO) with wide hysteresis and long deglitch time to compensate for twisted-pair-cable resistive drop and to assure glitch-free transition between detection, classification, and power-on/-off phases. The MAX5953A MAX5953C have an adjustable UVLO threshold with the default value compliant to the 802.3af standard, while the MAX5953B MAX5953D have a lower and fixed UVLO threshold compatible with some legacy pre-802.3af power-sourcing equipment (PSE) devices.
The DC-DC Converters are operable in either forward or flyback configurations with a wide input voltage range from 11V to 76V and up to 15W of output power. The voltage-clamped power topology enables full recovery of stored magnetizing and leakage inductive energy for enhanced efficiency and reliability. When using the high-side MOSFET the controller CAN be configured as a buck converter. A look-ahead signal for driving secondary-side synchronous Rectifiers CAN be used to increase efficiency. A wide array of protection features include UVLO, over-temperature shutdown, and short-circuit protection with hiccup current limit for enhanced performance and reliability. Operation up to 500kHz allows for smaller external magnetics and capacitors.
The MAX5953A MAX5953B MAX5953C MAX5953D are available in a high-power (2.22W), 7mm x 7mm thermally enhanced thin QFN package.
By Maxim Integrated Products
MAX5953A 's PackagesMAX5953A 's pdf datasheet

MAX5953A Pinout, Pinouts
MAX5953A pinout,Pin out
This is one package pinout of MAX5953A,If you need more pinouts please download MAX5953A's pdf datasheet.

MAX5953A Application circuits
MAX5953A circuits
This is one application circuit of MAX5953A,If you need more circuits,please download MAX5953A's pdf datasheet.

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