Hot-selling and scarce LTC4266CUHF-TRPBF 12-Port PoE/PoE+/LTPoE++ PSE Controller IC QFN spot stock

Product Descriptions

The LTC®4270/LTC4271 chipset is a 12-port power sourcing equipment (PSE) controller designed for use in IEEE  802.3at Type 1 and Type 2 (high power) compliant Power  over Ethernet (PoE) systems. Transformer-isolated communication protocol replaces expensive opto-couplers  and complex isolated 3.3V supply resulting in significant  BOMcost savings. TheLTC4270/LTC4271chipsetdelivers lowest-in-industryheatdissipationbyutilizinglow-RDS(ON) external MOSFETs and 0.25Ω sense resistors.

Advancedpowermanagementfeaturesincludeper-port 12- bit current monitoring ADCs, DAC-programmable current  limit, and versatile fast shut-down of preselected ports.  Advanced power management host software is available  under a no-cost license. PD discovery uses a proprietary  dual-mode 4-point detection mechanism ensuring excellent immunity from false PD detection. Midspan PSEs  are supported with 2-event classification and a 2 second  backoff timer. The LTC4270/LTC4271 includes an I2C  serial interface operable up to 1MHz.

The LTC4270/LTC4271 is available in multiple power  grades allowing delivered PD power up to 90W.

Product Features

n 12 Independent PSE Channels

n Compliant with IEEE 802.3at Type 1 and 2

n Chipset Provides Electrical Isolation

Reduced BOM Cost

Eliminates up to 6 High Speed Opto-Couplers

Eliminates Isolated 3.3V Power Supply

n Low Power Dissipation

0.25Ω Sense Resistance Per Channel

n Very High Reliability 4-Point PD Detection

2-Point Forced Voltage

2-Point Forced Current

n VEE and VPORT Monitoring

n 1 Second Rolling IPORT Averaging

n Supports 2-Pair and 4-Pair Output Power

n 1MHz I2C Compatible Serial Control Interface

n Available In Three Power Grades

A-Grade – LTPoE++™ 38.7W to 90W

B-Grade – PoE+ 25.5W

C-Grade – PoE 13W

n Available In 52-Lead 7mm × 8mm (LTC4270)

and 24-Lead 4mm × 4mm (LTC4271) QFN Packages

Product Applications

n PoE PSE Switches/Routers

n PoE PSE Midspans

Product Specification

Product Photos

For more product information, please download the PDF