Product Summary

The LTC4259A-1 is a quad –48V Hot SwapTM controllerdesigned for use in IEEE 802.3af compliant Power Sourc-ing Equipment (PSE). It consists of four independent ports,each with output current limit, short-circuit protection, com-plete Powered Device (PD) detection and classification ca-pability, and programmable PD disconnect using AC or DCsensing. Used with power MOSFETs and passives as inFigure 1, the LTC4259A-1 can implement a complete IEEE802.3af-compliant PSE.

Parametrics

ABSOLUTE MAXIUM RATIGS:(1)Supply Voltages:VDD to DGND:– 0.3V to 5V;VEE to AGND:0.3V to – 70V;DGND to AGND (Note 2):±1V; (2)Digital PinsSCL, SDAIN, SDAOUT, INT, AUTO, RESETSHDNn, ADn:DGND – 0.3V to DGND + 5V; (3)Analog Pins:GATEn (Note 3):VEE – 0.3V to VEE + 12V;DETECTn Peak Currents (Note 4:±80mA;SENSEn:VEE – 0.3V to VEE + 1V;OUTn:VEE – 70V to VEE + 70V;OSCIN:DGND – 0.3V to DGND + 5V;BYP Current:±1mA; (4)Operating Ambient Temperature RangeLTC4259AC-1:0℃to 70℃;LTC4259AI-1:–40℃ – 85℃; (5)Junction Temperature (Note 5):150℃; (6)Storage Temperature Range:– 65℃ to 150℃; (7)Lead Temperature (Soldering, 10 sec):300℃

Features

(1)Controls Four Independent – 48V PoweredEthernet Ports; (2)Each LTC4259A-1 Port Includes:IEEE 802.3af Compliant PD Detection andClassification;Output Current Limit with Foldback; Short-Circuit Protection with Fast Gate Pull-Down;PD Disconnect Using AC or DC Sensing;Improved AC Disconnect; Improved UVLO; (3)Operates Autonomously or Controlled by I2CTMSerial Interface; (4)4-Bit Programmable Digital Address Allows Controlof Up to 64 Ports; (5)Current and Duty Cycle Limits Protect External FETs; (6)IMPROVED UVLO; (7)Available in a 36-pin SSOP package

Diagrams

<IMG border=0 src="http://www.seekic.com/uploadfile/ic-mfg/20127243612559.jpg">

Image Part No Mfg Description Data Sheet Download Pricing
(USD)		 Quantity
LTC4259ACGW-1#PBF
LTC4259ACGW-1#PBF

IC CTRLR POE QUAD AC DISC 36SSOP
Data Sheet
0-96: $5.71
LTC4259ACGW-1#TRPBF
LTC4259ACGW-1#TRPBF

IC CTRLR POE QUAD AC DISC 36SSOP
Data Sheet
0-1000: $4.92