LTC4263 Single IEEE 802.3af Compliant PSE Controller with Internal Switch FEATURES DESCRIPTION n IEEE 802 .3af Compliant The LTC 4263 is an autonomous single-channel PSE n Operation from a Single 48V Supply controller for use in IEEE 802.3af compliant Power over n Fully Autonomous Operation without Ethernet systems. It includes an onboard power MOSFET, Microcontroller internal inrush, current limit, and short-circuit control, n Internal MOSFET with Thermal Protection IEEE 802.3af compliant PD detection and classi cation n Power Management Works Across Multiple Ports circuitry, and selectable AC or DC disconnect sensing. with Simple RC Network Onboard control algorithms provide complete IEEE 802.3af n Precision Inrush Control with Internal Sense Resistor compliant operation without the need of a microcontroller. n Powered Device (PD) Detection and Classi cation The LTC4263 simpli es PSE implementation, needing n AC and DC Disconnect Sensing only a single 48V supply and a small number of passive n Robust Short-Circuit Protection support components. n Pin-Selectable Detection Backoff for Midspan PSEs Programmable onboard power management circuitry n Classi cation Dependent I Current Threshold CUT permits multiple LTC4263s to allocate and share power n LED Driver Indicates Port On and Blinks in multi-port systems, allowing maximum utilization of Status Codes the 48V power supplyall without the intervention of a n Available in 14-Pin SO and 4mm 3mm DFN Packages host processor. The port current limit can be con gured to automatically adjust to the detected PD class. Detec- APPLICATIONS tion backoff timing is con gurable for either Endpoint or n IEEE 802.3af Compliant Endpoint/Midspan PSEs Midspan operation. Built-in foldback and thermal protection n Single-Port or Multi-Port Power Injectors provide comprehensive fault protection. n Power Forwarders An LED pin indicates the state of the port controlled by n Low-Port Count PSEs the LTC4263. When run from a single 48V supply, the LED n Environment B PSEs pin can operate as a simple switching current source to n Standalone PSEs reduce power dissipation in the LED drive circuitry. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. Hot Swap and ThinSOT are trademarks of Linear Technology The LTC4263 is available in 14-pin 4mm 3mm DFN and Corporation. All other trademarks are the property of their respective owners. 14-pin SO packages. TYPICAL APPLICATION Single-Port Fully Autonomous PSE 1A + 0.1F 0.1F LTC4263 100V 100V LED V DD5 ISOLATED TO PORT 0.1F SMAJ58A LEGACY ENFCLS 48V SUPPLY MAGNETICS MIDSPAN SD V DD48 PWRMGT OUT V SS OUT V SS ACOUT OSC 4263 TA01 4263fe 1LTC4263 ABSOLUTE MAXIMUM RATINGS (Notes 1, 2) Supply Voltages Operating Ambient Temperature Range V V ........................................... 0.3V to 80V LTC4263C ................................................ 0C to 70C SS DD48 V ........................................ V 0.3V to V + 6V LTC4263I .............................................40C to 85C DD5 SS SS Pin Voltages and Currents Junction Temperature (Note 4) ............................. 125C LEGACY, MIDSPAN, ENFCLS, PWRMGT Storage Temperature Range ...................65C to 150C SD, OSC .................................. V 0.3V to V + 6V Lead Temperature (Soldering, 10 sec) SS SS LED .......................................V 0.3V to V + 80V SO .....................................................................300C SS SS OUT, ACOUT ............................................ (See Note 3) PIN CONFIGURATION TOP VIEW TOP VIEW LED 1 14 V LED 1 14 V DD5 DD5 LEGACY 2 13 ENFCLS LEGACY 2 13 ENFCLS MIDSPAN 3 12 SD MIDSPAN 3 12 SD 15 PWRMGT 4 11 V DD48 PWRMGT 4 11 V DD48 V 5 10 OUT SS V 5 10 OUT SS V 6 9 OUT SS V 6 9 OUT SS OSC 7 8 ACOUT OSC 7 8 ACOUT DE14 PACKAGE S PACKAGE 14-LEAD (4mm 3mm) PLASTIC DFNs 14-LEAD PLASTIC SO T = 125C, = 43C/W, = 4.3C/W JMAX JA JC T = 125C, = 90C/W, = 37C/W EXPOSED PAD (PIN 15) IS V , MUST BE SOLDERED TO PCB JMAX JA JC SS ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC4263CDE PBF LTC4263CDE TRPBF 4263 0C to 70C 14-Lead (4mm 3mm) Plastic DFN LTC4263IDE PBF LTC4263IDE TRPBF 4263 40C to 85C 14-Lead (4mm 3mm) Plastic DFN LTC4263CS PBF LTC4263CS TRPBF 4263CS 14-Lead Plastic SO 0C to 70C LTC4263IS PBF LTC4263IS TRPBF 4263IS 14-Lead Plastic SO 40C to 85C Consult LTC Marketing for parts speci ed with wider operating temperature ranges. *The temperature grade is identi ed by a label on the shipping container. For more information on lead free part marking, go to: