LTC4263-1_15 Datasheet, PDF (1/20 Pages) Linear Technology – High Power Single PSE Controller with Internal Switch

LTC4263-1
High Power
Single PSE Controller
with Internal Switch
FEATURES
n _{30W PSE Output Power}
n _{IEEE 802}^®_{.3af Compatible}
n _{Operation from a Single 56V Supply}
n _{Fully Autonomous Operation Without a}
Microcontroller
n _{Internal MOSFET with Thermal Protection}
n _{Precision Inrush Control with Internal Sense Resistor}
n _{Forced Current PD Detection for Noise Immunity}
n _{AC and DC Disconnect Sensing}
n _{Legacy PD Detection}
n _{Robust Short-Circuit Protection}
n _{Pin-Selectable Detection Backoff for Midspan PSEs}
n _{LED Driver Indicates Port On and Blinks}
Status Codes
n _{Available in a Miniature14-Pin 4mm × 3mm DFN}
Package
APPLICATIONS
n _{High Power Endpoint/Midspan PSEs}
n _{Single-Port or Multi-Port Power Injectors}
n _{Low Port Count PSEs}
n _{Environment B PSEs}
n _{Standalone PSEs}
DESCRIPTION
The LTC^®4263-1 is a high power, single PSE controller for
use in Power over Ethernet systems. The internal current
limit and short-circuit protection are designed to provide
up to 30W of PSE output power for power hungry PoE
applications such as WAPs, security cameras and RFID
readers.
The LTC4263-1 includes IEEE 802.3af compliant PD detec-
tion circuitry along with selectable AC and DC disconnect
sensing, allowing seamless operation in conventional
IEEE 802.3af systems as well as propriety, high power
applications. The LTC4263-1 simplifies PSE implementa-
tion, needing only a single supply and a small number of
passive support components. Onboard control algorithms
provide complete PSE functionality without the need of a
microcontroller and built-in foldback and thermal shutdown
provide comprehensive fault protection. An LED pin indi-
cates the state of the port and detection backoff timing is
configurable for either endpoint or midspan operation.
The LTC4263-1 is available in a miniature 14-pin 4mm ×
3mm DFN package.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
Single-Port Fully Autonomous High Power PSE
+
ISOLATED
56V SUPPLY
0.1μF
100V
0.1μF
–
LTC4263-1
LED
V_DD5
LEGACY
V_SS
MIDSPAN
SD
V_SS
V_DD48
V_SS
OUT
V_SS
OUT
OSC
ACOUT
1A
SMAJ58A
0.1μF
100V
TO PORT
MAGNETICS
42631 TA01
42631fa
1