LTC4263
1
4263fe
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
Single IEEE 802.3af
Compliant PSE Controller
with Internal Switch
The LTC
?/DIV>
4263 is an autonomous single-channel PSE
controller for use in IEEE 802.3af compliant Power over
Ethernet systems. It includes an onboard power MOSFET,
internal inrush, current limit, and short-circuit control,
IEEE 802.3af compliant PD detection and classi cation
circuitry, and selectable AC or DC disconnect sensing.
Onboard control algorithms provide complete IEEE 802.3af
compliant operation without the need of a microcontroller.
The LTC4263 simpli es PSE implementation, needing
only a single 48V supply and a small number of passive
support components.
Programmable onboard power management circuitry
permits multiple LTC4263s to allocate and share power
in multi-port systems, allowing maximum utilization of
the 48V power supplyall without the intervention of a
host processor. The port current limit can be con gured
to automatically adjust to the detected PD class. Detec-
tion backoff timing is con gurable for either Endpoint or
Midspan operation. Built-in foldback and thermal protection
provide comprehensive fault protection.
An LED pin indicates the state of the port controlled by
the LTC4263. When run from a single 48V supply, the LED
pin can operate as a simple switching current source to
reduce power dissipation in the LED drive circuitry.
The LTC4263 is available in 14-pin 4mm ?3mm DFN and
14-pin SO packages.
n
IEEE 802
?/DIV>
.3af Compliant
n
Operation from a Single 48V Supply
n
Fully Autonomous Operation without
Microcontroller
n
Internal MOSFET with Thermal Protection
n
Power Management Works Across Multiple Ports
with Simple RC Network
n
Precision Inrush Control with Internal Sense Resistor
n
Powered Device (PD) Detection and Classi cation
n
AC and DC Disconnect Sensing
n
Robust Short-Circuit Protection
n
Pin-Selectable Detection Backoff for Midspan PSEs
n
Classi cation Dependent I
CUT
Current Threshold
n
LED Driver Indicates Port On and Blinks
Status Codes
n
Available in 14-Pin SO and 4mm ?3mm DFN Packages
n
IEEE 802.3af Compliant Endpoint/Midspan PSEs
n
Single-Port or Multi-Port Power Injectors
n
Power Forwarders
n
Low-Port Count PSEs
n
Environment B PSEs
n
Standalone PSEs
Single-Port Fully Autonomous PSE
4263 TA01
0.1糉
100V
0.1糉
0.1糉
100V
SMAJ58A
LED
LEGACY
MIDSPAN
PWRMGT
V
SS
V
SS
OSC
LTC4263
ISOLATED
48V SUPPLY
+
TO PORT
MAGNETICS
V
DD5
ENFCLS
SD
V
DD48
OUT
OUT
ACOUT
1A
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
Corporation. All other trademarks are the property of their respective owners.
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