LTC4274
1
4274fd
n
PSE Switches/Routers
n
PSE Midspans
APPLICATIONS
FEATURES
DESCRIPTION
Single PoE
+
PSE Controller
The LTC
?/DIV>
4274 is a single power sourcing equipment con-
troller designed for use in IEEE 802.3 Type 1 and Type 2
(high power) compliant Power over Ethernet systems.
External power MOSFETs enhance system reliability and
minimize channel resistance, cutting power dissipation and
eliminating the need for heatsinks even at Type 2 power
levels. External power components also allow use at very
high power levels while remaining otherwise compatible
with the IEEE standard. 80V-rated port pins provide robust
protection against external faults.
The LTC4274 includes advanced power management
features, including current and voltage readback and pro-
grammable I
CUT
and I
LIM
thresholds. Available C libraries
simplify software development; an optional AUTO pin mode
provides fully IEEE-compliant standalone operation with
no software required. Proprietary 4-point PD detection
circuitry minimizes false PD detection while supporting
legacy phone operation. Midspan operation is supported
with built-in 2-event classification and backoff timing.
Host communication is via a 1MHz I
2
C serial interface.
The LTC4274 is available in a 5mm ?7mm QFN package
that significantly reduces board space compared with
competing solutions.
n
Compliant with IEEE 802.3at Type 1 and 2
n
0.34?Total Channel Resistance
130mW/Port at 600mA
n
Advanced Power Management
8-Bit Programmable Current Limit (I
LIM
)
7-Bit Programmable Overload Currents (I
CUT
)
Fast Shutdown
14.5-Bit Port Current/Voltage Monitoring
2-Event Classification
n
Very High Reliability 4-Point PD Detection:
2-Point Forced Voltage
2-Point Forced Current
n
High Capacitance Legacy Device Detection
n
LTC4259A-1 and LTC4266 SW Compatible
n
1MHz I
2
C Compatible Serial Control Interface
n
Midspan Backoff Timer
n
Supports Proprietary Power Levels Above 25W
n
Available in 38-Pin 5mm ?7mm QFN Package
TYPICAL APPLICATION
Complete Ethernet High Power Source
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT and LTPoE
++
are trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners.
4274 TA01
SCL
SDAIN
SDAOUT
AD0
AD1
AD2
AD3
AGND
V
EE
SENSE
54V
1糉
100V
SMAJ58A
GATE OUT
PORT
0.22糉
100V
S1B
S1B
54V
DGND
V
DD
INT
SHDN
AUTO
MSD
RESET
MID
0.1糉
3.3V
LTC4274
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