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LT1619 Datasheet(PDF) 1 Page - Linear Technology

Part # LT1619
Description  Single PoE PSE Controller High Capacitance Legacy Device Detection
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1619 Datasheet(HTML) 1 Page - Linear Technology

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LTC4274
1
4274fa
n PSE Switches/Routers
n PSE Midspans
APPLICATIONS
FEATURES
DESCRIPTION
Single PoE+ PSE Controller
The LTC®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 ICUT and ILIM 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 I2C 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 0.34Ω Total Channel Resistance
130mW/Port at 600mA
n Advanced Power Management
8-Bit Programmable Current Limit (ILIM)
7-Bit Programmable Overload Currents (ICUT)
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 I2C 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 is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners.
4274 TA01
SCL
SDAIN
SDAOUT
AD0
AD1
AD2
AD3
AGND
VEE SENSE
–54V
1μF
100V
SMAJ58A
GATE
OUT
PORT
0.22μF
100V
S1B
S1B
–54V
DGND
VDD
INT
SHDN
AUTO
MSD
RESET
MID
0.1μF
3.3V
LTC4274


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