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LTC4274IUHF#PBF

Description
Type: Controller (PSE) Power supply voltage: 45V ~ 57V Interface type: I2C Standard: 802.3at (PoE+), 802.3af (PoE)
CategoryAnalog mixed-signal IC    The signal circuit   
File Size343KB,28 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Environmental Compliance
Download Datasheet Parametric View All

LTC4274IUHF#PBF Overview

Type: Controller (PSE) Power supply voltage: 45V ~ 57V Interface type: I2C Standard: 802.3at (PoE+), 802.3af (PoE)

LTC4274IUHF#PBF Parametric

Parameter NameAttribute value
Brand NameLinear Technology
Is it Rohs certified?conform to
MakerLinear ( ADI )
Parts packaging codeQFN
package instructionHVQCCN,
Contacts38
Manufacturer packaging codeUHF
Reach Compliance Codecompliant
Analog Integrated Circuits - Other TypesANALOG CIRCUIT
JESD-30 codeR-PQCC-N38
JESD-609 codee3
length7 mm
Humidity sensitivity level1
Number of functions1
Number of terminals38
Maximum operating temperature85 °C
Minimum operating temperature-40 °C
Package body materialPLASTIC/EPOXY
encapsulated codeHVQCCN
Package shapeRECTANGULAR
Package formCHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
Peak Reflow Temperature (Celsius)260
Certification statusNot Qualified
Maximum seat height0.8 mm
Maximum supply voltage (Vsup)4.3 V
Minimum supply voltage (Vsup)3 V
Nominal supply voltage (Vsup)3.3 V
surface mountYES
technologyCMOS
Temperature levelINDUSTRIAL
Terminal surfaceMatte Tin (Sn)
Terminal formNO LEAD
Terminal pitch0.5 mm
Terminal locationQUAD
Maximum time at peak reflow temperatureNOT SPECIFIED
width5 mm
LTC4274
Single PoE+ PSE Controller
FEATURES
n
n
DESCRIPTION
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 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
n
n
n
n
n
n
n
Compliant with IEEE 802.3at Type 1 and 2
0.34Ω Total Channel Resistance
n
130mW/Port at 600mA
Advanced Power Management
n
8-Bit Programmable Current Limit (I
LIM
)
n
7-Bit Programmable Overload Currents (I
CUT
)
n
Fast Shutdown
n
14.5-Bit Port Current/Voltage Monitoring
n
2-Event Classification
Very High Reliability 4-Point PD Detection
n
2-Point Forced Voltage
n
2-Point Forced Current
High Capacitance Legacy Device Detection
LTC4259A-1 and LTC4266 SW Compatible
1MHz I
2
C Compatible Serial Control Interface
Midspan Backoff Timer
Supports Proprietary Power Levels Above 25W
Available in 38-Pin 5mm × 7mm QFN Package
APPLICATIONS
n
n
PSE Switches/Routers
PSE Midspans
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.
TYPICAL APPLICATION
Complete Ethernet High Power Source
3.3V
10Ω
+
SMAJ5.0A
0.1µF
V
DD
DGND
AGND
AD0 AD1 AD2 AD3
SCL SDAIN SDAOUT
INT
AUTO
MSD
RESET
MID
SHDN
0.22µF
100V
10µF
10Ω
SMAJ58A
TVSBULK
LTC4274
C
BULK
–54V
+
V
EE
1µF
100V
SENSE
GATE OUT
S1B
4274 TA01
PORT
S1B
–54V
4274fe
For more information
www.linear.com/LTC4274
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