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Linear Technology Electronic Components Datasheet

LTC4290 Datasheet

8-Port PoE/PoE+/LTPoE++ PSE Controller

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FEATURES
nn Eight Independent PSE Channels
nn Compliant with IEEE 802.3at Type 1 and 2
nn Chipset Provides Electrical Isolation
nn Reduced BOM Cost
nn Eliminates up to 6 High Speed Opto-Couplers
nn Eliminates Isolated 3.3V Power Supply
nn Low Power Dissipation
nn 0.25Ω Sense Resistance Per Channel
nn Very High Reliability 4-Point PD Detection
nn 2-Point Forced Voltage
nn 2-Point Forced Current
nn VEE and VPORT Monitoring
nn 1 Second Rolling IPORT Averaging
nn Supports 2-Pair and 4-Pair Output Power
nn 1MHz I2C Compatible Serial Control Interface
nn Available In Three Power Grades
nn A-Grade – LTPoE++™ 38.7W to 90W
nn B-Grade – PoE+ 25.5W
nn C-Grade – PoE 13W
nn Available In a 40-Lead 6mm × 6mm (LTC4290) and
24-Lead 4mm × 4mm (LTC4271) QFN Package
APPLICATIONS
nn PoE PSE Switches/Routers
nn PoE PSE Midspans
LTC4290/LTC4271
8-Port PoE/PoE+/LTPoE++
PSE Controller
DESCRIPTION
The LTC®4290/LTC4271 chipset is an 8-port power sourc-
ing equipment (PSE) controller designed for use in IEEE
802.3at Type 1 and Type 2 (high power) compliant Power
over Ethernet (PoE) systems. Transformer-isolated com-
munication protocol replaces expensive opto-couplers
and complex isolated 3.3V supply resulting in significant
BOM cost savings. The LTC4290/LTC4271 chipset delivers
lowest-in-industry heat dissipation by utilizing low-RDS(ON)
external MOSFETs and 0.25Ω sense resistors.
Advanced power management features include per-port
12‑bit current monitoring ADCs, DAC-programmable cur-
rent limit, and versatile fast shut-down of preselected ports.
Advanced power management host software is available
under a no-cost license. PD discovery uses a proprietary
dual-mode 4-point detection mechanism ensuring excel-
lent immunity from false PD detection. Midspan PSEs
are supported with 2-event classification and a 2 second
backoff timer. The LTC4290/LTC4271 includes an I2C
serial interface operable up to 1MHz.
The LTC4290/LTC4271 is available in multiple power
grades allowing delivered PD power up to 90W.
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
and LTPoE++ is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
TYPICAL APPLICATION
3.3V 0.1µF
NO ISOLATION
REQUIRED ON
I2C INTERFACE
GP0
GP1
MID
RESET
MSD
AUTO
INT
VDD33
SCL LTC4271
SDAIN
SDAOUT
CPD
3.3V
CND
DPD
AD0
AD1
AD2
AD3
AD6 DGND
3.3V
DND
CAP1
XIO0 XIO1
CPA
100Ω • • 100Ω
–54V
OUTn
GATEn
100Ω
100Ω
CNA
DPA
100Ω • • 100Ω
–54V
SENSEn
LTC4290
OUT1
100Ω
100Ω
10Ω
DNA
AGND CAP2
GATE1
SENSE1
VEE VSSK
0.22µF
100V
0.25Ω
0.22µF
100V
0.25Ω
1µF
2nF 2kV
0.1µF
1µF
–54V
>47µF +
SYSTEM
BULK CAP
–54V
S1B
PORTn
S1B
–54V
S1B
PORT1
S1B
–54V
429071 TA01a
LTC4290/LTC4271 FAMILY
MAX
LTC4290
DELIVERED
GRADE ISOLATION LTPoE++ PoE+ PoE POWER
A Transformer l
l l 90W
B Transformer
l l 25.5W
C Transformer
l 13W
429071fb
For more information www.linear.com/LTC4290
1


Linear Technology Electronic Components Datasheet

LTC4290 Datasheet

8-Port PoE/PoE+/LTPoE++ PSE Controller

No Preview Available !

LTC4290/LTC4271
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 4)
LTC4290
Supply Voltages
AGND – VEE............................................ –0.3V to 80V
VSSK (Note 7)...................... VEE – 0.3V to VEE + 0.3V
Digital Pins
XIOn .................................. VEE – 0.3V to CAP2 + 0.3V
Analog Pins
SENSEn, GATEn, OUTn ......... VEE – 0.3V to VEE + 80V
CAP2 (Note 13) ........................ VEE –0.3V to VEE + 5V
CPA, CNA, DPA, DNA...............VEE – 0.3V to VEE + 0.3
Operating Ambient Temperature Range
LTC4290I..............................................–40°C to 85°C
Junction Temperature (Note 2)............................. 125°C
Storage Temperature Range................... –65°C to 150°C
(Note 1)
LTC4271
Supply Voltages
VDD – DGND.......................................... –0.3V to 3.6V
Digital Pins
SCL, SDAIN, SDAOUT, INT, RESET, MSD, ADn, AUTO,
MID, GPn .........................DGND – 0.3V to VDD + 0.3V
Analog Pins
CAP1 (Note 13)............................–0.3V to DGND + 2V
CPD, CND, DPD, DND.......DGND – 0.3V to VDD + 0.3V
Operating Ambient Temperature Range
LTC4271I..............................................–40°C to 85°C
Junction Temperature (Note 2)............................. 125°C
Storage Temperature Range................... –65°C to 150°C
2
For more information www.linear.com/LTC4290
429071fb


Part Number LTC4290
Description 8-Port PoE/PoE+/LTPoE++ PSE Controller
Maker Linear Technology
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LTC4290 Datasheet PDF






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