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LTC4270BIUKG#PBF

Description
Power Over Ethernet PSE Controller 3V 3.6V 25.5W 52-Pin QFN EP
File Size371KB,32 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Parametric Compare View All

LTC4270BIUKG#PBF Overview

Power Over Ethernet PSE Controller 3V 3.6V 25.5W 52-Pin QFN EP

LTC4270BIUKG#PBF Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesCompliant
ECCN (US)EAR99
Part StatusActive
TypePSE Controller
Standard SupportedIEEE802.3at
Minimum Input Voltage (V)3
Maximum Input Voltage (V)3.6
Maximum Output Power (W)25.5
ProgrammabilityYes
Minimum Operating Temperature (°C)-40
Maximum Operating Temperature (°C)85
PackagingTube
Pin Count52
Standard Package NameQFN
Supplier PackageQFN EP
MountingSurface Mount
Package Height0.75(Max)
Package Length8
Package Width7
PCB changed52
Lead ShapeNo Lead
LTC4270/LTC4271
12-Port PoE/PoE+/LTPoE++
PSE Controller
FEATURES
n
n
n
DESCRIPTION
The
LTC
®
4270/LTC4271
chipset is a 12-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 LTC4270/LTC4271 chipset delivers
lowest-in-industry heat dissipation by utilizing low-R
DS(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 LTC4270/LTC4271 includes an I
2
C
serial interface operable up to 1MHz.
The LTC4270/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.
n
n
n
n
n
n
n
n
12 Independent PSE Channels
Compliant with IEEE 802.3at Type 1 and 2
Chipset Provides Electrical Isolation
n
Reduced BOM Cost
n
Eliminates up to 6 High Speed Opto-Couplers
n
Eliminates Isolated 3.3V Power Supply
Low Power Dissipation
n
0.25Ω Sense Resistance Per Channel
Very High Reliability 4-Point PD Detection
n
2-Point Forced Voltage
n
2-Point Forced Current
V
EE
and V
PORT
Monitoring
1 Second Rolling I
PORT
Averaging
Supports 2-Pair and 4-Pair Output Power
1MHz I
2
C Compatible Serial Control Interface
Available In Three Power Grades
n
A-Grade – LTPoE++
38.7W to 90W
n
B-Grade – PoE+ 25.5W
n
C-Grade – PoE 13W
Available In 52-Lead 7mm
×
8mm (LTC4270) and
24-Lead 4mm
×
4mm (LTC4271) QFN Packages
PoE PSE Switches/Routers
PoE PSE Midspans
APPLICATIONS
n
n
TYPICAL APPLICATION
3.3V
0.1µF
GP0
GP1
MID
RESET
MSD
AUTO
INT
SCL
SDAIN
SDAOUT
LTC4271
V
DD33
CPD
100
3.3V
100
CND
DPD
100
3.3V
100
DND
CAP1
1µF
2nF 2kV
1µF
–54V
10
CPA
XIO0
XIO1
OUTn
GATEn
SENSEn
LTC4270
0.25
0.22µF
100V
S1B
PORTn
S1B
–54V
LTC4270/LTC4271 FAMILY
MAX
LTC4270
DELIVERED
++ PoE+ PoE POWER
GRADE ISOLATION LTPoE
A
B
C
Transformer
Transformer
Transformer
l
l
l
l
l
l
NO ISOLATION
REQUIRED ON
I
2
C INTERFACE
100
–54V
100
CNA
DPA
90W
25.5W
13W
100
–54V
100
DNA
0.22µF
100V
OUT1
GATE1
S1B
PORT1
S1B
–54V
AD0
AD1
AD2
AD3
AD6 DGND
SENSE1
AGND CAP2 V
EE
VSSK
0.1µF
0.25
>47µF
SYSTEM
BULK CAP
+
–54V
42701 TA01a
42701fd
For more information
www.linear.com/LTC4270
1

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Description Power Over Ethernet PSE Controller 3V 3.6V 25.5W 52-Pin QFN EP Power Over Ethernet PSE Controller 3V 3.6V 90W 52-Pin QFN EP Power Over Ethernet PSE Controller 3V 3.6V 90W 52-Pin QFN EP Power Over Ethernet PSE Controller 3V 3.6V 25.5W 52-Pin QFN EP Power Over Ethernet PSE Controller 3V 3.6V 13W 52-Pin QFN EP Power Over Ethernet PSE Controller 3V 3.6V 13W 52-Pin QFN EP
EU restricts the use of certain hazardous substances Compliant Compliant Compliant Compliant Compliant Compliant
ECCN (US) EAR99 EAR99 EAR99 EAR99 EAR99 EAR99
Part Status Active Active Active Active Active Active
Type PSE Controller PSE Controller PSE Controller PSE Controller PSE Controller PSE Controller
Standard Supported IEEE802.3at IEEE802.3at IEEE802.3at IEEE802.3at IEEE802.3at IEEE802.3at
Minimum Input Voltage (V) 3 3 3 3 3 3
Maximum Input Voltage (V) 3.6 3.6 3.6 3.6 3.6 3.6
Maximum Output Power (W) 25.5 90 90 25.5 13 13
Programmability Yes Yes Yes Yes Yes Yes
Minimum Operating Temperature (°C) -40 -40 -40 -40 -40 -40
Maximum Operating Temperature (°C) 85 85 85 85 85 85
Packaging Tube Tube Tape and Reel Tape and Reel Tube Tape and Reel
Pin Count 52 52 52 52 52 52
Standard Package Name QFN QFN QFN QFN QFN QFN
Supplier Package QFN EP QFN EP QFN EP QFN EP QFN EP QFN EP
Mounting Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount
Package Height 0.75(Max) 0.75(Max) 0.75(Max) 0.75(Max) 0.75(Max) 0.75(Max)
Package Length 8 8 8 8 8 8
Package Width 7 7 7 7 7 7
PCB changed 52 52 52 52 52 52
Lead Shape No Lead No Lead No Lead No Lead No Lead No Lead
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