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LTC4279 Datasheet

Single Port PoE/PoE+/LTPoE++ PSE Controller

No Preview Available !

LTC4279
Single Port PoE/PoE+/
LTPoE++ PSE Controller
FEATURES
nn Compliant with IEEE 802.3at Type 1 and 2
nn Supports LTPoE++® Up to 90W
nn Supports Dual-Signature PDs
nn Fully Autonomous Operation without Microcontroller
nn Very Low Power Dissipation
– 0.1Ω Sense Resistance
– Low RDS(ON) External MOSFET
nn Very High Reliability 4-Point PD Detection
– 2-Point Forced Voltage and Forced Current
nn Robust Short-Circuit Protection
nn Cable Surge Protected ±80V OUT Pin
nn Classification Dependent ICUT and ILIM Current
Thresholds
nn Supports 2-Pair and 4-Pair Output Power
nn UltraPWR Mode Supports Custom PDs Up to 123W
nn Pin-Selectable Detection Backoff Timer for Midspans
nn Pin Programmable Legacy PD Detection
nn Pin Programmable Maximum Power Mode
nn Status LED Pin
nn Available in 20-Pin QFN and 16-Pin SO Packages
APPLICATIONS
nn PoE PSE Endpoints (Switch/Router)
nn PoE Midspan Power Injectors
nn Power Forwarders
nn Femto Cells
nn Security Systems
DESCRIPTION
The LTC®4279 is an autonomous single port power sourc-
ing equipment (PSE) controller designed for use in IEEE
802.3at Type 1, Type 2 and LTPoE++ compliant Power
over Ethernet (PoE) systems. The LTC4279 provides fully
autonomous IEEE 802.3 and LTPoE++ compliant operation
without a microcontroller. The LTC4279 simplifies PSE
implementation, requiring only a single supply and a small
number of passive support components.
The LTC4279 delivers lowest-in-industry heat dissipation
by utilizing a low-RDS(ON) external MOSFET and a 0.1Ω
sense resistor, eliminating the need for expensive heat
sinks and increasing efficiency.
PD discovery uses a proprietary dual-mode 4-point detec-
tion mechanism ensuring excellent immunity from false
PD detection. Midspan PSEs are supported with physical
layer classification and a 2.5 second backoff timer.
Legacy and custom PDs are supported with pin-selectable
LEGACY and UltraPWR modes. LEGACY mode detects
and powers pre-IEEE specification PDs. UltraPWR mode
aggressively turns on and powers custom PDs requiring
high inrush and/or operational currents.
L, LT, LTC, LTM, Linear Technology, the Linear logo and LTPoE++ are registered trademarks of
Analog Devices, Inc. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
CBULK
VEE
10Ω
TVSBULK
1µF
100V
X7R
SMAJ58A RPM
LED
RESET
AGND
LTC4279
PWRMODE
MID
LEGACY
DUALPD
VEE
OUT
GATE
SENSE
VSSK
RGATE
0.22µF
100V S1B
X7R
0.1Ω
4279 TA01
MAXIMUM PD INPUT POWER
+ Type 1 (13W)
PORT
Type 2 (25.5W)
LTPoE++ 38.7W
LTPoE++ 52.7W
LTPoE++ 70W
LTPoE++ 90W
UltraPWR – (Up to 123W*)
*Depending on VPSE
For more information www.linear.com/LTC4279
RPM (±1%)
2.37k
3.32k
4.64k
5.90k
7.87k
10.0k
13.0k
4279fa
1


Analog Devices Semiconductor Electronic Components Datasheet

LTC4279 Datasheet

Single Port PoE/PoE+/LTPoE++ PSE Controller

No Preview Available !

LTC4279
ABSOLUTE MAXIMUM RATINGS (Notes 1 and 4)
Supply Voltages
AGND – VEE............................................ –0.3V to 80V
VSSK.................................... VEE – 0.3V to VEE + 0.3V
LEGACY, MID, DUALPD, LED,
RESET, GATE, PWRMODE.......... VEE – 0.3V to VEE + 80V
OUT............................................. VEE – 80V to VEE + 80V
SENSE......................................... VEE – 20V to VEE + 80V
Operating Ambient Temperature Range
LTC4279I..............................................–40°C to 85°C
Junction Temperature (Note 2)............................. 125°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................... 300°C
PIN CONFIGURATION
TOP VIEW
MID 1
DNC 2
DNC 3
VSSK 4
SENSE 5
GATE 6
OUT 7
AGND 8
16 RESET
15 DNC
14 DUALPD
13 LEGACY
12 PWRMODE
11 DNC
10 VEE
9 LED
S PACKAGE
16-LEAD PLASTIC SO
TJMAX = 125°C, θJA = 80°C/W, θJC = 30°C/W
TOP VIEW
DNC 1
DNC 2
DNC 3
VEE 4
VSSK 5
SENSE 6
20 19 18 17
16 DUALPD
15 LEGACY
21 14 DNC
VEE 13 PWRMODE
12 DNC
11 DNC
7 8 9 10
UFD PACKAGE
20-LEAD (4mm × 5mm) PLASTIC QFN
TJMAX = 125°C, θJA = 43°C/W, θJC = 3.4°C/W
EXPOSED PAD (PIN 21) IS VEE
ORDER INFORMATION http://www.linear.com/product/LTC4279#orderinfo
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC4279IUFD#PBF
LTC4279IUFD#TRPBF 4279
20-Lead (4mm × 5mm) Plastic QFN
–40°C to 85°C
LTC4279IS#PBF
LTC4279IS#TRPBF
LTC4279S
16-Lead Plastic SO
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
4279fa
2 For more information www.linear.com/LTC4279


Part Number LTC4279
Description Single Port PoE/PoE+/LTPoE++ PSE Controller
Maker Analog Devices
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LTC4279 Datasheet PDF






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