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Linear Technology Electronic Components Datasheet

LTC4266 Datasheet

Quad IEEE 802.3at Power over Ethernet Controller

No Preview Available !

FEATURES
nn Four Independent PSE Channels
nn Compliant with IEEE 802.3at Type 1 and 2
nn 0.34Ω Total Channel Resistance
nn 130mW/Port at 600mA
nn Advanced Power Management
nn 8-Bit Programmable Current Limit (ILIM)
nn 7-Bit Programmable Overload Currents (ICUT)
nn Fast Shutdown of Preselected Ports
nn 14.5-Bit Port Current/Voltage Monitoring
nn 2-Event Classification
nn Very High Reliability 4-Point PD Detection
nn 2-Point Forced Voltage
nn 2-Point Forced Current
nn High Capacitance Legacy Device Detection
nn LTC4259A-1 and LTC4258 Pin and SW Compatible
nn 1MHz I2C Compatible Serial Control Interface
nn Midspan Backoff Timer
nn Supports Proprietary Power Levels Above 25W
nn Available in 38-Pin 5mm × 7mm QFN and 36-Pin
SSOP Packages
APPLICATIONS
nn High Power PSE Switches/Routers
nn High Power PSE Midspans
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.
LTC4266
Quad IEEE 802.3at Power
over Ethernet Controller
DESCRIPTION
The LTC®4266 is a quad PSE controller 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 LTC4266 includes advanced power management
features, including current and voltage readback and pro-
grammable ICUT and ILIM thresholds. Available C libraries
simplify power-management 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 detec-
tion 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 LTC4266 is available in a 5mm × 7mm QFN package
that significantly reduces board space compared with
competing solutions. A legacy-compatible 36-pin SSOP
package is also available.
TYPICAL APPLICATION
Complete 4-Port Ethernet High Power Source
3.3V 10Ω
+ SMAJ5.0A
10µF
10Ω
+
CBULK
–54V
SMAJ58A
TVSBULK
VDD
0.1µF
AD0 AD1 AD2 AD3
DGND
SHDN1
SHDN2
SHDN3 SHDN4
LTC4266
AUTO MSD
RESET
MID SDAIN SCL
SDAOUT
INT
AGND
1µF
100V
VEE SENSE1 GATE1 OUT1 SENSE2 GATE2 OUT2 SENSE3 GATE3 OUT3 SENSE4 GATE4 OUT4
0.22µF 100V
×4
S1B
×4
S1B
×4
–54V
PORT1
PORT2
PORT3
PORT4
4266 TA01
For more information www.linear.com/LTC4266
4266ff
1


Linear Technology Electronic Components Datasheet

LTC4266 Datasheet

Quad IEEE 802.3at Power over Ethernet Controller

No Preview Available !

LTC4266
ABSOLUTE MAXIMUM RATINGS
Supply Voltages (Note 1)
AGND – VEE............................................ –0.3V to 80V
DGND – VEE............................................ –0.3V to 80V
VDD – DGND.......................................... –0.3V to 5.5V
Digital Pins
SCL, SDAIN, SDAOUT, INT, SHDNn, MSD, ADn,
RESET, AUTO, MID............ DGND –0.3V to VDD + 0.3V
Analog Pins
GATEn, SENSEn, OUTn........... VEE –0.3V to VEE + 80V
Operating Temperature Range
LTC4266C................................................. 0°C to 70°C
LTC4266I..............................................–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
RESET 1
MID 2
INT 3
SCL 4
SDAOUT 5
SDAIN 6
AD3 7
AD2 8
AD1 9
AD0 10
NC 11
NC 12
NC 13
NC 14
DGND 15
VDD 16
SHDN1 17
SHDN2 18
TOP VIEW
36 MSD
35 AUTO
34 OUT1
33 GATE1
32 SENSE1
31 OUT2
30 GATE2
29 SENSE2
28 VEE
27 OUT3
26 GATE3
25 SENSE3
24 OUT4
23 GATE4
22 SENSE4
21 AGND
20 SHDN4
19 SHDN3
GW36 PACKAGE
36-LEAD PLASTIC WIDE SSOP
TJMAX = 125°C, θJA = 80°C/W
TOP VIEW
SDAOUT 1
NC 2
SDAIN 3
AD3 4
AD2 5
AD1 6
AD0 7
DNC 8
NC 9
DGND 10
NC 11
NC 12
38 37 36 35 34 33 32
39
13 14 15 16 17 18 19
31 GATE1
30 SENSE1
29 OUT2
28 GATE2
27 SENSE2
26 VEE
25 VEE
24 OUT3
23 GATE3
22 SENSE3
21 OUT4
20 GATE4
UHF PACKAGE
38-LEAD (5mm × 7mm) PLASTIC QFN
EXPOSED PAD IS VEE (PIN 39) MUST BE SOLDERED TO PCB
TJMAX = 125°C, θJA = 34°C/W
ORDER INFORMATION
LEAD FREE FINISH
LTC4266CGW#PBF
LTC4266IGW#PBF
LTC4266CUHF#PBF
LTC4266IUHF#PBF
TAPE AND REEL
LTC4266CGW#TRPBF
LTC4266IGW#TRPBF
LTC4266CUHF#TRPBF
LTC4266IUHF#TRPBF
PART MARKING*
LTC4266CGW
LTC4266IGW
4266
4266
PACKAGE DESCRIPTION
36-Lead Plastic Wide SSOP
36-Lead Plastic Wide SSOP
38-Lead (5mm × 7mm) Plastic QFN
38-Lead (5mm × 7mm) Plastic QFN
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
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/
4266ff
2 For more information www.linear.com/LTC4266


Part Number LTC4266
Description Quad IEEE 802.3at Power over Ethernet Controller
Maker Linear Technology
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LTC4266 Datasheet PDF





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