900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf




Linear Technology Electronic Components Datasheet

LTC4274 Datasheet

Single PoE+ PSE Controller

No Preview Available !

LTC4274
Single PoE+ PSE Controller
FEATURES
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
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 LTC4266 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 Package
APPLICATIONS
nn PSE Switches/Routers
nn 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.
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 ICUT and ILIM 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 I2C serial interface.
The LTC4274 is available in a 5mm × 7mm QFN package
that significantly reduces board space compared with
competing solutions.
TYPICAL APPLICATION
Complete Ethernet High Power Source
3.3V 10Ω
+ SMAJ5.0A
10µF
10Ω
+
CBULK
–54V
SMAJ58A
TVSBULK
AD0 AD1 AD2 AD3
VDD
0.1µF
SCL SDAIN SDAOUT INT
AUTO
DGND
LTC4274
MSD
RESET
AGND
MID
1µF
100V
VEE SENSE GATE OUT SHDN
0.22µF
100V
S1B
S1B
–54V
PORT
4274 TA01
For more information www.linear.com/LTC4274
4274fe
1


Linear Technology Electronic Components Datasheet

LTC4274 Datasheet

Single PoE+ PSE Controller

No Preview Available !

LTC4274
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, SHDN, MSD, ADn,
RESET, AUTO, MID............ DGND –0.3V to VDD + 0.3V
Analog Pins
GATE, SENSE, OUT................. VEE –0.3V to VEE + 80V
Operating Temperature Range
LTC4274C................................................. 0°C to 70°C
LTC4274I...............................................–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
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
VEE
39
13 14 15 16 17 18 19
31 GATE
30 SENSE
29 NC
28 NC
27 VEE
26 VEE
25 VEE
24 NC
23 NC
22 VEE
21 NC
20 NC
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
LTC4274CUHF#PBF
LTC4274IUHF#PBF
TAPE AND REEL
LTC4274CUHF#TRPBF
LTC4274IUHF#TRPBF
PART MARKING*
4274
4274
PACKAGE DESCRIPTION
38-Lead (5mm × 7mm) Plastic QFN
38-Lead (5mm × 7mm) Plastic QFN
TEMPERATURE RANGE
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/
4274fe
2 For more information www.linear.com/LTC4274


Part Number LTC4274
Description Single PoE+ PSE Controller
Maker Linear Technology
PDF Download

LTC4274 Datasheet PDF






Similar Datasheet

1 LTC4270 12-Port PoE/PoE+/LTPoE++ PSE Controller
Linear Technology
2 LTC4271 12-Port PoE/PoE+/LTPoE++ PSE Controller
Linear Technology
3 LTC4274 Single PoE+ PSE Controller
Linear Technology
4 LTC4274A Single PoE/PoE+/LTPoE++ PSE Controller
Linear Technology
5 LTC4274C Single PoE/PoE+/LTPoE++ PSE Controller
Linear Technology
6 LTC4278 IEEE 802.3at PD
Linear Technology
7 LTC4279 Single Port PoE/PoE+/LTPoE++ PSE Controller
Analog Devices





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z

Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy