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LTC4274AIUHF-4#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30
LTC4274A/LTC4274C
1
4274acfd
For more information www.linear.com/LTC4274A
n
LTPoE
++
PSE Switches/Routers
n
LTPoE
++
PSE Midspans
n
IEEE 802.3at Type 1 PSE Switches/Routers
n
IEEE 802.3at Type 1 PSE Midspans
APPLICATIONS
FEATURES DESCRIPTION
Single PoE/PoE
+
/LTPoE
++
PSE Controller
The LT C
®
4274A is a single Power Sourcing Equipment
(PSE) controller capable of delivering up to 90W of LTPoE
++
power to a compatible LTPoE
++
Powered Device (PD). A
proprietary detection/classification scheme allows mutual
identification between a LTPoE
++
PSE and LTPoE
++
PD
while remaining compatible and interoperable with existing
Type 1 (13W) and Type 2 (25.5W) PDs. The LTC4274A
feature set is a superset of the popular LTC4274. These
PSE controllers feature low-R
ON
external MOSFETs and
0.25Ω sense resistors which are especially important at
the LTPoE
++
current levels to maintain the lowest possible
heat dissipation.
The LTC4274C targets fully automatic PSE systems power-
ing Type 1 (up to 13W) PDs.
Advanced power management features include: a 14-bit
current monitoring ADC, DAC-programmable current limit,
and versatile quick port shutdown. PD Discovery uses
a proprietary dual-mode 4-point detection mechanism
ensuring excellent immunity from false PD detection.
The LTC4274A/LTC4274C includes an I
2
C serial interface
operable up to 1MHz.
The LTC4274A/LTC4274C is available in multiple power
grades, allowing delivered PD power of 13W, 25.5W,
38.7W, 52.7W, 70W and 90W. These controllers are avail-
able in a 38-lead 5mm × 7mm QFN package.
n
Compliant with IEEE 802.3at Type 1 and 2
n
Low Power Dissipation
n
0.25Ω Sense Resistance Per Channel
n
Very High Reliability 4-Point PD Detection
n
2-Point Forced Voltage
n
2-Point Forced Current
n
High Capacitance Legacy Device Detection
n
1MHz I
2
C Compatible Serial Control Interface
n
Midspan Backoff Timer
n
Supports 2-Pair and 4-Pair Output Power
n
Available in Multiple Power Grades
n
LTC4274A-1: LTPoE
++
™ 38.7W
n
LTC4274A-2: LTPoE
++
52.7W
n
LTC4274A-3: LTPoE
++
70W
n
LTC4274A-4: LTPoE
++
90W
n
LTC4274C: PoE 13W
n
Available in 38-Lead 5mm × 7mm QFN Package
TYPICAL APPLICATION
Complete Single-Port Ethernet High Power Source
L, LT , LT C , LT M, Linear Technology and the Linear logo are registered trademarks and
LTPoE
++
are trademarks of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
4274AC TA01
V
DD
DGND
AGND
V
EE
SENSE
–54V
1µF
100V
SMAJ58A
GATE OUT
PORT
0.22µF
100V
S1B
S1B
–54V
AD0 AD1 AD2 AD3 SCL SDAIN SDAOUT INT
AUTO
MSD
RESET
MID
0.1µF
LTC4274AC
SHDN
SMAJ5.0A
10Ω
10Ω
3.3V
+
10µF
+
C
BULK
TVS
BULK
LTC4274A/LTC4274C
2
4274acfd
For more information www.linear.com/LTC4274A
ABSOLUTE MAXIMUM RATINGS
PIN CONFIGURATION
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION MAX PWR TEMPERATURE RANGE
LTC4274CIUHF#PBF LTC4274CIUHF#TRPBF 4274C 38-Lead (5mm × 7mm) Plastic QFN 13W –40°C to 85°C
LTC4274AIUHF-1#PBF LTC4274AIUHF-1#TRPBF 4274A1 38-Lead (5mm × 7mm) Plastic QFN 38.7W –40°C to 85°C
LTC4274AIUHF-2#PBF LTC4274AIUHF-2#TRPBF 4274A2 38-Lead (5mm × 7mm) Plastic QFN 52.7W –40°C to 85°C
LTC4274AIUHF-3#PBF LTC4274AIUHF-3#TRPBF 4274A3 38-Lead (5mm × 7mm) Plastic QFN 70W –40°C to 85°C
LTC4274AIUHF-4#PBF LTC4274AIUHF-4#TRPBF 4274A4
38-Lead (5mm × 7mm) Plastic QFN 90W –40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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/
13 14 15 16
TOP VIEW
V
EE
39
UHF PACKAGE
38-LEAD (5mm × 7mm) PLASTIC QFN
EXPOSED PAD IS V
EE
(PIN 39) MUST BE SOLDERED TO PCB
T
JMAX
= 125°C, θ
JA
= 34°C/W
17 18 19
38 37 36 35 34 33 32
24
25
26
27
28
29
30
31
8
7
6
5
4
3
2
1
SDAOUT
NC
SDAIN
AD3
AD2
AD1
AD0
DNC
NC
DGND
NC
NC
GATE
SENSE
NC
NC
V
EE
V
EE
V
EE
NC
NC
V
EE
NC
NC
SCL
INT
MID
RESET
MSD
AUTO
OUT
V
DD
SHDN
DGND
DGND
DGND
AGND
V
EE
23
22
21
20
9
10
11
12
Supply Voltages (Note 1)
AGND – V
EE
........................................... –0.3V to 80V
DGND – V
EE
........................................... –0.3V to 80V
V
DD
– DGND ......................................... –0.3V to 5.5V
Digital Pins
SCL, SDAIN, SDAOUT, INT, SHDN, MSD, AD,
RESET, AUTO, MID
........... DGND –0.3V to V
DD
+ 0.3V
Analog Pins
GATE, SENSE, OUT
................ V
EE
–0.3V to V
EE
+ 80V
Operating Temperature Range
.................–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
LTC4274A/LTC4274C
3
4274acfd
For more information www.linear.com/LTC4274A
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
EE
Main PoE Supply Voltage AGND
– V
EE
For IEEE Type 1 Compliant Output
For IEEE Type 2 Compliant Output
For LTPoE
++
Compliant Output
l
l
l
45
51
54.75
57
57
57
V
V
V
Undervoltage Lockout AGND
– V
EE
l
20 25 30 V
V
DD
V
DD
Supply Voltage V
DD
– DGND
l
3.0 3.3 4.3 V
Undervoltage Lockout
l
2.2 V
Allowable Digital Ground Offset DGND
– V
EE
l
25 57 V
I
EE
V
EE
Supply Current (AGND
– V
EE
) = 55V
l
–2.4 –5 mA
I
DD
V
DD
Supply Current (V
DD
– DGND) = 3.3V
l
1.1 3 mA
Detection
Detection Current
– Force Current First Point, AGND
– V
OUT
= 9V
Second Point, AGND
– V
OUT
= 3.5V
l
l
220
140
240
160
260
180
µA
µA
Detection Voltage – Force Voltage AGND
– V
OUT
, 5µA ≤ I
OUT
≤ 500µA
First Point
Second Point
l
l
7
3
8
4
9
5
V
V
Detection Current Compliance AGND
– V
OUT
= 0V
l
0.8 0.9 mA
V
OC
Detection Voltage Compliance AGND
– V
OUT
, Open Port
l
10.4 12 V
Detection Voltage Slew Rate AGND
– V
OUT
, C
PORT
= 0.15µF
l
0.01 V/µs
Minimum Valid Signature Resistance
l
15.5 17 18.5 kΩ
Maximum Valid Signature Resistance
l
27.5 29.7 32 kΩ
Classification
V
CLASS
Classification Voltage AGND
– V
OUT
, 0mA ≤ I
CLASS
≤ 50mA
l
16.0 20.5 V
Classification Current Compliance V
OUT
= AGND
l
53 61 67 mA
Classification Threshold Current Class 0 – 1
Class 1 – 2
Class
2 – 3
Class 3 – 4
Class 4 – Overcurrent
l
l
l
l
l
5.5
13.5
21.5
31.5
45.2
6.5
14.5
23
33
48
7.5
15.5
24.5
34.9
50.8
mA
mA
mA
mA
mA
V
MARK
Classification Mark State Voltage AGND
– V
OUT
, 0.1mA ≤ I
CLASS
≤ 10mA
l
7.5 9 10 V
Mark State Current Compliance V
OUT
= AGND
l
53 61 67 mA
Gate Driver
GATE Pin Pull-Down Current Port Off, V
GATE
= V
EE
+ 5V
Port Off, V
GATE
= V
EE
+ 1V
l
l
0.4
0.08
0.12
mA
mA
GATE Pin Fast Pull-Down Current V
GATE
= V
EE
+ 5V 30 mA
GATE Pin On Voltage V
GATE
– V
EE
, I
GATE
= 1µA
l
8 12 14 V
Output Voltage Sense
V
PG
Power Good Threshold Voltage V
OUT
– V
EE
l
2 2.4 2.8 V
OUT Pin Pull-Up Resistance to AGND 0V ≤ (AGND
– V
OUT
) ≤ 5V
l
300 500 700 kΩ
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. AGND – V
EE
= 54V, AGND = DGND, and V
DD
– DGND = 3.3V
unless otherwise noted. (Notes 3, 4)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30

LTC4274AIUHF-4#PBF

Mfr. #:
Buy LTC4274AIUHF-4#PBF
Manufacturer:
Analog Devices Inc.
Description:
Power Switch ICs - POE / LAN LTPoE++ 90W Single Powered Ethernet PSE
Lifecycle:
New from this manufacturer.
Delivery:
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