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LTC4274AIUHF-4#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30
LTC4274A/LTC4274C
28
4274acfd
For more information www.linear.com/LTC4274A
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
PACKAGE DESCRIPTION
UHF Package
38-Lead Plastic QFN (5mm × 7mm)
(Reference LTC DWG # 05-08-1701 Rev C)
5.00 ± 0.10
NOTE:
1. DRAWING CONFORMS TO JEDEC PACKAGE
OUTLINE M0-220 VARIATION WHKD
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
PIN 1
TOP MARK
(SEE NOTE 6)
37
1
2
38
BOTTOM VIEW—EXPOSED PAD
5.50 REF
5.15 ± 0.10
7.00 ± 0.10
0.75 ± 0.05
R = 0.125
TYP
R = 0.10
TYP
0.25 ± 0.05
(UH) QFN REF C 1107
0.50 BSC
0.200 REF
0.00 – 0.05
RECOMMENDED SOLDER PAD LAYOUT
APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED
3.00 REF
3.15 ± 0.10
0.40 ±0.10
0.70 ± 0.05
0.50 BSC
5.5 REF
3.00 REF
3.15 ± 0.05
4.10 ± 0.05
5.50 ± 0.05
5.15 ± 0.05
6.10 ± 0.05
7.50 ± 0.05
0.25 ± 0.05
PACKAGE
OUTLINE
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.20mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION
ON THE TOP AND BOTTOM OF PACKAGE
PIN 1 NOTCH
R = 0.30 TYP OR
0.35 × 45° CHAMFER
LTC4274A/LTC4274C
29
4274acfd
For more information www.linear.com/LTC4274A
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
REVISION HISTORY
REV DATE DESCRIPTION PAGE NUMBER
A 9/11 Changed GATE typ voltage to 12V. 3, 15, 21
Revised V
ILD
text under Digital Interface. 4
Table 4 reference and caption changed to Table 5. 20
Revised power supply voltage figures under Power Supplies and Bypassing. 24
Text CUT/LIM changed to I
CUT
/I
LIM
in the Related Parts section. 30
Specified SMAJ58A for Zener diode. 30
B 1/12 Changed LTPoE
++
power levels from 35W, 45W to 38.7W, 52.7W respectively.
Revised Max value for V
ILD
I
2
C Input Low Voltage.
Clarified AUTO Pin mode relationship to Reset pin.
1, 2, 16, 17
4
18
C 8/12 Table 1: Changed twisted pair requirement from 2-pair to 4-pair for 38.7W and 52.7W 17
D 7/15 Updated surge protection recommendations
Simplified Power over Ethernet system diagram
Added component value (Figure 15)
1, 24, 26, 27, 30
16
25
LTC4274A/LTC4274C
30
4274acfd
For more information www.linear.com/LTC4274A
LINEAR TECHNOLOGY CORPORATION 2011
LT 0715 REV D • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com/LTC4274A
RELATED PARTS
PART NUMBER DESCRIPTION COMMENTS
LTC4270/LTC4271 12-Port PoE/PoE
+
/LTPoE
++
PSE Controller Transformer Isolation, Supports Type 1, Type 2 and LTPoE
++
PDs
LTC4266 Quad IEEE 802.3at PoE PSE Controller 2-Event Classification, Programmable I
CUT
/I
LIM
LTC4266A/LTC4266C Quad IEEE 802.3at PoE PSE Controller 13W through 90W Support
LTC4274 Single IEEE 802.3at PoE PSE Controller 2-Event Classification, Programmable I
CUT
/I
LIM
LTC4265 IEEE 802.3at PD Interface Controller 100V, 1A Internal Switch, 2-Event Classification Recognition
LTC4267 IEEE 802.3af PD Interface with Integrated Switching
Regulator
Internal 100V, 400mA Switch, Dual Inrush Current,
Programmable Class
LTC4269-1 IEEE 802.3at PD Interface with Integrated Flyback
Switching Regulator
2-Event Classification, Programmable Classification, Synchronous
No-Opto Flyback Controller, 50kHz to 250kHz, Auxiliary Support
LTC4269-2 IEEE 802.3at PD Interface with Integrated Forward
Switching Regulator
2-Event Classification,
Programmable Classification, Synchronous
Forward Controller, 100kHz to 500kHz, Auxiliary Support
LTC4278 IEEE 802.3at PD Interface with Integrated Flyback
Switching Regulator
2-Event Classification, Programmable Classification, Synchronous
No-Opto Flyback Controller, 50kHz to 250kHz, 12V Auxiliary Support
One Complete 100base-t Isolated Powered Ethernet IEEE 802.3at Port
TYPICAL APPLICATION
4274AC TA02
1
2
3
4
5
6
7
8
2k
2k
0.1µF
200Ω
200Ω
200Ω
200Ω
U2
U3
U1
HCPL-063L
HCPL-063L
V
DD
CPU
SCL
SDA
GND CPU
INTERRUPT
TO
CONTROLLER
PHY
(NETWORK
PHYSICAL
LAYER
CHIP)
V
EE
SENSE GATE OUT
DGND
SCL
SDAIN
SDAOUT
INT
AGND
R
SENSE
0.25Ω
Q1
T1
LTC4274AC
V
DD
ISOLATED
–54V
S1B
ISOLATED
3.3V
0.01µF
200V
0.01µF
200V
0.01µF
200V
0.01µF
200V
75Ω75Ω
75Ω75Ω
RJ45
CONNECTOR
1000pF
2000V
•
•
•
•
•• ••
•
•
•
•
FB1
FB2
Q1: FAIRCHILD IRFM120A OR PHILIPS PHT6NQ10T
U1: FAIRCHILD NC7WZ17
U2, U3: AGILENT HCPL-063L
FB1, FB2: TDK MPZ2012S601A
T1: PULSE H6096NL OR COILCRAFT ETH1-230LD
0.1µF
S1B
0.22µF
100V
X7R
+
C
BULK
TVS
BULK
SMAJ58A
10Ω
1µF
100V
X7R
0.1µF
SMAJ5.0A
+
10Ω
10µF
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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