LTC4265
19
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For more information www.linear.com/LTC4265
100k12k
25mΩ
FDS2582
14k
3.01k
20Ω
30k
15µF
16V
29.4k
383k
30.9Ω
BAS21
1.8k 38.3k
10k
51k
1nF
10k 20k
15Ω
15Ω
150Ω
PE-68386
BAT54
100Ω
33pF
10µF
100V
0.1µF
100V
SMAJ58A
B1100
10Ω
B1100 × 8 PLCS
1µF
100V
0.1µF
4.7nF
2.2nF
MMBT3906 MMBT3904
1µF
1µF
16V
PA2467NL
4265 TA02
t
ON
SYNC
PGDLY
UVLO
SENSE
V
C
SENSE
+
R
CMP
ENDLY OSC SFST
LT3825
GND
SG
FB
V
CC
SG
SG
PG
C
CMP
GND
R
CLASS
SHDN
LTC4265
T2PSE
V
IN
V
OUT
4.7µH
–54V FROM
DATA PAIR
–54V FROM
SPARE PAIR
47pF
10µF
16V
0.33µH
12V
2A
47µF
16V
FDS3572
+
GND
4
5
1
8
GND
LTV357TA
T2P
(TO MICROCONTROLLER)
2.2nF
2kV
470pF
2kV
+
High Efficiency 12V Isolated Power Supply
(Contact LTC for 3.3V and 5V Power Supply Applications)
applicaTions inForMaTion
LOAD CURRENT (A)
0.2 0.4
EFFICIENCY (%)
85
89
87
2.0
4265 TA02a
81
83
77
79
0.6 0.8
1.21.0
1.6 1.81.4
93
91
57V48V
EXCLUDING BRIDGES
42V
LOAD CURRENT (A)
0.2
OUTPUT (V)
12.0
12.1
12.2
12.3
2.0
4265 TA02b
11.8
11.9
11.6
11.7
0.6 0.80.4
1.21.0
1.6 1.81.4
12.4
57V48V42V
Efficiency vs Load Current Output Regulation vs Load Current
LTC4265
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For more information www.linear.com/LTC4265
package DescripTion
DE/UE Package
12-Lead Plastic DFN (4mm × 3mm)
(Reference LTC DWG # 05-08-1695 Rev D)
4.00 ±0.10
(2 SIDES)
3.00 ±0.10
(2 SIDES)
NOTE:
1. DRAWING PROPOSED TO BE A VARIATION OF VERSION
(WGED) IN JEDEC PACKAGE OUTLINE M0-229
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm 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
0.40 ±0.10
BOTTOM VIEW—EXPOSED PAD
1.70 ±0.10
0.75 ±0.05
R = 0.115
TYP
R = 0.05
TYP
2.50 REF
16
127
PIN 1 NOTCH
R = 0.20 OR
0.35 × 45°
CHAMFER
PIN 1
TOP MARK
(NOTE 6)
0.200 REF
0.00 – 0.05
(UE12/DE12) DFN 0806 REV D
2.50 REF
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED
2.20 ±0.05
0.70 ±0.05
3.60 ±0.05
PACKAGE OUTLINE
3.30 ±0.10
0.25 ±0.05
0.50 BSC
1.70 ±0.05
3.30 ±0.05
0.50 BSC
0.25 ±0.05
DE/UE Package
12-Lead Plastic DFN (4mm × 3mm)
(Reference LTC DWG # 05-08-1695 Rev D)
LTC4265
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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 representation
that the interconnection of its circuits as described herein will not infringe on existing patent rights.
revision hisTory
REV DATE DESCRIPTION PAGE NUMBER
B 07/14 Revised Exposed Pad Connection Requirements
Added Note 10 for Overtemperature Protection
Added Input Series Resistance Section. Added SMAJ58A Recommendation
Revised Figure 9 (Option 2)
Revised Figure 10
Revised High Efficiency 12V Isolated Power Supply Schematic
Update DE/UE Package Drawings to Rev. D
Revised PoE-Based Self-Driven Synchronous Forward Power Supply Schematic
2
3
13
15
16
17
19
20, 22
(Revision history begins at Rev B)

LTC4265IDE#TRPBF

Mfr. #:
Manufacturer:
Analog Devices Inc.
Description:
Power Switch ICs - POE / LAN IEEE 802.3 at Hi Pwr PD Int Cntr w/ 2-Ev
Lifecycle:
New from this manufacturer.
Delivery:
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Payment:
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