42681fc
LTC4268-1
1
High Power PD With
Synchronous No-Opto
Flyback Controller
The LTC
?/DIV>
4268-1 is an integrated Powered Device (PD)
controller and switching regulator intended for IEEE 802.3af
and high power PoE applications up to 35W. By including
a precision dual current limit, the LTC4268-1 keeps inrush
below IEEE 802.3af current limit levels to ensure interop-
erability success while enabling high power applications
with a 750mA operational current limit.
The LTC4268-1 synchronous, current-mode, flyback
controller generates multiple supply rails in a single
conversion providing for the highest system efficiency
while maintaining tight regulation across all outputs. The
LTC4268-1 includes Linear Technologys patented No-Opto
feedback topology to provide full IEEE 802.3af isolation
without the need of opto-isolator circuitry.
The oversized power path and high performance flyback
controller of the LTC4268-1 combine to make the ultimate
solution for power hungry PoE applications such as WAPs,
PTZ security cameras, RFID readers and ultra-efficient
802.3af applications running near the 12.95W limit.
The LTC4268-1 is available in a space saving 32-pin DFN
package.
n
Robust 35W PD Front End
n
IEEE 802.3af Compliant
n
Rugged 750mA Power MOSFET With Precision Dual
Level Current Limit
n
High Performance Synchronous Flyback Controller
n
IEEE Isolation Obtained Without an Opto-Isolator
n
Adjustable Frequency from 50kHz to 250kHz
n
Tight Multi-Output Regulation With Load
Compensation
n
Onboard 25k Signature Resistor
n
Programmable Classification Current to 75mA
n
Complete Thermal and Over-Current Protection
n
Available in Compact 32-Pin 7mm ?4mm DFN
Package
n
VoIP Phones With Advanced Display Options
n
Dual-Radio Wireless Access Points
n
PTZ Security Cameras
n
RFID Readers
n
Industrial Controls
n
Magnetic Card Readers
n
High Power PoE Systems
35W High Efficiency PD Solution
169k
R
CLASS
3.01k
1%
28.7k
1%
20
47
47k
100k
BAS21
56
"
"
"
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100pF
e5礔
470礔
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3.3V
54V FROM
DATA PAIR
54V FROM
SPARE PAIR
T1
0.02
47礔
SMAJ58A
T1: PA1477NL
T2: PA0184
DF1501S
DF1501S
0.1礔
100k
20k
10k
15
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47pF
0.033礔
10nF
2.2nF
T2
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42681 TA01a
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BAT54
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12k
PGDLY
V
NEG
SYNC
R
CLASS
V
PORTN
SHDN
SENSE
V
CMP
SENSE
+
R
CMP
ENDLY OSC
LTC4268-1
GND SFST
SG
Si7336ADP
B0540W
Si4490DY
FMMT618
FMMT718
V
CC
I
LIM_EN
UVLO
PWRGD
PWRGD
V
PORTP
T1
"
PG
FB
C
CMP
+
~
~
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Typical applicaTion
DescripTion
FeaTures
applicaTions
L, LT, LTC, LTM and SwitcherCAD are registered trademarks and LTPoE++ and ThinSOT are
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners. Protected by U.S. Patents including 5841643.
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