LTC4267 LINER [Linear Technology], LTC4267 Datasheet
LTC4267
Manufacturer Part Number
LTC4267
Description
Power over Ethernet IEEE 802.3af PD Interface with Integrated Switching Regulator
Manufacturer
LINER [Linear Technology]
Datasheet
1.LTC4267.pdf
(32 pages)
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FEATURES
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APPLICATIO S
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All other trademarks are the property of their respective owners.
802 is a registered trademark of Institute of Electrical and Electronics Engineers, Inc.
TYPICAL APPLICATIO
IP Phone Power Management
Wireless Access Points
Security Cameras
Power over Ethernet
, LTC and LT are registered trademarks of Linear Technology Corporation.
Complete Power Interface Port for IEEE 802
Powered Device (PD)
Onboard 100V, 400mA UVLO Switch
Precision Dual Level Inrush Current Limit
Integrated Current Mode Switching Regulator
Onboard 25kΩ Signature Resistor with Disable
Programmable Classifi cation Current (Class 0-4)
Thermal Overload Protection
Power Good Signal
Integrated Error Amplifi er and Voltage Reference
Low Profi le 16-Pin SSOP and 3mm × 5mm DFN
Packages
SPARE PAIR
DATA PAIR
FROM
FROM
–48V
–48V
U
HD01
HD01
+
+
–
–
U
0.1µF
Class 2 PD with 3.3V Isolated Power Supply
R
SMAJ58A
68.1Ω
CLASS
1%
®
.3af
Integrated Switching Regulator
V
R
SIGDISA
V
PORTP
PORTN
CLASS
LTC4267
IEEE 802.3af PD Interface with
I
PWRGD
TH
NGATE
SENSE
PGND
/RUN
P
P
VCC
OUT
V
FB
DESCRIPTIO
The LTC
ered Device (PD) interface with a current mode switching
regulator, providing a complete power solution for PD
applications. The LTC4267 integrates the 25kΩ signature
resistor, classifi cation current source, thermal overload pro-
tection, signature disable and power good signal along with
an undervoltage lockout optimized for use with the IEEE-
required diode bridge. The precision dual level input current
limit allows the LTC4267 to charge large load capacitors
and interface with legacy PoE systems.
The current mode switching regulator is designed for
driving a 6V rated N-channel MOSFET and features pro-
grammable slope compensation, soft-start, and constant
frequency operation, minimizing noise even with light
loads. The LTC4267 includes an onboard error amplifi er
and voltage reference allowing use in both isolated and
nonisolated confi gurations.
The LTC4267 is available in space saving, low profi le
16-pin SSOP or DFN packages.
+
BA5516
®
10k
4267 combines an IEEE 802.3af compliant Pow-
4.7µF
P
P
10k
VCC
VCC
6.8k
Power over Ethernet
+
Si3440
5µF
MIN
0.1Ω
PS2911
U
•
PA1133
TLV431
•
SBM1040
320µF
22nF
470
100k
60.4k
LTC4267
CHASSIS
4267 TA01
3.3V
1.5A
1
4267f
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