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LTC4267 Datasheet(PDF) 1 Page - Linear Technology

Part No. LTC4267
Description  Power over Ethernet IEEE 802.3af PD Interface with Integrated Switching Regulator
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LTC4267 Datasheet(HTML) 1 Page - Linear Technology

 
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LTC4267
1
4267f
FEATURES
DESCRIPTIO
APPLICATIO S
TYPICAL APPLICATIO
Class 2 PD with 3.3V Isolated Power Supply
802 is a registered trademark of Institute of Electrical and Electronics Engineers, Inc.
PVCC
PWRGD
NGATE
SENSE
ITH/RUN
VFB
PGND
POUT
VPORTP
RCLASS
SIGDISA
VPORTN
LTC4267
+
+
RCLASS
68.1
1%
5µF
MIN
10k
470
100k
60.4k
PVCC
PVCC
4.7µF
320µF
22nF
PA1133
PS2911
BA5516
TLV431
SBM1040
SMAJ58A
3.3V
1.5A
CHASSIS
HD01
+
+
HD01
–48V
FROM
DATA PAIR
–48V
FROM
SPARE PAIR
4267 TA01
Si3440
0.1
6.8k
10k
0.1µF
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Power over Ethernet
IEEE 802.3af PD Interface with
Integrated Switching Regulator
The LTC
®4267 combines an IEEE 802.3af compliant Pow-
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, classification 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 amplifier
and voltage reference allowing use in both isolated and
nonisolated configurations.
The LTC4267 is available in space saving, low profile
16-pin SSOP or DFN packages.
IP Phone Power Management
Wireless Access Points
Security Cameras
Power over Ethernet
Complete Power Interface Port for IEEE 802
®.3af
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 Classification Current (Class 0-4)
Thermal Overload Protection
Power Good Signal
Integrated Error Amplifier and Voltage Reference
Low Profile 16-Pin SSOP and 3mm × 5mm DFN
Packages


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