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LTC1737 Datasheet

  • LTC1737

  • Power over Ethernet IEEE 802.3af PD Interface with Integrate...

  • 1975.24KB

  • 32頁

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FEATURES
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LTC4267
Power over Ethernet
IEEE 802.3af PD Interface with
Integrated Switching Regulator
DESCRIPTIO
The LTC
廬
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 25k惟 signature
resistor, classi鏗乧ation 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 ampli鏗乪r
and voltage reference allowing use in both isolated and
nonisolated con鏗乬urations.
The LTC4267 is available in space saving, low pro鏗乴e
16-pin SSOP or DFN packages.
Complete Power Interface Port for IEEE 802
廬
.3af
Powered Device (PD)
Onboard 100V, 400mA UVLO Switch
Precision Dual Level Inrush Current Limit
Integrated Current Mode Switching Regulator
Onboard 25k惟 Signature Resistor with Disable
Programmable Classi鏗乧ation Current (Class 0-4)
Thermal Overload Protection
Power Good Signal
Integrated Error Ampli鏗乪r and Voltage Reference
Low Pro鏗乴e 16-Pin SSOP and 3mm
脳
5mm DFN
Packages
APPLICATIO S
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IP Phone Power Management
Wireless Access Points
Security Cameras
Power over Ethernet
, LTC and LT are registered trademarks of Linear Technology Corporation.
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
Class 2 PD with 3.3V Isolated Power Supply
PA1133
10k
鈥?8V
FROM
DATA PAIR
SBM1040
3.3V
1.5A
+
HD01
V
PORTP
P
VCC
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SMAJ58A
0.1碌F
+
P
VCC
4.7碌F
+
PWRGD
LTC4267
NGATE
SENSE
R
CLASS
I
TH
/RUN
V
FB
SIGDISA
V
PORTN
PGND
P
OUT
5碌F
MIN
10k
P
VCC
Si3440
0.1鈩?/div>
470
鈥?8V
FROM
SPARE PAIR
+
HD01
鈥?/div>
R
CLASS
68.1鈩?/div>
1%
6.8k
22nF
100k
BA5516
PS2911
U
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U
U
320碌F
鈥?/div>
CHASSIS
TLV431
60.4k
4267 TA01
4267f
1

LTC1737相關(guān)型號PDF文件下載

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    Programmable Micropower Hex Translator/ Receiver/Driver
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    Programmable Micropower Hex Translator/ Receiver/Driver
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    “Inductorless” 5V to + 5V Converter
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    “Inductorless” 5V to + 5V Converter
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