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LTC4267-3 PDF预览

LTC4267-3

更新时间： 2024-09-12 05:43:59
品牌 Logo 应用领域
凌特 - Linear 稳压器开关光电二极管以太网
页数 文件大小 规格书
32页 708K
描述
Power over Ethernet IEEE 802.3af PD Interface with Integrated Switching Regulator

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中文翻译

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LTC4267-3 数据手册

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LTC4267-3  
Power over Ethernet  
IEEE 802.3af PD Interface with  
Integrated Switching Regulator  
U
FEATURES  
n
DESCRIPTIO  
Complete Power Interface Port for IEEE 802®.3af  
The LTC®4267-3 combines an IEEE 802.3af compliant  
PoweredDevice(PD)interfacewitha300kHzcurrentmode  
switching regulator, providing a complete power solution  
for PD applications. The LTC4267-3 integrates the 25k  
signature resistor, classification current source, thermal  
overload protection, signature disable and power good  
signal along with an undervoltage lockout optimized for  
use with the IEEE-required diode bridge. The LTC4267-3  
providesanincreasedoperationalcurrentlimit,maximizing  
power available for class 3 applications.  
Powered Device (PD)  
n
Onboard 100V, UVLO Switch  
n
Constant-Frequency 300kHz Operation  
n
Precision Dual Level Inrush Current Limit  
n
Integrated Current Mode Switching Regulator  
n
Onboard 25k Signature Resistor with Disable  
n
Programmable Classification Current (Class 0-4)  
n
Thermal Overload Protection  
Power Good Signal  
n
n
Integrated Error Amplifier and Voltage Reference  
Low Profile 16-Pin SSOP or DFN Packages  
The 300kHz current mode switching regulator provides  
higher output power or smaller external size compared  
to its lower frequency counterparts. The LTC4267-3 is  
designed for driving a 6V rated N-channel MOSFET and  
features programmable slope compensation, soft-start,  
and constant-frequency operation, minimizing noise even  
with light loads. The LTC4267-3 includes an onboard er-  
ror amplifier and voltage reference allowing use in both  
isolated and nonisolated configurations.  
n
U
APPLICATIO S  
n
IP Phone Power Management  
n
Wireless Access Points  
n
Security Cameras  
Power over Ethernet  
n
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
The LTC4267-3 is available in a space saving, low profile  
16-pin SSOP or DFN packages.  
U
TYPICAL APPLICATIO  
Class 2 PD with 3.3V Isolated Power Supply  
PA1133 SBM1040  
3.3V  
1.5A  
10k  
+
–48V  
•
HD01  
FROM  
V
P
PORTP  
VCC  
+
320µF  
MIN  
P
CHASSIS  
DATA PAIR  
5µF  
VCC  
+
–
•
MIN  
4.7µF  
PWRGD  
LTC4267-3  
SMAJ58A  
NGATE  
SENSE  
/RUN  
Si3440  
10k  
0.1µF  
0.1Ω  
P
VCC  
R
I
CLASS  
TH  
470Ω  
+
HD01  
R
–48V  
FROM  
SPARE PAIR  
CLASS  
68.1Ω  
6.8k  
V
FB  
1%  
100k  
–
22nF  
SIGDISA  
PGND  
BAS516  
V
P
PORTN  
OUT  
PS2911  
60.4k  
TLV431  
42671 TA01  
42673f  
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