參數(shù)資料
型號(hào): LTC1737
廠商: Linear Technology Corporation
元件分類(lèi): 基準(zhǔn)電壓源/電流源
英文描述: RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
中文描述: 抗輻射高效,5安培開(kāi)關(guān)穩(wěn)壓器
文件頁(yè)數(shù): 1/32頁(yè)
文件大小: 1975K
代理商: LTC1737
LTC4267
1
4267f
FEATURES
DESCRIPTIO
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 25k
Ω
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.
U
APPLICATIU
TYPICAL APPLICATIO
U
Class 2 PD with 3.3V Isolated Power Supply
802 is a registered trademark of Institute of Electrical and Electronics Engineers, Inc.
P
VCC
PWRGD
NGATE
SENSE
I
TH
/RUN
V
FB
PGND
P
OUT
V
PORTP
R
CLASS
SIGDISA
V
PORTN
LTC4267
+
+
R
68.1
1%
5μF
MIN
10k
470
100k
60.4k
P
VCC
4.7μF
P
VCC
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
6.8
k
10
k
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
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 25k
Ω
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
相關(guān)PDF資料
PDF描述
LTC4257-1 Power over Ethernet Interface Controller with Dual Current Limit
LTC4257CDD-1 Power over Ethernet Interface Controller with Dual Current Limit
LTC4267 RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
LTC4267IDHC RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
LTC4267IGN RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
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