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LTC4257IDD-1 Datasheet

  • LTC4257IDD-1

  • Power over Ethernet Interface Controller with Dual Current L...

  • 20頁

  • LINER

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LTC4257-1
IEEE 802.3af PD
Power over Ethernet Interface
Controller with Dual Current Limit
FEATURES
s
s
s
s
s
s
s
s
s
DESCRIPTIO
Complete Power Interface Port for IEEE 802
廬
.3af
Powered Devices (PDs)
Onboard 100V, 400mA Power MOSFET
Precision Dual Level Current Limit
Onboard 25k Signature Resistor with Disable
Programmable Classification Current (Class 0-4)
Undervoltage Lockout
Thermal Overload Protection
Power Good Signal
Available in 8-Pin SO and Low Profile (3mm
脳
3mm)
DFN Packages
APPLICATIO S
s
s
s
IP Phone Power Management
Wireless Access Points
Telecom Power Control
The LTC
廬
4257-1 provides complete signature and power
interface functions for a device operating in an IEEE
802.3af Power over Ethernet (PoE) system. The LTC4257-1
simplifies Powered Device (PD) design by incorporating
the 25k signature resistor, classification current source,
input current limit, undervoltage lockout, thermal over-
load protection, signature disable and power good signal-
ling, all in a single 8-pin package. The LTC4257-1 includes
a precision, dual level current limit circuit. This allows it to
charge large load capacitors and interface with legacy
Power over Ethernet systems while maintaining compat-
ibility with the current IEEE 802.3af specification. By
incorporating a high voltage power MOSFET onboard, the
LTC4257-1 provides the system designer with reduced
cost while also saving board space.
The LTC4257-1 can interface directly with a variety of Lin-
ear Technology DC/DC converter products to provide a cost
effective power solution for IP phones, wireless access
points and other PDs. Linear Technology also provides
network power controllers for Power Sourcing Equipment
(PSE) applications.
The LTC4257-1 is available in the 8-pin SO and low profile
(3mm
脳
3mm) DFN packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
802 is a registered trademark of Institute of Electrical and Electronics Engineers, Inc.
TYPICAL APPLICATIO
Powered Device (PD)
~
鈥?8V FROM
POWER SOURCING
EQUIPMENT
(PSE)
+
0.1碌F
SMAJ58A
LTC4257-1
GND
R
CLASS
SIGDISA
5碌F
MIN
100k
+
DF01SA
SWITCHING
POWER SUPPLY
SHDN
RTN
~
鈥?/div>
R
CLASS
V
IN
PWRGD
V
OUT
U
V
IN
U
U
+
3.3V
TO LOGIC
42571 TA01
鈥?/div>
42571fa
1

LTC4257IDD-1 產(chǎn)品屬性

  • 121

  • 集成電路 (IC)

  • PMIC - 熱交換

  • -

  • 以太網(wǎng)供電開關(guān)（PoE）

  • IP 電話，LAN 網(wǎng)絡(luò)供電，網(wǎng)絡(luò)路由器和交換機(jī)

  • 是

  • 350mA

  • -

  • -40°C ~ 85°C

  • 表面貼裝

  • 8-WFDFN 裸露焊盤

  • 8-DFN-EP（3x3）

  • 管件

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