Electronic Components Datasheet Search |
|
LTC4257CS8-1 Datasheet(PDF) 1 Page - Linear Technology |
|
LTC4257CS8-1 Datasheet(HTML) 1 Page - Linear Technology |
1 / 20 page LTC4257-1 1 42571fa The LTC ®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 × 3mm) DFN packages. s IP Phone Power Management s Wireless Access Points s Telecom Power Control , LTC and LT are registered trademarks of Linear Technology Corporation. s Complete Power Interface Port for IEEE 802 ®.3af Powered Devices (PDs) s Onboard 100V, 400mA Power MOSFET s Precision Dual Level Current Limit s Onboard 25k Signature Resistor with Disable s Programmable Classification Current (Class 0-4) s Undervoltage Lockout s Thermal Overload Protection s Power Good Signal s Available in 8-Pin SO and Low Profile (3mm × 3mm) DFN Packages IEEE 802.3af PD Power over Ethernet Interface Controller with Dual Current Limit GND RCLASS RCLASS SMAJ58A 0.1 µF SIGDISA PWRGD LTC4257-1 VIN SHDN 100k 5 µF MIN 3.3V TO LOGIC RTN SWITCHING POWER SUPPLY VIN VOUT –48V FROM POWER SOURCING EQUIPMENT (PSE) 42571 TA01 + – + DF01SA ~ ~ + – Powered Device (PD) DESCRIPTIO FEATURES APPLICATIO S TYPICAL APPLICATIO 802 is a registered trademark of Institute of Electrical and Electronics Engineers, Inc. |
Similar Part No. - LTC4257CS8-1 |
|
Similar Description - LTC4257CS8-1 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |