LTC4257CS8#PBF
ActiveIEEE 802.3AF PD POWER OVER ETHERNET INTERFACE CONTROLLER
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LTC4257CS8#PBF
ActiveIEEE 802.3AF PD POWER OVER ETHERNET INTERFACE CONTROLLER
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Technical Specifications
Parameters and characteristics for this part
| Specification | LTC4257CS8#PBF |
|---|---|
| Auxiliary Sense | False |
| Current - Supply | 3 mA |
| Internal Switch(s) | True |
| Mounting Type | Surface Mount |
| Number of Channels [custom] | 1 |
| Operating Temperature [Max] | 70 °C |
| Operating Temperature [Min] | 0 °C |
| Package / Case | 0.154 in |
| Package / Case | 8-SOIC |
| Package / Case | 3.9 mm |
| Power - Max [Max] | 12.95 W |
| Standards | 802.3af (PoE) |
| Supplier Device Package | 8-SO |
| Type | Controller (PD) |
| Voltage - Supply | 57 V |
LTC4257 Series
IEEE 802.3af PD Power over Ethernet Interface Controller
| Part | Supplied Contents | Function | Type | Utilized IC / Part | Embedded | Contents | Voltage - Supply | Current - Supply | Auxiliary Sense | Package / Case | Internal Switch(s) | Power - Max [Max] | Supplier Device Package | Operating Temperature [Max] | Operating Temperature [Min] | Standards | Number of Channels [custom] | Mounting Type | Package / Case | Package / Case |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 Analog Devices Inc./Maxim Integrated | Board(s) | Power over Ethernet (PoE) | Power Management | LTC3825 LTC4257-1 | Board(s) | |||||||||||||||
 Analog Devices Inc./Maxim Integrated | Controller (PD) | 57 V | 3 mA | 8-WFDFN Exposed Pad | 12.95 W | 8-DFN (3x3) | 85 °C | -40 C | 802.3af (PoE) | 1 | Surface Mount | |||||||||
 Analog Devices Inc./Maxim Integrated | Controller (PD) | 57 V | 3 mA | 8-SOIC | 12.95 W | 8-SO | 85 °C | -40 C | 802.3af (PoE) | 1 | Surface Mount | 0.154 in | 3.9 mm | |||||||
Analog Devices Inc./Maxim Integrated | Controller (PD) | 57 V | 3 mA | 8-SOIC | 12.95 W | 8-SO | 70 °C | 0 °C | 802.3af (PoE) | 1 | Surface Mount | 0.154 in | 3.9 mm | |||||||
 Analog Devices Inc./Maxim Integrated | Controller (PD) | 57 V | 3 mA | 8-WFDFN Exposed Pad | 12.95 W | 8-DFN (3x3) | 85 °C | -40 C | 802.3af (PoE) | 1 | Surface Mount | |||||||||
Analog Devices Inc./Maxim Integrated | Controller (PD) | 57 V | 3 mA | 8-WFDFN Exposed Pad | 12.95 W | 8-DFN (3x3) | 70 °C | 0 °C | 802.3af (PoE) | 1 | Surface Mount | |||||||||
Analog Devices Inc./Maxim Integrated | Controller (PD) | 57 V | 3 mA | 8-WFDFN Exposed Pad | 12.95 W | 8-DFN (3x3) | 85 °C | -40 C | 802.3af (PoE) | 1 | Surface Mount | |||||||||
Analog Devices Inc./Maxim Integrated | Controller (PD) | 57 V | 3 mA | 8-WFDFN Exposed Pad | 12.95 W | 8-DFN (3x3) | 70 °C | 0 °C | 802.3af (PoE) | 1 | Surface Mount | |||||||||
Analog Devices Inc./Maxim Integrated | Controller (PD) | 57 V | 3 mA | 8-SOIC | 12.95 W | 8-SO | 85 °C | -40 C | 802.3af (PoE) | 1 | Surface Mount | 0.154 in | 3.9 mm | |||||||
Analog Devices Inc./Maxim Integrated | Controller (PD) | 57 V | 3 mA | 8-SOIC | 12.95 W | 8-SO | 70 °C | 0 °C | 802.3af (PoE) | 1 | Surface Mount | 0.154 in | 3.9 mm |
Pricing
Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly
| Distributor | Package | Quantity | $ | Updated |
|---|---|---|---|---|
| Digikey | N/A | 1412 | $ 4.40 | 1m+ |
| Tube | 1 | $ 4.48 | 1m+ | |
| 10 | $ 2.97 | |||
| 25 | $ 2.58 | |||
| 100 | $ 2.14 | |||
| 250 | $ 1.92 | |||
| 500 | $ 1.79 | |||
| 1000 | $ 1.68 | |||
| 2500 | $ 1.57 | |||
| 5000 | $ 1.50 | |||
Description
General part information
LTC4257 Series
The LTC4257 provides complete signature and power interface functions for a device operating in an IEEE 802.3af Power over Ethernet (PoE) system. The LTC4257 simplifies Powered Device (PD) design by incorporating the 25k signature resistor, the classification current source, input current limit with thermal foldback, undervoltage lockout and power good signaling, all in a single 8-pin package. By incorporating a high voltage power MOSFET onboard, the LTC4257 provides the system designer with reduced cost while also saving board space.The LTC4257 can interface directly with a variety of ADI's DC/DC converter products to provide a cost effective power solution for IP phones, wireless access points and other PDs. Analog Devices also provides solutions for Power Sourcing Equipment (PSE) applications with quad network power controllers.The LTC4257 is available in the 8-pin SO and low profile (3mm × 3mm) DFN packages.ApplicationsIP Phone Power ManagementWireless Access PointsTelecom Power Control
Documents
Technical documentation and resources