LTC4258 Series
Quad IEEE 802.3af Power over Ethernet Controller with Integrated Detection
Manufacturer: Analog Devices Inc./Maxim Integrated
Catalog
Quad IEEE 802.3af Power over Ethernet Controller with Integrated Detection
| Part | Supplier Device Package | Voltage - Supply [Max] | Voltage - Supply [Min] | Current - Supply | Type | Standards | Internal Switch(s) | Number of Channels [custom] | Mounting Type | Package / Case | Operating Temperature [Max] | Operating Temperature [Min] | Power - Max [Max] | Auxiliary Sense |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 Analog Devices Inc./Maxim Integrated | 36-SSOP | 57 V | 47 V | 2 mA | Controller (PSE) | 802.3af (PoE) | 4 | Surface Mount | 36-BSOP (0.295" 7.50mm Width) | 70 °C | 0 °C | 15.4 W | ||
 Analog Devices Inc./Maxim Integrated | 36-SSOP | 57 V | 47 V | 2 mA | Controller (PSE) | 802.3af (PoE) | 4 | Surface Mount | 36-BSOP (0.295" 7.50mm Width) | 70 °C | 0 °C | 15.4 W |
Description
AI
The LTC4258 is a quad –48V Hot Swap™controller designed for use in IEEE 802.3af compliant Power Sourcing Equipment (PSE). It consists of four independent ports, each with output current limit, short-circuit protection, complete Powered Device (PD) detection and classification capability, and programmable PD disconnect using DC sensing. Used with power MOSFETs and passives as in Figure 1, the LTC4258 can implement a complete IEEE 802.3af-compliant PSE.The LTC4258 can operate autonomously or be controlled by an I2C serial interface. Up to 16 LTC4258s may coexist on the same data bus, allowing up to 64 powered Ethernet ports to be controlled with only two digital lines. Fault conditions are optionally signaled with theINTpin to eliminate software polling.External power MOSFETs, current sense resistors and diodes allow easy scaling of current and power dissipation levels and provide protection against voltage and current spikes and ESD events.The LTC4258 is available in a 36-pin SSOP package.Analog Devices also provides solutions for 802.3af PD applications with the LTC4257, LTC4257-1, and LTC4267.ApplicationsIEEE 802.3af Compliant Endpoint and Midspan Power SourcesIP Phone SystemsDTE Power Distribution