IEEE 802.3af PD Power over Ethernet Interface Controller with Dual Current Limit Features: Complete Power Interface Port for IEEE 802®.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 x 3mm) DFN Packages

IEEE 802.3af PD Power over Ethernet Interface Controller with Dual Current Limit Features: Complete Power Interface Port for IEEE 802®.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 x 3mm) DFN Packages

Quad IEEE 802.3af Power over Ethernet Controller with AC Disconnect Features: Controls Four Independent – 48V Powered Ethernet Ports Each Port Includes: IEEE 802®.3af Compliant PD Detection and Classification Output Current Limit with Foldback Short-Circuit Protection with Fast Gate Pull-Down PD Disconnect Using AC or DC Sensing Power Good Indication Operates Autonomously or Controlled by I2C™ Serial Interface 4-Bit Programmable Digital Address Allows Control of Up to 64 Ports Programmable INT Pin Eliminates Software Polling Current and Duty Cycle Limits Protect External FETs Available in a 36-Pin SSOP Package

Quad IEEE 802.3af Power over Ethernet Controller with AC Disconnect Features: Controls Four Independent – 48V Powered Ethernet Ports Each LTC4259A-1 Port Includes: – IEEE 802®.3af Compliant PD Detection and Classification – Output Current Limit with Foldback – Short-Circuit Protection with Fast Gate Pull-Down – PD Disconnect Using AC or DC Sensing – Improved AC Disconnect – Improved UVLO Operates Autonomously or Controlled by I2C™ Serial Interface 4-Bit Programmable Digital Address Allows Control of Up to 64 Ports Current and Duty Cycle Limits Protect External FETs IMPROVED UVLO

Single IEEE 802.3af Compliant PSE Controller with Internal Switch Features: IEEE 802.3af Compliant Operation from a Single 48V Supply Fully Autonomous Operation without Microcontroller Internal MOSFET with Thermal Protection Power Management Works Across Multiple Ports with Simple RC Network Precision Inrush Control with Internal Sense Resistor Powered Device (PD) Detection and Classification AC and DC Disconnect Sensing Robust Short-Circuit Protection Pin-Selectable Detection Back-off for Midspan PSEs Classification Dependent ICUT Current Threshold LED Driver Indicates Port On and Blinks Status Codes Available in 14-Pin SO and 4mm × 3mm DFN Packages

Quad IEEE 802.3at Power Over Ethernet Controller Features: Four Independent PSE Channels Compliant with IEEE 802.3at Type 1 and 2 0.34Ω Total Channel Resistance 130mW/Port at 600mA Advanced Power Management 8-Bit Programmable Current Limit (ILIM) 7-Bit Programmable Overload Currents (ICUT) Fast Shutdown of Preselected Ports 14.5-Bit Port Current/Voltage Monitoring 2-Event Classification Very High Reliability 4-Point PD Detection 2-Point Forced Voltage 2-Point Forced Current High Capacitance Legacy Device Detection LTC4259A-1 and LTC4258 Pin and SW Compatible 1MHz I2C Compatible Serial Control Interface Midspan Backoff Timer Supports Proprietary Power Levels Above 25W Available in 38-Pin 5mm × 7mm QFN and 36-Pin SSOP Packages

Power over Ethernet IEEE 802.3af PD Interface with Integrated Switching Regulator Features: 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 25kΩ Signature Resistor with Disable Programmable Classication Current (Class 0-4) Thermal Overload Protection Power Good Signal Integrated Error Amplier and Voltage Reference Low Prole 16-Pin SSOP and 3mm × 5mm DFN Packages

Power over Ethernet IEEE 802.3af PD Interface with Integrated Switching Regulator Features: 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 25kΩ Signature Resistor with Disable Programmable Classication Current (Class 0-4) Thermal Overload Protection Power Good Signal Integrated Error Amplier and Voltage Reference Low Prole 16-Pin SSOP and 3mm × 5mm DFN Packages

Single PoE+ PSE Controller Features: Compliant with IEEE 802.3at Type 1 and 2 0.34Ω Total Channel Resistance 130mW/Port at 600mA Advanced Power Management 8-Bit Programmable Current Limit (ILIM) 7-Bit Programmable Overload Currents (ICUT) Fast Shutdown 14.5-Bit Port Current/Voltage Monitoring 2-Event Classification Very High Reliability 4-Point PD Detection 2-Point Forced Voltage 2-Point Forced Current High Capacitance Legacy Device Detection LTC4259A-1 and LTC4266 SW Compatible 1MHz I2C Compatible Serial Control Interface Midspan Backoff Timer Supports Proprietary Power Levels Above 25W Available in 38-Pin 5mm × 7mm QFN Package

4-Port IEEE 802.3bt PoE PSE Controller Features: Four PSE Ports Two Power Channels per Port Low Power Path Dissipation per Channel 150mΩ Sense Resistance 30mΩ or Lower MOSFET RDS(ON) Chipset Provides Electrical Isolation Eliminates Optos and Isolated 3.3V Supply Very High Reliability Multipoint PD Detection Connection Check Distinguishes Single-Signature and Dual-Signature PDs Fully Compliant IEEE 802.3bt Type 3 and 4 PSE Compliant Support for Type 1, 2, 3, and 4 PDs Continuous, Dedicated Per-Port Power and Current Monitoring Per-Port Power Policing 1MHz I2C Compatible Serial Control Interface Pin or I2C Programmable PD Power Up to 71.3W Available in a 40-Lead 6mm × 6mm (LTC4292) and 24-Lead 4mm × 4mm (LTC4291-1) QFN Packages