IEEE 802.3af PD Power over Ethernet Interface Controller Features: Complete Power Interface Port for IEEE 802.3af® Powered Devices (PDs) Onboard 100V, 400mA Power MOSFET Precision Input Current Limit Onboard 25k Signature Resistor Programmable Classification Current (Class 0-4) Undervoltage Lockout Smart Thermal Protection Power Good Signal Available in 8-Pin SO and Low Profile (3mm × 3mm) DFN Packages

Quad IEEE 802.3af Power over Ethernet Controller with Integrated Detection 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 DC Sensing Power Good Indication Operates Autonomously or by I2C™ Control 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

Positive High Voltage Hot Swap Controller with I2C Compatible Monitoring Features: Allows Safe Insertion into Live Backplane 8-Bit ADC Monitors Current and Voltage I2C™/SMBus Interface Wide Operating Voltage Range: 8.5V to 80V High Side Drive for External N-Channel MOSFET Input Overvoltage/Undervoltage Protection Optional Latchoff or Autoretry After Faults Alerts Host After Faults Foldback Current Limiting Available in 24-Lead SO, 24-Lead Narrow SSOP and 32-Lead (5mm × 5mm) QFN Packages

Positive High Voltage Hot Swap Controller with I2C Compatible Monitoring Features: Allows Safe Insertion into Live Backplane 8-Bit ADC Monitors Current and Voltage I2C™/SMBus Interface Wide Operating Voltage Range: 8.5V to 80V High Side Drive for External N-Channel MOSFET Input Overvoltage/Undervoltage Protection Optional Latchoff or Autoretry After Faults Alerts Host After Faults Foldback Current Limiting Available in 24-Lead SO, 24-Lead Narrow SSOP and 32-Lead (5mm × 5mm) QFN Packages

Negative Voltage Hot Swap Controllers with ADC and IC Monitoring Features:Allows Safe Insertion into Live –48V Backplanes10-Bit ADC Monitors Current and VoltagesI2C/SMBus Interface or Single-Wire Broadcast ModeFloating Topology Allows Very High Voltage OperationIndependently Adjustable Inrush and Overcurrent LimitsControlled Soft-Start InrushAdjustable UV/OV Thresholds and HysteresisSequenced Power Good Outputs with DelaysAdjustable Power Good Input TimeoutProgrammable Latchoff or Auto-Retry After FaultsAlerts Host After FaultsAvailable in 28-Lead Narrow SSOP and 24-Lead (4mm × 5mm) QFN Packages

Negative Voltage Hot Swap Controllers with ADC and IC Monitoring Features:Allows Safe Insertion into Live –48V Backplanes10-Bit ADC Monitors Current and VoltagesI2C/SMBus Interface or Single-Wire Broadcast ModeFloating Topology Allows Very High Voltage OperationIndependently Adjustable Inrush and Overcurrent LimitsControlled Soft-Start InrushAdjustable UV/OV Thresholds and HysteresisSequenced Power Good Outputs with DelaysAdjustable Power Good Input TimeoutProgrammable Latchoff or Auto-Retry After FaultsAlerts Host After FaultsAvailable in 28-Lead Narrow SSOP and 24-Lead (4mm × 5mm) QFN Packages

Negative Voltage Hot Swap Controllers with ADC and IC Monitoring Features:Allows Safe Insertion into Live –48V Backplanes10-Bit ADC Monitors Current and VoltagesI2C/SMBus Interface or Single-Wire Broadcast ModeFloating Topology Allows Very High Voltage OperationIndependently Adjustable Inrush and Overcurrent LimitsControlled Soft-Start InrushAdjustable UV/OV Thresholds and HysteresisSequenced Power Good Outputs with DelaysAdjustable Power Good Input TimeoutProgrammable Latchoff or Auto-Retry After FaultsAlerts Host After FaultsAvailable in 28-Lead Narrow SSOP and 24-Lead (4mm × 5mm) QFN Packages

Negative Voltage Hot Swap Controllers with ADC and IC Monitoring Features:Allows Safe Insertion into Live –48V Backplanes10-Bit ADC Monitors Current and VoltagesI2C/SMBus Interface or Single-Wire Broadcast ModeFloating Topology Allows Very High Voltage OperationIndependently Adjustable Inrush and Overcurrent LimitsControlled Soft-Start InrushAdjustable UV/OV Thresholds and HysteresisSequenced Power Good Outputs with DelaysAdjustable Power Good Input TimeoutProgrammable Latchoff or Auto-Retry After FaultsAlerts Host After FaultsAvailable in 28-Lead Narrow SSOP and 24-Lead (4mm × 5mm) QFN Packages

High Power Single PSE Controller with Internal Switch Features: 30W PSE Output Power IEEE 802.3af® Compatible Operation from a Single 56V Supply Fully Autonomous Operation Without a Microcontroller Internal MOSFET with Thermal Protection Precision Inrush Control with Internal Sense Resistor Forced Current PD Detection for Noise Immunity AC and DC Disconnect Sensing Legacy PD Detection Robust Short-Circuit Protection Pin-Selectable Detection Backoff for Midspan PSEs LED Driver Indicates Port On and Blinks Status Codes Available in a Miniature14-Pin 4mm × 3mm DFN Package

High Power PD Interface Controller with 750mA Current Limit Features:Complete High Power PD Interface ControllerIEEE 802.3af® CompliantOnboard 750mA Power MOSFETComplementary Power Good OutputsFlexible Auxiliary Power OptionsPrecision Dual Current Limit with DisableProgrammable Classication Current to 75mAOnboard 25k Signature Resistor with DisableUndervoltage LockoutComplete Thermal Overload ProtectionAvailable in Low Prole (4mm × 3mm) DFN Package

IEEE 802.3 at High Power PD Interface Controller with 2-Event Classification Recognition Features:IEEE 802.3af/at Powered Device (PD) ControllerIEEE 802.3at 2-event Classification SignalingProgrammable Classification CurrentFlexible Auxiliary Power Support Using SHDN PinRugged 100V Onboard MOSFET with 100mA Inrush Current Limit.Complementary Power Good OutputsOnboard Signature ResistorComprehensive Thermal ProtectionUndervoltage and Overvoltage Lockout12-Lead, 4mm × 3mm DFN Package

Power over Ethernet IEEE 802.3af PD Interface with Integrated Switching Regulator Features: Complete Power Interface Port for IEEE 802®.3af Powered Device (PD) On-board 100V, UVLO Switch Precision Dual Level Inrush Current Limit Integrated Current Mode Switching Regulator On-board 25k Signature Resistor with Disable Programmable Classication Current (Class 0-4) Thermal Overload Protection Power Good Signal Integrated Error Amplier and Voltage Reference Low Profile 16-Pin SSOP Package

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

IEEE 802.3at High Power PD and Synchronous Forward Controller with AUX Support Features: 25.5W IEEE 802.3at Compliant (Type-2) PD PoE+ 2-Event Classification IEEE 802.3at High Power Available Indicator Integrated State-of-the-Art Synchronous Forward Controller – Isolated Power Supply Efficiency >94% Flexible Auxiliary Power Interface Superior EMI Performance Robust 100V 0.7Ω (Typ) Integrated Hot Swap™ MOSFET Integrated Signature Resistor, Programmable Class Current, UVLO, OVLO and Thermal Protection Short-Circuit Protection with Auto-Restart Programmable Switching Frequency from 100kHz to 500kHz Thermally Enhanced 7mm × 4mm DFN Package

IEEE 802.3at High Power PD and Synchronous Forward Controller with AUX Support Features: 25.5W IEEE 802.3at Compliant (Type-2) PD PoE+ 2-Event Classification IEEE 802.3at High Power Available Indicator Integrated State-of-the-Art Synchronous Forward Controller – Isolated Power Supply Efficiency >94% Flexible Auxiliary Power Interface Superior EMI Performance Robust 100V 0.7Ω (Typ) Integrated Hot Swap™ MOSFET Integrated Signature Resistor, Programmable Class Current, UVLO, OVLO and Thermal Protection Short-Circuit Protection with Auto-Restart Programmable Switching Frequency from 100kHz to 500kHz Thermally Enhanced 7mm × 4mm DFN Package

Hot Swap Controller with I2C Compatible Monitoring Features: Allows Safe Board Insertion Into Live Backplane 12-/16-Bit ADC with ±0.7% Total Unadjusted Error Monitors Current, Voltage, Power and Energy Internal EEPROM for Nonvolatile Configuration Wide Operating Voltage Range: 2.9V to 33V I2C/SMBus Digital Interface (Coexists with PMBus Devices) 12V Gate Drive for Lower MOSFET RDS(ON) Programmable Current Limit with 2% Accuracy MOSFET Power Limiting with Current Foldback Continuously Monitors MOSFET Health Stores Minimum and Maximum Measurements Alerts When Alarm Thresholds Exceeded Reboots on I2C Command Input Overvoltage and Undervoltage Protection Three General Purpose Input/Outputs Internal ±5% or External Timebases 28-Pin 4mm × 5mm QFN Package AEC-Q100 Qualified for Automotive Applications

Negative Voltage Hot Swap Controller with Energy Monitor Features: Allows Safe Insertion into Live –48V Backplanes Protects MOSFET with SOA Timer Programmable 15mV to 30mV Current Limit Sense Voltage with 8-Bit to 16-Bit Gear-Shift ADC with 0.7% Accuracy Monitors Voltages, Currents, Power and Energy Nonvolatile Configuration and Fault Recording Floating Topology for Rugged High Voltage Operation Selectable Inrush Control: dV/dt or Current Limit I2C/SMBus or Single-Wire Broadcast Interfaces Min/Max ADC Measurement Logging with Alerts Reboots on I2C Command with Programmable Delay Adjustable Input UV/OV Thresholds and Hysteresis 38-Pin 5mm × 7mm QFN Package

High Power Negative Voltage Hot Swap Controller with Energy Monitor Features: Drives Two Gates for High Power Applications Configurable Parallel, Staged Start or Single Modes Protects MOSFET with SOA Timer Programmable 15mV to 30mV Current Limit Sense Voltage with 8-Bit to 16-Bit Gear-Shift ADC with 0.7% Accuracy Monitors Voltages, Currents, Power and Energy Nonvolatile Configuration and Fault Recording Floating Topology for Rugged High Voltage Operation Selectable Inrush Control: dV/dt or Current Limit I2C/SMBus or Single-Wire Broadcast Interfaces Min/Max ADC Measurement Logging with Alerts Reboots on I2C Command with Programmable Delay Adjustable Input UV/OV Thresholds and Hysteresis 44-Pin 5mm × 8mm QFN Package

8-Port PoE/PoE+/LTPoE++ PSE Analog Controller Features: Eight Independent PSE Channels Compliant with IEEE 802.3at Type 1 and 2 Chipset Provides Electrical Isolation Reduced BOM Cost Eliminates up to 6 High Speed Opto-Couplers Eliminates Isolated 3.3V Power Supply Low Power Dissipation 0.25Ω Sense Resistance Per Channel Very High Reliability 4-Point PD Detection 2-Point Forced Voltage 2-Point Forced Current VEE and VPORT Monitoring 1 Second Rolling IPORT Averaging Supports 2-Pair and 4-Pair Output Power 1MHz I2C Compatible Serial Control Interface Available In Three Power Grades A-Grade – LTPoE++™ 38.7W to 90W B-Grade – PoE+ 25.5W C-Grade – PoE 13W Available In a 40-Lead 6mm × 6mm (LTC4290) and 24-Lead 4mm × 4mm (LTC4271) QFN Package