The LTC®9101-2/LTC9102 chipset is a 12/24-port power sourcing equipment (PSE) controller designed for use in IEEE 802.3bt Type 3 and 4 compliant Power over Ethernet (PoE) systems. The LTC9101-2/LTC9102 is designed to power compliant 802.3af, 802.3at, and 802.3bt PDs. The LTC9101-2/LTC9102 chipset delivers lowest-in-industry heat dissipation by utilizing low RDS(ON)external MOSFETs and 0.1Ω sense resistance per power channel. A transformer-isolated communication protocol replaces expensive opto-couplers and complex isolated 3.3V supply, resulting in significant BOM cost savings.Advanced power management features include per-port 14‑bit current/voltage monitoring, programmable power limits, and versatile fast shut down of preselected ports. An advanced power management host software layer is available. PD detection uses a proprietary multipoint detection mechanism ensuring excellent immunity from false PD identification. Autoclass and 5-event physical classification are supported. The LTC9101-2/LTC9102 includes an I2C serial interface operable up to 1MHz. The LTC9101-2/LTC9102 is pin or I2C programmable to negotiate PD delivered power up to 71.3W.APPLICATIONSPoE PSE Switches/Routers and Midspans

The LTC9101-2A/LTC9102chipset is a (up to) 48-port power sourcing equipment (PSE) controller designed for use in IEEE 802.3at Type 1 and 2 compliant Power over Ethernet (PoE) systems. The LTC9101-2A/LTC9102 is designed to power compliant 802.3af and 802.3at PDs. The LTC9101-2A/LTC9102 chipset delivers lowest-in-industry heat dissipation using low RDS(ON)external MOSFETs and 0.1Ω sense resistance per power channel. A transformer-isolated communication protocol replaces expensive optocouplers and a complex isolated 3.3V supply, resulting in significant bill of materials (BOM) cost savings.Advanced power management features include per-port 14‑bit current/voltage monitoring, programmable current limits, and versatile fast shutdown of preselected ports. PD detection uses a proprietary multipoint detection mechanism, ensuring excellent immunity from false PD identification. 1-event and 2-event physical classification are supported. The LTC9101-2A/LTC9102 includes an I2C serial interface operable up to 1MHz. The LTC9101-2A/LTC9102 is pin or I2C programmable to negotiate PD-delivered power up to 25.5W.APPLICATIONSPoE PSE Switches/Routers and Midspans

The LTC®9101-2/LTC9102 chipset is a 12/24-port power sourcing equipment (PSE) controller designed for use in IEEE 802.3bt Type 3 and 4 compliant Power over Ethernet (PoE) systems. The LTC9101-2/LTC9102 is designed to power compliant 802.3af, 802.3at, and 802.3bt PDs. The LTC9101-2/LTC9102 chipset delivers lowest-in-industry heat dissipation by utilizing low RDS(ON)external MOSFETs and 0.1Ω sense resistance per power channel. A transformer-isolated communication protocol replaces expensive opto-couplers and a complex isolated 3.3V supply, resulting in significant BOM cost savings.Advanced power management features include per-port 14‑bit current/power monitoring, programmable current/power limits, and versatile fast shut-down of preselected ports. An advanced power management host software layer is available. PD detection uses a proprietary multipoint detection mechanism ensuring excellent immunity from false PD identification. Autoclass and 5-event physical classification are supported. The LTC9101-1/LTC9102 includes an I2C serial interface operable up to 1MHz. The LTC9101-1/LTC9102 is pin or I2C programmable to negotiate PD delivered power up to 71.3W.APPLICATIONSPoE PSE Switches/Routers and Midspans

The LTC9101-1/LTC9102/LTC9103 chipset is a 48-port power sourcing equipment (PSE) controller designed for use in IEEE 802.3at Type 2, 802.3bt Type 3 and 4 compliant Power over Ethernet (PoE) systems. The LTC9101-1/LTC9102/LTC9103 is designed to power compliant 802.3af, 802.3at, and 802.3bt PDs. The LTC9101-1/LTC9102/LTC9103 chipset delivers lowest-in-industry heat dissipation by utilizing low-RDS(ON)external MOSFETs and 0.1Ω sense resistance per power channel. A transformer-isolated communication protocol replaces expensive opto-couplers and complex isolated 3.3V supply, resulting in significant BOM cost savings.Advanced power management features include per-port 14‑bit current/power monitoring, programmable current/power limits, and versatile fast shut-down of preselected ports. An advanced power management host software layer is available. PD detection uses a proprietary multipoint detection mechanism ensuring excellent immunity from false PD identification. Autoclass and 5-event physical classification are supported. The LTC9101-1/LTC9102/LTC9103 includes an I2C serial interface operable up to 1MHz. The LTC9101-1/LTC9102/LTC9103 is pin or I2C programmable to negotiate PD delivered power up to 71.3W.APPLICATIONSPoE PSE Switches/Routers and Midspans

The LTM2881 is a complete galvanically isolated full-duplex RS485/RS422 μModule®(micromodule) transceiver. No external components are required. A single supply powers both sides of the interface through an integrated, isolated, low noise, efficient 5V output DC/DC converter.Coupled inductors and an isolation power transformer provide 2500VRMSof isolation between the line transceiver and the logic interface. This device is ideal for systems where the ground loop is broken allowing for large common mode voltage variation. Uninterrupted communication is guaranteed for common mode transients greater than 30kV/μs.Maximum data rates are 20Mbps or 250kbps in slew limited mode. Transmit data, DI and receive data, RO, are implemented with event driven low jitter processing. The receiver has a one-eighth unit load supporting up to 256 nodes per bus. A logic supply pin allows easy interfacing with different logic levels from 1.62V to 5.5V, independent of the main supply.Enhanced ESD protection allows this part to withstand up to ±15kV (human body model) on the transceiver interface pins to isolated supplies and ±10kV through the isolation barrier to logic supplies without latch-up or damage.ApplicationsIsolated RS485/RS422 InterfaceIndustrial NetworksBreaking RS485 Ground LoopsIsolated PROFIBUS-DP Networks

The LTM2882 is a complete galvanically isolated dual RS232 μModule®(micromodule) transceiver. No external components are required. A single 3.3V or 5V supply powers both sides of the interface through an integrated, isolated DC/DC converter. A logic supply pin allows easy interfacing with different logic levels from 1.62V to 5.5V, independent of the main supply.Coupled inductors and an isolation power transformer provide 2500VRMSof isolation between the line transceiver and the logic interface. This device is ideal for systems with different grounds, allowing for large common mode voltages. Uninterrupted communication is guaranteed for common mode transients greater than 30kV/μs.This part is compatible with the TIA/EIA-232-F standard. Driver outputs are protected from overload and can be shorted to ground or up to ±15V without damage. An auxiliary isolated digital channel is available. This channel allows configuration for half-duplex operation by controlling the DE pin.Enhanced ESD protection allows this part to withstand up to ±10kV (human body model) on the transceiver interface pins to isolated supplies and across the isolation barrier to logic supplies without latch-up or damage.ApplicationsIsolated RS232 InterfaceIndustrial CommunicationTest and Measurement EquipmentBreaking RS232 Ground Loops

The LTM2883 is a complete galvanic 6-channel digital μModule®(micromodule) isolator. No external components are required. A single 3.3V or 5V supply powers both sides of the interface through an integrated, isolated DC/DC converter. A logic supply pin allows easy interfacing with different logic levels from 1.62V to 5.5V, independent of the main supply.Available options are compliant with SPI and I2C (master mode only) specifications.The isolated side includes ±12.5V and 5V nominal power supplies, each capable of providing more than 20mA of load current. Each supply may be adjusted from its nominal value using a single external resistor.Coupled inductors and an isolation power transformer provide 2500VRMSof isolation between the input and output logic interface. This device is ideal for systems where the ground loop is broken, allowing for a large common mode voltage range. Communication is uninterrupted for common mode transients greater than 30kV/μs.ApplicationsIsolated SPI or I2C InterfacesIndustrial SystemsTest and Measurement EquipmentBreaking Ground Loops

The LTM2884 is a complete galvanically isolated USB 2.0 compatible μModule®(micromodule) transceiver. An upstream supply powers both sides of the interface through an integrated, isolated DC/DC converter.The LTM2884 is ideal for isolation in host, hub, bus splitter or peripheral device applications. It is compatible with USB 2.0 full speed (12Mbps) and low speed (1.5Mbps) operation. Automatic speed selection configures integrated pull-up resistors on the upstream port to match those sensed on the downstream device.The isolator μModule technology uses coupled inductors and an isolated power transformer to provide isolation between the upstream and downstream USB interface. This device is ideal for systems requiring isolated ground returns or large common mode voltage variations. Uninterrupted communication is guaranteed for common mode transients greater than 30kV/μs.Enhanced ESD protection allows this part to withstand up to ±15kV (human body model) on the USB transceiver interface pins to local supplies and ±15kV through the isolation barrier to supplies without latch-up or damage.ApplicationsIsolated USB InterfacesHost, Hub, or Device IsolationIndustrial/Medical Data Acquisition