Features

• IO-Link® Compatible (COM1/COM2/COM3)
• 8V to 34V Operation
• Hot Swap™ Controller Protected Supply Outputs
• Discrete Power MOSFETs for Ruggedness and Flexibility
• Configurable 100mA (4-Port), 200mA (2-Port), or 400mA (1-Port) CQ Drive Capability
• Automatic Wake-Up Pulse Generation
• Automatic Cable Sensing
• CQ Pins Protected to ±50V
• Configurable L+ Current Limit with Foldback
• Short Circuit, Input UV/OV and Thermal Protection
• Optional Interrupt and Auto-Retry after Faults
• 2.9V to 5.5V Logic Supply for Flexible Digital Interface
• No Damage or Latchup to ±8kV HBM ESD
• 38-Lead (5mm × 7mm) QFN and TSSOP Packages

Typical Application

Description

The LTC®2874 provides a rugged, 4-port IO-Link power and communications interface to remote devices connected by cables up to 20m in length.

Output supply voltage and inrush current are ramped up in a controlled manner using external N-channel MOSFETs, providing improved robustness compared to fully integrated solutions.

Wake-up pulse generation, line noise suppression, connection sensing and automatic restart after fault conditions are supported, along with signaling at 4.8kb/s, 38.4kb/s, and 230.4kb/s.

Configuration and fault reporting are exchanged using a SPI-compatible 4-wire interface that operates at clock rates up to 20MHz.

The LTC2874 implements an IO-Link master PHY. For IO-Link device designs, see the LT®3669.