LT®3669 IO-Link Transceivers

LT®3669 IO-Link Transceivers

The LT3669 from Linear Technology is an industrial transceiver that includes a step-down switching regulator and a low-dropout linear regulator. Wake-up detect functionality, as well as a programmable power-on reset timer are also included. The current-limit and slew-rate of the transmitters are externally adjustable for optimum EMC performance. The line drivers can source/sink up to 250 mA of current each or 500 mA when connected together, with a minimal residual voltage of less than 2.1 V.

An internal adaptive pulsing scheme allows the drivers to safely switch heavy-capacitive loads and incandescent bulbs. Thermal shutdown provides additional protection. Line protection of ±60 V in the line interface pins allows the use of standard TVS diodes with L+ operating voltages up to 40 V. The switching regulator integrates the catch diode in LT3669 (up to 100 mA load current) and requires an external catch diode in LT3669-2 (up to 300 mA load current). The LT3669 implements an IO-Link device PHY. For IO-link master designs, see the LTC2874.

  • IO-Link® PHY compatible (COM1 / COM2 / COM3)
  • Cable interface protected to ±60 V
  • Operation from 7.5 V to 40 V
  • Integrated step-down switching regulator
  • Max-load current: 100 mA (LT3669)/300 mA (LT3669-2)
  • Synchronizable and adjustable switching frequency: 250 kHz to 2.2 MHz
  • Output voltage: 0.8 V to 16 V
  • Integrated 150 mA LDO linear regulator
  • Rugged line drivers with adjustable slew rate and current limit
  • Adaptive line driver pulsing scheme to switch heavy-loads safely
  • Drivers configurable as push-pull, pull-up or pull-down
  • Adjustable power-on reset timer
  • Small-28-pin thermally-enhanced 4 mm x 5 mm QFN package


  • Industrial sensors and actuators