Features

• IO-Link® PHY Compatible (COM1/COM2/COM3)
• Cable Interface Protected to ±60V
• Operation from 7.5V to 40V
• Integrated Step-Down Switching Regulator
• Max Load Current: 100mA (LT3669)/300mA (LT3669-2)
• Synchronizable and Adjustable Switching Frequency: 250kHz to 2.2MHz
• Output Voltage: 0.8V to 16V
• Integrated 150mA 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 4mm × 5mm QFN Package

Typical Application

Description

The LT®3669 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 250mA of current each or 500mA when connected together, with a minimal residual voltage of less than 2.1V. 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 ±60V in the line interface pins allows the use of standard TVS diodes with L+ operating voltages up to 40V.

The switching regulator integrates the catch diode in LT3669 (up to 100mA load current) and requires an external catch diode in LT3669-2 (up to 300mA load current).

The LT3669 implements an IO-Link device PHY. For IO-Link master designs, see the LTC2874.