LT3669/LT3669-2 IO-Link Transceiver with Integrated Step-Down Regulator and LDO FEATURES DESCRIPTION n IO-Link PHY Compatible (COM1/COM2/COM3) The LT 3669 is an industrial transceiver that includes a n Cable Interface Protected to 60V step-down switching regulator and a low dropout linear n Operation from 7.5V to 40V regulator. Wake-up detect functionality, as well as a pro- n Integrated Step-Down Switching Regulator grammable power-on reset timer are also included. The n Max Load Current: 100mA (LT3669)/ current limit and slew rate of the transmitters are externally 300mA (LT3669-2) adjustable for optimum EMC performance. n Synchronizable and Adjustable Switching The line drivers can source/sink up to 250mA of current Frequency: 250kHz to 2.2MHz each or 500mA when connected together, with a minimal n Output Voltage: 0.8V to 16V residual voltage of less than 2.1V. An internal adaptive n Integrated 150mA LDO Linear Regulator pulsing scheme allows the drivers to safely switch heavy n Rugged Line Drivers with Adjustable Slew Rate and capacitive loads and incandescent bulbs. Thermal shut- Current Limit down provides additional protection. Line protection of n Adaptive Line Driver Pulsing Scheme to Switch 60V in the line interface pins allows the use of standard Heavy Loads Safely TVS diodes with L+ operating voltages up to 40V. n Drivers Configurable as Push-Pull, Pull-Up or The switching regulator integrates the catch diode in Pull-Down n LT3669 (up to 100mA load current) and requires an exter- Adjustable Power-On Reset Timer n nal catch diode in LT3669-2 (up to 300mA load current). Small 28-Pin Thermally Enhanced 4mm 5mm QFN Package The LT3669 implements an IO-Link device PHY. For IO-Link master designs, see the LTC2874. APPLICATIONS L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot Swap is a trademark of Linear Technology Corporation. IO-Link is a registered trademark of PROFIBUS n Industrial Sensors and Actuators User Organization (PNO). All other trademarks are the property of their respective owners. TYPICAL APPLICATION Operating Waveforms 53.6k 5V LT3669 BD FB 100mA 82H OUT TXD1 LDO 0.1F 10.2k 10F IN 5V/DIV SW 0V CPOR RXD1 0.1F t = 12.5ms RST 5V/DIV BST f = 600kHz 38.3k SW 0V SYNC RT SR 42.2k ILIM CQ1 LDO RESET RST 5V/DIV 14k 3.3V FB I/O SC1 LDO 100mA 4.42k I/O SC2 AGND 1F 0V I/O WAKE C 10s/DIV I/O RXD1 DIO V , 7.5V TO 40V L+ I/O TXEN1 EN/UVLO (RXD1 PULL-UP RESISTOR = 10k) 36692 TA01b TRANSIENT TO 60V TXD1 L+ I/O 250mA 1 I/O TXEN2 Q2 250mA 4 I/O TXD2 CQ1 2 GND 470pF 470pF 4.7F 3 36692 TA01a 3669fa 1 For more information www.linear.com/LT3669LT3669/LT3669-2 ABSOLUTE MAXIMUM RATINGS (Notes 1 and 2) L+, EN/UVLO Voltage (Note 3) .................... 60V to 60V FB , FB , SYNC Voltage .......................................6V OUT LDO CQ1, Q2 Voltage .......................................... 60V to 60V CPOR, RT, ILIM Voltage ..............................................3V (L+ to CQ1), (L+ to Q2) Voltage ................... 60V to 60V SR, TXEN1, TXD1, TXEN2, TXD2 Voltage .................30V DIO, LDO Voltage (Note 3) ...................... 0.3V to 60V SC1, SC2, WAKE, RST, RXD1 Voltage .......................30V IN DIO Above L+ Voltage ...............................................90V Operating Junction Temperature BST Voltage ..............................................................50V Range (Notes 4 and 5) BST Above SW Voltage .............................................30V LT3669E ............................................ 40C to 125C BD Voltage ................................................................30V LT3669I ............................................. 40C to 125C LDO Voltage ................................................................8V LT3669H ............................................ 40C to 150C LDO Above LDO Voltage .......................................0.3V Storage Temperature Range .................. 65C to 150C IN PIN CONFIGURATION LT3669 LT3669-2 TOP VIEW TOP VIEW 28 27 26 25 24 23 28 27 26 25 24 23 SC1 1 22 RT SC1 1 22 RT SC2 2 21 FB SC2 2 21 FB OUT OUT WAKE 3 20 FB WAKE 3 20 FB LDO LDO 29 29 RXD1 4 19 LDO RXD1 4 19 LDO GND GND TXEN1 5 18 TXEN1 5 18 LDO LDO IN IN TXD1 6 17 BD TXD1 6 17 BD TXEN2 7 16 BST TXEN2 7 16 BST TXD2 8 15 SW TXD2 8 15 SW 9 10 11 12 13 14 9 10 11 12 13 14 UFD PACKAGE UFD PACKAGE 28-LEAD (4mm 5mm) PLASTIC QFN 28-LEAD (4mm 5mm) PLASTIC QFN = 44C/W, = 8C/W = 44C/W, = 8C/W JA JC JA JC EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB 3669fa 2 For more information www.linear.com/LT3669 Q2 RST CQ1 CPOR L+ ILIM EN/UVLO SR DIO SYNC GND AGND Q2 RST CQ1 CPOR L+ ILIM EN/UVLO SR DIO SYNC DA AGND