5 4 8 TXEN2 E18 TXEN2-J GND 1 2 3 4 5 6 5V 7 TXD1 E19 TXD1-J E20 TXD2-J R16 1K GND 1 2 3 4 5 6 D 2 3 4 5 6 5V 7 8 JP10 TXD1 5 7 R26 1K 6 8 PAR OPEN 1 3 JP5 TXD1-2 JP11 TXD2 LDO TXD1 FB_LDO TXD2 LDO_IN 5V SC2 SW R9 10K R25 100K 4 E1 SC1 E2 SC1 1 SC2 2 28 C1 C5 100nF R13 0 TXEN1-J FB_OUT EXPOSED SC2 PAD 1 RST RT CPOR L+ ILIM Q2 ILIM GND RES 5V RXD1 18 17 C8 16 15 CQ1 SR R23 10.2K 38.3K SYNC EN/UVLO 15 3 3 OPEN DC1733A-A DC1733A-B LT3669EUFD LT3669EUFD-2 4 C6 470pF 50V S1 5 S2 M12-MALE-5PIN 10 J2 L+ 2 JP7 EN/UVLO D1 D2 4 CQ1 CON-OSTTV041150 R18 100K SMCJ36A D4 SMCJ36A R28 EN/UVLO E16 1K 1. ALL RESISTORS ARE 0402 ALL CAPACITORS ARE 0402. I BUCK C8 0.1A 0.1A 10uF C9 0.1uF 0.15A 0.3A 22uF 0.22uF D6 1630 McCarthy Blvd. Milpitas, CA 95035 OPEN DFLS160 LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A Phone: (408)432-1900 www.linear.com CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; TECHNOLOGY Fax: (408)434-0507 HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO LTC Confidential-For Customer Use Only VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL TITLE: SCHEMATIC APPLICATION. COMPONENT SUBSTITUTION AND PRINTED INDUSTRIAL TRANSCEIVER WITH INTEGRATED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR STEP-DOWN REGULATOR AND LDO TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. L1 82uH, CDRH4D22HPNP-820MC 33uH, CDRH50D28RNP-330MC SIZE THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 D3 CUSTOMER NOTICE I LDO 3 2 R17 1M 1 12 B L+ Q2 L-/GND 1 NOTE: UNLESS OTHERWISE SPECIFIED HEADER 2X8 2MM * E10 2 SYNC 16 E12 1 AGND GND 29 5V 14 E11 CQ1 50V 1206 C12 4.7uF JP3 CQ1-2 C14 OPT R14 100K 3.3V E9 L-/GND J1 C11 470pF 50V 13 VERSION TABEL ASSY TYPE U1 D5 OPT 23 RST 12 A GND L+ 7.5V - 40V Q2 C10 OPT 1206 R24 9 C E21 11 3 11 24 E4 SC1 10 SYNC SYNC E15 GND 13 22 * GND E8 8 SC2 V BUCK 5V / I BUCK E6 R22 53.6K RES 9 5V 21 SR 25 JP4 L1 * PAR 2 E14 C16 0.1uF 6.3V 0603 * * GND LDOIN 6.3V 0805 * C9 * 14 WAKE 7 DIO 2 C13 0.1uF VOUT 6.3V 0603 1 GND 6 R20 4.42K 20 5V JP2 1 TXD1-J 26 3 R12 42.2K 2 27 10pF JP1 J3 TXEN2-J DA SC1 DIO RST TXD2-J RXD1 5V R11 100K E3 19 3.3V / I LDO E5 C15 0.1uF 6.3V 0603 C7 1uF 6.3V 0603 D6 RXD1 RST 5 TXEN2 BST E13 4 TXEN1 5V R10 100K 3 * BD RXD1 B V LDO R19 14K R27 1K 5V 2 3.3V WAKE C 1 R21 10K E7 U1 8 GND 1 5V WAKE 8 5V 7 TXD2 PAR OPEN 1 3 JP6 TXEN1-2 JP9 TXEN2 3 5V 7 D R15 1K 1 6 3 4 5 2 3 3 TXEN1-J 1 JP8 TXEN1 WAKE E17 2 2 2 TXEN1 GND 1 2 5V 3 4 3 2 N/A DATE: IC NO. REV. LT3669EUFD/LT3669EUFD-2 DEMO CIRCUIT 1733A Tuesday, May 06, 2014 SHEET 1 3 1 OF 1 A