5 4 3 2 1 D D VIN 5.5V - 42V VEMI 5.5V - 42V GND E10 L2 0 2010 FB1 E1 C11 1µF 50V 0805 E2 C12 0.1µF 50V C3 4.7µF 50V 1206 C10 4.7µF 50V 1206 C1 22µF + 63V SUNCON 63CE22BS C2 4.7µF 50V 1206 C13 0.1µF 50V U1 LT8609EMSE R1 1.00M 9 VIN BST 1 C4 0.22µF R6 (Opt) SYNC 5 E5 VCC 3 JP1 VCC 1 2 3 4 5 6 7 8 SYNC SPREAD SPECTRUM C7 1µF 7 4 PULSE SKIPPING R2 18.2k (2MHz) BURST EN/UV SW 2 SYNC VCC PG TR/SS RT FB R3 8 49.9k 6 R5 187k VOUT 5V / 2A VOUT XFL4020-222MEC GND C 10 E6 C9 E3 4.7µF 16V 0805 C6 47µF 10V 1210 R4 C GND E4 1.00M C5 10pF 11 EN/UV L1 2.2µH PG E8 TR/SS B GND E7 C8 0.01µF B E9 NOTES: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTORS ARE 0603. ALL CAPACITORS ARE 0603. CUSTOMER NOTICE LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. A TECHNOLOGY TITLE: SCHEMATIC SIZE THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 4 3 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only N/A DATE: 2 2MHz, 2A MICROPOWER SYNCHRONOUS MONOLITHIC STEP-DOWN REGULATOR IC NO. REV. LT8609EMSE 2 DEMO CIRCUIT 2195A SHEET Thursday, February 05, 2015 1 1 OF 1 A