5 4 3 2 1 REVISION HISTORY ECO REV __ DESCRIPTION 2 PRODUCTION APPROVED DATE TOM G. 11-29-12 D D U1 LTC3621EDCB-2 2 VIN E1 1 VIN 2.7V - 17V C1 10uF + ON SW R1 100k OPT BM (Burst Mode) RUN 3 3 PS (Pulse-Skip) JP2 CFF 22pF 6 R2 100k OPT C2 22uF GND 4 C INTVCC MODE/SYNC R3 619k R4 309k R5 196k JP3 JP4 JP5 1.2V 1.8V 2.5V R6 137k R7 84.5k R8 OPT JP6 JP7 JP8 3.3V 5.0V USER SELECT GND 7 GND B E3 E6 SYNC 1A C3 22uF E4 B VOUT RUN C4 1uF 2 MODE/SYNC (Forced Continuous) E2 2 5 E7 1 INTVCC VOUT 2.2uH Rset 619k FB C L1 1 JP1 OFF 3 C1A 8.2uF 25V VIN GND E5 CUSTOMER NOTICE LINEAR TOM G.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 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 4 3 APPROVALS PCB DES. TECHNOLOGY HZ APP ENG. TOM G. TITLE: SCHEMATIC 17V VIN SYNCHRONOUS STEP-DOWN REGULATOR WITH ULTRA-LOW QUIESCENT CURRENT SIZE IC NO. N/A SCALE = NONE 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only REV. LTC3621EDCB-2 DEMO CIRCUIT 1864A 2 Friday, November 22, 2013 DATE: 2 SHEET 1 1 OF 1 A