5 4 3 2 ECO REVISION HISTORY REV 1 DESCRIPTION 1 APPROVED PRODUCTION Charlie Z. DATE 7-9-13 D D U1 LTC3630AEDHC E1 VIN VIN 4V - 76V C1 220nF 100V 0805 R5 4.7 0805 R2 OPT ON D1 OPT GND C2 4.7uF 100V 2220 R1 OPT 1 3 L1 VIN SW VFB 68uH SUMIDA CDRH105 B A 2 5 3 RUN VPRG1 E4 1 VOUT C9 1.8V/3.3V/5V 0.1uF 500mA GND E3 GND VOUT JP2 C E6 2 C10 OPT 1210 10 C11 OPT 1210 C4 47nF GND GND 15 NC NC NC NC 1 2 6 C8 OPT 1210 17 2 C3 4 220pF 13 GND R4 220k SS 8 OPT ISET 14 11 VIN GND E5 FBO 16 R3 VPRG2 JP1 C7 100uF 10V 1210 R7 OPT B A 3 12 C6 100uF 10V 1210 2 2 7 3 FBO C5 OPT R6 0 9 JP3 OFF C E2 VOUT 1 B B NOTE: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTORS AND CAPACITORS ARE 0603. 2 VOUT JP1 JP2 1.8V B B 3.3V A B 5.0V B A EXT. R A A A CUSTOMER NOTICE APPROVALS LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APP ENG. APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 4 3 TECHNOLOGY HZ 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only Charlie Z. TITLE: SCHEMATIC SCALE = NONE A HIGH EFFICIENCY, 76V, 500mA SYNCHRONOUS STEP-DOWN CONVERTER SIZE IC NO. REV. LTC3630AEDHC 1 N/A DEMO CIRCUIT 1877A DATE: Monday, July 15, 2013 2 SHEET 1 1 OF 1