1 REVISION HISTORY ECO REV DESCRIPTION APPROVED 2 PRODUCTION FAB J. DREW DATE 06-15-10 E3 E1 VIN 2.7V - 5.5V * VOUT C3 0.1uF 16V C2 10uF 6.3V 0805 1 5.3V / 4.5V JP1 2 4.8V / 4.0V 3 ON L2 3.3uH L1 PFI 3 CTL 4 VSEL PROG 6 12 SW1 1 VMID 10 PGOOD 9 PFO 8 EN 2 A C7-1 10F OPT + C7-2 25F OPT E4 VMID 3.3uH V+ 3 BAL GND 13 R3 OPT 3 OFF JP2 11 VOUT SW2 7 5 ENABLE 1 VSEL 2 VIN + 2 * U1 R2 100K R1 1 C5 22uF 6.3V 20% 0805 1 C1 10uF 6.3V 0805 C4 0.1uF 16V R4 71.5k C9 HS230F 1.2F 39mm x 17mm 5.5V + C6 22uF 6.3V 20% 0805 C8-1 10F OPT + C8-2 25F OPT A E2 E5 GND GND E6 GND R5 1M E7 V PULL-UP R6 1M E8 PGOOD E9 PFO CUSTOMER NOTICE * ASSY TYPE U1 VOUT -A LTC3625EDE 5.3V - 4.8V -B LTC3625EDE-1 4.5V - 4.0V Unless noted: Resistors: Ohms, 0402, 1%, 1/16W Capacitors: uF, 0402, 6.3V 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. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 1 APPROVALS PCB DES. NC APP ENG. J. DREW SCALE = NONE TECHNOLOGY 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only TITLE: SCHEMATIC 1A HIGH EFFICIENCY 2-CELL SUPERCAPACITOR CHARGER WITH AUTOMATIC CELL BALANCING SIZE IC NO. LTC3625EDE / LTC3625EDE-1 REV. N/A 2 DEMO CIRCUIT 1583A-A/B DATE: Monday, August 23, 2010 SHEET 1 OF 1