5 4 3 2 1 REVISION HISTORY ECO REV __ 2 DESCRIPTION APPROVED PRODUCTION Goran P. DATE 10-16-13 D D L1 7 + C10 10uF 1 ON GND JP1 RUN C1 10uF 10V 2 2 C6 1uF 3 5 C5 120pF 18 SW2 17 SW2 VOUTS R8 12.1k 0.1% MID 15 14 R3 301K 11 E6 C12 10F 13 C3 10uF PGOOD RSENP RSENS PFO PROG MAXV E5 127k E7 JP4 PULL UP SOURCE PGOOD 1 2 VIN VOUT 3 4 5 6 VOUT VPWR APP ENG. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. VPWR 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only APPROVALS PCB DES. PFO B VIN TECHNOLOGY HZ Goran P. TITLE: SCHEMATIC BUCK-BOOST SUPERCAPACITOR CHARGER AND BALANCER SIZE IC NO. N/A 3 C R6 1Meg R7 10 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. 4 GND 8 CUSTOMER NOTICE 5 MID R5 1Meg 12 E10 A VOUT 4.2V / 1A C9 10F + C8 330mF 5.5V + RUN 20 B C11 1uF OPT VIN FB 4 3 E9 VOUTP V+ C2 10uF 3 BAL R1 1.87Meg 16 E3 C4 10uF 10V RSENS VOUTP C7 1uF OFF E4 U1 LTC3128EUFD PFI GND 1.72V - 5.5V C E2 2 9 VIN E1 VIN VOUT 1 VOUT R4 OPT GND VOUT GND 6 21 5 6 VIN 19 4 SW1 3 R2 0 1 PFI SW1 E8 3.3uH 2 1 PFI JP3 MODE SCALE = NONE REV. LTC3128EUFD DEMO CIRCUIT 1887A 2 Tuesday, November 12, 2013 DATE: 2 SHEET 1 1 OF 1 A