1 Rbm1 BM (BURST MODE) 5 6 SYNC 7 8 PS (PULSE-SKIP) U1 MODE /SYNC VIN 4V - 10V E1 Cin1 * 6.8uF 20V A GND E2 1 PVIN 2 PVIN Cin 22uF 25V Cin2 0.1uF 16V (OPT) Rpg 100K INTVcc 3 BOOST 20 4 SYNC/MODE Css 0.1uF EXT SS 1 INT SS 3 TRACK 5 JP7 L1 2.2uH IHLP-2525CZ-01 VISHAY Cffw 10pF Rfb5 105K 1% Rset 105K Rfb1 2 Rfb2 4 6 TRACK TRACK Rfb3 Rtr1 E8 Cout1 0.1uF Cout 100uF 6.3V E3 E4 21 PGND GND 9 15 PGND PGND 14 Cc 1000pF PGND Rc 4.32K RT Cc1 (OPT) 13 3 Rsd 4.7M 12 OFF A D1 (OPT) VFB 8 6 1 7 ITH JP5 2 PGOOD Cst 1uF CBst 0.22uF SW 17 SW 16 11 TRACK/SS ON DBst SW 19 SW 18 10 RUN VOUT ENABLE E7 LTC3602EUF 2 FC (FORCED CONTINUOUS) 4 1 E6 2 3 1 Cbm 0.1uF 10V (OPT) JP6 2 1 GND 845K PGOOD 5 Rbm2 137K SYNC 2 255K Rfb4 332K 1% GND GND JP1 2.5V 475K 1% JP2 768K 1% JP3 (OPT) JP4 Rtr2 200K E5 VOUT 2.5A(max) 3.3V 5V OPT B B * CIN1 IS AN OPTIONAL CAPACITOR. IT IS INSERTED ON THE DC1015A TO DAMPEN THE (POSSIBLE) RINGING VOLTAGE DUE TO THE LONG INPUT LEADS. ON A NORMAL, TYPICAL PCB, WITH SHORT TRACE, THE CAPACITOR IS NOT NEEDED, 1 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. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. CONTRACT NO. APPROVALS DRAWN HELEN DATE 1/28/08 CHECKED APPROVED ENGINEER Tom Gross 1/28/08 DESIGNER Monday, April 14, 2008 TECHNOLOGY TITLE 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 LTC3602EUF High Input Voltage 2.5A Monolithic Synchronous Buck Regulator SIZE CAGE CODE SCALE: FILENAME: 2 DWG NO REV A DC1015A SHEET 1 OF 1