5 4 3 2 1 1 VIN R1 (OPT) 2 D RUN/SS D2 BAS16HT1 (OPT) SOD-323 VIN+ E2 D E1 E3 CIN1 10uF 16V 1 JP1 RUN ON C1 0.1uF 5 U1 LTC3854EDDB Q1 RJK0305DPB 4 3 OFF 3 RUN/SS Q2 (OPT) CIN2 (OPT) CIN4 (OPT) CIN5 10uF 16V + CIN3 180uF 16V CIN6 (OPT) CIN7 (OPT) 5 2 VIN 4.5V - 14V VIN R11 (OPT) GND E4 4 E6 VIN- 11 SENSE- R6 C5 (OPT) R10 17.4K (OPT) INTVCC 9 VIN INTVCC D1 CMDSH-3 RS1 0.002 FDA1055 TOKO Q4 (OPT) COUT1 100uF 6.3V BG 8 7 GND 4 C8 0.1uF 16V COUT2 + COUT3 + COUT4 + COUT5 + 330uF (OPT) 330uF 100uF 2.5V 4V 6.3V 2.5V C GND E9 4 R7 (OPT) Q3 RJK0330DPB C10 4.7uF 16V VOUT 1.5V@15A E8 COUT6 (OPT) 4V 2 12 SENSE+ 13 GND C6 1nF R4 2 0.56uH R13 47 R9 47 VOUT- E10 1 2 3 R5 20K VIN 10 L1 5 1 FB C R3 0 VOUT+ E7 C4 0.1uF 16V 5 BOOST 4 1 2 3 TG 5 C3 2 ITH 2200pF 1 2 3 5.62K 1 R2 47pF 1 2 3 SW 6 C2 R8 (OPT) NOTE: ONLY APPLY LOAD FROM E8 TO E9 R12 0 B B CUSTOMER NOTICE A 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. 5 4 3 CONTRACT NO. APPROVALS DRAWN DATE HELEN 5/20/08 Mike S. 5/204/08 TECHNOLOGY TITLE APPROVED DESIGNER Monday, April 06, 2009 2 SIZE A LTC3854EDDB High Efficiency, Small Footprint Step-Down DC-DC Converter CHECKED ENGINEER 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 CAGE CODE SCALE: FILENAME: DWG NO REV A DC1271A SHEET 1 1 OF 1