5 4 3 2 1 REVISION HISTORY ECO REV 1 DESCRIPTION 2 APPROVED PRODUCTION JIAN L. DATE 11-16-09 1 VIN R1 (OPT) 2 D RUN/SS D2 BAS16HT1 (OPT) SOD-323 D E1 R11 (OPT) VIN 2 15K 2200pF 2 C 1 11 C12 R5 (OPT) 20K C6 1nF 12 7 ITH FB VIN SENSE- INTVCC SENSE+ BG GND (OPT) 5 4 R3 5 6 7 C4 0.1uF 16V 0 C L1 4 10 9 8 1 TG R4 2 VIN 2.2uH RS1 0.005 TDK RLF7030T D1 CMDSH-3 8 R9 10 BG C8 0.1uF 50V R7 (OPT) C10 4.7uF 16V R13 10 VOUT 2.5V/5A E8 COUT1 + COUT2 220uF 47uF 6.3V 4V R8 (OPT) 13 R10 42.2K BOOST GND R6 C11 (OPT) Q1 Si4816BDY TG C3 GND E4 3 R2 CIN3 18uF 35V SW 2 150pF 6 RUN/SS 1 C2 SW + 2 3 LTC3854EDDB 3 E3 CIN1 4.7uF 50V U1 C1 0.1uF OFF VIN 4.5V - 26V VIN 1 JP1 RUN ON GND E9 R12 0 B B VIN CIN2 (OPT) TG 4 5 3 6 FDS6982AS (OPT) SW A Q2B BG 2 7 Q2A 1 8 FDS6982AS 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. 5 4 3 APPROVALS PCB DES. APP ENG. HZ JIAN L. 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 HIGH EFFICIENCF STEP-DOWN DC-DC CONVERTER SIZE N/A SCALE = NONE 2 IC NO. REV. LTC3854EDDB 2 DEMO CIRCUIT 1450A DATE: Monday, February 22, 2010 SHEET 1 1 OF 1 A