A B C D ECO REV VOUT+ E REVISION HISTORY DESCRIPTION APPROVED 1 1st PROTOTYPE ZHONGMING Y. 2 PRODUCTION ZHONGMING Y. 3 L1 (2.2µH to 3.3µH) ZHONGMING Y. DATE Aug. 12, 2011 June 08, 2012 September 04, 2012 4 4 C14 (OPT) R3 102k 1% 1 2 3 30 31 C6 18nF C5 120pF 3 R5 10.5k 1% 32 R4 15.8k 1% 33 C7 0.33µF 34 R6 27.4k 1% E6 SYNC NC NC NC 35 100k 1% JP2 EN/UVLO FBX VIN 2 INTVCC PGOOD VIN 2 2V-10V VIN E1 L1 E9 + E2 C4 68µF 16V C2 22µF 16V 1210 (OPT) 3.3µH DR74-3R3-R 13 14 R1 332k 1% C13 (OPT) SGND SGND SGND GNDK SW SW SW SW SW GND GND GND GND GND RUN E5 ENABLE 27 E8 SGND 36 C8 4.7µF 10V 3 37 24 4 12 28 38 21 20 * 0.5A 1.0A 2.0A SW 8 9 R2 200k 1% VIN SW E10 PGOOD 3 25 SYNC DRIVE 3 OFF 6 10 23 SS RT SHDN 2 VC 1 ON 1 NC NC NC VIN R7 JP1 U1 LT3959EUHE VOUT+ D1 DFLS230LH C9 22µF 16V 1210 17 16 15 C10 22µF 16V 1210 C11 22µF 16V 1210 Vin Vin Vin E4 C12 22µF 16V 1210 2.0V 5.0V 9.0V VOUT 12V * E3 GND 2 C1 22µF 16V 1210 GND E7 CUSTOMER NOTICE 1 NOTE: UNLESS OTHERWISE SPECIFIED. 1. ALL RESISTORS 0603. 2. ALL CAPACITORS 0603. LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. RB VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APP ENG. ZHONGMING Y. APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. B C TECHNOLOGY LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY 1 WIDE INPUT VOLTAGE RANGE BOOST CONVERTER IC NO. N/A SCALE = NONE 1630 McCarthy Blvd. Milpitas, CA 95035 www.linear.com Phone: (408)432-1900 Fax: (408)434-0507 TITLE: SCHEMATIC SIZE C:\PADS PROJECTS\1853A\SCH\1853A_REV3.DSN THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. A APPROVALS MODIFY DATE: September 04, 2012 D REV. LT3959EUHE DEMO CIRCUIT 1853A 3 SHEET E 1 OF 1