5 4 3 2 1 REVISION HISTORY ECO REV DESCRIPTION 3 D GND 1210 C4 470nF 9 E8 12 R16 INTVCC EN/UVLO BST1 BST2 R6 115k 0603 R10 OPT TG1 38 OVLO SW1 R11 54.9k E10 4 OPENLED OPENLED E11 8 IVINMON E12 7 ISMON E13 33 CLKOUT E15 B 34 R14 0 0603 GND VREF R20 OPT E19 GND E21 Css 10nF 2 SW2 TG2 OPENLED FB IVINMON ISP ISMON ISN SYNC PWMOUT SS R12 86.6k 300kHz DATE 1-31-12 C16 (OPT) VIN 4.7V - 60V 0 13 PWM INTVCC E5 C7 4.7uF 10V 0603 D1 BAT46WJ D GND E3 INTVCC D2 BAT46WJ OUT E6 15 RLED 22 M1 RJK0651DPB 14 C8 0.1uF 0402 C6 0.1uF 0402 D4 OPT RJK0451DPB C9 4.7uF 50V 1210 M4 L1 10uH 16 M2 RJK0651DPB 18 C10 4.7uF 50V 1210 C15 4.7uF 50V 1210 C17 (OPT) 0.05 2010 LED+ E14 2A C M3 RJK0451DPB R9 44.2k 27 R21 OPT RS 0.004 2010 28 C13 4.7uF 50V 1210 R7 1M SUMIDA HC9-100-R D3 OPT OPENLED M6 OPT 19 21 24 37 25 C18 OPT 26 CLKOUT RT E20 SHORTLED 35 SYNC BG2 PGND 5 SHORTLED SNSN VREF PGND 6 NC 17 VREF 0402 23 PGND R5 200k 0603 C11 0.1uF SGND INTVCC SNSP TEST1 R18 OPT CTRL 30 R8 237k BG1 LT3791EFE VC E9 R4 200k 0603 U1 1 29 CTRL 36 C 20 E17 39 OVLO C14 2.2uF 100V 1210 E2 R15 OPT TEST2 EN/UVLO C12 2.2uF 100V 1210 C3 2.2uF 100V 1210 C5 1uF 100V 1206 VIN 11 IVINP IVINN R13 332k 10 0402 R19 1M C2 2.2uF 100V 1210 R2 0 1206 R17 51 E4 R3 1M KEITH S. 0.003 RIN PVIN E1 32 PVIN 4.7V - 60V APPROVED PRODUCTION M5 R23 OPT 0603 31 LEDE16 B Si2318DS E18 3 GND PWM R22 E7 OPT INTVCC 0603 GND E22 Rc 0 Cc 22nF CUSTOMER NOTICE NOTE: UNLESS OTHERWISE SPECIFIED 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. ALL CAPACITORS ARE 0603. ALL RESISTORS ARE 0402. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 4 3 APPROVALS PCB DES. TECHNOLOGY HZ APP ENG. KEITH S. 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 FOUR - SWITCH BUCK-BOOST LED DRIVER CONTROLLER SIZE N/A SCALE = NONE 2 DATE: IC NO. REV. LT3791EFE 3 DC1666A Wednesday, March 07, 2012 SHEET 1 1 OF 1 A