5 4 3 2 1 REVISION HISTORY LED1+ GND PVIN R27 105K 1210 C25 C19 C5 4.7uF 1210 L1 10uH D1 2 1 3 PDS360 R26 100K PVIN R31 OPT OVLO E24 PVIN R20 140K R41 OPT 0603 R17 1M 1 PDS360 4 R12 0.008 2010 R11 0.008 2010 51 E4 52 10 7 GND GND GND GND FLT1 UP TO 50V LED 1A E12 LED3+ OUT1 R14 1M 0603 R15 1M 0603 E14 C R10 R16 1M 0603 E15 E16 E17 49 4 REF C8 0.1uF 0603 E18 L4 47uH R38 OPT 0603 SD25-470-R OUT3 23.2K 38 47 OUT2 23.2K OUT3 30 48 OUT1 OUT2 R9 R37 OPT 0603 17 E13 23.2K R39 OPT 0603 R40 OPT 0603 E19 E20 5 E21 6 GND GND GND PWM1 PWM2 B PWM3 R1 47.5K C9 10uF 10V 0603 310kHz E27 C16 OPT E28 C10 6.8nF R5 3.9K E29 C17 OPT C11 6.8nF C12 6.8nF R6 3.9K R7 3.9K SYNC 12 SS3 41 SS2 27 SS1 20 53 45 GND FLT3 E9 C13 0.1uF C14 0.1uF C15 0.1uF 0603 0603 0603 A CUSTOMER NOTICE THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 4 E22 SYNC R30 0 0603 C18 OPT 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. 5 2 R8 35 PWM3 FLT2 UP TO 50V LED 1A E11 LED2+ D6 PVIN TG3 36 37 ISP3 ISN3 42 43 SENSEP3 SENSEN3 44 GATE3 32 33 TG2 ISP2 ISN2 31 26 25 SENSEP2 SENSEN2 TG1 24 14 15 ISP1 PWM1 VC3 2 E8 E26 ISN1 16 21 22 REF INTVCC INTVCC SW2 PWM2 1 3 E7 CTRL3 40 R25 100K 0603 R34 OPT VC2 FLT3 E6 R24 100K 0603 R33 OPT 28 FLT2 R23 100K 0603 R32 OPT BOOST U1 LT3797EUKG INTVCC FLT1 REF FBH1 SW1 CTRL2 D ES1B R36 OPT 0603 CTRL1 VC1 E5 INTVCC B 9 2 1 R35 OPT 0603 R45 OPT 0603 OPT FBH3 19 CTRL3 R19 1M UP TO 50V LED 1A E10 LED1+ D5 PVIN OVLO RT R22 140K 8 2 1 C24 FBH2 11 PVIN 01-15-14 ES1B R4 .25 M6 2010 SI7113DN 3 8 2 7 1 6 5 LED3+ PVIN R13 0.008 2010 EN/UVLO 46 CTRL2 VIN GATE2 50 R18 1M INTVCC R21 140K SENSEP1 PVIN SENSEN1 23 GATE1 C E25 DATE KEITH S. D4 OPT CTRL1 APPROVED ES1B 1 100V 1210 4 R43 OPT 0603 R44 OPT 0603 R42 OPT C23 0603 C22 OPT 1 PDS360 BSC039N06NS M5 R3 .25 M4 2010 SI7113DN 3 8 2 7 1 6 5 PRODUCTION 1210 C29 C21 C7 4.7uF D3 2 3 DESCRIPTION 5 C30 OPT 1210 L3 10uH 100V 1210 BSC039N06NS M3 4 R28 0 4 1 2 3 R46 OPT 2 3 R2 .25 M2 2010 SI7113DN 3 8 2 7 1 6 5 5 6 7 8 E23 EN/UVLO D2 100V 1210 BSC039N06NS M1 1210 C27 C20 C6 4.7uF 1210 L2 10uH C33 C4 4.7uF 50V 1210 REV __ 4 C1 1uF 50V 0805 C32 C3 4.7uF 50V 1210 5 6 7 8 VIN J2 D C31 C2 4.7uF 50V 1210 ECO OUT3 C36 OPT PVIN 1 2 3 VIN E2 C37 33uF 50V 5 6 7 8 2.5V - 40V + R29 0 1206 C35 OPT PVIN LED2+ OUT2 C28 OPT 1 2 3 PVIN C34 OPT PVIN PVIN OUT1 C26 OPT 4 PVIN J1 3 APPROVALS PCB DES. APP ENG. TECHNOLOGY LT 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 TRIPLE LED BOOST CONTROLLER SIZE N/A SCALE = NONE 2 DATE: IC NO. REV. LT3797EUKG DC1784A 5 Wednesday, January 15, 2014 SHEET 1 1 OF 1 A