5 4 3 2 1 REVISION HISTORY ECO * Refer to QSG for PVIN Range. REV PVIN PVIN + E2 C7 4.7uF 63V Walker Bai 06-03-08 1 PRODUCTION Walker Bai 10-21-09 C8 1uF 50V D PVIN PVIN SW3 L3 D3 VIN 27uH E7 U1 LT3492EFE GND C9 28 VIN LEDs ON CTRL2 CTRL3 VREF R10 100k 1% JP4 CTRL1 CAP3 R11 34k 1% 5 R12 34k 1% R13 34k 1% R14 100k 1% R15 100k 1% R16 100k 1% 8 E14 7 E15 6 R18 (Opt) TG3 VREF SW3 C10 0.1uF 6.3V E13 R17 (Opt) SHDN OVP3 CTRL1 CAP2 CTRL2 CTRL3 LED2 R19 (Opt) TG2 SW2 PWM1 PWM2 PWM3 E16 4 E17 3 E18 2 9 VREF C11 R23 432k 1% 12 18.2K 1% 2200pF C12 R21 C13 R24 100k 1% (1MHz) R20 2200pF 2200pF R22 11 18.2K 1% 10 18.2K 1% PWM1 OVP2 25 CAP3 CAP1 FADJ LED1 VC1 TG1 VC2 SW1 VC3 R9 2 3 1.65 1% R7 7.15M 1% 26 LED3 27 TG3 LED3- MODE3 1 BUCK/BOOST E6 2 3 Q3 ZXMP6A13F BOOST JP3 24 SW3 13 OVP3 PVIN PVIN SW2 L2 D2 27uH B1100 OVP1 C PVIN C3 2.2uF 25V (Opt) C4 1uF 100V CAP2 21 LED2 OVP2 20 TG2 23 SW2 R5 124k 1% 14 OVP2 18 CAP1 17 LED1 16 TG1 SW1 OVP1 3 E11 LED2+ LED2- MODE2 1 BUCK/BOOST E12 PVIN L1 D1 B1100 3 BOOST JP2 TG2 PVIN C1 2.2uF 25V (Opt) C2 1uF 100V 2 Q2 ZXMP6A13F PVIN SW1 27uH 15 2 1.65 1% R4 7.15M 1% CAP2 19 LED2 R6 22 CAP1 LED1 R3 2 3 1.65 1% R1 7.15M 1% E21 LED1+ LED1- MODE1 1 BUCK/BOOST E22 B 2 3 Q1 ZXMP6A13F BOOST JP1 TG1 OVP1 R2 124k 1% GND 29 CUSTOMER NOTICE A APPROVALS TECHNOLOGY RB Walker Bai 3 SCALE = NONE 2 A TITLE: SCHEMATIC TRIPLE BOOST OR BUCK/BOOST LED DRIVER N/A THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 1630 McCarthy Blvd. Milpitas, CA 95035 www.linear.com Phone: (408)432-1900 Fax: (408)434-0507 LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY SIZE 4 LED3+ TG3 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. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APP ENG. APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. 5 E5 R8 124k 1% PWM2 PWM3 LED3 OVP3 LED3 1 3 OFF VIN 1uF 6.3V 1 2 C C6 1uF 100V CAP3 1 E8 B1100 PVIN C5 2.2uF 25V (Opt) 1 GND B DESCRIPTION E1 D VIN 5V DATE 1st Prototype 1 * APPROVED 0 DATE: IC NO. REV. LT3492EFE DEMO CIRCUIT 1405A Wednesday, January 13, 2010 1 SHEET 1 1 OF 1