B A REVISION HISTORY ECO 17 APPROVED DATE JESUS R. 12-06-10 4 VOUT E1 C6 100pF R5 10K 12V, 3.5A Q2 Si7141DP GATE 2 GND RT R12 6.3K 5 6 7 8 C5 4.7uF 16V 1206 VIN R7 86.6K C7 0.1uF R8 100K 1 21 20 CLKOUT E4 VC SS 16 OFF 11 12 13 14 15 LT3579EFE-1 SYNC R6 10K 0805 FB C4 22uF 25V 1210 C3 22uF 25V 1210 R4 64.9K 0805 SW2 SW2 SW2 SW2 SW2 U1 SHDN CLKOUT OUTPUT 1 10 9 8 7 6 GATE 18 2 FAULT SW1 SW1 SW1 SW1 SW1 3 GATE 1 2 3 19 R1 22.1K 0805 FAULT R3 100K 4 5 R2 OPT C15 4.7uF 16V 1206 PRODUCTION D1 MBRM560 VIN J2 C2 4.7uF 16V 1206 VIN VIN DESCRIPTION 3 L1 IHLP-2525CZER2R2M01 SYNC GND C1 4.7uF 16V 1206 5 6 7 8 4 J1 VIN2 1 2 3 VIN 5V-10V __ Q1 OPT VIN REV D3 OPT C8 4.7nF 2 ON 2 GND E2 3 L2 VIN2 IHLP-2525CZER2R2M01 JP1 VIN D2 MBRM560 3 17 FAULT GATE FB C12 0.1uF 1 1 GND R9 86.6K CUSTOMER NOTICE NOTE: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTORS ARE IN 0402. ALL CAPACITORS ARE IN 0402. R14 0 R15 OPT R16 10K OPT C13 OPT C14 OPT 1 APPROVALS 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. TECHNOLOGY A.K. JESUS R. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. TWO BOOST REGULATORS IN PARALLEL IC NO. DATE: REV. LT3579EFE-1, LT3579EFE N/A SCALE = NONE 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 SIZE 2. INSTALL SHUNTS AS SHOWN. B C9 22uF 25V 1210 2 21 SS RT 18 CLKOUT VC 19 E3 CLKOUT 20 16 SYNC LT3579EFE CLKOUT C10 22uF 25V 1210 11 12 13 14 15 U2 SHDN R13 0 SW2 SW2 SW2 SW2 SW2 4 SW1 SW1 SW1 SW1 SW1 10 9 8 7 6 FAULT 5 R17 OPT 0805 C11 4.7uF 16V 1206 VIN VIN2 3 DEMO CIRCUIT 1661A Wednesday, February 23, 2011 A SHEET 1 OF 1