5 E1 VIN VIN 6.5V - 36V 60V TRANSIENT C1 2.2uF 50V 1206 TOKO D63CB-A916CY-100M L1 10uH GND E7 2 BOOST1 BOOST2 6 SW2 5 1 DA1 DA2 7 FB1 FB2 10 R2 10K BD 12 SW1 11 R7 100K U1 LT3509EDE 3 14 C8 OPT E5 C4 22uF 10V 1206 SYNC D1 DFLS140 1 2 R1 52.3K VOUT1 C2 0.1uF,16V SYNC RUN/SS2 RT RUN/SS1 R5 60.4K 700KHz 1 D VIN 4 E2 VOUT1 E3 [email protected] 2 C3 0.1uF,16V TOKO D53LC-A915AY-6R8M L2 6.8uH D2 DFLS140 2 1 R6 0 0603 R3 31.6K 8 9 VOUT2 C9 OPT 13 GND GND C 3 R4 10K 15 D 4 E4 E6 VOUT2 [email protected] C GND C5 22uF 10V 1206 SYNC RUN/SS2 E8 RUN/SS1 E9 RUN/SS2 RUN/SS1 C7 1000pF C6 1000pF B B NOTE: UNLESS OTHERWISE SPECIFIED A 1. ALL RESISTORS ARE IN OHMS, 0402. ALL CAPACITORS ARE IN MICROFARADS, 0402. CUSTOMER NOTICE CONTRACT NO. 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. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 4 3 APPROVALS DRAWN: CHECKED: APPROVED: ENGINEER: MOLLY Z. DESIGNER: TECHNOLOGY KIM T. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 LTC Confidential-For Customer Use Only TITLE: SCHEMATIC A 36V, 700mA DUAL MONOLITHIC BUCK REGULATOR SIZE A DATE: DWG NO. DC1248A-1 * LT3509EDE Wednesday, November 19, 2008 2 SHEET 1 REV A-1 1 OF 1