5 4 3 2 SW300 1 L1 3.3UH E1 C1 10UF,6.3V 0603 R1 0 C2 0.1UF VOUT4 [email protected] VO 300 GND C3 20PF D E2 R2 133K D FB300 R3 107K SW200A L2 3.3UH VIN E5 VIN 2.25V - 5.5V * C8 4.7UF,10V 0603 C VIN 16 RUN200B 15 VCC 14 GNDA 13 SW100 C5 0.1UF SW200B 4 SW200A 5 RUN100 PGND 6 PVIN 7 E4 R5 0 GND FB200A C R6 100K C9 4.7UF,10V VIN 0603 SW200B L3 4.7UH SW300 8 E7 C10 10UF,6.3V 0603 C11 0.1UF R7 0 VOUT2 [email protected] VO 200B GND E8 R8 93.1K C12 20PF RUN200A R9 2.2M VOUT3 [email protected] VO 200A 17 RUN VOUT1 ON JP2 OFF VO 100 10 FB300 9 RUN300 C6 OPT FB200B 1 FB200A 2 RUN200A 3 12 RUN100 11 FB100 RUN VOUT3 ON JP1 OFF VO 200A R4 0 U1 VIN GND GND C4 10UF,6.3V 0603 C7 10UF,10V 0805 E6 E3 FB200B R10 2.2M R11 107K RUN VOUT2 ON JP3 OFF VO 200B B RUN VOUT4 ON JP4 OFF VO 300 RUN300 SW100 L4 10UH RUN200B R13 2.2M E9 C13 10UF,6.3V 0603 R12 0 C15 20PF R15 59K R14 2.2M C14 0.1UF B VOUT1 [email protected] VO 100 GND E10 FB100 R16 118K * FOR ASSEMBLY VERSIONS U1 -A LTC3544EUD -B LTC3544BEUD A CUSTOMER NOTICE NOTES: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTORS ARE IN OHMS, 0402. ALL CAPACITORS ARE IN MICROFARADS, 0402. 2. INSTALL SHUNT ON JP1-JP4 PINS 1&2. 5 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. CONTRACT NO. APPROVALS DRAWN: TITLE: SCHEMATIC CHECKED: 3 QUAD DC/DC CONVERTER APPROVED: ENGINEER: VICTOR K. DESIGNER: SIZE A THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 4 TECHNOLOGY KIM T. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 LTC Confidential-For Customer Use Only DATE: 2 DWG NO. DC1040A-2 * LTC3544EUD/BEUD Tuesday, January 23, 2007 SHEET 1 REV A-2 1 OF 1 A