5 U1 2 7 D1 OPT SW2 SW1 VOUT1 16 2 E3 * C11 2.2uF 16V 0603 6 2 PGOOD2 E7 13 1 2 4 6 8 SHDN1 R2 1M E6 PGOOD1 REG1 12 FB1 2 VOUT2 C8 OPT SGND 11 1 3 5 7 OFF ON SEQ. EXT NOTE: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTORS ARE IN OHMS, 0402. ALL CAPACITORS ARE IN MICROFARADS, 0402. 2. INSTALL SHUNTS ON JUMPERS AS SHOWN. JP3 FIXED FREQ. AUTO BURST 1 2 3 JP4 E5 GND R6 357k VOUT2 SELECT VOUT2 R8 221k C9 10uF 10V 0805 C10 1uF 10V E8 E9 VOUT2 1.8V/2.85V/3.3V GND R9 90.9k ASSY -A 2.2MHz 1.2MHz CUSTOMER NOTICE 3 B -B U1 LTC3527EUD LTC3527EUD-1 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. 4 C7 1uF 10V VOUT1 3V/3.3V/5V * FOR ASSEMBLY THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 C6 10uF 10V 0805 E4 R10 249k 14 GND FSEL 17 3 10 MODE OFF ON SEQ. EXT R5 61.9k REG2 3 2 1 VOUT1 JP8 HD2X3-079 R7 124k SHDN2 JP6 HD2X4-079 A VOUT1 SELECT 2 4 6 8 B 1 8 SHDN2 FB2 2 C R4 249k SHDN1 D JP7 HD2X3-079 R3 374k PGOOD2 E10 D4 OPT C5 OPT 1 3 5 7 JP5 HD2X4-079 D2 OPT 5 R1 1M C 1 4 SUMIDA CDRH2D18/HP L2 3.3uH 2 3.0V 4 3.3V 6 5V 1 D3 OPT L1 3.3uH SUMIDA CDRH2D18/HP 1 3 5 VOUT2 VIN VIN1 C3 4.7uF 10V 0603 JP2 VIN 15 OPT 3216 VIN2 9 +C2 VIN SINGLE JP1 E12 PGOOD1 1 2 1.8V 4 2.85V 6 3.3V E2 C4 4.7uF 16V 0805 VIN2 VIN1 1 3 5 INPUTS PARALLEL 1 2 3 3 2 1 OPT 3216 VIN2 GND +C1 E11 VIN2 0.7V - 5.5V 2 VIN1 1 D 3 E1 VIN1 0.7V - 5.5V GND 4 APPROVALS DRAWN: CHECKED: APPROVED: ENGINEER: FRAN H. 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 DUAL SYNCHRONOUS BOOST CONVERTER SIZE A DATE: DWG NO. DC1237A-1 * LTC3527EUD/-1 Monday, May 04, 2009 2 SHEET 1 REV A-1 1 OF 1