5 3 2 C18 10uF 10V 1206 HD2X3-079 R1 10 Q3 Si3447BDV OPT C5 47uF 6.3V 1210 6 5 2 1 6 5 2 1 1 C7 10uF 10V 1206 D1 B320A OPT 3 4 2 150uF 4V OPT RUN/SS C15 OPT IPRG1 E10 SGND R10 10K IPRG1 E13 BG2 13 PGND 16 14 RUN/SS 6 VREF 1% R4 187K 1% C11 470pF IPRG2 2 VFB2 7 R3 OPT C16 OPT C13 330pF R8 15K B D2 B320A IHLP-2525CZ-01 OPT L2 1.5uH C4 47uF 6.3V 1210 D3 B320A OPT R5 0 ITH2 8 C12 100pF Q2A Si7540DP 2 Q6 Si3460DV OPT 3 PGOOD 9 PLLLPF 3 23 IPRG1 24 VFB1 D GND 7 8 TG2 15 SW2 10 19 BG1 18 SYNC/SSEN E6 VIN 2.75V - 8V 5 6 VIN 5 17 TG1 22 SW1 1 ITH1 R12 0 VIN Q5 Si3460DV OPT 3 4 RUN/SS E8 3 Q4 Si3447BDV OPT 1 IHLP-2525CZ-01 PGND 12 SENSE2+ 11 SGND 2 C17 10uF 10V 1206 Q2B Si7540DP 1 4 8 7 20 PGND 21 SENSE1+ 4 PGND 25 6 5 U1 LTC3776EUF C2 22uF 10V 1210 OPT 3 3 0603 L1 1.5uH + C6 E4 GND 1 VOUT1 (VDDQ) 2.5V ( 5A@5VIN) E2 VOUT1 C1 22uF 10V 1210 C3 1uF 10V 4 Q1B Si7540DP Q1A Si7540DP R2 1M E1 C14 2200pF C10 0.01uF R9 6.2K R6 10K C8 10uF 10V 1206 VOUT2 (VTT)=VOUT1 /2 1.25V (+/-5A@5VIN) E3 VOUT2 C9 + 150uF E5 4V OPT GND C 2 1 1 2 VIN 2 D 3 1 2 5 6 300K/550K/750KHz VIN 5 4 4 SPREAD SPECTRUM JP1 MODE 4 6 SYNC C 1 E12 1 2 5 6 SYNC 4 VIN 1% PGOOD E7 IPRG2 E11 IPRG2 PLLLPF E9 VIN C19 OPT R11 10K PGOOD PLLLPF B R7 59K 1% A NOTES: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTORS ARE IN OHMS, 0402. ALL CAPACITORS ARE 0402. 2. INSTALL SHUNT ON JP1 PIN 1 AND 2. CUSTOMER NOTICE 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 CIRUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. CONTRACT NO. APPROVALS DRAWN: TITLE: CHECKED: APPROVED: ENGINEER: CHARLIE Z. DESIGNER: THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 4 3 TECHNOLOGY KIM T. SIZE A DATE: 2 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 LTC Confidential-For Customer Use Only 2-PHASE DUAL STEP-DOWN CONVERTER FOR DDR/QDR MEMORY TERMINATION DWG NO. DC829A - LTC3776EUF Friday, October 08, 2004 SHEET 1 1 REV A OF 1 A