1 2 3 4 5 6 7 8 REVISION HISTORY ECO REV DESCRIPTION DATE 2 PRODUCTION 02/22/10 APPROVED Jian L. E20 A A CLKOUT CLKOUT E1 R77 E5 0 VIN PLLIN PLLIN VIN+ VIN J1 R26 OPT RUN 3 AVP 4 R64 20.0K OPT SHT 2 ITEMP PHASMD INTVCC 120 2 3 90 DEG DEG 1 ITEMP PHASMD 60 DEG R65 30.1K 4 9 10 R79 JP2 0 C51 OPT SHT 2 EXTVCC R48 OPT SW1 BM 2 R46 100K 3 PS 1 MODE 22 1 2 3 5 6 7 8 5 6 7 8 J3 + COUT5 330uF 2.5V 1 + COUT11 OPT C32 4.7uF 16V VOUT 1.5V / 50A TG2 GND VIN Q3 RJK0305DPB BG2 R25 16 SW2 19 BG2 7 SENSE2+ INTVCC CIN4 CIN6 22uF 22uF D2 0 4 CMDSH-3 S2+ 8 SENSE2- Q7 RJK0305DPB TG2 18 BOOST2 B J4 BG1 4.7uF 4 L2- C21 0.1uF L2 C15 BG1 BG1 BG2 BG2 TG1 TG1 TG2 TG2 SW1 SW1 SW2 SW2 S1+ S1+ S1- S1- S2+ S2+ S2- S2- RS2 1nF S24 R39 200 R44 OPT MODE COUT1 100uF 6.3V 0 4 1 2 3 INTVCC 0.001 VOUT 4 21 17 SW2 14 R42 OPT D1 R9 0.22uH Q6 RJK0330DPB CMDSH-3 23 INTVCC EXTVCC INTVCC Q2 RJK0330DPB C20 0.1uF INTVCC 4 INTVCC C11 ISET ILIM GND TG1 24 BG1 DIFFOUT 20 C S1+ 26 BOOST1 DIFFN 13 C50 1uF 31 DIFFP EXTVCC E2 VIN SW1 E3 EXTVCC 27 28 VFB PHASMD 12 49.9k R78 0 TG1 1nF 25 ITEMP 11 R66 TRK/SS AVP 6 DIFFN SENSE1+ ITH 5 DIFFP RS1 32 SENSE1- 1 2 3 2 ITH GND E6 L1 5 6 7 8 VFB R63 J2 VIN- R40 200 1 2 3 OPT VIN 4.5V - 14V L1- 5 6 7 8 C58 RUN 1 22uF 1 2 3 R31 8.45K B C42 47pF 30 22uF C14 1 2 3 TRK/SS CIN5 CIN2 + 180uF 16V 4 S1- PGND RUN 3.3nF CIN3 0.22uH 0.001 33 C41 PGOOD C2 0.1uF R2 OPT CLKOUT TRK/SS PLLIN FREQ R3 0 15 E9 4 0.1uF 29 U1 LTC3856EUH 5 6 7 8 JP1 R28 OPT 5 6 7 8 C17 C38 OPT CIN1 + 180uF 16V 2 FREQ 5 6 7 8 3 Q5 RJK0305DPB 1 2 3 OFF Q1 RJK0305DPB R7 100K 1% 5 6 7 8 1 2 VIN R30 200 1 2 3 ON R29 200 2 R18 2.2 1 VIN Q8 RJK0330DPB Q4 RJK0330DPB CCM 4 SHT 2 C JP3 MODE R67 10 E4 R68 10 PGOOD PGOOD E14 VO_SNSE13 VO_SNS+ VOUT D CUSTOMER NOTICE COUT2 100uF 6.3V COUT3 100uF 6.3V COUT4 100uF 6.3V + COUT6 330uF 2.5V + COUT7 330uF 2.5V + COUT8 330uF 2.5V + COUT9 330uF 2.5V + COUT10 330uF 2.5V + COUT12 OPT + COUT13 OPT + COUT14 OPT CONTRACT NO. LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A APPROVALS CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. MI VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL ENG. JIAN L. 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. 1 2 3 4 5 6 TECHNOLOGY 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 LTC Confidential-For Customer Use Only TITLE: SCHEMATIC HIGH EFFICIENCY POLYPHASE STEP-DOWN POWER SUPPY SIZE DATE: LTC3856EUH DEMO CIRCUIT 1580A IC NO. Wednesday, June 16, 2010 7 REV SHEET 8 1 2 OF 2 D OPTIONAL DCR SENSING TEMPERATURE COMPENSATION NETWORK FOR DCR SENSING R45 SW1 SHT 1 SW1 S1+ SHT 1 SHT 1 ITEMP1 ITEMP OPT R47 OPT R69 OPT R61 C52 S1- L1OPT RNTC OPT 2 SHT 1 S1R51 R70 SW2 SHT 1 SW2 S2+ SHT 1 OPT OPT 1 OPT R53 OPT R62 S2- SHT 1 S2- L2OPT NOTE: WHEN DCR SENSING IS IMPLEMENTED, SHORT RSENSE1 AND RSENSE2. DO NOT STUFF R29,R30,R39 AND R40 LOAD STEP CKT OPTIONAL BIAS SUPPY VOUT VIN J5 1 C54 100uF 6.3V C55 BOOST 1uF 16V 5 1 R76 C56 VIN 0 BIAS ON G IOSTEP CLK IOSTEP JP5 OFF 4 SHDN D4 B0530W FB 3 A914BYW-150 C57 10uF 10V R71 2 S 2 L3 15uH 6 3 E7 SW JP4 GND Q9 SUD50N03-09P 1 0.022uF D EXTVCC SHT 1 D3 CMDSH-3 VOUT 2 3 4 5 C53 100uF 6.3V U2 LT1616ES6 R72 0.005 R73 0.005 R74 10K 20K R75 6.65K CUSTOMER NOTICE X4 X7 1 1 X5 X6 1 1 USED TO MANUFACTURE THE PCB REPRESENTS STAND OFFS 1 X9 1 X10 1 X8 Represents Tooling Holes on PCB CONTRACT NO. LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A APPROVALS CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; PCB DES. MI HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL ENG. JIAN L. 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. TECHNOLOGY 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 LTC Confidential-For Customer Use Only TITLE: SCHEMATIC HIGH EFFICIENCY POLYPHASE STEP-DOWN POWER SUPPLY SIZE IC NO. LTC3856EUH REV DEMO CIRCUIT 1580A DATE: Thursday, March 25, 2010 SHEET 2 2 OF 2