5 4 3 2 1 REVISION HISTORY ECO PGOOD REV DESCRIPTION PROD 1 E1 APPROVED JOSHUA Y. INTVCC1 PGOOD INTVCC1 DATE 06/11/12 R1 100K R2 OPT ILIM VOUT D D Q3A BSC014N04LSI R3 OPT R4 VIN R5 C3 9 VIN R20 C10 0.01uF VOUT RUN R22 38.3K 1% 1 2 OFF 0 E2 VIN+ TG1 25 24 SW1 ILIM PGOOD 26 27 23 20 19 C4 1uF 16V CIN1A 22uF 25V 1812 0.003 2512 123 0.1uF 17 15 INTVCC1 CIN4A 22uF 25V 1812 + CIN5 330uF 35V 330uF 35V E4 E11 CIN2B 22uF 25V 1812 CIN3B 22uF 25V 1812 C GND CIN4B 22uF 25V 1812 INTVCC1 Q2A BSC014N04LSI 123 EXTVCC1 123 R13 4 4 Q2B BSC014N04LSI 0 5 SNS2- L1 1.0uH Q1A BSC014N04LSI OPT VIN E8 GND RSNS4 E13 0.003 2512 4 4 EXTVCC RSNS3 SER2010-102ML COILCRAFT Q1B 1 2 3 OPT E10 OPT EXTVCC2 R16 BAS140W VOUT+ B E19 0 5 5 E14 C16 VOUT COUT1A 22uF 25V 1812 0.01uF VIN [3] 5V - 24V + CIN6 VIN CIN1B 22uF 25V 1812 C9 4.7uF 25V 0805 16 CIN3A 22uF 25V 1812 GND 123 EXTVCC1 C7 18 CIN2A 22uF 25V 1812 GND 2.2 C14 R29 0 RSNS2 VOUT 1000pF R28 12.1K 1% VFB 4 E3 E6 R21 22.1K R27 0 4 VIN RSNS1 Q4B BSC014N04LSI 5 R26 10pF SNS1- 5 123 C15 R25 12.1K 1% COUT3 + 330uF 35V 0 R10 OPT R11 D2 232K 1% 3 JP2 VIN R18 10pF R24 R23 ON VBIAS C13 VIN RUN R8 21 C11 0.1uF C12 OPT RUN E12 BOOST2 SENSE2+ 10 B 28 R17 10 10K JP1 BG2 SENSE2- Q4A BSC014N04LSI 5 GND 8 C8 0.1uF TG2 SNS2- INTVCC SS INTVCC1 29 R19 4 0.01uF R14 0 3 BURST MODE (BM) SS EXTVCC RUN 7 14 10K C32 SW2 2 SGND 6 0 NC R15 R12 PGND 13 FCC PULSE SKIP (PS) 1 PLLIN/MODE SGND 5 RUN VFB INTVCC1 MODE C6 OPT SENSE2+ C5 10pF COUT5B 22uF 25V 1812 123 SER2010-102ML COILCRAFT D1 22 CLKOUT 4 CLKIN VIN PHSMD 3 E9 BOOST1 FREQ 2 12 CLK C COUT4B 22uF 25V 1812 E18 BAS140W BG1 ITH 1 11 0 SENSE1- R9 U1 LTC3787EUFD SENSE1+ OPT OPT R47 OPT C2 0.1uF FREQ 10 E5 PHASMD COUT5A 22uF 25V 1812 L2 1.0uH SENSE1+ INTVCC1 PHASMD 4 123 SENSE1- 10 INTVCC1 R7 4 C1 0.01uF R6 R46 OPT 5 COUT4A 22uF 25V 1812 0 10 SNS1- Q3B 5 OPT COUT2A 22uF 25V 1812 COUT1B 22uF 25V 1812 COUT2B 22uF 25V 1812 COUT6 + 330uF 35V VOUT [2] 24V / 12VIN TO 30A E15 GND E16 ITH GND GND E17 MASTER A CUSTOMER NOTICE NOTES: UNLESS OTHERWISE SPECIFIED, APPROVALS LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APP ENG. APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. 1. ALL CAPACITORS AND RESISTORS ARE 0603. [2] - FOR VIN < VOUT ONLY [3] - SURGE VOLTAGE UP TO 30V TECHNOLOGY MI/RB JOSHUA Y TITLE: SCHEMATIC HIGH CURRENT 4-PHASE SYNCHRONOUS BOOST CONVERTER SIZE C:\DESIGN\20\2001A-1\2001A-1.DSN N/A THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 4 3 SCALE = NONE 2 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only DATE: IC NO. LTC3787EUFD DEMO CIRCUIT 2001A 01/29/13 06:36:18 SHEET 1 1 REV. 1 OF 2 A 5 4 3 2 1 VOUT Q7A BSC014N04LSI D R30 ILIM PGOOD COUT7A 22uF 25V 1812 Q7B 5 OPT 5 4 4 COUT8A 22uF 25V 1812 COUT7B 22uF 25V 1812 COUT8B 22uF 25V 1812 + COUT9 330uF 35V D 0 VIN 123 123 R31 10 R32 SENSE3- 10 R41 10 23 TG1 25 24 SW1 ILIM PGOOD 26 27 INTVCC SS BG2 SENSE2- BOOST2 SENSE4+ C28 OPT VIN R34 19 C21 1uF 16V 5 0.003 2512 CIN8A 22uF 25V 1812 CIN9A CIN10A 22uF 22uF 25V 25V 1812 1812 + CIN11 + CIN12 330uF 35V 330uF 35V Q8B BSC014N04LSI 4 0 VIN 123 VOUT CIN7B 22uF 25V 1812 2.2 CIN8B 22uF 25V 1812 CIN9B CIN10B 22uF 22uF 25V 25V 1812 1812 C EXTVCC2 C23 18 0.1uF 17 INTVCC2 C25 4.7uF 25V 0805 16 15 Q6A BSC014N04LSI R40 D4 INTVCC2 123 4 123 4 Q6B BSC014N04LSI 0 5 BAS140W 5 L3 1.0uH Q5A 10pF B CIN7A 22uF 25V 1812 RSNS6 5 123 OPT R35 20 C27 0.1uF C29 VBIAS GND SENSE4C26 0.01uF VIN EXTVCC RUN Q8A BSC014N04LSI R33 4 D3 21 29 R39 10 8 SGND TG2 0 SNS4- 7 C24 0.1uF PGND 14 R38 6 0.01uF PLLIN/MODE 9 C22 10pF C33 SS 22 CLKOUT SENSE2+ RUN 100 SGND 5 PHSMD SW2 R37 0 VIN NC 4 CLK BG1 ITH 3 CLKOUT BOOST1 RSNS5 SER2010-102ML COILCRAFT INTVCC2 BAS140W FREQ 13 2 12 1 E7 SENSE1+ SENSE1- U2 LTC3787EUFD C20 OPT R36 28 OPT 11 FREQ VFB PHASMD2 R49 OPT C C19 0.1uF C18 10 R48 OPT VIN SNS3- L4 1.0uH SENSE3+ C17 0.01uF SNS3- INTVCC2 BSC014N04LSI R42 0 R43 RSNS7 SER2010-102ML COILCRAFT 4 RSNS8 Q5B 1 2 3 OPT 123 VIN SNS4- 0.003 2512 4 B 0 VFB C30 5 VOUT 5 1000pF ITH R44 R45 0 22.1K C31 COUT10A 22uF 25V 1812 0.01uF COUT11A 22uF 25V 1812 COUT10B 22uF 25V 1812 COUT11B 22uF 25V 1812 + COUT12 330uF 35V SLAVE 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 CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. A APPROVALS PCB DES. MI/RB APP ENG. JOSHUA Y TECHNOLOGY TITLE: SCHEMATIC HIGH CURRENT 4-PHASE SYNCHRONOUS BOOST CONVERTER SIZE THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 4 3 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only N/A SCALE = NONE 2 DATE: IC NO. LTC3787EUFD DEMO CIRCUIT 2001A 12/17/12 06:13:00 SHEET 2 1 REV. 1 OF 2 A