5 4 3 2 1 REVISION HISTORY INTVCC ECO - REV DESCRIPTION 2 APPROVED PRODUCTION DATE 06-16-10 GORAN P. R26 100K PGOOD E14 INTVCC D R1 OPT SNS2- R33 38.3K 1 ON 2 OFF 3 VOUT 1 2 3 19 C17 0.1uF 18 INTVCC 17 5 GND E10 VIN L1 3.3uH PA1494.362NL SNS2- 2 D2 BAS140W Q7 OPT 4 Q8 RJK0452 TG1 PGOOD ILIM SW1 VOUT+ C20 OPT R6 232K R3 VOUT C1 OPT C2 100pF 12.1K R9 12.1K B VOUT COUT6 COUT7 22uF 25V 1812 COUT8 COUT9 R8 EXTVCC E1 R7 0 E21 R34 12.1K RSNS2 RSNS4 0.008 2010 R18 0 C9 0.1uF RUN JP2 35HVH150M GND 15 Q6 RJK0453 4 Q5 OPT C8 4.7uF 0805 16 R21 10 0 RUN 5 - 24V # VIN- 1 B RUN E9 C 1000 **B CIN1 150uF 35V EXTVCC 20 SENSE2+ VIN + 5 E12 Q3 OPT 4 22uF 25V E11 C10 VIN VIN CIN2 CIN3 CIN4 CIN5 R15 0 10 CLKIN SNS1- 23 24 25 26 BAS140W 1 2 VIN+ E7 1 2 3 R19 1000 D VBIAS 29 C18 R36 10K 9 4 JP1 TG2 3 14 PULSE SKIP BOOST2 SW2 0.1uF 2 BURST MODE BG2 SENSE2SENSE2+ FCC INTVCC SS 8 NC 7 C15 RUN 13 R35 10K 1 EXTVCC 12 SS INTVCC MODE PGND SGND ITH E8 COUT5 150uF 35V 35HVH150M C16 0.1uF MODE_PLLIN 5 6 VIN 22 21 CLKOUT 4 RUN BG1 PHSMD 3 SGND BOOST1 FREQ 2 E6 Q4 RJK0453 D1 RSNS3 RSNS1 0.008 2010 1 2 3 1 CLKOUT 27 28 R16 10K JP5 PHASMD SENSE1- LTC3787EUFD 4 11 C U1 3 SENSE1+ 60 2 o o C4 0.1uF VFB 90 C19 OPT R5 0 R11 10K L2 3.3uH PA1494.362NL R2 0 10 120 o PHASMD 1 + VIN 5 R10 OPT SENSE1+ INTVCC 22uF 25V 1812 VIN C5 1000 R17 10 SENSE1- SNS1- INTVCC R13 10 **A Q2 RJK0452 1 2 3 VIN R4 OPT COUT1 COUT2 COUT3 COUT4 5 Q1 OPT 4 + COUT10 150uF 35V 35HVH150M E2 24V / 6-10A C3 15nF * GND E4 EXTVCC VOUTVBIAS E13 GND R31 OPT VIN E5 VOUT NOTES: E15 R32 2.2 A * - FOR VIN < VOUT ONLY # - SURGE VOLTAGE UP TO 36V ** A ** B Connect to RSNS1 Connect to RSNS2 CUSTOMER NOTICE 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 RESISTORS ARE IN OHMS, 0603. ALL CAPACITORS ARE IN MICROFARADS, 0603. 2. INSTALL SHUNTS AS SHOWN. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 4 3 2 TECHNOLOGY A.K. GORAN P. TITLE: SCHEMATIC HIGH CURRENT 2-PHASE SYNCHRONOUS BOOST CONVERTER SIZE N/A SCALE = NONE 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. REV. LTC3787EUFD 2 DEMO CIRCUIT 1411A Wednesday, August 31, 2011 SHEET 1 1 OF 1 A