5 4 3 2 1 REVISION HISTORY ECO REV __ DESCRIPTION 1 PGOOD1 C35 3.3uF 50V (OPT) 1210 C14 3.3uF 50V (OPT) 1210 C62 2.2uF 50V 1206 + C63 2.2uF 50V 1206 VOS+ CIN1 270uF 50V VIN1+ TP11 G 2 TP5 ITH1 R9 100 3 R10 100 C11 68pF 4 ITH1 TP6 3 OFF OPT CC1 100pF RUN D8 BZX84C5V1 41.2K CC2 RC 0.01uF 10K 6 7 R21 R31 12.1K 8 10K INTVCC1 R75 OPT 9 INTVCC1 R22 OPT C7 OPT 10 C8 OPT 11 12 PLLIN1 R24 10K 13 R25 0 R16 1K B R14 100 R13 100 VOUT PLLIN1 TP10 5 C10 SS PGOOD SW1 SENSE1+ TG1 SENSE1- BOOST1 ITH SGND MODE/PLLIN PGND BG1 VIN FREQ INTVCC RUN EXTVCC VINSNS VOUTSNS BG2 BOOST2 ILIM TG2 IOSENSE+ SW2 IOSENSE- TRIM 27 R17 0 26 R23 0 25 R11 C4 0.22uF 16V 0 23 D4 DFLS160 R27 0 22 INTVCC1 24 21 C24 1uF 16V 20 19 C12 (OPT) 1206 G D L1 3uH CIN2 270uF 50V D5 B340A Q9 Q5 BSC010NE2LS J2 GND VOUT R2 0.003 C32 C31 C30 C29 C23 (OPT) 1210 C64 C65 2.2uF 1206 25V 1W 2512 VOUT J3 + COUT1 330uF 25V + COUT2 12V @ 25A MAX R8 10 VOS+ 330uF 25V VOS+ TP2 R66 (OPT) C VOS- TP1 C13 (OPT) R29 (OPT) GND J4 G C18 10uF 6.3V D7 DFLS160 R1 0 GND TP7 IREF1 XAL1580-302ME Q4 BSC027N04LS Q7 (OPT) D6 6V - 36V 18 C22 0.22uF 16V 17 16 15 4.7uF R26 10 0805 VIN1+ EXTVCC 14 VFB S CSS 0.1uF SS 28 D 1 S CF1 OPT B340A S LTC3789EGN SS R28 (OPT) 1206 Q3 BSC010NE2LS Q8 (OPT) G D Q2 Q6 BSC027N04LS U1 C28 C21 C20 C19 C17 C16 22uF 16V 1210 R65 (OPT) S VFB1 CF OPT VOUT1 D RFB1 113K RFB2 8.06K 5.1 C15 0.1uF 50V VIN J1 + R5 SGND JP1 VIN1+ RUN 1 R30 ON 2 VIN1+ D TP4 R15 DATE 5/6/2014 VIN R20 0 C9 C25 C26 C27 3.3uF 50V 1210 R7 100K C Jeoffrey W. TP3 INTVCC1 D APPROVED PRODUCTION VOUT B R18 0.006 2W 0805 EXTVCC1 R32 0.006 2W R6 OPT TP12 R12 OPT R4 100 R3 100 NOTE: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTORS ARE IN OHMS, 0603. ALL CAPACITORS ARE IN MICROFARADS, 0603. A 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. 2. INSTALL SHUNTS AS SHOWN. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 4 3 2 APPROVALS PCB DES. APP ENG. TECHNOLOGY HZ Jeoffrey W. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only TITLE: SCHEMATIC HIGH EFFICIENCY 2-PHASE BUCK-BOOST CONVERTER SIZE N/A SCALE = NONE DATE: IC NO. LTC3789EGN DEMO CIRCUIT 2253A Monday, May 12, 2014 SHEET 1 1 REV. 1 OF 3 A 5 4 3 2 1 INTVCC2 R50 100K TP20 VIN2+ VIN R33 0 C37 C56 C45 C54 3.3uF 50V 1210 D VOS+ C36 3.3uF 50V (OPT) 1210 C41 3.3uF 50V (OPT) 1210 C66 2.2uF 50V 1206 CIN4 270uF 50V C67 2.2uF 50V 1206 + + CIN3 270uF 50V D VIN2+ R58 2 ITH1 R53 R69 0 C Run R54 100 3 100 C51 68pF 4 CC4 100pF R72 CC3 0.01uF 0 5 RC1 6 10K 7 R44 10K INTVCC2 INTVCC2 R63 OPT R74 OPT 8 9 C33 OPT 10 C34 OPT 11 12 13 R34 10K PLLIN2 R62 0 R45 1K B R41 100 R40 100 VOUT C38 14 VFB PGOOD SS SW1 SENSE1+ TG1 SENSE1ITH SGND MODE/PLLIN FREQ RUN VINSNS VOUTSNS BOOST1 PGND BG1 VIN INTVCC EXTVCC BG2 BOOST2 ILIM TG2 IOSENSE+ SW2 IOSENSE- TRIM 28 27 R43 0 26 R48 0 25 R51 0 23 D12 DFLS160 R57 0 22 INTVCC2 24 20 G D11 B340A 6.3V D13 DFLS160 R460 C55 1uF 16V 19 D VOUT R59 0.003 C48 C50 C47 C49 C46 (OPT) 1210 C68 C69 2.2uF 25V 1206 1W 2512 + COUT3 330uF 16V + COUT4 330uF 16V 3uH Q14 Q15 BSC010NE2LS C C59 (OPT) R60 (OPT) G 18 C52 0.22uF 16V 17 16 15 VOUT R55 10 0805 B R35 0.006 2W 0805 EXTVCC R73 L2 D10 B340A C53 C44 C42 C40 C43 C58 22uF 16V 1210 XAL1580-302ME Q12 BSC027N04LS Q13 (OPT) C57 10uF 21 4.7uF VIN2+ C5 0.22uF 16V C60 (OPT) 1206 S 1 Q10 BSC010NE2LS Q11 (OPT) G D R68 OPT R61 (OPT) 1206 S G S CF3 OPT CSS1 0.1uF LTC3789EGN D U2 R67 0 SS R76 0 Q16 Q17 BSC027N04LS D RFB4 (OPT) CF2 OPT VOUT2 S RFB3 (OPT) 5.1 C39 0.1uF 50V VFB1 R64 0.006 2W (OPT) R38 OPT R39 OPT R37 100 R70 R36 100 R71 OPT 0 NOTE: UNLESS OTHERWISE SPECIFIED IREF1 1. ALL RESISTORS ARE IN OHMS, 0603. ALL CAPACITORS ARE IN MICROFARADS, 0603. A 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. 2. INSTALL SHUNTS AS SHOWN. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 4 3 2 APPROVALS PCB DES. APP ENG. TECHNOLOGY HZ Jeoffrey W. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only TITLE: SCHEMATIC HIGH EFFICIENCY 2-PHASE BUCK-BOOST CONVERTER SIZE N/A SCALE = NONE DATE: IC NO. LTC3789EGN DEMO CIRCUIT 2253A Wednesday, May 14, 2014 SHEET 2 1 REV. 1 OF 3 A 5 4 3 2 1 D D INTVCC1 U3 LTC6908CDCB-1 1 2 C61 0.1uF 3 MOD V+ OUT2 GND OUT1 6 5 PLLIN2 4 PLLIN1 C 7 C SET GND R56 499K B B 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. A THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 4 TECHNOLOGY HZ 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only Jeoffrey W. TITLE: SCHEMATIC HIGH EFFICIENCY 2-PHASE BUCK-BOOST CONVERTER SIZE IC NO. LTC3789EGN DEMO CIRCUIT 2253A N/A SCALE = NONE 3 DATE: Tuesday, May 06, 2014 2 SHEET 3 1 REV. 1 OF 3 A