5 4 3 2 1 REVISION HISTORY ECO REV __ DESCRIPTION 2 R7 100K PGOOD C35 3.3uF 50V (OPT) 1210 + C14 3.3uF 50V (OPT) 1210 J1 + CIN1 270uF 50V VIN+ CIN2 270uF 50V TP7 R5 SGND TP11 G ITH 2 TP5 TP6 OPT R15 JP1 VIN+ RUN 1 R30 ON 2 3 OFF R9 100 3 R10 100 C11 68pF 4 CC1 D8 BZX84C5V1 41.2K CC2 RC 0.01uF 10K INTVCC PULSE SKIP CCM 1 R22 OPT 2 R16 1K PLLIN EXTVCC 8 C7 OPT C8 OPT 9 10 11 12 3 R24 10K B 7 10K INTVCC 5 6 R21 R31 12.1K JP2 MODE 100pF 13 R25 0 R14 100 R13 100 VOUT TP10 C10 2.2uF 14 SS PGOOD SW1 SENSE1+ TG1 SENSE1- BOOST1 ITH SGND MODE/PLLIN FREQ RUN VINSNS VOUTSNS PGND BG1 VIN INTVCC EXTVCC BG2 BOOST2 ILIM TG2 IOSENSE+ SW2 IOSENSE- TRIM 27 S VFB 28 26 R23 0 25 R11 C4 0.22uF 16V 0 23 D4 DFLS160 R27 0 22 INTVCC 24 C12 (OPT) 1206 R17 0 21 C24 20 1uF 16V Q4 BSC027N04LS Q7 (OPT) L1 1.5uH D D6 B340A C28 C21 C20 C19 C17 C16 22uF 16V 1210 J2 R2 0.003 C32 C31 C30 C29 C23 (OPT) 1210 J3 1W 2512 + COUT1 330uF 16V + COUT2 G D5 B340A GND GND VOUT 12V @ 12A MAX R8 10 VOS+ 330uF 16V TP2 L2 VIN 6V - 36V VOUT VOS+ 1.5uH XAL1010-152ME C XAL1010-152ME D SS 1 S CF1 OPT CSS 0.1uF S LTC3789EGN R28 (OPT) 1206 Q3 BSC010NE2LS Q8 (OPT) G Q9 Q5 BSC010NE2LS TP1 D Q2 Q6 BSC027N04LS U1 C13 (OPT) S CF OPT VOUT1 D RFB1 113K RFB2 8.06K 5.1 C15 0.1uF 50V VIN+ D TP4 VOS+ C R20 0 C9 C25 C26 C27 3.3uF 50V 1210 DATE CHARLIE Z. 6-9-11 TP3 INTVCC D APPROVED PRODUCTION R29 (OPT) J4 G C18 10uF 6.3V D7 DFLS160 VOS- GND R1 0 19 18 C22 0.22uF 16V 17 16 15 R26 10 VIN+ VOUT B R18 0.01 1W 0805 R19 0.01 1W R32 0.01 1W 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. APPROVALS PCB DES. APP ENG. TECHNOLOGY HZ CHARLIE Z. TITLE: SCHEMATIC HIGH EFFICIENCY 12V / 12A BUCK-BOOST CONVERTER SIZE THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 4 3 2 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 DATE: IC NO. LTC3789EGN DEMO CIRCUIT 1757A Monday, October 10, 2011 REV. 2 SHEET 1 1 OF 1 A