5 4 3 2 1 REVISION HISTORY ECO REV __ DESCRIPTION 2 APPROVED DATE GORAN P. 08-12-10 PRODUCTION VOUT E1 INTVCC COUT1 BSC027N04 4 E9 8 7 6 5 Q1 PGOOD 25V 1812 COUT3 4 + COUT5 150uF 35V Q2 GND COUT6 1 2 3 1 2 3 R13 J2 OPT C1 VOUT- OPT E2 VIN SNS- C C5 C17 1000pF OPT R9 10 1 2 3 CS- 4 INTVCC R14 10K 6 2 PULSE SKIP 3 BURST MODE 4 C19 1000pF 8 R17 10K JP1 7 INTVCC CLKIN SENSE1+ SW SENSE1- TG ITH BOOST SS VBIAS MODE/PLLIN INTVCC FREQ BG RUN R15 TBD R18 0 PGOOD GND C4 0.1uF 16 INTVCC R7 OPT BAS140W 15 VOUT RUN R19 38.3K 1 ON VBIAS C 13 3 11 10 INTVCC 9 Q4 VBIAS BSC027N04 C7 0.1uF 4 C8 4.7uF 0805 4 VIN VIN 0 E3 Q3 CIN2 OPT CIN3 CIN5 R16 VIN+ VIN 22uF 25V 1812 + J3 CIN1 150uF 35V 35HVH150M 4 - 24V # GND B J4 VBIAS E4 2 VIN- 3 VIN R20 12.1K JP2 CS- 12 1 VOUT 2 RUN OFF 0.005 CS+ CIN4 B RSNS1 RSNS2 0.005 R11 OPT VIN E7 R8 OPT 14 E6 RUN D1 GND 1 FCC 5 SS VFB 17 MODE SNS- LTC3786EMSE 8 7 6 5 R3 OPT U1 CS+ C15 0.1uF 1 2 3 E5 L1 3.3uH PA1494.362NL R12 12.1K 10 0 SS R10 232K ** R5 8 7 6 5 R2 R4 16.9K 1 2 3 C3 15nF D 35HVH150M COUT4 0 R6 0 22uF COUT2 VOUT C2 100pF VOUT 24V / 3 - 5A J1 R1 100K 8 7 6 5 D VOUT+ JP3 GND E8 NOTE: UNLESS OTHERWISE SPECIFIED A * - FOR VIN < VOUT ONLY, VOUT FOLLOWS VIN WHEN VIN >/= VOUT # - SURGE VOLTAGE UP TO 36V * * A - CONNECT TO RSNS1 KELVIN SENSE FOR SNS+/- 1. ALL RESISTORS ARE IN OHMS, 0603. 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. 5 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 4 3 TITLE: SCHEMATIC HIGH CURRENT SINGLE OUTPUT SYNCHRONOUS STEP-UP SUPPLY SIZE 2. ALL CAPACITORS ARE IN MICROFARADS, 0603. 3. INSTALL SHUNTS AS SHOWN. TECHNOLOGY A.K GORAN P. 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. LTC3786EMSE REV. 2 DEMO CIRCUIT 1641A Wednesday, August 25, 2010 SHEET 1 1 OF 1 A