1 2 3 4 5 6 7 8 REVISION HISTORY ECO REV - 2 DESCRIPTION PRODUCTION DATE APPROVED 12/10/15 DL INTVCC INTVCC MODE E7 CLKIN INTVCC A 2 FCM 3 4 PS/SYNC 5 6 BURST R94 OPT E8 R48 100K 1 C62 1nF A JP3 FREQ U1 LTC7813EUH R72 37.4K R109 OPT INTVCC R92 90.9k 10 9 PLLIN/MODE DRVSET 22 R105 0 FREQ INTVCC DRVUV * 6 VFB1 ILIM 18 R78 R79 VBUS * ITH1 5 C44 4.7nF B R35 C53 VBIAS Q1 BSC123N08NS ITH2 20 TG1 ITH2 BOOST1 SW1 27nF SENSE1+ SS1 0 R37 OPT C47 0.1uF INTVCC R46 100K E12 PGOOD1 SS2 3 23 14 SENSE1- EXTVCC BOOST2 1 ON C60 OPT INTVCC 3 R107 OPT JP2 TG2 SENSE2- 1nF R80 0 1nF S1- 4 R39 0 J3 0.008 COUT4 2.2uF 100V 1206 + COUT5 68uF 35V + 28 BOOST2 30 SW2 29 TG2 27 BG2 BG2 GND 1. ALL RESISTORS AND CAPACITORS ARE 0603. 1 2 VBUS VBUS R96 VBUS C4 0.1uF Q21 BSC026N08NS C7 OPT 0805 C1 OPT 1210 C2 OPT 1210 C3 OPT 1210 C6 OPT 1210 C5 2.2uF 100V 1206 COUT6 4.7uF 100V 1210 COUT8 4.7uF 100V 1210 + COUT1 33uF 63V + COUT2 100uF 63V R33 11.5K 9.76K 63.4K R35 7.5K 7.5K 4.99K GND J6 C GND E1 VL2- L2 C63 RS2 VIN * J1 VSW2 OPT Q22 BSC072N08NS R81 100 15uH R82 OPT CIN2 4.7uF 100V 1210 RS3 OPT 4 CIN3 4.7uF 100V 1210 CIN4 4.7uF 100V 1210 CIN5 OPT 1210 + CIN1 33uF 63V J2 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. R101 R102 RS2 L1 OPT 0 6m 22uH OPT 0 6m 22uH 0 OPT 10m 10uH 4 VIN GND VINE2 APPROVALS PCB DES. LT APP ENG. DL TECHNOLOGY 6 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 WIDE INPUT SYNCHRONOUS STEP UP/DOWN SUPPLY SIZE 5 VIN+ 4V -56V C57 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 3 E6 4 OPT R79 14.7K 21K 17.4K * E5 CUSTOMER NOTICE VBUS 28V 20V 24V * GND 25 D ASSY VOUT1 ‐A 24V/5A ‐B 28V ‐C 5V/8A VOUT1 C36 OPT 1206 J4 E4 0 NOTE: UNLESS OTHERWISE SPECIFIED COUT11 68uF 35V R40 0 1 2 3 R108 * VOUT1 RS1 13 C56 C64 4.7uF 2 OFF E3 VOUT1 Q2 BSC042NE7NS S2- VIN INTVCC 15 RUN2 RUN2 SW2 VPRG2 R111 OPT JP1 VL1- VSW1 0 RUN2 GND B SHT 2 C78 OPT 0805 L1 * S1+ RUN1 SENSE2+ 4 VIN 11 E11 8 C79 OPT 0805 C59 OPT 1210 J5 PGND 3 7 VBUS_ C51 OPT 16V 0805 PGOOD1 S2+ 12 2 OFF BG2 2010 BG1 SS2 INTVCC ON RUN2 17 R110 OPT BG1 SHT 2 * C21 0.1uF C15 33 1 C C77 OPT TG2 VIN R101 4 R95 1 31 EXTVCC RUN1 16 VIN BOOST1 TRK/SS1 E10 RUN1 TG1 32 C52 0.1uF RUN1 S2- TG1 1 2 3 R34 2 0 BG1 E9 R102 * 2010 4.7uF 0.1uF R75 3.6K C54 TRACK / SS1 C17 26 ITH1 * 820pF S1- 24 VBIAS 68pF VL2- SHT 2 C81 DRVCC C43 S2+ VL1- INTVCC R104 OPT 332K 0 0 VFB2 5 6 7 8 VOUT1 R70 VSW2 S1+ R103 0 1 2 3 VBUS 19 VFB2 VSW1 VFB1 5 6 7 8 R36 OPT 5 6 7 8 C49 47pF C55 5 6 7 8 R43 332K R106 OPT 1 2 3 R33 21 IC NO. N/A SCALE = NONE DATE: LTC7813EUH DEMO CIRCUIT 2435A SHEET 1 Thursday, December 10, 2015 7 8 REV. 2 OF 2 D OPTIONAL DCR SENSING NOTE: WHEN DCR SENSING IS IMPLEMENTED,SHORT RS1 & RS2. REMOVE R30, R29, R80 & R81.STUFF R62 AND R91 WITH 0 OHMS. CALCULATE R51, R53 & C15 AND R89, R90 & C56 PER THE DATA SHEET. ALSO REFER TO QSG FOR EXAMPLE. SHT 1 VSW1 R51 VSW1 S1+ OPT SHT 1 S1+ SHT 1 SHT 1 VSW2 R89 VSW2 OPT R53 OPT R62 S1- S1- S2- VL1- VL1- SHT 1 S2- SHT 1 R90 OPT R91 S2+ SHT 1 S2+ VL2- VL2- SHT 1 OPT OPT VIN EXTVCC E14 R93 EXTVCC D4 OPT 2 L3 VOUT1 R55 OPT SGND C66 OPT 0805 1 R85 OPT E13 OPT R86 C61 1uF J9 VIN_EMI VIN VBUS VBIAS OPT C65 R100 OPT 0805 OPT C67 OPT 0805 C68 OPT 1210 J10 GND 2.2 VBUS VBUS VSW1 SHT 1 BG1 BG1 4 SHT 1 TG2 SHT 1 VSW2 SHT 1 BG2 VSW2 Q18 OPT CUSTOMER NOTICE BG2 4 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 APPLICATION. COMPONENT SUBSTITUTION AND PRINTED APP ENG. CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. TECHNOLOGY LT DL 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only WIDE INPUT SYNCHRONOUS STEP UP/DOWN SUPPLY N/A SCALE = NONE Q11 OPT TITLE: SCHEMATIC SIZE THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 2 VSW1 1 2 3 SHT 1 4 TG2 1 2 3 C74 OPT 0805 D3 OPT 4 TG1 5 6 7 8 C73 OPT 0805 Q9 OPT 1 2 3 C40 OPT 0805 TG1 5 6 7 8 C39 OPT 0805 SHT 1 1 2 3 VIN 5 6 7 8 Q19 OPT C80 4.7uF 100V 1210 1 VBUS_ 5 6 7 8 SHT 1 DATE: IC NO. LTC7813EUH DEMO CIRCUIT 2435A Thursday, December 10, 2015 SHEET 2 REV. 2 OF 2