5 4 3 2 VIN E1 VIN VIN + CIN2 2.2V - 5.5V 47uF 16V E2 D 7343 CIN1 22uF 10V 1206 CIN3 OPT 1206 + CIN4 CIN5 OPT 1206 OPT 7343 R13 10 1% GND E3 D E12 R22 SVIN 0 C8 OPT 1210 ON 2 SDA 7 ALERT 5 WP 4 RUN_MSTR26 JP1 SYNC SVIN 6 1 2 SYNC 25 R29 0 3 4 FCM JP2 E6 R3 OPT 1% R2 0 C6 OPT R1 1k 1% R17 OPT DAOUT 33 FB 35 ITH 34 SS 30 REF 36 37 C2 4.7nF R4 5.49k 1% C1 24 VIN SCL SW SDA LTC3815EUFE SW ALERT SW WP SW RUN_MSTR SW MODE/SYNC SW RT SW CLKOUT SW VCC_SENSE DAOUT VSS_SENSE FB CSLEW ITH RUN_STBY TRK/SS MARGIN REF NC PGLIM 47pF E5 17 SW PGFD R19 0 L1 0.33uH COILCRAFT VOUT XAL6030-331ME U1 R5 OPT R14 OPT PVIN 16 PGOOD 2 CLKOUT 9 1 SVIN MODE DCM 8 3 SYNC SYNC 29 2 JP5 3 OFF E4 OFF SCL PGND ON 1 PGOOD SGND SVIN RUN_MSTR 1 1uF NC 10 E8 SW VOUT 11 13 COUT1 100uF COUT2 100uF COUT3 10uF COUT4 10uF 14 1210 1210 1206 1206 6.3V 18 19 6.3V 6.3V OPT 7343 E9 GND 21 R20 22 10 C 23 32 VSENSE+ 31 VSENSE- 28 C4 VSENSE+ RUN_STBY 51pF 27 1 3 3 12 ON 2 RUN_STBY SW OFF JP3 RUN_STBY 20 SVIN MARGIN R6 0 HIGH 1 2 NOM 3 4 LOW 5 6 JP4 SVIN TRACK 6.3V VOUT 6A MAX + COUT5 R7 10 38 WP R10 10k 1% PVIN ALERT RUN_MSTR R9 10k 1% ASEL R8 10k 1% 39 SDA R12 100k 1% PVIN SCL 15 SVIN PGOOD B SVIN C7 PGOOD C 1 B C3 10nF VOUT SEL E13 JP6 R11 10k 0.1% REF C9 OPT 1210 E11 SGND 1.0V JP7 R18 18K 0.1% 1.8V JP8 R21 OPT ADJ 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 APPLICATION. COMPONENT SUBSTITUTION AND PRINTED APP ENG. CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. A TECHNOLOGY TITLE: SCHEMATIC MONOLITHIC SYNCHRONOUS STEP-DOWN REGULATOR WITH PMBus INTERFACE SIZE THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 4 3 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 IC NO. LTC3815EUFE DEMO CIRCUIT 2065A DATE: Friday, April 10, 2015 SHEET 1 1 REV. 2 OF 2 A 5 4 3 2 1 ALL PARTS ON THIS PAGE ARE FOR DEMO BOARD ONLY, NOT NEEDED IN CUSTOMER DESIGN SDA E14 SDA D SCL ALERT E15 R26 E10 SYNC D OPT SCL R25 ALERT RUN_STBY OPT 3V3 E7 3V3_BIAS R24 RUN_MSTR OPT J1 1 2 3 4 5 6 7 8 9 10 11 12 AUXP SDA GND SCL LGKPWR ALERTB GPIO_1 OUTEN_0 OUTEN_1 GND AUXSCL AUXSDA OPT SCL ALERT FAULTB CTRL ALERTB SDA SHARE_CLK SCL RESETB AUXP UNUSED UNUSED GND GND 12V 12V TO DC1613A C5 100nF U2 2 3 4 VCC A1 WP A2 SCL 8 AUXP 7 R15 4.99k 1% R16 4.99k 1% J3 DEMO HEADER (M) FAULTB CTRL ALERTB SDA SHARE_CLK SCL RESETB AUXP UNUSED UNUSED GND GND 12V 12V J4 C DEMO HEADER (F) 3V3 3V3 6 EESCL R27 200 5 EESDA VSS SDA 24LC025-I/ST 3 B A0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 2 1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 CUSTOMER NOTICE R28 127 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. A TECHNOLOGY 5 4 3 A MONOLITHIC SYNCHRONOUS STEP-DOWN REGULATOR WITH PMBus INTERFACE IC NO. LTC3815EUFE DEMO CIRCUIT 2065A 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 TITLE: SCHEMATIC SIZE THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. Q1 SI2365EDS1-GE3 D2 RED Q2 2N7002 1 1 B D1 GREEN 2 PGOOD ALERT 3 C R23 AUXP SDA DATE: Thursday, April 09, 2015 2 SHEET 2 1 REV. 2 OF 2