5 4 3 2 1 REVISION HISTORY TP9 VDD25 GND VDD25 GND TP2 2 2 VDD33 C9 1uF VDD33 Q3 0 C48 4.7uF 5 8 SYNC 11 ALERTB 26 ITH1 5 ITH0 28 TSNS1 40 TSNS0 25 ITH0 VSENSE0+ TSNS1 VSENSE0- 10 1 2 3 22 33 ISNS0- SW0 36 BG0 R13 6 ISNS0+ ISNS0- 1 VSENSE0+ 2 VSENSE0- 23 MMBT3906LT1G C38 + C10 330uF D3L 6.3V 24 SHARE_CLK 16 17 R42 10K 18 19 VDD33 20 21 BOOST1 SHARE_CLK SW1 Q1 BG1 ASEL0 ISNS1+ ASEL1 ISNS1VOUT0_CFG VSENSE1 C43 + 330uF D3L OPT 6.3V C42 + 330uF D3L OPT 6.3V GND R25 0 GND_SNS VIN R76 30 TG1 31 BOOST1 29 + C29 330uF D3L 6.3V * 4 WP TP4 TP16 RUN1 TG1 100uF 1210 C1 SW1 BG1 3 ISNS1+ 4 ISNS1- C18 22uF C27 22uF J5 GND 100nF VOUT1 VOUT1 L1 R10 2 Q7 OPT * J6 * VOUT1 2512 8 C24 C32 R1 4 * R7 R6 * * R30 * R9 0 C20 100uF 100uF 1210 1210 ADJ., MAX 25A 100uF 1210 TP3 BSC010NE2LSI VSENSE1 C TP20 GND 5 6 7 1 R56 0 2 32 27 ADJ., MAX 25A VOUT0_SNS * BSC050N02LS TSNS0 RUN0 R8 0 J4 R14 VSENSE0+ C23 * * * * 7 100uF 1210 100uF 1210 R34 R29 * J3 VOUT0 C25 C34 C22 10 14 RUN0 R5 OPT BG0 ISNS0+ BOOST0 39 1 2 3 15 RUN1 MMBT3906LT1G R45 0 LTC3887EUJ ITH1 37 R15 * VOUT0 * 2512 VSENSE0- C14 10nF Q6 SW0 TG0 5 C12 10nF Q5 ALERT BOOST0 U1 SYNC 38 R16 Q2 VOUT1_SNS 1 2 3 C SDA TG0 VOUT0 * Q8 OPT 3 * L2 5 10 SDA R4 * SCL D 8 VOUT1_CFG FREQ_CFG GPIO1 PHAS_CFG GPIO0 GND VDD25 R11 13 * + C11 330uF D3L 6.3V C21 12 * PGND C15 47pF R3 9 SCL 1210 R2 VDD33 * INTVCC C16 47pF C7 1210 22uF 2 BSC010NE2LSI Q4 4 VIN C8 3300F 22uF C28 5 6 7 1 100nF R39 10K VDD25 * R40 10K 35 R69 R57 10K C19 4 C2 R59 2 R41 10K 01-20-16 VIN BSC050N02LS R71 GND DATE YS 9 C17 0.22uF 4 2 APPROVED OPT 3 C35 C36 OPT 1210 PRODUCTION D1 1 2 3 J2 D2 1 C3 C6 OPT 1210 C13 150uF 35V + 7V - 14V DESCRIPTION 2 EXTVCC_DRV C5 4.7uF 0805 VDD25 VIN REV __ R60 INTVCC R52 ECO TP24 VIN J1 D INTVCC/EXTVCC TP7 1 VIN TP25 9 TP23 4 VDD33 TP1 5 GND R12 C4 * + C30 330uF D3L 6.3V C45 + 330uF D3L OPT 6.3V C44 + 330uF D3L OPT 6.3V * R26 * VSENSE0+ R18 OPT R32 OPT R67 OPT R73 OPT R74 OPT 34 R17 OPT B 41 VDD33 B R43 10K R44 10K R24 OPT R23 OPT R22 OPT R21 OPT R20 OPT R19 OPT SGND AND PGND CONNECTED AT A SINGLE NODE NEAR U1 GPIO0B GPIO1B SGND TP10 CURRENT SENSE CONNECTIONS VOUT0 VOUT1 R38 R46 A * * R49 * R50 * * CONFIGURATION -A: DUAL OUTPUT RSENSE U1 3887EUJ#10C9 -B: DUAL PHASE DCR SENSE 3887EUJ#10CA R1,R2 R7,R15 OPT OPT 845 0 R6,R29 R10,R16 R11,R13 R30,R34 0 OPT 0.001 0 R12,R14 C21,C22 C4,C38 100 100 1nF OPT 0 845 0.22uF 1uF R3 R4 C7 3300pF 3.32K OPT OPT CUSTOMER NOTICE 0.22uH OPT OPT OPT OPT OPT OPT OPT OPT OPT OPT OPT OPT OPT 0 0.19uH 0 OPT OPT OPT OPT OPT OPT OPT OPT OPT OPT OPT OPT APPROVALS TECHNOLOGY LT YS TITLE: SCHEMATIC SIZE THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 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 DUAL-PHASE/DUAL OUTPUT STEP-DOWN DC/DC CONVERTER WITH POWER SYSTEM MANAGEMENT N/A 1. ALL RESISTORS AND CAPACITORS ARE 0603. 5 R38,R46,R49,R50 R17 R24 R18 R23 R32 R22 R67 R21 R73 R20 R74 R19 OPT 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. NOTE: UNLESS OTHERWISE SPECIFIED L1,L2 R26,R69 6.49K 6.49K SCALE = NONE 2 DATE: IC NO. LTC3887EUJ REV. 2 DEMO CIRCUIT 2263A Wednesday, January 20, 2016 SHEET 1 1 OF 2 A 5 4 3 2 1 ALL PARTS ON THIS PAGE ARE FOR DEMO BOARD ONLY, NOT NEEDED IN CUSTOMER DESIGN TP11 GPIO1B SDA SHARE_CLK SCL SYNC GPIO1B JP1 TP22 TP5 TP6 TP19 TP21 3 SYNC D ALERTB SDA SCL 2 ALERTB R77 OPT 1 R84 OPT C NC GPIO0-GPIO1 SHARE_CLK TP12 D GPIO0B R79 0 GPIO0B R82 OPT D7 OPT D6 OPT TP14 RUN0 R80 0 100nF R36 4.99K U2 2 3 4 A1 WP A2 SCL VSS SDA RUN1 C NC RUN0-RUN1 OPT RUN1 VDD33 R37 4.99K 1 2 3 4 5 6 7 8 9 10 11 12 13 14 J8 DEMO HEADER (M) J7 VIN 7 EEWP 6 EESCL 5 EESDA R28 10K R27 10K SW2 RUN1 ON 3V3 SW1 RUN0 R64 10 5 2 5 C33 10nF VDD33 3 2 2 VIN C R92 OFF DEMO HEADER (F) Q19 TP0101K R63 10 ON OFF R86 OPT 1206 8 AUXVCC TP8 SGND FAULTB CTRL ALERTB SDA SHARE_CLK SCL RESETB AUXP UNUSED UNUSED GND GND 12V 12V 4 1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 6 3 C VCC R81 4 1 FAULTB CTRL ALERTB SDA SHARE_CLK SCL RESETB AUXP UNUSED UNUSED GND GND 12V 12V C31 A0 RUN0 TP13 1 VDD33 TO DC1613A 1 R62 OPT R51 0 R96 OPT 6 3 AUXP SDA GND SCL LGKPWR ALERTB GPIO_1 OUTEN_0 OUTEN_1 GND AUXSCL AUXSDA JP2 3 1 2 3 4 5 6 7 8 9 10 11 12 1 J10 3V3 2 3V3 10K C26 10nF R93 15.8k VIN 24LC025-I/ST R31 OPT R33 OPT TP17 GND 3V3 3V3 2 3V3 R53 200 R54 200 ALERTB B 5 1 1 C54 1uF 0805 GND R68 0.01 2512 8 IOUT TST C40 1uF 2 3 4 5 10K TP15 7 J9 1 2 3 R58 SHDN NC GND GND GND SENSE/ADJ VIN OUTPUT 2 1 1 4 3 C49 4.7uF EXTVCC_DRV Q12 GPIO0B 1 D5 ALERTB RED 2N7002A Q13 1 GPIO1B 1 6 3 OFF 4 2N7002A R55 127 LT1129CS8-5 2 5 3 TP18 2 2 ON 1 U3 Q15 RJK0305DPB PULSE IN D4 GPIO1 GREEN 2 R61 100K 3 VOUT1 D3 GPIO0 GREEN 3 JP3 EXTVCC_DRV R100 OPT DO NOT EXCEED 5% DUTY CYCLE! TP0101K Q14 2 2 VOUT0 DYNAMIC LOAD CIRCUIT B 1 VIN R101 0 NOTE: PULSE OUT 10mV / AMP J11 C41 2.2uF 0805 2 3 4 5 A J12 VOUT0 1 VOUT1 C47 2.2uF 0805 CUSTOMER NOTICE VOUT1 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. 2 3 4 5 1 VOUT0 TECHNOLOGY LT YI S. TITLE: SCHEMATIC DUAL-PHASE/DUAL OUTPUT STEP-DOWN DC/DC CONVERTER WITH POWER SYSTEM MANAGEMENT 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 DATE: IC NO. LTC3880EUJ REV. 2 DEMO CIRCUIT 2263A Wednesday, January 20, 2016 SHEET 2 1 OF 2 A