5 4 R1 VIN RUN1 2 20K E3 ON 1 REVISION HISTORY REV __ 2 DESCRIPTION APPROVED DATE PRODUCTION HAORAN W. 11-12-13 PHASMD1 JP2 INTVCC1 120 90 60 DEG DEG DEG 1 4 PLLIN RUN1 5 C1 OPT 2 VIN 3 2 RUN1 4 1 SW1 RUN1 R2 OPT 2 ECO 3 E1 3 MODE JP1 PS BM CCM 1 4 INTVCC1 R3 OPT E4 VIN+ OFF 6 3 D OPT C19 PGOOD 1 VO1_SNS+ 1 2 3 5 6 7 8 R18 2.2 EXTVCC C13 1uF 0 C18 21 TG2 INTVCC1 Q2 BSC010NE2LSI 4 VIN 0.25uH 744301025 DCR = 0.32m OHM COUT3 100uF 6.3V 1210 COUT1 100uF 6.3V 1210 + COUT2 330uF 2.5V 7343 J3 VOUT1 1.0V / 90A + COUT4 330uF 2.5V 7343 J4 GND C INTVCC1 VO1_SNS- R20 10 VIN C14 4.7uF 10V D2 R23 22 VO1_SNS+ 1 2 3 CMDSH-3 BG1 23 CIN4 10uF 1210 Q3 BSC050NE2LS INTVCC1 CMDSH-3 4 0.1uF E8 VO1_SNS- CIN5 10uF 1210 L2 SW2 R28 2 2 5 6 7 8 D1 25 20 R16 10 VOUT1 5 6 7 8 BG2 INTVCC1 4 100K Q4 BSC010NE2LSI COUT7 100uF 6.3V 1210 0.25uH 744301025 DCR = 0.32m OHM COUT8 100uF 6.3V 1210 COUT5 + 330uF 2.5V 7343 VOUT1 COUT6 + 330uF 2.5V 7343 1 2 3 220nF SW2 R17 0 26 24 GND VIN- VOUT1 19 SGND/PGND TG2 27 J2 E7 L1 0.1uF TG1 28 VIN 4.5V - 14V E6 R12 715 1% C7 30 29 + 5 6 7 8 32 33 31 CLKOUT PHASMD 34 RUN1 MODE/PLLIN ILIM TCOMP1 TRSET1 35 36 37 38 SNS2- R27 R31 OPT EXTVCC TRSET1 TCOMP1 39 BOOST2 ENTMPB 41 BG2 SNSA2+ 18 C16 220nF TK/SS2 ENTMPB1 R22 OPT 10 VOSNS2- IFAST 9 EXTVCC RUN2 8 INTVCC VOSNS2+ 17 TK/SS1 ITH2 16 7 BOOST1 VIN IFAST1 6 VO1_SNS- TG1 BG1 RUN1 VFB1 SW1 CIN2 10uF 1210 R11 3.57k 1% Q1 BSC050NE2LS 4 SW1 ITH1 FREQ C U1 LTC3875EUJ VOSNS1- 15 5 VOSNS1+ CIN3 10uF 1210 CLKOUT1 TRSET2 4 VIN ILIM1 14 3 ITH1 INTVCC1 CIN1 270uF 16V + 3.01K R10 1K TRSET2 C9 220pF TAVG R15 2K 1% 13 2 TK/SS1 TAVG1 1 TK/SS1 SNS1- ITH1 SNSD1+ C6 OPT 220nF 12 R14 20k 220nF VFB1 SNSA1+ C5 OPT R9 R7 OPT C4 40 VO1_SNS- R13 13.3k CIN18 270uF 16V 1 2 3 R8 OPT C3 VO1_SNS+ C8 4.7nF R5 OPT TCOMP2 C2 0.1uF 11 0 R6 OPT SNSD2+ TRK/SS1 TCOMP2 TK/SS1 R4 1 VIN E5 E12 TAVG1 EXTVCC R32 100K 1% R34 3.57k 1% R35 715 1% C22 1uF E13 B D J1 GND B E14 PGOOD1 PGOOD1 JP3 ENTMPB1 1 2 OFF R40 10k 2 2 2 RN1 OPT R41 OPT RN6 OPT C24 OPT SW1 R42 OPT RN2 OPT BG1 1 C26 OPT RN5 OPT C23 OPT 1 R43 4.99k OPT 3 ON R39 OPT TG1 1 TAVG1 TCOMP2 R38 OPT 2 TRSET2 TCOMP1 R37 10k 1 TRSET1 IFAST1 R33 TG2 SW2 BG2 A TG1 SW1 BG1 TG2 SW2 BG2 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. TECHNOLOGY HZ HAORAN W. TITLE: SCHEMATIC HIGH EFFICIENCY HIGH CURRENT POLYPHASE SYNCHRONOUS BUCK CONVERTER WITH VERY LOW DCR INDUCTOR SIZE THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 4 3 2 B 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 DATE: IC NO. REV. LTC3875EUJ 2 DEMO CIRCUIT 2055A Tuesday, April 15, 2014 SHEET 1 1 OF 3 A 4 3 2 120 90 60 DEG DEG DEG 1 4 RUN1 2 CLKOUT1 1 CLKOUT PHASMD2 INTVCC2 3 5 E29 JP6 D D VOUT1 5 6 7 8 5 6 7 8 COUT20 100uF 6.3V 1210 + COUT14 330uF 2.5V 7343 + COUT16 330uF 2.5V 7343 1 2 3 VIN C INTVCC2 VIN C60 4.7uF 10V R82 0 21 20 SW2 TG4 D4 CMDSH-3 C43 0.1uF CIN16 10uF 1210 INTVCC2 CIN15 10uF 1210 E27 R79 OPT VO2_SNS+ Q14 BSC050NE2LS 4 VO2_SNS+ L4 SW4 BG4 R87 INTVCC2 4 100K Q15 BSC010NE2LSI 0.25uH 744301025 DCR = 0.32m OHM COUT19 100uF 6.3V 1210 COUT15 100uF 6.3V 1210 R92 OPT R99 TAVG2 100K 1% R86 3.57k 1% J14 VOUT2 VOUT2 5 6 7 8 19 PGOOD ENTMPB 18 RUN2 IFAST 17 16 15 FREQ TRSET2 C56 1uF Q13 BSC010NE2LSI 4 COUT13 100uF 6.3V 1210 COUT17 COUT18 + 330uF + 330uF 2.5V 2.5V 7343 7343 VOUT2 UP TO 30A J16 GND 1 2 3 220nF 1 2 3 32 33 31 CLKOUT PHASMD 34 RUN1 38 37 TCOMP1 SNSPDC1 39 C44 OPT TK/SS2 2.2 22 TG2 ENTMPB2 R63 OPT C38 0.1uF IFAST2 R65 OPT 14 R96 R64 0 TRK/SS2 SGND/PGND TAVG 41 25 EXTVCC BOOST2 SNSN2 TRSET4 E33 SNSPAC2 10 C62 220nF R62 VOUT1 0.25uH 744301025 DCR = 0.32m OHM 23 BG2 13 VO2_SNS- R97 OPT C55 OPT R84 OPT TK/SS2 9 TAVG2 VO2_SNS+ C54 OPT INTVCC2 CMDSH-3 BG3 26 24 EXTVCC VOSNS2- 8 TK/SS2 R83 OPT VIN D3 5 6 7 8 7 27 INTVCC VOSNS2+ R60 0 28 BG1 ITH2 6 VFB2 TG1 L3 TG3 1 2 3 5 ITH2 ITH2 TCOMP2 C58 OPT 12 R88 OPT 29 BOOST1 ITH1 C42 0.1uF 30 SW1 R70 715 1% Q16 BSC050NE2LS 4 SW3 R77 CIN14 3.57k 10uF 1% 1210 CIN13 10uF 1210 CLKOUT U3 LTC3875EUJ VOSNS1- 4 ITH1 C VOSNS1+ 3 VO1_SNS- C57 220pF TK/SS1 TCOMP4 2 SNSN1 VFB1 SNSPDC2 1 11 TK/SS1 SNSPAC1 40 ITH1 VIN ILIM2 MODE/PLLIN 220nF C63 OPT TRSET3 220nF VIN INTVCC2 3.01K R81 1K 35 C52 TCOMP3 C46 R80 R93 OPT ILIM OPT 36 R94 TRSET1 R91 OPT VO2_SNS- E28 R68 OPT R85 715 1% VO2_SNS- E23 RUN2 B B E24 PGOOD2 PGOOD2 JP4 ENTMPB2 1 OFF IFAST2 R69 2 TCOMP3 R78 10k TCOMP4 R74 OPT RN8 OPT 2 R75 OPT RN3 OPT RUN2 SW2 RUN2 ON R89 OPT 5 OFF SW3 VIN 4 1 R73 OPT 2 2 RN4 OPT TG3 C49 OPT 1 C37 OPT C48 OPT 1 RN7 OPT 1 R44 4.99k 1 TAVG2 OPT R76 OPT R101 10k 2 TRSET4 3 ON 2 C59 OPT R90 OPT BG3 TG4 SW4 6 3 TRSET3 BG4 A TG3 DUAL-OUTPUT CONFIG SW3 BG3 R83 R84 R88 VOUT2 = 1.5V 30.1k 20k 10k R85 R79 R68 931 0 0 BG4 APPROVALS TECHNOLOGY HZ HAORAN W. TITLE: SCHEMATIC THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 2 B 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 HIGH EFFICIENCY HIGH CURRENT POLYPHASE SYNCHRONOUS BUCK CONVERTER WITH VERY LOW DCR INDUCTOR SIZE 3 L4 SW4 CUSTOMER NOTICE 4 C58 TG4 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 R86 1.5nF 0.33uF/0.32mOHM 4.64k 744301033 DATE: IC NO. REV. LTC3875EUJ 2 DEMO CIRCUIT 2055A Tuesday, April 15, 2014 SHEET 2 1 OF 3 A 5 4 3 2 1 REMOVE ZERO OHM JUMPERS FOR DUAL-OUTPUT OPERATION VFB2 0 R51 R53 0 R54 TAVG2 0 6 R52 10K + 8 COUT9 330uF 7343 + COUT10 330uF 7343 C29 100uF 6.3V 1210 TG4 8 1 5 4 3 2 + COUT12 330uF 7343 C33 100uF 6.3V 1210 C34 100uF 6.3V 1210 C35 0.22uF Q8 RJK0305DPB J10 IOUT2 1 C36 0.22uF 5 4 3 2 9 7 GND J9 VOUT2 2 3 4 5 COUT11 330uF 7343 8 6 E17 B + Q10 FDMS3620S OPT 5 5 6 7 9 9 7 R55 10K R56 0.005 2512 1 BG4 6 C32 0.22uF IO1STEP_CLK VOUT2 4 3 2 1 8 5 1 C VOUT1 E16 4 Q7 RJK0305DPB E18 4 R57 10K 3 2 1 Q18 FDMS3620S OPT C31 0.22uF CIN8 OPT 2 3 4 4 3 CIN12 OPT C30 100uF 6.3V 1210 9 5 5 6 7 9 9 7 5 6 VIN CIN9 OPT J7 1 VOUT1 IOUT1 BG3 5 5 2 3 4 5 1 BG2 Q9 FDMS3620S OPT TG3 1 1 8 6 BYP 4 C28 10uF 16V 5 8 2 2 3 CIN17 OPT 4 GND 2 R50 34.8K 1% 3 2 1 TG2 4 2 1 8 5 6 7 7 ADJ D OPT 3 5 1 VIN SW3 NC SHDN 2 LOAD STEP CIRCUIT 1 Q6 FDMS3620S OPT SW2 7 OUT EXTVCC R47 1 Q12 FDMS3620S OPT SW1 9 OUT IN NC 8 J8 Q17 FDMS3620S OPT IN +5.5V 1 CIN7 OPT 2 3 4 4 3 CIN11 OPT 3 CIN6 OPT BG1 B NC VIN 7 TG1 8 9 9 R49 10K NC OFF 6 1 R61 TAVG1 10 JP5 BIAS ON VIN Q5 FDMS3620S OPT 2 3 4 0 RUN2 CIN10 OPT C R72 0 OPTIONAL 5mm x 6mm Dual-MOSFETs Q11 FDMS3620S OPT 11 C27 10uF 16V 0 TK/SS2 RUN1 12 VIN R67 ITH2 TK/SS1 VIN 0 0 ITH1 U2 LT1763CDE OPTIONAL 5.5V BIAS R66 VO2_SNS- 2 D VOUT2 0 13 R48 VO1_SNS- R59 VOUT1 GND 0 3 R46 VFB1 IO2STEP_CLK E19 GND R58 0.005 2512 SW4 LOAD STEP CIRCUIT 2 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. A THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 4 3 APPROVALS PCB DES. APP ENG. TECHNOLOGY HZ 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only HAORAN W. TITLE: SCHEMATIC HIGH EFFICIENCY HIGH CURRENT POLYPHASE SYNCHRONOUS BUCK CONVERTER WITH VERY LOW DCR INDUCTOR SIZE B SCALE = NONE 2 DATE: IC NO. REV. LTC3875EUJ 2 DEMO CIRCUIT 2055A Tuesday, April 15, 2014 SHEET 3 1 OF 3 A