1 2 3 4 5 6 7 8 REVISION HISTORY ECO REV _ 2 INTVCC JP5 CLKIN 1 535kHz 1 2 3 4 5 6 100K FCM PS/SYNC BURST PRODUCTION APPROVED DATE DING L. 1-31-14 C62 1000pF R48 MODE E1 DESCRIPTION INTVCC 2 PROGRAM 3 A VIN2 R72 OPT U1 VOUT1 5 1% 68.1K VFB2 18 R43 649K 1% C55 R70 0 OPT VFB3 VFB1 VFB2 VFB3 SW1 0 C41 1% 0 1% R79 OPT 1% BOOST1 BG1 1500pF ITH1 4 S1+ C42 C43 ITH2 C44 2.2nF R35 0.1uF 19 Q2 BSZ123N08NS3G DRVCC VBIAS BG1 R94 0 1 2 VBIAS 28 C11 4.7uF D7 VIN2 SW2 BG2 0 SS1 37 SS2 21 SS3 TRK/SS1 SENSE2+ TG2 24 BOOST2 25 BG2 17 S2+ 5 6 7 8 5 6 0.1uF C52 TRK/SS2 E32 7 SENSE2- 16 EXTVCC R26 RUN2 14 15 RUN3 RUN1 30 BOOST3 R96 0 RUN3 SW3 32 1 SW3 RUN3 ON C R99 OPT 6V DRVSET JP8 C60 OPT 2 OFF 2 3 VBIAS 1 3 SENSE3+ PGND BG3 31 TG3 29 BG3 4 C64 1uF COUT6 2.2uF 100V 1210 D5 4 COUT7 2.2uF 100V 1210 COUT8 2.2uF 100V 1210 COUT9 2.2uF 100V 1210 10V / 5.5A * + COUT10 33uF 63V E25 GND OPT E27 VL3- RSNS1 0.006 VIN+ VIN L3 1.2uH J7 VSW3 Q10 BSC042NE7NS3G Q11 OPT 4 C63 C56 VOUT3 Q8 BSC042NE7NS3G VIN R82 OPT CIN6 2.2uF 100V 1210 RSNS2 0.006 CIN7 2.2uF 100V 1210 CIN8 OPT. 100V 1210 CIN9 OPT 1210 CIN1 + CIN2 33uF 63V ** 2.5V - 60V J8 4 1 2 3 RUN3 INTVCC 1 10V 39 OPT E26 TG3 S3+ 8 OPT DRVSET INTVCC 12 20 R41 E24 0.1uF 1 2 3 VPRG3 INTVCC C48 SENSE3- 2 JP2 GND Q9 OPT DRVCC 2 C4 OPT 3 8.5V / 3A E14 VOUT3 D8 OPT BOOST3 RUN2 1 OPT 38 ON OFF C36 OPT 1206 2 R28 OPT 5 6 7 8 C38 1 2 3 3 R38 VBIAS 1 + COUT5 68uF 10V 7343 27 5 6 7 8 RUN1 13 JP1 RUN2 COUT4 4.7uF 16V 1206 OPT 2 OFF VOUT3 VOUT2 0.015 Q7-1 R40 0 S3- 9 E33 RUN2 R39 0 EXTVCC RUN1 VBIAS 1 4 S2- E13 RS2 VSW2 OPT 2 TRK/SS3 VOUT3 RUN1 ON L2 6.5uH Q7-2 1 2 3 SS3 Q4 BSZ123N08NS3G 1000pF 0.1uF VOUT2 B GND 1 2 3 OPT VL2- 4 5 6 7 8 R74 C59 OPT. C21 R95 0 23 C15 E23 C51 2.2uF 100V 4 22 3 BOOST2 10nF R73 R5 0 Q3 BSZ123N08NS3G OPT 7 8 TG2 ITH3 5V / 5A OPT GND 1 0.1uF 11 C32 DRVCC C17 R75 3.6K C54 + COUT2 220uF 6.3V 1 2 3 ITH3 C47 OPT COUT1 22uF 6.3V VOUT3 26 ITH2 820pF TRACK / SS2 B VOUT1 0.009 E12 5 6 7 8 C53 R37 VSW1 Q5-1 0.1uF 0 E11 RS1 OPT 4 34 BOOST1 33 1 R34 Q5-2 2 15K E10 VOUT1 L1 4.9uH 35 ITH1 68pF 100pF C2 1 C58 OPT. VL1- 4 TG1 2 R31 15K TRACK / SS1 VIN1 C50 2.2uF 100V D6 OPT OPT OPT 36 R78 R3 R2 3 C20 0.1uF 1% E9 Q1 BSZ123N08NS3G 1000pF VOUT3 VOUT2 R4 0 S1C14 TG1 10 4 FREQ SENSE1+ OPT VOUT2 2 1% C49 R36 VFB1 SENSE1- 5 6 R33 68.1K PLLIN/MODE 3 OPT R32 6 R27 357K 1% 1 C37 R30 0 1 2 3 JP7 FSW R29 0 LTC3899EFE 7 8 1% 5 6 7 8 0 1 2 3 R87 5 6 7 8 4 350kHz 5 6 7 8 A C57 C OPT VIN- OPT 1000pF E30 JP4 R92 OPT R80 0 R81 100 INTVCC R97 0 R45 VSW1 VOUT2 S1+ OPT R98 R47 TG1 VSW1 OPT NOTE: WHEN DCR SENSING IS IMPLEMENTED, SHORT RSENSE1 & RSENSE2. REMOVE R30, R29, R40, R39, R80 & R81 STUFF R61, R62 AND R91 WITH 0 OHMS. CALCULATE R45, R47 & C14, R51, R53 & C15 AND R89, R90 & C56 PER THE DATA SHEET. ALSO REFER TO QSG FOR EXAMPLE. 0 EXTVCC R61 S1- VL1- E31 OPT R51 VSW2 S2+ OPT VSW3 OPT R90 OPT OPT R62 OPT S3+ E34 SGND R91 VL2- OPT VBIAS VIN R85 OPT R86 2.2 VOUT3 BG1 TG2 VSW2 S3- R53 S2- R93 EXTVCC R89 VOUT1 R55 OPT C61 SHT 2 OPTIONAL DCR SENSING BG2 1uF TG3 VSW3 OPT VL3- BG3 D D NOTE: UNLESS OTHERWISE SPECIFIED CUSTOMER NOTICE 1. ALL RESISTORS ARE IN OHMS, 0603. ALL CAPACITORS ARE IN MICROFARADS, 0603. 2. INSTALL SHUNTS AS SHOWN. * OUTPUT 10V ONLY WHEN VIN < 10V, OTHERWISE VOUT3 FOLLOWS VIN. DON'T CONNECT ANY LOAD. ** VIN NEEDS TO BE >4.5V TO START UP. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 1 2 3 4 5 6 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com 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 Fax: (408)434-0507 LTC Confidential-For Customer Use Only HZ TITLE: SCHEMATIC DING L. TRIPLE OUTPUT SYNCHRONOUS STEP-UP/DUAL STEP-DOWN SUPPLY SIZE N/A SCALE = NONE DATE: 7 IC NO. REV. LTC3899EFE DEMO CIRCUIT 1898A Tuesday, November 04, 2014 2 SHEET 1 8 OF 2 VOUT3 VIN1 C70 0.22uF 1 2 3 Q19 OPT VIN2 5 6 7 8 1 2 3 SHT 1 C67 1uF 4 TG2 C68 1uF 1 2 3 5 6 7 8 4 VSW2 Q18 OPT 5 6 7 8 5 6 7 8 4 VIN2 4 1 2 3 4 BG2 1 2 3 BG3 1 2 3 SHT 1 VSW3 Q15 OPT C66 1uF 5 6 7 8 Q17 OPT BG1 Q14 OPT C65 1uF VSW1 4 1 2 3 4 1 2 3 TG3 Q13 OPT VIN1 4 TG1 5 6 7 8 Q12 OPT 5 6 7 8 Q16 OPT 5 6 7 8 C69 0.22uF 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. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. TECHNOLOGY HZ DING L. TITLE: SCHEMATIC TRIPLE OUTPUT SYNCHRONOUS STEP-UP/DUAL STEP-DOWN SUPPLY SIZE 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 IC NO. LTC3899EFE DEMO CIRCUIT 1898A DATE: Tuesday, February 25, 2014 REV. 2 SHEET 2 OF 2