A B C D E REVISION HISTORY ECO VIN C4 IS FOR DEMO BOARD TEST ONLY VIN E1 APPROVED DATE PRODUCTION VICTOR K. 12-29-14 IntVcc C36 2.2uF 100V 1210 + C4 47uF/63V + C29 OPT R31 IntVcc E2 R24 100k U1 Vout2 Vout1 EXTVCC R33 R4 20 OPT E10 PGOOD1 R25 OPT PGND ExtVcc IntVCC BURST IntVcc 4 R2 GND E5 100K JP1 21 IntVcc Vout1 19 C21 4.7uF 16V C30 1uF 0 MODE 1 2 3 4 5 6 PLS SKIP 6 E3 IntVcc FC PLLIN/MODE 27 Vout2 * 0 C28 OPT 35.7K E9 R28 0 SYNC R18 Vin PGOOD R1 OPT C6 0.1uF 0805 5 C35 2.2uF 100V 1210 FREQ C34 2.2uF 100V 1210 22 4 DESCRIPTION 2.2 6V UP TO 60V GND REV 1 R3 R8 R5 0 R9 100k 12 C13 1800pF C8 OPT R11 R15 20K 13 Vout1 7.15k OPT R17 OPT VFB1 ITH2 ITH1 R10 10K 1 C10 1800pF R12 Vout2 C14 100pF R16 3 VFB2 100k 2 18.7k C9 OPT R6 C11 100pF OPT 3 R7 OPT 14 C19 0.01uF R20 TRACK/SS1 RUN2 10 0 RUN1 Sense2- Sense1- Sense2+ Sense1+ 28 8 11 0 C7 0.01uF RUN1 R13 4 0 C12 1000pF R14 C20 1000pF R21 C5 2.2uF 100V 1210 TRACK/SS2 9 RUN2 3 0 VIN VIN C22 2.2uF 100V 1210 GND 5 Boost2 D2 OPT 4 R30 2.0 4 Boost1 23 Vout1 L1 RS1 5.6uH 0.005 VOUT1 2 E6 BG1 C16 470uF/6.3V 24 R29 2.0 4 D1 OPT 4 1 2 3 C26 OPT 1206 BG1 Q1 RJK0651DPB 25 3 2 1 C24 10uF 1210 3 2 1 C23 OPT SW1 BG2 17 C1 150uF/16V 5 + SW2 18 2.2uF 100V 1210 5V / 8A + 5 16 BG2 12V / 5A TG1 4 1 2 3 15uH TG2 TG1 5 0.008 Q3 RJK0651DPB SGND E7 L2 26 7 VOUT2 2 RS2 15 TG2 3 2 1 Vout2 4 C27 OPT 1206 C15 10uF 1210 C17 OPT 1 2 3 C3 2.2uF 100V 1210 5 5 C2 GND IntVcc E4 Q6 OPT Q4 RJK0652DPB C25 D3 0.1uF D4 DFLS1100 DFLS1100 C18 Q2 RJK0652DPB Q5 OPT E8 0.1uF * VIN RUN1 1 1 ON 2 R22 OFF JP3 2 RUN1 R26 OPT C32 OPT CUSTOMER NOTICE RUN2 3 OFF 3 JP2 R27 C33 OPT OPT NOTE: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTORS AND CAPACITORS ARE 0603. 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. B -B LTC3890EGN-1 C APPROVALS PCB DES. APP ENG. TECHNOLOGY LT VICTOR K. TITLE: SCHEMATIC SCALE = NONE D 1630 McCarthy Blvd. Milpitas, CA 95035 www.linear.com Phone: (408)432-1900 Fax: (408)434-0507 1 LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY LOW QUIESCENT CURRENT DUAL OUTPUT HIGH VOLTAGE STEP-DOWN CONVERTER SIZE N/A THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. A LTC3890EGN-3 1 Meg 1 ON U1 -A R23 RUN2 OPT ASSY DATE: IC NO. REV. LTC3890EGN-1 / LTC3890EGN-3 DEMO CIRCUIT 2299A Monday, December 29, 2014 SHEET E 1 1 OF 1