A B C D E REVISION HISTORY VIN ECO REV C4 IS FOR DEMO BOARD TEST ONLY VIN 2.2 C36 2.2uF 100V + C4 100uF/63V R31 IntVcc OPT SYNC C6 0.1uF R24 100k Vout2 5 Vout1 R28 0 Ohm EXTVCC Mode/PLLIN 27 R25 OPT IntVcc R1 MODE 100k (OPT) GND 1 6 BURST 3 PGOOD1 PGND 21 IntVCC 19 JP1 ExtVcc Vout1 C21 4.7uF 16V 12 C13 470pF ITH1 1 R10 20K 13 ITH2 C10 1nF C11 100pF OPT 14 RUN2 R20 9 0 Ohm 10 TK/SS2 TK/SS1 RUN1 8 Sense1- 4 RUN2 Sense2- 28 RUN1 0 Ohm C12 2.2pF 11 Sense1+ Sense2+ 3 R21 VIN R14 VIN 100 16 SW2 SW1 25 BG1 23 Boost1 24 TG1 4 Q1 RJK0651DPB 17 Boost2 D6 OPT 4 R30 2 4 Q4 RJK0651DPB D5 VOUT1 1 2 3 2 E6 C16 470uF/6.3V R29 2 IntVcc C25 0.1uF Q6 OPT Vout1 L1 4.7uH BG1 5 BG2 RS1 0.008 4 C18 0.1uF D3 OPT 4 1 2 3 18 SGND 3 2 1 BG2 3 2 1 E4 26 7 C24 10uF GND TG1 3 2 1 C23 1uF TG2 L2 8.0uH 5 + 15 5 8.5V @ 3A TG2 RJK0651DPB 0.01 C2 2.2uF 100V 5 5 100 4 Q3 C1 330uF/10V C7 0.01uF R13 C20 2.2pF RS2 3 R7 OPT C19 0.01uF C3 2.2uF 100V 31.6k R6 OPT R17 OPT C9 OPT R12 Vout2 C14 OPT R16 3 2 R15 34.8K Vout1 10.5k VFB1 3.3V @ 5A + 5 R11 VFB2 Q2 RJK0651DPB C15 10uF C17 1uF GND 1 2 3 C8 OPT E7 0 100k 100k VOUT2 R5 R9 R8 Vout2 E5 FCM 2 E10 R33 OPT 0 4 41.2K IntVcc 20 R4 E3 IntVcc 1K R_PROG LTC3890EGN-1 Vin E9 Vout2 R32 U1 FREQ E2 22 C35 2.2uF 100V PGOOD 2 DATE VICTOR KH. 10-05-09 R3 C34 2.2uF 100V 4 APPROVED PRODUCTION IntVcc E1 4.5V UP TO 60V GND DESCRIPTION 4 Q5 OPT E8 D4 DFLS1100 DFLS1100 VIN 1 NOTE: FOR SKIP MODE OPERATION INSTALL R1 AND REMOVE JP1 RUN1 1 ON 2 R22 JP4 R26 OPT 1 ON RUN1 3 OFF RUN2 OPT C32 OPT 2 R23 1 Meg CUSTOMER NOTICE RUN2 3 OFF JP3 R27 C33 OPT OPT CONTRACT NO. 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. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. A B C D APPROVALS TECHNOLOGY PCB DES. ANTONINA K. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 LTC Confidential-For Customer Use Only ENG. VICTOR KH. TITLE: SCHEMATIC LOW QUIESCENT CURRENT DUAL OUTPUT HIGH VOLTAGE STEP-DOWN CONVERTER SIZE A DATE: IC NO. REV LTC3890EGN-1 4 DEMO CIRCUIT 1244A Wednesday, March 03, 2010 SHEET E 1 OF 1 1