5 4 3 2 1 REVISION HISTORY INTVCC ECO E10 REV CVCC1 1uF CTR1 4700pF TRACK/SS1 2 3 TRACK D E9 02/11/13 1uF TOM G. SS 2 3 TRACK D JP4 E11 RTR2 0 TRACK1 TRACK2 RTR3 OPT RTR4 OPT VIN1 VIN2 RPG1 100K RPG2 100K E1 E8 PGOOD1 PGOOD2 INTVCC PHASE RUN1 SVIN RUN2 1 L1 1.0uH VOUT1 VOUT1 3A COUT5 10uF 6.3V 0805 E6 GND COUT3 22uF 6.3V 1206 COUT1 22uF 6.3V 1206 E15 C1 0.1uF 26 27 VISHAY IHLP-2020BZER1R0M01 28 R3 34.8K 1% CFFW1 10pF 3 R5 23.2K 1% GND 1 1 1.5V 4 3 1.8V 6 R7 17.4K 1% 2.5V 5 JP6 11 PGOOD2 18 19 TRACK/SS2 PVIN2 PVIN2 13 21 2 INTVcc LTC3633AEFE-3 SW1 SW1 SW2 SW2 VON1 VON2 VFB1 VFB2 ITH1 RITH1 13K 1% R2 1M ITH2 ON 2 3 9 R9 11K 1% EXT 2 3 INT VIN1 VIN1 D2 20 17 16 C2 0.1uF 22uF 25V 7343 CIN1 22uF 25V 1210 1MHz VIN1 [1] + CIN6 22uF 25V 7343 VIN2 CIN4 22uF 25V 1210 OPT COUT2 22uF 6.3V 1206 15 R4 84.5K 1% CFFW2 10pF 14 RITH2 13K 1% CC2 10pF OPT 220pF 220pF 3 COUT6 10uF 6.3V 0805 3A E7 GND GND JP15 E14 2.5V ITH2 R6 18.7K 1% 1 2 VOUT2 COUT4 22uF 6.3V 1206 R10 26.7K 1% CITH2 EXT JP5 VO2 SELECT 3.3V INT R8 11.5K 1% JP7 B JP13 5V INTVCC MODE 2 2 1 3 4 3 6 5 INTVCC JP14 RT 324K 1% BURST MODE SYNC E12 SYNC FCM (FORCED CONTINUOUS MODE) JP8 R12 OPT R11 10k CIN2 22uF 25V 1210 CUSTOMER NOTICE NOTES: UNLESS OTHERWISE SPECIFIED, [1] CIN5 AND CIN6 ARE INSERTED ON DC1896A TO DAMPEN THE (POSSIBLE) RINGING VOLTAGE DUE TO THE USE OF LONG INPUT LEADS. ON A NORMAL, TYPICAL PCB, WITH SHORT TRACES, CIN5 AND CIN6 ARE NOT NEEDED. 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. 5 VOUT2 VISHAY IHLP-2020BZER2R2M01 12 CSVIN1 1uF E5 OPT CITH1 VIN2 E16 VIN2 3.6V - 20V 2MHz (INT.) CSVIN 1uF INTVCC L2 2.2uH 1 CIN3 22uF 25V 1210 OPT C E13 INTVCC [1] + CIN5 VIN2 CMDSH-3-TR SVIN FREQ 3.6V - 20V D3 CMDSH-3-TR 23 INTVCC JP12 D4 VIN1 JP2 RUN2 GND SVIN OFF 1 B E2 CC1 10pF OPT ITH1 BOOST2 U1 8 2 BOOST1 RT VO1 SELECT SVIN MODE/SYNC 22 OPT RUN2 PHMODE 7 D1 INTVCC E4 RUN1 PGND 5 29 6 RUN1 TRACK/SS1 JP1 C SGND JP11 4 3 OFF 10 3 2 E3 1 R1 1M 25 24 ON PGOOD1 RPHMDE 1M 2 OFF SVIN PVIN1 PVIN1 1 ON A APPROVED TRACK/SS2 JP3 RTR1 0 DATE PROD 1 INTVCC SS CTR2 4700pF CVCC 1 DESCRIPTION 1 4 3 APPROVALS TECHNOLOGY PCB DES. MI APP ENG. TOM G. TITLE: SCHEMATIC SIZE N/A SCALE = NONE 2 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only DATE: DUAL SYNCHRONOUS STEP-DOWN REGULATOR IC NO. LTC3633AEFE-3 DEMO CIRCUIT 1896A 05/03/13 12:32:05 SHEET 1 1 REV. 1 OF 1 A