5 4 3 2 1 REVISION HISTORY ECO REV __ 1 VIN E1 SANYO 50CE22LX R6 20k C5 D4 B340A E10 680pF 7 SW2 SW1 SW2 FB1 FB2 VC1 VC2 TRK/SS1 TRK/SS2 VOUT3 C26 1uF 10V 0603 E14 D9 CMDSH-4E 2 1 L3 10uH C10 47uF 10V 1206 E4 12 E5 R11 20k C11 680pF R12 10.2k D6 B240A C19 47pF 2 GND 32 C9 0.22uF 33 0603 34 20 C18 OPT E16 19 BOOST3 BIAS SW3 TRK/SS4 SW3 DRIVE FB3 FB4 VC3 VINSW 18 TRK/SS3 UVLO TRK/SS3 OVLO 27 C2 0.22uF 25V 0603 28 29 E18 SD 23 C6 C15 RUN2 RUN3 C21 0.01UF 0603 C22 2.2UF,50V 1210 + D5 B240A 47pF 21 PGOOD3 E7 C4 22uF,6.3V 1206 R9 10k C16 OPT C25 1uF 10V 0603 VOUT2 [email protected] E9 GND E11 C TRK/SS2 17 26 24 1 25 R23 10k C28 OPT 5 R14 49.9k R17 18.2k VOUT4 Q1 ZXTCM322 4 6 E13 R13 1.07k C29 OPT 1206 C12 2.2uF 0603 C27 1uF 10V 0603 VOUT4 [email protected] E15 GND R16 499 R15 100k E17 B TRK/SS4 R18 3.32k C20 0.1uF E19 SYNC R19 107k (450kHz) VIN C23 22UF,50V SANYO 50CE22LX CUSTOMER NOTICE A NOTES: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTORS ARE IN OHMS, 0402. ALL CAPACITORS ARE 0402. 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 PGOOD2 VOUT2 R20 OPT OPTIONAL CIRCUIT VIN 680pF R7 20k RUN1 U1 LT3507EUHF TAIYO YUDEN VISHAY FB MJ3216HS800 IHLP-4040DZ-01 L4 FB1 22UH BEAD L2 8.2uH 22 RT/SYNC 16 R22 100k B D8 CMDSH-4E R5 31.6k 13 15 GND 14 39 C13 0.1uF VIN PGOOD1 1 E3 C7 0.1uF R10 53.6k 1 VOUT3 E12 [email protected] VOUT2 R3 100k 11 TRK/SS1 C8 0.1uF R2 100k 10 C17 47pF 8 R1 100k VIN3 VIN3 1 36 35 31 PGOOD3 SW1 D 2 37 38 R8 10k BOOST1 BOOST2 9 C14 OPT 30 2 1 2 C PGOOD2 R4 12.4k VOUT2 D3 CMDSH-4E OPT 3 E8 GND C3 47uF 10V 1206 PGOOD1 C1 0.22uF 25V 0603 1 C24 1uF 10V 0603 D7 CMDSH-4E 2 1 L1 4.7uH E6 11-30-10 2 VOUT1 VOUT1 [email protected] DATE EDWIN L. 2 VOUT2 VIN2 VIN1 D2 CMDSH-4E OPT VIN2 D1 CMDSH-4E OPT 3 2 1 D 1 22uF,50V GND APPROVED R21 OPT 0603 + CIN4 VIN1 CIN3 2.2uF 50V 1210 2 E2 CIN2 2.2uF 50V 1210 2 CIN1 2.2uF 50V 1210 1 VIN 7V - 36V DESCRIPTION REBUILD WITH CHANGES 4 3 APPROVALS PCB DES. APP ENG. TECHNOLOGY KT EDWIN L. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only TITLE: SCHEMATIC TRIPLE MONOLITHIC STEP-DOWN REGULATOR WITH LDO SIZE N/A SCALE = NONE 2 DATE: IC NO. REV. LT3507EUHF 1 DEMO CIRCUIT 1161B Tuesday, November 30, 2010 SHEET 1 1 OF 1 A