1 2 3 4 5 6 7 8 REVISION HISTORY ECO REV DESCRIPTION 2 A EDWIN L. DATE 8-18-10 A C1 +10uF 100V SANYO E2 C2 4.7uF 50V 1 E1 R1 100K 0603 2 GND APPROVED VIN VIN 4.5V - 36V 70V TRANSIENT PRODUCTION D1 SOD323 (OPT) R2 (OPT) TRK/SS1 C4 1nF SS2 7 E5 14 VOUT1 R4 0.1 1206 3 R6 0 E9 C12 2.2uF 16V C17 (OPT) 16V VOUT1 3.3V / 1.7A B 15 E8 C10 330pF VC1 R3 34.0K 19 LIM2 DRV2 C8 (OPT) C7 47uF 16V 1210 R7 41.2K 16 GND R5 10.0K C11 (OPT) R9 0.1 1206 R8 23.2K 8 E10 LIM3 11 3 2.5V / 450mA GND FB1 VOUT1 E6 2 VOUT2 9 L1 4.7uH IHLP-2525CZ-01-4R7 20 TRK/SS3 DA 1 Q1 ZXTCM322 C5 0.22uF 16V D2 B340A C9 1nF 10 18 TRK/SS2 SW E7 B 17 1 BST C6 1nF SS3 C3 0.22uF 16V BIAS 6 E4 2 * VIN SS1 U1 EN/UVLO EN E3 FB2 R10 10.0K DRV3 12 R11 1 Q2 ZXTCM322 2 0 E11 3 E12 R12 PGOOD R13 14.0K * R14 100K C C13 2.2uF 16V SYNC(CLKOUT) VOUT1 FB3 4 E14 5 PGOOD RT VOUT3 1.8V / 450mA GND C R15 10.0K 21 R16 51.1K E13 13 GND * (Fsw = 800KHz) NOTE: UNLESS OTHERWISE SPECIFIED 1. ALL CAP AND RES ARE IN 0402. VIN FB1 FBMJ3216HS800 L2 22uH VIN IHLP-4040DZ-01-220 C16 C14 0.01uF 0603 D C15 4.7uF 50V +10uF 100V SANYO 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. OPTIONAL CIRCUIT * ASSY U1 -A LT3694EFE -B LT3694EFE-1 R12 10K OPEN CUSTOMER NOTICE E12 SYNC CONTRACT NO. APPROVALS PCB DES. EDWIN L. ENG. SIZE CLOCKOUT 2 3 4 5 TITLE: SCHEMATIC MONOLITHIC STEP-DOWN REGULATOR WITH DUAL LDO N/A THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 1 TECHNOLOGY HZ 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only DATE: 6 IC NO. LT3694 FAMILY DEMO CIRCUIT 1541A-A/B Thursday, November 11, 2010 7 SHEET 8 REV 2 1 OF 1 D