5 4 3 2 1 REVISION HISTORY INPUT MODE 1 ECO REV SINGLE DESCRIPTION 3 DATE IC Change APPROVED 02/23/11 EDWIN L. 2 CASCADE 3 VOUT1 4 DUAL JP1 VIN2 VIN1 D D TP1 TP16 GND VOUT2 R1 1k 1% VOUT1 D6 CMDSH-4E OPT LT3692AEFE TP3 35 SHDN1 6 D7 OPT 38 C4 0.47uF 0603 D2 D1 SHDN1 D3 CMDSH-4E OPT BST1 BST2 SW1 SW2 SHDN2 20 D4 C5 0.47uF 0603 D5 CMDSH-4E 9 R7 100K R5 42.2K 1% C10 8 22pF 7 34 33 TP9 R9 8.06K 1% CMPO1 32 SS1 30 TP11 C12 R11 R13 30k 1% C14 680pF 0.1uF 27 100K 1% 1 3 C16 33pF 5 10 TP13 B SYNC 15 C25 10nF OPT R15 10.2k 1% R16 20k 1% IND1 IND2 VOUT1 VOUT2 FB1 FB2 CMPI1 CMPI2 CMPO1 CMPO2 SS1 SS2 ILIM1 ILIM2 VC1 VC2 RT/SYNC CLKOUT DIV TJ NC NC NC NC NC NC NC NC NC PGND 4 11 C11 12 22pF BEAD FBMJ3216HS800 OPT L3 R8 100K 13 VOUT2 C8 100uF 10V 1210 C9 10uF 16V OPT 0805 3.3V/3A TP8 24 GND 25 R10 8.06K 1% TP10 26 CMPO2 29 SS2 28 R12 100K 1% R14 30k 1% 37 C13 C15 680pF TP12 0.1uF 31 C17 33pF 21 19 TP14 R18 17 CLKOUT OPT B TEMP C24 R17 40.2k 1% 22uH IHLP4040DZ-01 OPT C20 2.2uF 50V OPT 1210 + C18 22uF 50V OPT OPTIONAL CIRCUIT CUSTOMER NOTICE 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. A NOTES: UNLESS OTHERWISE SPECIFIED, 1. ALL CAPACITORS AND RESISTORS ARE 0402. [2] SEE QUICK START GUIDE FOR DETAILS ON JP1 SETTING AND INPUT VOLTAGE IMPLEMENTATION ORDER. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 R6 24.9K 1% VIN1 FB1 C19 0.01uF OPT 0603 TP6 VOUT2 10nF (400kHz) VIN1 NC C 18 16 TP15 39 2 TP7 R2 1k 1% B340A VOUT1 GND TP17 D8 OPT L2 4.7uH TP5 C7 100uF 10V 1210 7V - 36V 14 L1 6.8uH C C6 10uF 16V OPT 0805 + C21 22uF 50V 23 B340A 5V/3A VIN2 TP4 SHDN2 CMDSH-4E VOUT1 C3 4.7uF 50V 1210 [2] VIN2 GND U1 22 TP2 VIN1 VIN2 C2 4.7uF 50V 1210 36 + C1 22uF 50V 7V - 36V VIN1 [2] VIN1 4 3 APPROVALS PCB DES. APP ENG. TECHNOLOGY MI EDWIN L. TITLE: SCHEMATIC DUAL MONOLITHIC STEP-DOWN CONVERTER 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 IC NO. LT3692AEFE REV. DEMO CIRCUIT 1403A DATE: Wednesday, February 23, 2011 SHEET 1 1 3 OF 1 A