1 2 3 4 5 6 7 8 3 FB1 VIN1 TP3 + C1 33uF 35V GND TP8 R10 24.9K L1 6.8uH IHLP-2525CZ-ER-6R8 C18 100pF D1 DFLS230L C20 0.1uF C24 10uF 6.3V C16 100uF 6.3V PG1 TP13 PG2 C L2 4.7uH IHLP-2525CZ-ER-4R7 PG2 TP14 VOUT2 D5 CMDSH-3 (Opt.) R8 100K D2 DFLS230L SW1 SS1/TRACK1 4 VOUT1 5 exposed pad solder side VC1 PG1 RT/SYNC 16 PG2 SHDN 14 IND2 VC2 13 SW2 SS2/TRACK2 10 VIN2 BST2 C15 220pF R12 61.9K FOR 500kHz B SHDN TP6 C17 22pF R13 31.6K 12 C19 330pF 11 SS2 SS2 D4 CMDSH-3 C21 0.1uF TP2 C25 10uF 6.3V C23 100uF 6.3V GND C22 470pF C R18 (Opt.) FB2 R15 10.0K TP10 TP7 C13 0.47uF VOUT2 1.8V/2A TP5 15 FB2 9 SYNC R22 (Opt.) 18 17 VOUT2 R9 84.5K 19 FB1 8 C14 22pF 20 21 R7 100K BST1 IND1 7 TP9 VIN1 3 6 GND PG1 TP4 U1 LT3510EFE VOUT1 TP1 SS1 D3 CMDSH-3 2 VOUT1 VIN2 SS1 1 3.3V/2A A Combined C12 0.47uF R14 8.06K B Independent 2 C3 2.2uF X7R 50V GND VIN1 4.5V-24V 1 A JP1 VIN VOUT1 R19 (Opt.) R17 8.06K OPTIONAL ABSOLUTE TRACKING VIN2 VIN2 4.5V-24V TP11 + C2 33uF 35V C4 2.2uF X7R 50V LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY GND TP12 1 2 LINEAR TECHNOLOGY CORPORATION Customer Notice D 3 4 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 D 1630 McCARTHY BLVD. MILPITAS, CA. 95035 PHONE (408) 954-8400 FAX (408) 434-0507 Title Dual Monolithic Step-Down DC/DC Converter 6 Size Document Number Date: Friday, September 08, 2006 Rev Demo Circuit 1157A LT3510EFE 7 Sheet 1 of 8 A 1