C D E On B Off A JP1 Run 4 1 2 3 4 E2 R5 100k R1 536k 1% 3 PG RUN/SS 2 FB VIN R2 102k 1% DA 10 R3 16.2k 1% R4 40.2k 1% 4 VC RT AGND 13 C5 470pF 50V 2 C1 2.2uF 50V + E1 CIN 10uF 63V E4 12 VIN 6.9V - 36V Transient to 60V GND 7 D1 MBRM140T3 SW GND 1 VIN C6 0.1uF 50V 9 exposed pad, solder side 3 R6 200k 2 VOUT R7 10 U1 LT3682EDD 8 BOOST 6 BD 5 SYNC 11 3 L1 10uH VOUT 1 PGOOD C4 0.22uF 16V C2 10uF 10V C3 0.47uF 10V E3 1A, VIN > 12V 0.9A, VIN > 6.9V E5 C7 220pF 50V E6 JP2 Mode Fixed Freq Burst Mode Sync VOUT 5V GND SYNC 2 1 2 3 4 LOAD CAPABILITY SYNC = 0V SYNC > 0.8V or CLOCKED VIN > 12V 1A 0.8A VIN > 6.9V 0.9A 0.7A LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY Customer Notice 1 A B 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. C LINEAR TECHNOLOGY CORPORATION 1630 McCARTHY BLVD. MILPITAS, CA. 95035 PHONE (408) 954-8400 FAX (408) 434-0507 Title 1A Size A Power Step-Down Switching Regulator Document Number Demo Circuit 1222A Date: Monday, January 05, 2009 D www.linear.com Rev A LT3682EDD Sheet 1 E of 1 1