5 D 4 3 2 1 REVISION HISTORY This circuit is proprietary to Linear Technology and supplied for use with Linear Technology parts. Customer Notice: Linear Technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customers 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 Applications Engineering for assistance. ECO REV DESCRIPTION DATE APPROVED 1 PROTO 01/23/06 2 Changes 09/20/06 D U1 LT3503EDCB C 2 63V C2 RUN 1uF 1 25V SHDN 3 JP1 1% E9 0.1uF SW 4 L1 D1 2 GND CMDSH-4E 2 C3 R3 100K GND 6 SHDN D2 1 BOOST 3 FB 1 2 + 10uF 2 4.5V - 20V C9 5 VIN E3 2.2uH 1 E1 1 VIN SUMIDA CDRH4D15/SNP-2R2NC MBRM130T3G 3.3V [2] C1 22uF C7 R1 22pF 36.5K 0.1uF C E4 1% C11 VOUT GND R2 11.3K 1% B B NOTES: UNLESS OTHERWISE SPECIFIED, [1] DO NOT STUFF. [2] VIN (V) 5.5V A 8.5V CONTRACT NO. IOUT (A) APPROVALS DRAWN 1A MEI DATE 01/23/06 CHECKED SCH, LT3503EDCB, 1.2A, 2.2MHz STEP-DOWN SWITCHING REGULATOR IN 2mmX3mm DFN APPROVED 1.2A ENGINEER DESIGNER Friday, September 29, 2006 5 TECHNOLOGY TITLE 4 3 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 SIZE CAGE CODE SCALE: DWG NO FILENAME: 2 1050A-2.DSN REV DC1050A SHEET 2 1 1 OF 2 A