1 2 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 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 Applications Engineering for assistance. ECO REV DESCRIPTION 2 A DATE PROTO APPROVED 04/01/05 A U1 LT3021EDH SHDN 3 E4 GND ON VIN VOUT 4 1 NC NC 11 2 NC NC 5 NC 6 NC 9 SHDN VOUT 500mA MAX E2 13 R2 60.4K 1% 0402 R3 100K 1% 0402 R4 130K 1% 0402 R5 162K 1% 0402 R6 OPT 0402 NC 15 JP2 JP3 JP4 JP5 JP6 NC 16 ADJ COUT 10uF 10V + C2 OPT GND E5 7 0.8V 1.2V 1.5V 1.8V USER SELECT R1 20K 1% 0402 1 E3 JP1 2 OFF 14 SGND 10V 3 PGND RSD 100K 1% 0402 VOUT 8 16V CIN 10uF VIN PGND C1 ** + 33uF 12 17 E1 10 * VIN 1V - 10V B B CONTRACT NO. * 1V IS THE MINIMUM INPUT VOLTAGE THAT LT3021EDHC WILL OPERATE AT. THE MINIMUM VOLTAGE FOR A SPECIFIC REGULATOR CIRCUIT DEPENDS ON THE OUTPUT VOLTAGE (PLUS THE DROPOUT VOLTAGE). ** FOR DEMO BOARD PURPOSES ONLY CAPACITOR C1 IS AN OPTIONAL PART. IT WAS INSERTED ON THE DC865A TO DAMPEN THE (POSSIBLE) RINGING VOLTAGE DUE TO THE USE OF LONG INPUT LEADS. ON A NORMAL, TYPICAL PCB, WITH SHORT TRACES, THE CAPACITOR IS NOT NEEDED. APPROVALS DRAWN MEI CHECKED APPROVED ENGINEER DESIGNER Wednesday, May 18, 2005 1 DATE 12/01/04 TECHNOLOGY 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 TITLE SCH, LT3021EDH, LOW VOLTAGE LDO LINEAR REGULATOR SIZE CAGE CODE SCALE: FILENAME: DWG NO 856A-2.DSN 2 REV DC865A SHEET 2 1 OF 1