A B C D E REVISION HISTORY ECO REV DESCRIPTION DATE APPROVED 0 1st PROTOTYPE <DATE> <APPROVED> 4 4 * CIN1 & R4 ARE OPTIONAL COMPONENTS. THEY ARE INSERTED ON THE DC1499A TO DAMPEN THE (POSSIBLE) RINGING VOLTAGE DUE TO THE LONG INPUT LEADS. ON A NORMAL, TYPICAL PCB, WITH SHORT TRACES, THIS COMPONENTS ARE NOT NEEDED. U1 LTC3631EDD E1 2 VIN 4.5V - 45V CIN 4.7uF 50V 1210 R4 4.7 Ohm * 5 7 3 CIN1 0.22uF 100V * E2 4 GND VIN RUN VFB HYST ISET SS CSS 0.047uF R1 2M SW GND GND 1 6 L1 100uH E3 SLF6028T-101MR42-PF TDK COUT 47uF 6.3V 1206 3 VOUT 100mA(max) COUT2 COUT1 47uF 0.1uF 6.3V 16V 1206 E4 GND 3 8 CFFW RSET (Opt) E5 9 (Opt) SGND RFB1 1.47M 1% RUN 1 ON R2 2 2 (Opt) 3 OFF RFB2 1.18M 1% JP4 5V JP3 3.3V JP2 1.8V 2 APPROVALS 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. A RFB3 475K 1% R3 0 Ohm JP1 1 RFB4 280K 1% B DRAWN: Rudy Bautista ENGINEER: Chuen Ming Tan APPROVED: CHECKED: Date: C Thursday, February 26, 2009 LINEAR TECHNOLOGY CORPORATION 1630 McCARTHY BLVD MILPITAS, CA. 95035 (408)432-1900 (408)434-0507 (FAX) Title: LTC3631EDD www.linear.com LTC Confidential 1 For Customer Use Only High Efficiency 100mA Monolithic Synchronous Buck Regulator SD Document Number C:\ORCADWIN\CAPTURE\1499A\1499A_REV0.DSN D Rev Demo Circuit 1499A Sheet E 1 0 of 1