A B C D E REVISION # IS AN OPTIONAL CAPACITOR. IT IS INSERTED *CIN1 ON THE DC1460A TO DAMPEN THE (POSSIBLE) REVISION HISTORY SD PC AD FD RINGING VOLTAGE DUE TO THE LONG INPUT LEADS. ON A NORMAL, TYPICAL PCB, WITH SHORT TRACES, THE CAPACITOR IS NOT NEEDED. DESCRIPTION DATE APPROVED ChuenmingT 0 0 0 0 2 2 1 2 L1 from "LPS3010" to "LPS3008" series. 4/9/09 3 2 1 2 L1 from "LPS3008" to "LPS3010" series. 6/26/09 ChuenmingT 1st Release 4 4 E7 U1 LTC3620EDC LOBATB E1 8 VIN 2.8V - 5.5V + E2 PVIN LOBATB CIN 1uF 6.3V CIN1 10uF 16V * SW R2 715K 1% 4 SW 1 GND 7 RUN NC 5 L1 E3 VOUT 22uH COUT LPS3010-223ML 1uF 6.3V COUT1 0.1uF 3 RUN FMIN/MODE 1 ON SGND 2 2 3 OFF GND FB 3 6 22pF PGND RFB1 1.37M 1% 9 RFB4 1.65M 1% RFB3 1.37M 1% FMIN / MODE CGND RFB2 681K 1% JP5 E6 E5 R1 1M JP1 2 E4 CFFW 3 VOUT 15mA(max) 1 2 FREE RUN 3 4 EXTERNAL CLOCK 5 6 50kHz (MIN.) JP4 1.1V JP2 1.8V JP3 1.2V 2 R3 1M LINEAR TECHNOLOGY CORPORATION 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. 1 A B DRAWN: Rudy Bautista ENGINEER: Tom Gross/Chuen MT 1630 McCARTHY BLVD MILPITAS, CA. 95035 (408)432-1900 (408)434-0507 (FAX) Title: Date: C Tuesday, August 04, 2009 LTC Confidential For Customer Use Only LTC3620EDC High Efficiency Monolithic Buck Regulator APPROVED: CHECKED: www.linear.com SD Document Number C:\ORCADWIN\CAPTURE\1357A\1460A_REV3.DSN D Rev Demo Circuit 1460A Sheet E 3 1 of 1 1