5 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 2 DATE PROTO APPROVED 02/05/08 D D DYNAMIC LOAD CIRCUIT 2 Q1 SUD50N03-10CP TP1 1 3 IOSTEP_CLK R1 10K J1 R2 1 R3 L1 2 3 4 5 0.01 1.5uH IOSTEP 10mV / A 51 C C E1 VIN 3V - 3.6V 10uF 6.3V 10uF 6.3V RUN 3 ON 2 OFF 1 E2 GND 3 PROG RLMT 44.2K B 1 1% CO1 + 2200uF 6.3V CO2 + 2200uF 6.3V CO3 + 2200uF 6.3V CO4 + OPT 6.3V VOUT 4.0V / 2A CO6 22mF OPT FB 2 PULSE LOAD E4 GND R5 CP OPT 432K 1% B CONTRACT NO. NOTES: UNLESS OTHERWISE SPECIFIED, [1] + 10uF 6.3V 1M 1% OPT JP1 CO5 R4 CFF 6 SHDN GND 68uF 6.3V CIN2 GND [1] CIN1 E3 VOUT 7 9 UP TO 500mA 4 VIN + C1 GND SW 8 LTC3125EDCB E5 CS 5 U1 FOR DEMO BOARD USE ONLY. APPROVALS DRAWN A MEI DATE 05/17/07 TECHNOLOGY 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 A TITLE SCH, LTC3125EDCB, STEP-UP DC/DC REGULATOR CHECKED APPROVED ENGINEER DESIGNER Monday, September 29, 2008 5 4 3 SIZE CAGE CODE DWG NO REV DC1267A FILENAME: SCALE: 2 1267A-2.DSN 2 1 SHEET 1 OF 1