5 4 3 2 1 REVISION HISTORY ECO REV DESCRIPTION 0 1 D DATE PROTO Change Voltage Rating "C1" 08/15/07 D VIN L2 15uH NR4012T150M Taiyo Yuden L1 10uH NR4018T100M Taiyo Yuden C1 4.7uF 25V VOUT2 C10 L3 15uH NR4012T150M Taiyo Yuden 1uF 25V D2 DFLS120-7 D3 (Opt) E3 VOUT1 12V / 300mA D1 VOUT1 C6 1uF 16V E4 GND VIN C3 10uF 16V 1206 OUTPUT 1 1 ON 2 JP1 SHDN/SS1 DFLS120-7 R1 54.9K 1% R2 3 OFF E5 RSS1 4.7K C7 100pF SW1 VIN 6 CSS1 0.33uF C4 10uF 16V R3 (Opt) C8 (Opt) C9 1uF E7 VOUT2 -12V / 200mA E8 GND C SW2 FB2N 5 U1 LT3471EDD 7 SHDN/SS2 GND FBIP VREF 11 2 3 R4 0 Ohm R5 FB2P 4 R6 15K 182K 1% C11 100pF 3 OFF JP2 SHDN/SS2 8 9 SHDN/SS1 OUTPUT 2 1 ON 2 E9 10 1 FBIN 4.99K 1% VIN B J. Rosales VIN E1 VIN 4.5V - 10V E2 GND C APPROVED 0x/xx/07 RSS2 4.7K B C2 0.1uF NOTES: To convert VOUT2 to Positive Output CSS2 0.33uF 1. Remove R5, C11, L3, C10 and D2. 2. Short out R6. 3. Install D3. 4. Calculate values of R3, R4 and install. 5. Install C8 as needed. LINEAR TECHNOLOGY CORPORATION APPROVALS A 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. 5 4 3 1630 McCARTHY BLVD MILPITAS, CA. 95035 (408)432-1900 (408)434-0507 (FAX) DRAWN: ENGINEER: J. Rosales A LTC Confidential For Customer Use Only DUAL OUTPUT STEP-UP SUPPLIES APPROVED: SD CHECKED: Date: www.linear.com Document Number Sheet C:\ORCADWIN\CAPTURE\1280A\1280A_REV1.DSN Friday, August 17, 2007 2 Rev Demo Circuit 1280A 1 1 1 of 1