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 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 DATE PROTO 2 APPROVED 05/14/08 D D TP2 VIN_BUCK VIN BUCK C1 2.2uF X7R 50V R1 OPT [1] TP1 R2 OPT [1] VIN_BOOST 4 23 SW1 1 24 19 1 C5 22uF 6.3V 2 C11 1uF DFLS140 R5 32.4K 1% TP10 GND 3 21 FB3 20 VC2 18 RT R8 22.1K 1% R10 C7 1nF 15 GND 1 10.2K C13 1% Q1 FMMT618 TP7 2 NP_DRIVE 25 GND 100K GND R12 R9 100K FB2 SYNC GND 14 16 3 SHDN3 SW2 3 C 3.3V@1A R6 10.2K 1% 6 JP2 SHDN2 13 5 3.3V 1 OFF 2 ON R7 100K 12 SS2 3 SHDN1 17 12V 1 JP1 11 SS1 R4 10K 1% FB1 8 VIN_BUCK C4 10uF 16V 10 9 GND 1uF 2 C12 TP11 TP6 CDRH6D28NP-100 100nF D3 R3 143K 1% VC1 TP5 L2 10uH C3 BOOST DFLS120 12V@275mA CMDSH-3 BIAS 2 IN3 D2 1 C 22 D1 U1 LT3570EUF 1 10uH CDRH6D28NP-100 IN2 GND L1 2 C2 4.7uF 16V TP3 7 3.3V - 10V IN1 VIN BOOST R16 0 2 TP4 GND IN2 4V - 36V 2.5V@100mA C6 C15 2.2uF 1uF TP9 GND OPT 2.5V 1 OFF 2 ON B JP3 3 C8 C9 R11 100K C14 C10 1nF 100nF R13 44.2K 1% R14 22K B 100nF OPT TP8 ON OFF R15 22K SYNC UNLESS OTHERWISE SPECIFIED DIMENSIONS ARE IN INCHES TOLERANCE ON ANGLE - - 2 PLACES - - - 3 PLACES - - INTERPRET DIM AND TOL PER ASME Y14.5M -1994 A THIRD ANGLE PROJECTION CONTRACT NO. APPROVALS DRAWN MEI DATE 05/10/06 CHECKED TECHNOLOGY TITLE APPROVED 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 A SCH, LT3570EUF, DC/DC BOOST, BUCK AND LDO CONVERTER ENGINEER DESIGNER NOTES: UNLESS OTHERWISE SPECIFIED, [1] DO NOT STUFF. DO NOT SCALE DRAWING 5 SIZE CAGE CODE Custom 4 3 Thursday, June 19, 2008 SCALE: NONE 2 DWG NO REV 2 DC1106A FILENAME: 1106A-2.DSN SHEET 1 1 OF 1