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 5 1 TP5 JP2 150uF C13 35V VIN TP4 J2 C10 C16 10uF 10uF 25V Q1 PH8230E 25V 4 TP2 R20 12K 6.3V C17 100uF 6.3V C18 100uF B320A 6.3V 100K [1] U1 LT3740EDHC Q2 PH3830L 4 R28 0 1 SN- VC 16 2 PGND FB 15 3 BGATE XREF 14 4 BGDP SHDN 13 5 SN+ PGOOD 12 RANGE 11 VIN 10 SWB 9 3 2 1 GND GND TP3 C25 [1] J4 R1 D2 0.007 D3 [1] MMSZ5230BS VIN BIAS 6 SW 7 TGATE 8 BIAS GND 6.3V C19 100uF 2 J3 C24 10uF D1 VIN R29 R26 0 R27 0 5 1.8V@10A VOUT L1 0.9uH VOUT VOLTAGE_SS OFF C15 1nF 2200pF C14 100pF ON 2 1 + C1 J1 3 R14 0 1 VOUT INTERNAL R33 3 2 1 GND 22pF REFERENCE REFERENCE 2 1 GND 10 JP1 100K 3V-15V VIN+ R19 R18 100K EXTERNAL R22 0 15K JP3 VOUT C20 1uF 3 Q3 2N7002TA [1] ON 2 R25 100K CURRENT_SS OFF TP6 PGOOD VIN L2 R2 [1] 22uH R4 [1] 17 [1] 2 R30 1 TP1 5 VIN+ R13 0 [1] 80.6K1% C12 3 VIN C11 OPT 1% EXTERNAL 3 100.0K R15 0 APPROVED 05/24/06 VIN R17 R16 DATE PROD VIN R31 0 [1] R32 0 C21 C23 0.01uF VIN C22 1uF 16V 1uF 25V CONTRACT NO. APPROVALS DRAWN MEI NOTE: UNLESS OTHERWISE SPECIFIED, [1] OPTIONAL. DATE 07/19/05 CHECKED TITLE SCH, LT3740EDHC, HIGH EFFICIENCY STEP-DOWN CONVERTER APPROVED ENGINEER TECHNOLOGY 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 D. Ng DESIGNER SIZE CAGE CODE DWG NO REV 5 DC947A Wednesday, September 20, 2006 SCALE: NONE FILENAME: 947A-5.DSN SHEET 1 OF 1