5 4 3 2 1 D D 60V MAX TRANSIENT VOLTAGE 7.5V - 36V R1 1.0 5% GND C2 4.7uF 50V 1206 R2 10k JP1 E2 L1 7.8uH U1* LT3663EDCB-X.X RUN 1 VIN 2 RUN SW 8 BOOST 7 ISENSE 6 C3 0.1uF 16V SD6030-7R8-R D1 DFLS240 40V 2.0A 1 C1 4.7uF 50V 1206 2 E1 HVIN SHDN 1 1 R3 71.5k JP3 R4 147k C E3 VOUT 5 HVBUCK C4 47uF 1206 10V 20% 3 0 ILIM 9 JP2 0 4 GND CURRENT LIMIT SETTINGS VOUTS C R5 75k R6 20 5% TP1 VOUT * 1.2A GND TP2 CURRENT LIMIT SETTINGS TABLE B JP2 0.6A 0 JP3 0 VERSION TABLE 0.8A 1.0A 1.2A ASSY 0 1 1 0 1 1 -A U1* LT3663EDCB-3.3 VOUT * 3.3V -B LT3663EDCB-5.0 5.0V Unless noted: Resistors: Ohms 0402 1% 1/16W Capacitors: 0402 10% 25V A 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 CIRUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. B CONTRACT NO. APPROVALS DRAWN: 4 3 TECHNOLOGY J. Drew CHECKED: APPROVED: ENGINEER: J. Drew DESIGNER: TITLE: SCHEMATIC SIZE DWG NO. DATE: 2 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 LTC Confidential-For Customer Use Only LT3663EDCB - 3.3 / 5.0: 1.2A, 1MHz Step-Down Switching Regulator with Output Current Limit A THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 E4 REV DC1570A-A/B Thursday, September 03, 2009 SHEET 1 A 1 OF 1 A