5 4 3 2 1 REVISION HISTORY ECO REV DESCRIPTION D DATE PROTO 3 APPROVED 07/12/06 VIN D 3 FB1 VIN1 JP1 4.5V to 24V C3 2.2uF X7R 50V L1 4.7uH FP3-4R7 C12 0.47uF D3 CMDSH-3 D1 B360A C14 22pF U1 LT3501EFE 1 R14 IND1 C VOUT1 TP1 3.3V@ 3A, VIN1<16V 2.8A, VIN1>16V C24 10uF 6.3V C16 100uF 6.3V IND2 TP9 VOUT1 VOUT2 R7 100K R8 100K PG1 TP13 L2 3.3uH FP3-3R3 D2 B360A D4 CMDSH-3 D5 CMDSH-3 R9 BST1 20 SW1 SS1 19 3 IND1 VC1 18 4 VOUT1 FB1 17 5 PG1 FSET 16 6 PG2 SHDN 15 2 8.06K B SS1 C20 VIN1 7 VOUT2 FB2 14 8 IND2 VC2 13 9 SW2 SS2 12 10 VIN2 BST2 11 OPT GND C18 100pF PG2 TP4 C15 84.5K R15 10.0K TP14 FB2 SYNC TP5 C FOR 500kHz SHDN TP6 C17 22pF R13 31.6K PG2 R22 OPT 220pF R12 61.9K 21 R10 24.9K TP8 PG1 SS1 VIN2 0.1uF GND GND COMBINED 1 C1 33uF 35V + VOUT1 INDEPENDENT 2 VIN1 TP3 C19 330pF SS2 C13 0.47uF TP7 SS2 C21 B 0.1uF VOUT2 1.8V@ 3A, VIN2<16V 2.8A, VIN2>16V GND VIN2 C25 10uF 6.3V VOUT1 C23 100uF 6.3V R18 OPT R17 8.06K R19 OPT TP10 OPTIONAL ABSOLUTE TRACKING VIN2 TP11 4.5V to 24V + GND A C22 470pF VOUT2 TP2 C2 33uF 35V C4 2.2uF X7R 50V 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. TP12 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 4 3 CONTRACT NO. APPROVALS DRAWN A. Karpova DATE 08/10/06 CHECKED APPROVED ENGINEER Tiger Zhou 08/10/06 TECHNOLOGY 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 A TITLE LT3501EFE DUAL MONOLITHIC STEP-DOWN DC/DC CONVERTER DESIGNER SIZE Wednesday, September 13, 2006 SCALE: 2 CAGE CODE FILENAME: DWG NO REV DC964A SHEET 1 1 4 OF 1