1 2 3 4 5 6 7 8 L1 10uH U1 LT3980EMSE A C1 0.47uF VIN GND B + C2 10uF 100V C3 2.2uF 100V 1210 E2 1 2 3 4 SHDN EXTSS EXTSS BD RT 7 11 BOOST VC 6 12 SW NC 5 13 NC FB 4 14 VIN NC 3 15 DA PG 2 16 NC SYNC 1 exposed pad, solder side R6 100k 1% JP1 RUN 8 RUN/SS L2 TBD C C9 0.01uF 100V C10 2.2uF 100V 1210 C6 1500pF BURST MODE 3 B C5 0.1uF 1 2 3 E4 GND E5 PGOOD E7 SYNC C CONTRACT NO. APPROVALS DRAWN Kevin Lac DATE 8/2/09 CHECKED ENGINEER Kevin Huang 8/2/09 DESIGNER Thursday, August 06, 2009 4 TECHNOLOGY TITLE 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 LT3980EMSE D 2A, 58V STEP-DOWN SWITCHING REGULATOR WITH 75 A QUIESCENT CURRENT APPROVED THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 2 VOUT 5V / 2A C11 10uF 100V 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 TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. 1 C4 47uF 10V JP2 CUSTOMER NOTICE D R4 100k 1% C7 100pF SYNC VIN + R3 536k 1% E3 OPTIONAL CIRCUIT FB1 Bead R2 100k 1% R5 15k C8 0.1uF E6 VIN R1 56.2k 1% 17 VIN 6.8V - 58V TRANSIENT TO 80V E1 GND 10 GND 9 D1 B260A 2 1 A 5 SIZE CAGE CODE SCALE: DWG NO FILENAME: 6 REV A DEMO CIRCUIT 1476A SHEET 7 1 OF 8 1