1 2 3 SHDN PG LT3500EDD 2 SHDN SW 12 FB 8 3 SS TP3 C3 0.47uF 16V D3 BAT54XV2T1 2 2 D2 OPT A L1 IHLP-2525CZ-ER-6R8 VOUT1 6.8uH 1 RUN 4 PG JP1 U1 D1 B240A COUT1 47uF 10V C1 0.22uF LDRV 10 5 VC R4 40.2K (800kHz) TP5 R14 0 R15 1K R16 TP9 COUT2 22uF 10V R7 24.9K 1% OPT VIN GND TP6 C7 OPT TP7 VOUT2 [email protected] GND R8 8.06K 1% R11 100K PG [email protected] Q1 ZXTCM322 VOUT2 SYNC VOUT1 C4 OPT R10 8.06K 1% R13 OPT LFB 9 13 GND R5 53.6K 1% PG C2 330pF 6 RT/SYNC 7 C6 OPT TP4 R9 42.2K 1% C5 OPT 2 TP2 R2 100K 1 GND CIN2 1uF 1 1 OPT CIN1 22uF 50V A R12 BST 11 TP1 D4 OPT 2 1 VIN VIN 1 VIN 6V-36V 2 TP8 B B 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 TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 1 CONTRACT NO. APPROVALS DRAWN DATE HELEN 2/28/06 Tiger Zhou 2/28/06 CHECKED APPROVED ENGINEER DESIGNER Thursday, October 04, 2007 TECHNOLOGY 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 TITLE LT3500EDD Monolithic Step-Down Switching Regulator with LDO SIZE CAGE CODE SCALE: FILENAME: 2 DWG NO REV A DC1069A SHEET 1 OF 1