A B C D E * VERSION TABLE VLDO ENABLE ASSEMBLY TYPE 1 ON 4 2 VOUT1 SELECT 3 OFF 1 3 4 R9 124K 1% R10 73.2K 1% DC970A-A LTC3541EDD DC970A-B LTC3541EDD-1 JP8 2 3 JP6 U1 VIN 3V-5.5V Vin E1 CIN 10uF 6.3V 1 CIN1 0.1uF 6.3V GND E2 * See table VIN SW 2 ENBUCK ENVLDO 9 3 BUCKFB MODE 8 4 LFB GND 7 5 LVOUT LVIN 6 BUCK ENABLE L1 1.5uH 10 C2 22pF 25V R8 1% Vout1 VOUT1 E5 C1 22uF 6.3V GND 1 LVIN_EXT 3 JP9 2 LVIN_EXT R5 576K 3 OFF VOUT1 2 1 ON 3 Io1max=500mA - Io2 E6 CLVIN 1uF 6.3V 11 (optional) LTC3541EDD PGND BURST 3 2 2.5V MODE PULSE SKIP 1 1.8V JP7 U1 E7 JP5 JP1 0.8V 2 JP2 1.2V JP3 1.5V JP4 1.8V Vout2 E3 C3 22pF R1 576K 1% R2 287K 1% R3 210K 1% R4 165K 1% CUSTOMER NOTICE A B COUT 2.2uF 6.3V Io2=300mA GND E4 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. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 1 COUT1 2.2uF 6.3V (Opt) 2 VOUT2 C CONTRACT NO. APPROVALS DRAWN A. Karpova DATE 10/28/05 CHECKED TECHNOLOGY TITLE LTC3541EDD/LTC3541EDD-1 1 High Efficiency, Low Noise, Step-Down DC/DC Regulator APPROVED ENGINEER 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 George Yu DESIGNER Friday, April 20, 2007 10/28/05 SIZE CAGE CODE FILENAME: SCALE: D DWG NO REV DC970A SHEET 1 E 3 OF 1