1 2 * FOR DEMO BOARD USE ONLY R2 200K ON 2 3 1000K VOUT2 COUT1 (OPT) L2 1.5uH COUT2 4.7uF 6.3V COUT3 2200uF 6.3V 10 Vfb2 E9 3 VOUT2 SW1 5 C1 (OPT) R5 COUT7 1000K 1% (OPT) COUT4 2200uF 6.3V 7 SW2 R7 215K 1% DYNAMIC LOAD CIRCUIT Rlim E7 Q1 SUD50N03-10CP-E3 R10 10K 1 2 R11 51 R12 0.01 R13 (OPT) A 1000K RUN1 E4 PGOOD1 E6 L1 3.3uH E8 C2 10pF R6 1000K 1% Vfb1 1 COUT6 (OPT) COUT5 4.7uF 6.3V R8 221K 1% R9 110K 1% IOSTEP CLK E11 R4 PGOOD1 4 3 GND 8 PGOOD2 E5 ON Run1 2 11 GND VOUT2 3.4V / 2A Pulsed Load E3 R1 200K OFF 9 Run2 VOUT1 3.3V / 400mA E10 GND C3 2200pF J1 10mV / A 1 ** 2 3 4 5 RUN2 PGOOD2 JP1 RUN1 2 U1* * OFF R3 A JP2 RUN2 1 E2 3 CIN2 10uF 6.3V 1 GND CIN1* 68uF 6.3V Vin 6 VIN E1 4.5V - 5.5V Up to 500mA E12 GND ASSY U1 -A LTC3619EDD -B LTC3619BEDD 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 HELEN 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 DATE 7/13/09 CHECKED TECHNOLOGY LTC3619EDD / LTC3619BEDD SYNCHRONOUS BUCK DUAL REGULATOR WITH ADJUSTABLE INPUT CURRENT LIMIT FOR PULSED LOADS TITLE APPROVED ENGINEER Johan S. 7/13/09 DESIGNER SIZE CAGE CODE DWG NO REV 2 DC1489A - A / B Tuesday, September 08, 2009 SCALE: FILENAME: 2 SHEET 1 OF 1