5 4 3 2 1 REVISION HISTORY ECO VIN E1 VIN 2.5V - 15V C1 10uF 1210 D + C9 OPT 7343 U1 LTC3104EDE 2 1 6 R4 1M 10 9 VIN C6 1uF R10 1M JIM N. B ON OFF 1 2 3 8 5 VIN C7 12pF BST MODE SW RUNLDO FB RUN PGOOD VCC VINLDO NC GND VLDO FBLDO C3 22uF 10V 1206 R1 2M 1% R8 1M D C4 1uF 4 R2 2.21K 3 R3 1M 11 E6 7 PGOOD 14 C 13 VLDO 12 R5 2M 1% VIN R6 442K 1% R7 1M 1% C11 OPT 1206 VOUT 1 2 3 VIN VOUT JP4 E5 VLDO 1.8V / 10mA C5 4.7uF 6.3V ALL CIRCUIT GND CONNECTIONS SHOULD RETURN TO PIN 5 E4 GND B R9 OPT JP1 01-12-12 VOUT 3.3V / 300mA VIN RUN DATE E3 15 RUNLDO 1 ON 2 3 OFF JP2 PRODUCTION 15uH 0.1uF VIN C 2 APPROVED L1 C8 E2 MODE 1 BURST MODE 2 3 FIXED FREQ JP3 DESCRIPTION VOUT C2 1uF 25V GND GND REV __ C10 1nF OPT NOTE: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTORS ARE 0402 AND CAPACITORS ARE 0603. 2. INSTALL SHUNTS AS SHOWN. CUSTOMER NOTICE APPROVALS LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APP ENG. APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. A TECHNOLOGY LT JIM N. TITLE: SCHEMATIC 15V, 300mA, SYNCHRONOUS STEP-DOWN DC/DC CONVERTER WITH 2.8uA QUIESCENT CURRENT AND 10mA LDO SIZE THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 4 3 IC NO. DATE: REV. LTC3104EDE DEMO CIRCUIT 1754A N/A SCALE = NONE 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only Thursday, January 12, 2012 2 2 SHEET 1 1 OF 1 A