5 4 3 2 1 REVISION HISTORY ECO VIN VIN 2.7V - 12V GND E10 JP1 RUN SHDN 1 3 R1 100K C1 1uF 25V 0805 R2 OPT D 10 11 JP2 VIN 1 VIN E1 2MHz 16 3 12 VIN VIN R4 100K CTRL E3 1 E4 13 LOS VIN R7 1M C APPROVED PRODUCTION JESUS R. DATE 10-18-13 8 SW C5 0.22uF 100V 1206 6 VOUT D MONIN R12 634K EN/UVLO U1 LT3905EUD FSEL C6 OPT 15 FB R6 OPT 14 J1 0 9 GND LOS R16 5 APD ILIM APD Q1 ZXTN25100DFH LOS_MON 0 BNC 17 GND LOS_ADJ R21 OPT R15 LOS ADJ E6 R13 15.0K CTRL R5 100K ILIM E5 DESCRIPTION 2 1MHz R3 1M 7 VIN EN 3 10uH COPPER BUSSMANN SD3110-100-R 2 E2 REV __ L1 ILIM_MON 2 R17 MON 3 1K PWM E11 4 C8 OPT 100V 0805 GND LOS_MON E14 C3 OPT E8 C 50V / 2mA E13 R10 1M (12.5uA LOS) LOAD STEP CIRCUIT ILIM_MON E7 R9 OPT C2 OPT R8 12.4K (2mA Limit) MON MON B E9 C4 OPT B R11 4.99K (1mV/uA) VIN 0.5pF C9 R14 MON NOTE: UNLESS OTHERWISE SPECIFIED R18 OPT 4.99K R20 OPT 1. ALL RESISTORS ARE 0603. ALL CAPACITORS ARE 0603. V+ 4 + VIN R19 4.99K U3 GND NC GND NC CUSTOMER NOTICE C10 0.1uF 6 C12 1uF 1 5 OUT 2 3 Iset A C11 1uF TIA E12 U2 LT6210CS6 V- LT1790BIS6-2.048 FAST MONITOR RESPONSE CIRCUIT 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. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 4 APPROVALS 3 TECHNOLOGY JW JESUS R. TITLE: SCHEMATIC SIZE N/A SCALE = NONE DATE: 2 IC NO. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only BOOST DC/DC CONVERTER WITH APD CURRENT MONITOR LT3905EUD DEMO CIRCUIT 1956A Tuesday, October 22, 2013 SHEET 1 1 REV. 3 OF 1 A