5 4 3 2 1 REVISION HISTORY ECO REV DESCRIPTION APPROVED DATE 2 PRODUCTION FRAN H. 04-01-10 D D L1 10uH CDRH3D18NP-100N TANT (OPT.) VOUT 7 JP1 BOOST 9 C5 33pF MPPC JP2 MPPC DIODE GND E11 E12 R6 40.2K 1% C10 10nF 0603 R7 200K 1% R8 402K 1% 8 4 PGOOD E8 PGOOD SHDN FBLDO AUX 11 R10 100K R1 392K 1% R4 499K 1% LDO GND C Exposed Pad Solder Side 1 3 5 7 R5 0 FB 3 R9 549K 1% 10 C8 1uF 16V 0603 E7 LDO OUTPUT 1.5V / 2.2V / 3V @6mA GND R12 1.1M 1% OFF ON E10 NOTE: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTORS ARE IN 0402 ALL CAPACITORS ARE IN 0402 2. INSTALL SHUNTS AS SHOWN. 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. TECHNOLOGY JW FRAN H. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 4 3 A VERY LOW VIN STEP-UP CONVERTER WITH MAXIMUM POWER POINT CONTROL AND LDO IC NO. DATE: REV. LTC3105EDD 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 TITLE: SCHEMATIC SIZE 5 C7 4.7uF 16V 0805 B CUSTOMER NOTICE A C JP5 SHDN VLDO VPGOOD SHDN GND LDO JP3 LDO R11 274K 1% 1 2 3 1 2 3 JP4 PGOOD R3 845K 1% E6 C6 33pF E9 B R2 750K 1% 2 LDO VPGOOD E5 BOOST OUTPUT 1.8V / 3.3V / 5V 1 1.5V 2.2V 3V 5 SW C4 1uF 16V 0805 1 3 5 E4 VIN E3 C3 10uF 16V 0805 2 4 6 6 2 4 6 8 MPPC E2 DIODE 0.4V 2V 4V GND U1 LTC3105EDD 2 4 6 C1 10uF 6.3V 0805 +C2 1.8V 3.3V 5V E1 1 3 5 +VIN 0.2V - 5V 2 DEMO CIRCUIT 1587A Wednesday, December 22, 2010 2 SHEET 1 1 OF 1