5 4 3 2 L1 XAL4030-332ME ECO REV E2 GND C1 22uF 25V 1812 C3 OPT 7343 C2 1uF 25V C19 DNP C14 47nF 25V C15 10nF 25V 24 23 RUN1 RUN2 E6 C6 OPT 7343 + C4 22uF 25V 1812 E7 GND R6 1M C5 1uF 25V R7 374k PGD VIN2 CN2 19 SEL CP2 4 MODE RUN2 21 C17 47nF 25V ITH CN1 VIN2 VIN2 5V - 18V FB CM2 V1GD 5 RUN1 C16 10nF 25V A MODE 1 FIXED FREQ 2 3 AUTOBURST MODE V2GD R1 402K 13 9 R12 DNP C7 47uF 10V 1812 C21 DNP C9 1uF 25V C8 47uF 10V 1812 D FOR VIN > 5 V E4 GND E5 GND 12 PGD VCC C10 1.8nF 1 SELECT 6 MODE R3 40.2K C11 22pF R8 1M R2 100k C E9 PGD PGD 10 V1GD VCC 11 V2GD R9 1M U1 V1GD LTC3118EUFD C18 4.7uF 0805 R10 1M D1 NOTE: UNLESS OTHERWISE SPECIFIED 2 E10 V1GD VOUT B E11 V2GD V2GD BAT54XV2 REMOVE D1 IF VOUT > 5.5 VOLTS E12 RUN2 1. ALL RESISTORS ARE IN OHMS, 0402 ALL CAPACITORS ARE IN MICROFARADS, 0603. 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 APPLICATION. COMPONENT SUBSTITUTION AND PRINTED APP ENG. CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. TECHNOLOGY NC JB THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 3 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only A 18V, 2A Buck-Boost DC/DC Converter with Low-Loss Dual Input PowerPath IC NO. DATE: REV. LTC3118EUFD DEMO CIRCUIT 2045A N/A SCALE = NONE RUN2 TITLE: SCHEMATIC SIZE 4 E3 8 JP2 5 10 - 3 - 14 VCC CUSTOMER NOTICE VCC JB VOUT 5.0V / 2A R11 49.9 1 JP1 DATE VCC C20 DNP B VCC SELECT 1 IDEAL DIODE 2 SELECT 3 PRIORITY APPROVED PRODUCTION FAB 14 CP1 20 E8 VOUT CM1 18 C SW2 RUN1 22 R5 715k 15 C13 0.1uF VIN1 3 RUN1 R4 1M BST2 GND + 2 2 DESCRIPTION VOUT 7 2.5V - 18V BST1 PGND E1 16 25 VIN1 VIN1 VCC C12 0.1uF SW1 17 - D 1 REVISION HISTORY 10 - 3 - 14 2 2 SHEET 1 1 OF 1