A B C C4 0.1uF U1 6 REV - 3 7 C2 47uF 16V 1210 + C3 1uF 0603 5 3 VCC 12 PWM/SYNC 3 C12 1uF 0603 E3 4 SW2 BST1 BST2 VIN VOUT SNSGND COMP VCC FB PWM/SYNC RUN GND RUN 13 SW1 LTC3111EDE NC SGND DESCRIPTION APPROVED DATE JB 2 - 6 - 14 PRODUCTION FAB C5 0.1uF 9 E2 VOUT 10 1 C6 22pF C7 R4 2 41.2K 1500pF 11 C8 47pF R3 11.5K 14 TIE R2 TO PIN 14 THEN TIE PIN 14 TO GND PLANE UNDER IC 4 VOUT 5.0V / 1.5A R7 49.9 1% 8 15 4 C1 OPT TANT ECO 10uH VIN 2.5V - 15.0V E REVISION HISTORY L1 VIN E1 D R1 845k 1% Vin > 5.0 V C9 100uF 1210 16V C10 1uF 0603 R2 158K 1% 3 E4 GND GND VIN ON RUN OFF 2 1 2 3 JP1 R5 1M 1% GND RUN C11 100pF R6 DNP CUSTOMER NOTICE NOTE: UNLESS OTHERWISE SPECIFIED 1 RUN E5 1. ALL RESISTORS ARE IN OHMS, 0402. 2. INSTALL SHUNTS AS SHOWN. B 1 2 3 BURST PWM/SYNC 2 JP2 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. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. A 800kHz OSC SYNC VCC PWM TECHNOLOGY NC JB 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 15V, 1.5A SYNCHRONOUS BUCK-BOOST DC / DC CONVERTER SIZE IC NO. N/A SCALE = NONE C DATE: REV. LTC3111EDE DEMO CIRCUIT 1999A 2 - 6 - 14 3 SHEET D 1 E 1 OF 1