5 4 * 3 2 D3 IS RECOMMENDED FOR VIN>4.5V. PLEASE REFER TO DATASHEET FOR DETAILS. SUMIDA CDRH4D28C/100 L1 10UH 1 2 2 2 * 1 VIN +C8 C1 10UF 6.3V 1206 47UF,10V TAJB R4 1M 3 7 SHDN 8 2 1 SW2 VIN SHDN/SS C6 0.047UF R1 340K 1% VOUT 6 FB 9 R3 MODE/SYNC VC 10 RT GND 5 SYNC E3 C7 1UF 6.3V 0603 R5 2.2K E5 GND C5 10PF R7 4.87M R6 60.4K 1% C2 22UF,6.3V 1210 C4 560PF 15K R8 6.19M E2 C R2 200K 1% SYNC VIN B BURST MODE 1 2 GND C3 180PF 4 11 C SW1 E4 VOUT 3.3V VOUT PHILIPS U1 LTC3440EDD D3 POWERMITE ON SEMI OPT D1 PMEG2010EA PHILIPS D D2 PMEG2010EA 2 1 GND 1 D VIN E1 2.5V-5.5V 1 FIXED FREQ. 3 SHDN 1 B JP1 2 JP2 RUN 3 VIN IOUT 2.5V 540mA 2.7V 600mA NOTES: UNLESS OTHERWISE SPECIFIED A 1. ALL RESISTORS ARE IN OHMS, 0402. ALL CAPS. ARE 0402. 2. INSTALL SHUNTS ON JP1 AND JP2 PIN 2 AND 3. CUSTOMER NOTICE CONTRACT NO. LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRUIT 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 3 APPROVALS TECHNOLOGY DRAWN: CHECKED: KIM T. APPROVED: 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 LTC Confidential-For Customer Use Only TITLE: A 1MHz SYNCHRONOUS BUCK-BOOST IN 3mm X 3mm DFN ENGINEER: DONGYAN Z. SIZE DESIGNER: A DWG NO. DC797A-1*LTC3440EDD DATE: Friday, August 20, 2004 2 SHEET 1 1 REV A OF 1