5 4 3 D1 (opt.) PEMG2010EA 2 1 L1 3.3uH 2 (opt.) 1nF(opt.) Vin 2.7V-5.5V Vin 9 E1 + C2 47uF 10V GND E4 Iout 2.5V 1.1A 2.7V 1.2A CIN 10uF 6.3V 1 SW1 SW2 CSS 0.01uF 1 DISABLE 2 ENABLE 3 RLIM 10 CLIM 1nF 2 1 FB VC 11 15K RT BURST SGND C5 0.1uF opt. A R4 221K 5 E3 GND 470pF C R3 200K C4 0.1uF Average Input Current Limit 3 JP3 MODE 1 2 FIXED FREQ. 3 BURST MODE B AUTO ON Vin R7 opt. 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. APPROVALS DRAWN 4 June Wu DATE 5/4/04 CHECKED ENGINEER DongYan Zhou 5/4/04 DESIGNER Monday, November 08, 2004 3 TECHNOLOGY 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 TITLE LTC3442EDE, High Efficiency Synchronous Buck-Boost Converter APPROVED THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 C3 1uF 1M(opt.) 2 opt. COUT 47uF 6.3V JP2 2 Q1 2N7002 opt. 1 CFF 220pF CP PGND 3 E2 RFF 2.2K Vout [email protected] C6 opt. 7 4 R5 3 R6 RZ RLIM Optional Current Foldback Vout Vout 8 12 B RLIM D U1 LTC3442EDE VOUT SHDN/SS RT 43.2K RUN 6 R2 340K RLIM 143K JP1 Vout SHDN PEMG2010EA 4 VIN 1 D2 (opt.) 1 RSS 1MEG C Vin(min) 2 C1 R1 D 2 A with Automatic Burst Mode SIZE CAGE CODE SCALE: FILENAME: 2 DWG NO REV A DC799A SHEET 1 1 OF 1