A 100K 4 5 6 7 8 FC SYNC 2 6.3V C7 22uF 6.3V C14 (OPT) VIN TP1 C10 10uF 6.3V VIN 2.75V - 4.5V 7 8 22uF 6 RUN R4 10K 1 PLLLPF BOOST 10 BG 8 3 TRACK/SS VFB VFB 4 ITH 5 13 R5 (opt) R9 1.18K 1% 590 1% 1 R8 R10 0 0.47uH IHLP-2525CZ-01 + C13 (OPT) C1 47uF 6.3V C2 47uF 6.3V C11 10uF 6.3V A VOUT 1.8V@8A TP6 R1 C4 680pF C6 R2 5.1K C5 33pF GND TP7 118K 1% 47pF R3 59K 1% TRACK/SOFT START 2 JP2 3 VIN TRACK SOFT START GND TP2 4 C12 0.22uF 7 IPRG TP5 L1 1 TG 9 SW 12 5 6 2 SYNC/MODE C9 10nF 2 LTC3822EDD-1 3 U1 TP4 TP8 Q1 FDS6898A 1 TP3 VIN TRACK + C8 D1 CMDSH-3 TP10 R7 10K IPRG BURST PS (Pulse Skipping) VIN 11 PLLLPF 2 3 GND RUN MODE JP1 SYNC A 1 R6 VFB B B B C3 (OPT) CUSTOMER NOTICE 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 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 CONTRACT NO. APPROVALS DRAWN HELEN DATE 9/08/06 CHECKED TECHNOLOGY TITLE APPROVED ENGINEER Charlie Zhao 9/08/06 DESIGNER Monday, September 18, 2006 LTC3822EDD-1, Low Vin Synchronous Step-Down Converter with Tracking and PLL SIZE CAGE CODE SCALE: 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 FILENAME: B DWG NO REV A DC1105A SHEET 1 OF 1