5 4 3 2 1 REVISION HISTORY ECO REV DESCRIPTION 0 DATE APPROVED 1st PROTOTYPE D D VIN GND L1 4.7uH SD3814-4R7 ! " VIN E1 CIN 2.2uF 6.3V E2 E3 ENH S1 C R2 4.87k 1% R1 100k 1 20 19 ISETH 15 VC 0.1uF DISPLAY R4 R3 100k 10.2k 1% 2 ENL 3 ISETL 17 GND GND 9 11 16 250mA SW2 VOUT U1 LTC3452EUF ENH 13 C1 E4 ENL S2 14 COUT 4.7uF 6.3V LEDH AOT-2015 VIN PVIN SW1 FLASH # LEDH1 10 LEDH2 12 LEDL1 4 LEDL2 5 LEDL3 6 LEDL4 7 LEDL5 8 LEDL1 NSCW100 LEDL2 LEDL3 LEDL4 C LEDL5 NSCW100 PGND GND 18 21 B B ENL PWM DUTY CYCLE A LEDL1-LEDL5 CURRENT 94% 20mA 81% 10mA 69% 5mA 56% 2.5mA 44% 1.25mA 31% 0.625mA 19% 0.312mA 6% 0.156mA LEDH = 250mA CUSTOMER NOTICE LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A APPROVALS CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; DRAWN: Rudy B HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO CHECKED: TITLE: VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED APPROVED: CIRUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT ENGINEER: DAVID B. PERFORMANCE OR RELIABILITY. CONTACT LINEAR SIZE TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. DESIGNER: THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 CONTRACT NO. 4 3 TECHNOLOGY 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 LTC Confidential-For Customer Use Only SCHEMATIC DWG NO. A A DEMO CIRCUIT 928A Wednesday, March 08, 2006 DATE: 2 SHEET 1 1 REV 1 OF 1