1 REVISION HISTORY VIN 2.7V-20.0V E1 C1 2.2uF 25V 10% 0805 U1 * 6.3V 0402 C3 4.7uF 6.3V 0603 7 CAP VIN2 1 EN 2 JP3 11 JP4 3 1 1 ON D0 9 2 PRODUCTION FAB SW 5 VOUT 6 PGOOD D1 JP5 10 DATE 8-23-10 J.DREW VOUT ** 50mA E6 22uH IND-LPS5030 C4 100uF 6.3V 1206 20% 1 PULLUP GND E7 0 8 1 0 0 1Meg PGOOD E8 3 3 1 D1 R3 JP2 1 D0 - L1 VIN 1 JP1 APPROVED 3 OFF 3 STBY 3 EN DESCRIPTION 4 STBY GND REV 1 GND E2 C2 1uF ECO A EN E3 R1 ASSEMBLY TYPE * / OUTPUT VOLTAGE SETTINGS ** 100K STBY E4 GND E5 A GND E9 R2 100K 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. U1 * -A -B LTC3388-1 LTC3388-3 VOUT ** 1.2V 1.5V 1.8V 2.5V 2.8V 3.0V 3.3V 5.0V D1 D0 0 0 0 1 1 0 1 1 0 0 0 1 0 1 1 APPROVALS PCB DES. NC APP ENG. J.DREW TECHNOLOGY 1 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 20V HIGH EFFICIENCY NANOPOWER STEP-DOWN REGULATOR SIZE SCALE = NONE 1 IC NO. N/A LTC3388EMSE-1 / LTC3388EMSE-3 DEMO CIRCUIT 1658A-A/B DATE: 8-23-10 SHEET 1 REV. 2 OF 1