5 4 3 2 1 D D R13 VIN1 R12 OPT EN1 E15 C2 L1 0.1uF 10V 0402 9 10 C C17 1uF GND C28 1uF E5 SW2 SW2 SW2 FB1 FB1 FB2 FB2 4.7pF R2 187k 12 E9 28 TR/SS1 SYNC/MODE 4 INTVCC PG1 GND EN2 R7 22 6 C3 10V 3 4 5 E13 0 0.1uF L2 2.2uH 0402 C XFL4020-222ME 4.7pF C9 26 27 VOUT2 R3 C5 47uF 10V 1210 1M C27 1uF C19 1uF E4 PG2 E12 11 VOUT2 3.3V / 2.5A GND E6 2 PG1 E14 R6 1M 21 3 15 2 BURST MODE B R5 14.7k 2MHz NC SYNC/MODE 1 PULSE SKIPPING 1 TR/SS2 PG2 17 SYNC E7 C18 22uF 63V 63CE22BS E11 R4 316K C6 0.01uF E8 + R9 OPT 25 BOOST2 SW1 SW1 E10 R8 1M C11 2.2uF 50V 1206 NC 24 BOOST1 RT SYNC/MODE 13 14 C8 C7 0.01uF SS1/TR1 SS2/TR2 C4 22uF 10V 1210 3.3uH XAL4030-332ME BIAS 7 E3 1M ENUV2 GND 5V / 1.5A R1 VOUT1 EN/UV1 29 VOUT1 8 VIN2 U1 LT8616EFE 16 23 E2 NC 20 GND C16 0.1uF 50V 0402 C14 0.1uF 50V 0402 NC R11 1M C13 0.1uF 50V 0402 18 C1 22uF 63V 63CE22BS C15 0.1uF 50V 0402 NC + C10 2.2uF 50V 1206 19 PAD150-094 VIN2 4.1V - 42V VIN2 E1 VIN1 5.8V - 42V 0 VIN1 R10 1M VOUT2 B VOUT1 C12 1uF JP1 4 Pins 2mm Ctrs. L4 0.22uH IHLP1212ABERR22M11 L3 30 ohm MPZ2012S300AT VIN2 VEMI E16 C25 0.1uF 50V 0402 C26 0.1uF 50V 0402 C23 4.7uF 50V 1206 C24 10uF 50V 1210 LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; TECHNOLOGY HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED TITLE: SCHEMATIC CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT DUAL 42V SYNCHRONOUS PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. A MONOLITHIC STEP-DOWN REGULATOR WITH 6.5µA QUIESCENT CURRENT NOTE: UNLESS OTHERWISE SPECIFIED SIZE 1. ALL RESISTORS ARE IN 0603 ALL CAPACITORS ARE IN 0603 5 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only CUSTOMER NOTICE N/A THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 4 3 DATE: 2 IC NO. LT8616EFE DEMO CIRCUIT 2169A REV. 4 SHEET Monday, January 19, 2015 1 1 OF 1 A