5 4 3 2 1 U1 LTC3624HMSE (1MHz) E1 D VIN 2.7V - 17V 3 + CIN [1] 47uF 20V C2 22uF 25V 1206 R7 0 RUN E2 C3 22uF 25V 1206 4 VIN SW VIN SW L1 3.3uH 2 E7 5 2 Coilcraft XAL4030-332ME RSET 619k 1% RUN 3 OFF R8 OPT JP1 FB C7 OPT FCM / SYNC [2] 3 MODE/SYNC R10 OPT 4 PS [2] JP2 2A E9 R2 309k 1% R3 196k 1% R4 137k 1% R5 84.5K 1% R6 OPT JP7 5.0V JP8 USER SELECT E10 GND JP3 1.2V 6 JP4 1.8V JP5 2.5V JP6 3.3V C 10 GND 2 PGOOD GND 1 D NC 7 12 BM [2] CFF 15pF C6 OPT 1210 VOUT INTVCC 11 C C8 2.2uF 10V 0603 R9 OPT MODE C5 OPT 1206 VOUT ADJ GND R1 619k 1% 9 INTVCC C4 47uF 6.3V 1206 8 RUN INTVCC R12 0 1 ON GND E3 E8 1 E4 SYNC INTVCC E5 GND R11 1Meg E6 B PGOOD B NOTES: [1] CIN IS AN OPTIONAL CAPACITOR. IT IS INSERTED ON THE DC2359A TO DAMPEN THE (POSSIBLE) RINGING VOLTAGE DUE TO THE LONG INPUT LEADS. ON A NORMAL, TYPICAL PCB, WITH SHORT TRACES, THE CAPACITOR IS NOT NEEDED. [2] FOR FCM OPERATION, STUFF R9 AND R10 WITH 1MEG OHM RESISTOR. CUSTOMER NOTICE APPROVALS LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED APP ENG. CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. A TECHNOLOGY `\ Z_ TITLE: SCHEMATIC 5 4 3 IC NO. N/A SCALE = NONE A MONOLITHIC SYNCHRONOUS BUCK REGULATOR WITH ULTRA-LOW QUIESCENT CURRENT SIZE THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only LTC3624HMSE DEMO CIRCUIT 2359A DATE: Wednesday, August 12, 2015 2 SHEET 1 1 REV. 1 OF 1