5 4 3 2 1 REVISION HISTORY ECO REV __ 2 DESCRIPTION APPROVED PRODUCTION Goran P. DATE 7-31-13 RF 1.0 D EXTVCC JP1 VIN D CF 0.1uF 16 VIN 50V Q3 FCX619 SW E5 15 14 C2 0.47uF 16V E CE 0.1uF PBSS4140DPN 1 225KHz 2 150KHz C3 0.1uF 16V E6 6 ITH SGND BG 9 10 2 R1 10 VOUT R4 7 VOSENSE VPROG 21k 1% 8 R3 E7 -VIN E8 L1 3.5uH Q4 PBSS4140DPN 1 7443556350 SW 4 5 GND 1 2 3 INTVCC CVCC1 4.7uF 10V PGND CC2 1nF 11 4 2 SGND CC1 15nF 5 3 3 CCM RC1 15k INTVCC FCB 5 BURST 2 JP3 FSW RUN/SS J2 C D3 B340A 1 2 3 INTVCC JP2 MODE 1 1 4 6 3 E4 4 5 VIN 4.5V - 28V + CIN7 OPT 35V RJK0452DPB 4 3 RUN/SS SYNC 2 2 CMDSH-4E D2 6.8uF 50V 1812 +VIN 3 C J1 Q2 2 EXTVCC 1 1 12 Q1 6 2 BOOST CIN1 CIN2 CIN3 CIN4 CIN5 CIN6 1 1 TK 13 5 C B DZ PDZ6.8B TG U1 LTC1625IGN RZ 4.7k COUT2 + COUT3 COUT4 680uF 6.3V 7343 Q5 RJK0453DPB 0 COUT1 +VOUT J3 VOUT COUT5 + COUT6 100uF 10V VOUT 3.3V / 15A GND 1812 J4 R5 11.8k E9 -VOUT B B CUSTOMER NOTICE A 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 APP ENG. APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. HZ Goran P. TECHNOLOGY TITLE: SCHEMATIC LTC1625, SYNCHRONOUS STEP-DOWN REGULATOR SIZE N/A THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 4 3 SCALE = NONE 2 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only DATE: IC NO. REV. LTC1625IGN DEMO CIRCUIT 2008A Monday, January 06, 2014 2 SHEET 1 1 OF 1 A