1 2 3 4 5 6 7 8 D2 3 A 5.5V - 25V Input Range A MMBD914LT1 E1 D3 L1 6.8uH DO3316P-682 C4 E5 VIN 1 VIN 1 1 3 .33uF 16V optional 6 + C3 10uF 50V MARCON VOUT U1 LT1374CR D1 C5 100uF 10V AVX 3 + + R2 5.36K 1% C7 optional 4 S/D 3 MBRD835L VOUT 3.3V/4A or 5V/4A Output 3.3V / 5V LINK B VC SD SW FB 7 R3 4.99K 1% 1 2 1 BOOST S/D VIN GND 1 B 5 C6 0.47uF 25V + J1 4 E2 R4 2.74K 1% 1 E3 1 GND R1 optional C1 1500pF 50V E4 1 C2 optional GND C C NOTES : unless otherwise specified 1. all resistors values in ohms , 1/8w , 5% 2. all components 1.8mm high LINEAR TECHNOLOGY COPORATION 1630 McCARTHY BLVD. MILPITAS, CA 95035 (408) 432-1900 (408) 434 - 0507 FAX D D Title 4.5A, 500kHz Step-Down Switching Regulator 1 2 3 4 5 Size A Document Number Date: 12-09-97 Rev DC187A 6 LT1374CR Sheet 7 1 of 1 8