0 High Efficiency 5V converter using LM2671 IC

The circuit step down  DC (8V - 40V DC) to 5V DC. The circuit can deliver up to 500mA current. It can be used to power 5V rated devices and chargers specially those using USB port as power source.

5V converter schematic

Part List:
C1 - 47uF electrolytic capacitor rated 50V
C2 - 100nF Mylar or ceramic
C3 - 47uF electrolytic capacitor rated 16V
D1 - 3.3A, 50V Schottky Rectifier, IR 30WQ05F
IC - LM2671-5.0 IC
L1 - 68uH inductor (500mA minimum current)
Vin - 8V to 40V DC