The BD10KA5W is a low-saturation regulator with an output voltage precision of ±1% between 1V and 4V. It also has built-in overcurrent protection that prevents the destruction of the IC, due to output short circuits and a thermal shutdown circuit. Features: Max Output Current : 500mA Output Voltage Precision : 1.0V ±1% Built-in Overcurrent Protection Circuit Built-in Thermal Shutdown Circuit Shutdown Switch Operating Temperature Range : -40C to +105C Why Power Needs to be Regulated: https://www.sparkfun.com/tutorials/103 Datasheet: http://dlnmh9ip6v2uc.cloudfront.net/datasheets/Components/General%20IC/bdxxka5-e.pdf