An illustration is a powerful tool to deliver a concept. Linear Technology’s parts are in many of the world’s leading products. It isn’t always possible or relevant to show specific brands in application. Borrowed equity isn’t necessary. The focus is on the LTC4155 and how it seamlessly manages power distribution from two 5V sources, such as a USB port and a wall adapter, to a single-cell rechargeable Lithium-Ion/Polymer battery and a system load.