Portable Devices

Battery Power Path Prioritizes System Load Before Charging

Plugging a battery-powered device into an adapter does not always mean that adapter current flows straight into the battery first. Many portable designs use a power-path circuit that manages external input, the system load, and the battery as related but distinct power flows. This arrangement lets the device operate while the battery charges. More importantly, it gives the active system priority when the adapter cannot supply both the requested system power and the full programmed charge current.