Small size, high current and low IQ for infotainment


Think of the typical automotive infotainment system: a lot of functionality and various subsystems crammed into a tiny dashboard. Accommodating a small size is a key design challenge.

Many subsystems such as the processor need a lot of power. With so many subsystems, many share common voltages such as 3.3V and 1.8V. The required current on these rails adds up fast; sometimes up to amps of current for everything. But a small area needs higher currents.

Drivers can turn off a dashboard display. But they will want it to turn it on quickly, especially if the vehicle has a backup camera. In these cases, the infotainment system idles instead of going fully off. The processor goes into standby mode but all voltage rails are kept up and alive. Thus, a low quiescent current (IQ) is highly desirable to minimize power consumption in this idling state.

The new TPS62067-Q1 automotive step-down converter delivers small size, higher current and low IQ design requirements. Packaged in a 2- x 2-mm small-outline no-leads (SON) package and requiring just six small passive components, this buck will fit into any infotainment system you’re designing. Switching at 3MHz keeps those passives tiny, while staying well above the AM radio band. The 2A it delivers should be plenty for most of your rails. And its 18µA of IQ means that when you turn its loads off, it won’t draw significant power. It’s almost as if you turned the entire device off, even though it is actually still on and regulating the output voltage. Your infotainment system is still up and running; it’s just waiting for the driver to activate it.

What rails in your infotainment systems need small size, high current and low IQ?