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Power

Buck-boost

Handles input both above and below the output. Used in battery-powered devices.

How it looks

Drawing: this is not on CORE3588, so it is drawn
Vbattery drains over timebattery 4.2 V3.0 Voutput 3.3 Vbattery above 3.3 V: step downbelow: step up
A battery starts above the output voltage and ends below it; a buck-boost holds the output steady through both. Not on CORE3588, which runs from USB.

How it works

A BATTERY DRAININGVbattery drains over timebattery 4.2 V3.0 Voutput 3.3 Vbattery above 3.3 V: works as a buckbelow 3.3 V: works as a boost

Where it fits

Common in battery products, often inside a PMIC next to a BMS.

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