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需要使用DC-DC，建议vsw引脚外接品质好一些的绕线电感。

建议电感参数：

额定电流>100mA

自谐振频率>11Mhz

等效电阻<1Ω

Hello. Can you tell us more about using DC-DC? If you don’t use it, where and how should you connect this pin?

@Jeneks

Or you can keep the L1 pads, and weld 0Ω resistance instead of inductance.

There is no impact remaining L1 on PCB when DC-DC is shut.

Please tell me how DC-DC is turned on/off? And in general, what is it for? Are there any documents with a more detailed technical description of the CH9141 chip?

Forget it. DC-DC is not suppoted by any version of CH9141 now.?

There is a inductance L2 on CH9141_B-PCB, but just works with previous CH9141-firmware.

So just ↓.

CH58x/CH59x series MCUs suppot DC-DC. It can reduce about 50% of average current.

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