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TPS61220: How to prevent reverse currrent when EN is set to LOW

Part Number: TPS61220

The settings for TPS61220 are as follows.

Vin 2.8~5.0V

Vout 6V

Iout 50mA

Cout:12uF

Loadtype:LED

Vsys is connected to the USB host, lithium-ion battery, and charger, and after setting EN to LOW, I think it is necessary to prevent reverse current of Vin from Vout.

In that case, please tell me whether I should install the diode on the Vout side or on the Vin side (before Cin).

↑Vout Side