ETA2858 step-down power module

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The physical diagram and output voltage results are in the attachment.

The power chip uses ETA2858 designed by Yutai, and the package specification is EFN3X3-12. For detailed information, please view the chip manual in the attachment.

The model of the field effect transistor used is SED3080M, the type is N-channel, and the packaging specification is DFN3X3.

It is recommended that capacitors C1 and C2 be made of X7R material, with a voltage resistance of 50V and a package specification of 1206

Capacitors C3, C4, and C7 are made of X7R material, with a voltage resistance of 50V, and packaging specifications of 0603

Capacitors C5 and C6 are recommended to be made of X5R or above material, with a voltage resistance of 10V and a packaging specification of 0805

The resistor package specifications are all 0603, accuracy +1%, 1/10W

The inductance value of the inductor can be selected between 2.2uH-4.7uH, and the package specification is 1040

The diode model is 1N5819 and the package is SOD-323

All the above components are made of SMD components

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