Using MT3608 chip, one SEPIC boost and buck output and two LDO outputs.
The input voltage is 2.8~24V, the SEPIC output voltage is 7.2V, the LDO output voltage is 5V, the total output current is 1A, and the main chip switching frequency is 1.2MHz.
The power input part has a PMOS anti-reverse connection circuit, the SEPIC output part adds a first-level LC filter, and the LDO output part has two resistors connected in series to avoid self-excitation caused by too low ESR of the MLCC capacitor, which can be adjusted by the user.
The ripple is less than 30mV when the SEPIC outputs 300mA, and the ripple is less than 8mV when the LDO outputs 300mA.
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