In brief: Based on review measurements: Price: MT3608 (0.6 $ vs. 4).
Model MC34063 2015 Read review → MT3608 2015 Read review → Voltage, V 12 28 Under load, V 11.44 3 Price, $ 4 0.6 Review conclusion Recommended With reservations
Only in one review: Current 2 A (MT3608); Test current 2 A (MT3608); Temperature rise 70 °C (MT3608).
MC34063: The author tested the MC34063 in a buck-boost converter and was pleased with the chips, especially for the price.
MT3608: The original board has poor layout and high ripple, but works better after modification.
Figures were taken from the review text and checked against the quoted passages. Measurement conditions differ between reviews, so read the reviews yourself before buying. Prices at the time of review.
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