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what is the maximum voltage for this part
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LaserTazerPhaser:
This is a great inexpensive boost chip https://datasheet.lcsc.com/szlcsc/1811201211_hengjiaxing-HX3608_C296278.pdf but im not sure if it will accept up to Vin max for VEn pin. It says the minimum is 3.6v for VEn but it doesn't say maximum for the pin. Typically for swhiching ICs its up to Vin max but Im not sure about this part.
amyk:
Given the sample application schematic I would certainly hope so.
LaserTazerPhaser:
It seems like the package is far too small for the power handling of this device or is it typical of this package?
spec:
--- Quote from: LaserTazerPhaser on January 16, 2019, 01:07:41 am ---This is a great inexpensive boost chip https://datasheet.lcsc.com/szlcsc/1811201211_hengjiaxing-HX3608_C296278.pdf but im not sure if it will accept up to Vin max for VEn pin. It says the minimum is 3.6v for VEn but it doesn't say maximum for the pin. Typically for swhiching ICs its up to Vin max but Im not sure about this part.
--- End quote ---
Hi LaserTazerPhaser
Page 3 of the datasheet say Vin is 2 to 20V, but being a boost switcher, Vin can never be more than Vout.
Zero999:
--- Quote from: LaserTazerPhaser on January 16, 2019, 01:07:41 am ---This is a great inexpensive boost chip https://datasheet.lcsc.com/szlcsc/1811201211_hengjiaxing-HX3608_C296278.pdf but im not sure if it will accept up to Vin max for VEn pin. It says the minimum is 3.6v for VEn but it doesn't say maximum for the pin. Typically for swhiching ICs its up to Vin max but Im not sure about this part.
--- End quote ---
The application schematic shows EN connected to Vin, which implies En is rated up to the supply voltage.
The minimum voltage for EN isn't 3.6V, but the voltage at IC's GND pin.
The thresholds for EN are only specified for a 3.6V supply.
In reality, EN can probably be slightly higher than VIN and slightly lower than GND without causing any issues: +0.3V above VIN and -0.3V below GND is probably acceptable.
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