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spacelab-ufsc / edc-power-adapter

EDC power adapter board
GNU General Public License v3.0
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Define the power switch IC #2

Closed mgm8 closed 4 years ago

mgm8 commented 4 years ago

Some requirements:

YanAzer commented 4 years ago

First options found:

  1. NCV8452STT3G
  2. ITS4200SMENHUMA1
  3. TPS1H000AQDGNRQ1
  4. ISP762TFUMA1 Input turn-on threshold voltage: 2.2V?

If a lower Max. input voltage be considered (like 5.5V) there will be much more options for the power switch, most of the ICs with Max. input voltage >= 10 V and encapsulated protection require minimum 5.5V to operate normally.

mgm8 commented 4 years ago

@YanAzer can you check this one: TPS22919-Q1?

YanAzer commented 4 years ago

@mgm8 thanks, i saw your sugestion and it seens to be the simplest solution. I also found some other ones:

  1. TPS2065-Q1
  2. NCV8450ASTT3G

I think TPS2065-Q1 is a more suitable solution because has undevoltage and overcurrent protection, the function "Fault Report" can be ignored if not used, the only downside is the maximum voltage operation 5.5V. While NCV8450ASTT3G has a larger voltage operation (4.5V ~ 45V) and overvoltage protection, i didn't find the enable voltage on the IN pin on the datasheet. Looks like most higher power switches with minimum 5.5V operation has overvoltage protection, but i don't think this will be a big concern for us.

YanAzer commented 4 years ago

@mgm8 i also found other option and that has overvoltage protection, this was one of the only ICs found that could give this feature with minimum operation voltage of 4.5V:

Unfortunately it seems the typical operation voltage is 13V, way above your application that is ~5V.

mgm8 commented 4 years ago

@YanAzer the TPS2065-Q1 has a thermal pad, which difficults a bit the assembly process of the board. Also, the TPS2065-Q1 has two separated inputs with a single enable signal. From this family, the best model would be the TPS2062-Q1, with a single input and two separated enable signals.

I think we can choose the TPS22919-Q1 for now.