INA219: INA219 vs INA3221

Part Number: INA219
Other Parts Discussed in Thread: INA3221, INA226, INA231, INA233

Hi Team,

I work on a new board – POWER MNG BOARD.

12 output powers with:

1. 1 x 0.7V @ 20A
2. 2 x 1.8V @ 12A
3. 3 x 3.3V @ 6A
4. 3 x 3.3V @ 3A
5. 3 x 0.9V @ 5A

I would like to measure the current and the voltage of every output power.

I would like to use INA219 or INA3221, but they really confuse me (I’m not sure witch of them is with high accuracy)

As I understand from the datasheet:

INA219:

1. ADC of 12bit
2. 1 chanel  
3. Current measurement error =0.2% to 0.3%
4. Bus voltage measurement error = 0.2% to 0.5%
5. Full-scale current sense (input) voltage = +-320mV
6.  

INA3221:

1. ADC of 13bit
2. 3 chaneles
3. Current measurement error = ???
4. Shunt voltage gain error= 0.1% to 0.25%
5. Bus voltage gain error = 0.1% to 0.25%
6. Full-scale current sense (input) voltage = +-163.8mV

It’s seems that INA3221 better than INA219 if I will use with lower shunt resistor then INA219 ( half of the full scale current sense).

In my application I would like to measure the current with highest accuracy, which product from TI can let me the best accuracy? Which of them is recommended?

Thanks,

Shlomi