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BQ24800: Can our BQ24800 support 20V12A application
The default sense resistor is 10mohms, the BQ24800 device provides an input-current limit range of 64 mA to 8.128 A.
However, resistors of other values can also be used, for example 5mohm can be used to increase the max current limit.
We have not evaluated the device at 12A charge current, so we can not guarantee if this will work, but I do not see any obvious reasons why this would not work.
The concern is that, if the input is 240W, in the case of fast charge, the efficiency of our buck converter may be 95% and the heat loss on MOSFET will be over 10W, which is a huge number and can cause the damage of MOSFET. Do you have any suggestion on it?
The concern is that, if the input is 240W, in the case of fast charge, the efficiency of our buck converter may be 95% and the heat loss on MOSFET will be over 10W, which is a huge number and can cause the damage of MOSFET. Do you have any suggestion on it?
I can't comment on the reliability of BQ24800 at 12A, because this has not been evaluated. A 5mohm sense resistor could theoretically be used to support 12A charge current, but this not a guarantee. This is something the customer would have to test.
In the block diagram there is a BQ25758 and BQ24800. Is there a reason why the customer does not want to use a BQ25750 to eliminate the need for both devices?
I removed the block diagram, because it had TI- Confidential Information, and this is a public forum.
