BQ25700A: Datasheet

Allard Baalen van

Prodigy 160 points

Part Number: BQ25700A
Other Parts Discussed in Thread: BQ25700

I want to use the BQ25700A in a new design but there are some things unclear, please help me with the following points:

In the data sheet there are no thermal pad dimensions specified, could someone specify these?
I want to use a 4.7uF Inductor, is this value allowed? And if so, what would be the IADPT resistor value?
How should the ILIM_HIZ voltage divider resistor values be determined, and what is the function of this pin, only placing/releasing IC from HIZ mode or more?
There is also an independent comparator with the CMPOUT and CMPIN pins but how could it be used and where could it be used for? there is very little information in the datasheet about this.
Also looking at the parameters of the BQ25700 http://www.ti.com/product/BQ25700A/description, under special features is stated; "Solar Input" but the word solar is never used in the datasheet so what or where is this solar input?

Thanks,

Allard

over 8 years ago

0 Wang5577 over 8 years ago

TI__Guru 56650 points

We will update the datasheet and add the following thermal pad drawing.

bq2570x Thermal pad drawing_qfnd189e.pdf

0 Wang5577 over 8 years ago in reply to Wang5577

TI__Guru 56650 points

Please use 3.3uH instead of 4.7uH.
ILIM_HIZ equation is in the datasheet. V(ILIM_HIZ) = 1 V + 40 × IDPM × RAC
CMPIN, CMPOUT is an independent comparator. Can be use for any purpose you want to.
Solar application typically needs input voltage regulation (Vindpm function) to keep input voltage operating at solar panel's maximum power point. bq25700A supports the wide range Vindpm. So, it can support solar application.

0 Allard Baalen van over 8 years ago in reply to Wang5577

Prodigy 160 points

Thank you Wang for the information.
I think I over-read the line "in which IDPM is the target input current" in datasheet, with the equation it is all clear now.

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BQ25700A: Datasheet