BQ24640: Questions about BQ24640 peripheral circuit

Jenson

Part Number: BQ24640

Hi team，

My customer would like to use BQ24640,but they are worried about efficiency. They refer to the circuit on the EVM board

As shown below，

I want to know if there is any solution that can replace P-MOS. Customers worry that using P-MOS will lose a lot of efficiency.

We want to replace it with an ideal diode (such as LM74700). Is there a feasible solution? Or is there another way?

thank

best regards

over 4 years ago

0 Kedar Manishankar over 4 years ago

TI__Mastermind 24075 points

Hi,

Please refer to this FAQ for how to decrease external component count: e2e.ti.com/.../791790

0 Jenson over 4 years ago in reply to Kedar Manishankar

TI__Intellectual 2295 points

Hi team,

I have read your instructions. If I want to further reduce power consumption, the customer wants to change Pmos to ideal diode and use ACDRV to control EN pin. Is this feasible? Or is there a better suggestion?

By the way, if BQ24640 wants to realize power path, can it only be realized by peripheral hardware like EVM board?

Thanks

0 Kedar Manishankar over 4 years ago in reply to Jenson

TI__Mastermind 24075 points

Hi,

When ACDRV is off it is held at VCC, so since the voltage levels of ACDRV aren't defined relative to ground, I would not use this to control the EN pin. The ACDRV is defined with relation to G and S of input reverse blocking MOSFET, so that when on the difference is -6V.

I didn't understand the 2nd question?

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BQ24640: Questions about BQ24640 peripheral circuit