BQ24765: Detailed Design Steps and Design Tool for BQ24765

Thomas CN1

Part Number: BQ24765

We were checking for the detailed design procedure in BQ24765 battery charger data sheet. The data sheet section 9.2.2 Detailed Design Procedure says as below:

The parameters are configurable using the evaluation software, SLVC309. The simplified application circuit (see Figure 17) shows the minimum capacitance requirements for each pin. Inductor, capacitor, and MOSFET selection are explained in the rest of this section.

1. We downloaded the SLVC309 software by clicking on the Hyperlink in data sheet. But we are not able to install the same. The installation throws error as 'invalid line in setup information file'. Is there any working design software tool available for BQ24765?

2. If no design software tool available, is there any excel based design sheet available for BQ24765?

3. The data sheet then mentions as ‘Inductor, capacitor, and MOSFET selection are explained in the rest of this section’. But we don’t see any such explanation about the components selection / calculations given in the data sheet. Is there any document available which explains the detailed design steps for BQ24765?

Regards,

Thomas CN

over 2 years ago

0 ezhao over 2 years ago

TI__Genius 10240 points

Hi Thomas,

1. This software was released in 2008 and it might have some compatibility issue with the current laptop operation system.

2. We don't have other excel design available.

3. For the design, is Table 1 good for your design? There is no need for MOSFET selection as the FETs are integrated.

Due to this part is a legacy one, we have very limited design resources. Thanks for your understanding. Please make sure you can get the BQ25765 considering the current semiconductor supply constrains.

Best regards,

Eric

0 PRAHLAD Supeda over 2 years ago in reply to ezhao

TI__Expert 4955 points

3617.SmartBatteryCharger_BQ24765.pdf

Team,

Customer requested to attach the schematic for review comments. Please help to review same.

0 Thomas CN1 over 2 years ago in reply to PRAHLAD Supeda

Intellectual 300 points

Hi TI Team,

Request your support at the earliest. Please review the attached schematics and give the feedback.

0 Pengzhao Zhu over 2 years ago in reply to Thomas CN1

TI__Genius 11385 points

Hi Thomas,

I think it looks good overall. A few comments:

1. Recommend checking your ACIN resistive divider value. I couldn't see the input voltage on the schematic.

2. I believe the Q24 circuit is a circuit for reducing inrush current. I think it is good that this was taken into account.

3. For CE pin, if R445 is DNP and R484 is used for pulldown until CPU outputs logic high, then it is ok. Otherwise it becomes a voltage divider.

4. Make sure there are pull-ups somewhere on the design for the I2C pins.

Thanks and I hope this helps,

Peng

*Please press "This Resolved My Issue" on the thread if my answer is satisfactory

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BQ24765: Detailed Design Steps and Design Tool for BQ24765