BQ27426: schematic review

Denny Huang

Expert 7170 points

Part Number: BQ27426

Dear team

Could you help to review the schematic?

Many thanks

Denny

over 2 years ago

0 Jessica H. over 2 years ago

TI__Genius 11535 points

Hi Denny,

It looks like they are missing connectors for a load/charger. Also they need to Kelvin sense connect SRP to the positive battery terminal (PACKP) side of the external sense resistor and Kelvin sense connect SRN to the other side of the external sense resistor, the positive connection to the system (VSYS). Please have the customer refer to the schematics in the Datasheet and EVM User's Guide for these connections.

Best,

Jessica

0 Denny Huang over 2 years ago in reply to Jessica H.

TI__Expert 7170 points

Hi Jessica

Thank you your recommend.

1. The customer have modified the circuit. Is the schematic ok?

In the datasheet reference circuit :

Figure 10. Typical Application with High-Side Current Sense Resistor .

2. Figure 11. Typical Application with Low-Side Current Sense Resistor. In the EVM reference circuit diagram is High-Side. Is the High-Side more recommended

Will High-Side consume more power?

Many thanks

Denny

0 Jessica H. over 2 years ago in reply to Denny Huang

TI__Genius 11535 points

Hi Denny,

I don't see any changes to the schematic.

Both high side and low side sensing work for this gauge so both are recommended. The power consumption should be similar.

Best,

Jessica

0 Denny Huang over 2 years ago in reply to Jessica H.

TI__Expert 7170 points

Hi Jessica

Sorry, I update the mistake file.

Please help to review the updated schematic as below. Update R78 to High-Side Current Sense Resistor And change SCL and SDA Pullup Resistors to 10K (originally 4.7K)