Compiler/BQ25895: vbus input 5V2A or 3A, the charging current needs to reach 2A

user6330332

Part Number: BQ25895

Tool/software: TI C/C++ Compiler

1. When I use the VBS input to adjust to 5V2A and 3A, the charging current can reach 1.2A. Query all the register values are the same, not changed REG00=0x003f REG01=0x0005 REG02=0x003d REG03=0x003a REG04=0x002f REG05=0x0013 REG06= 0x005e
REG07=0x008d REG08=0x0003 REG09=0x0004 REG0A=0x0093 REG0B=0x0036 REG0C=0x0000 REG0D=0x008d REG0E=0x0000 REG00F=0x0000
REG10=0x0000 REG11=0x0099 REG12=0x0000 REG13=0x003f REG14=0x0039.
2. If the VBUS input reaches 6V2A, the charging current can reach 2A.
My demand is that when the VBS input 5V2A or 3A, the charging current needs to reach 2A, how do I modify the settings. Thank you

over 5 years ago

0 Ning T over 5 years ago

TI__Guru 57721 points

Hi,

Please visit https://e2e.ti.com/support/power-management/f/196/t/874557 for BQ2589X: Schematic Review and PCB Layout Design Tips and https://e2e.ti.com/support/power-management/f/196/t/875386 for BQ2589x/BQ25898x FAQs. FAQ#3 should help with you questions.

Thanks,

Ning.

0 Betty Guo over 5 years ago in reply to Ning T

TI__Expert 7300 points

Hi Ning,

As the BQ2589x/BQ25898x Top FAQs show, the DPM and maximum duty cycle will reducing ICHG.

In this case, The VINDPM and IINDPM status register are 0, it indicate that the device not in DPM mode.

and, set the VINDPM thresholds is 3.9V, and IINDPM threshold is 3.25A, the duty cycle is about 80%, it less than 97%. why is the charging current still be reduced?

thanks.

0 Ning T over 5 years ago in reply to Betty Guo

TI__Guru 57721 points

Hi,

What are VBUS(at VBUS pin), IBUS, VBAT, IBAT, VSYS, ISYS when VBUS=5V2A and VBUS=6V2A respectively?

Thanks,

Ning.

0 Ning T over 5 years ago in reply to Ning T

TI__Guru 57721 points

Hi,

We haven’t heard back from you for a while, the thread is considered solved and closed.

Thanks,

Ning.

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Compiler/BQ25895: vbus input 5V2A or 3A, the charging current needs to reach 2A