BQ25616: BQ25616 charge current low

Star Xu

Part Number: BQ25616
Other Parts Discussed in Thread: BQ25606

My customer design the schematic of BQ25616. After the OTG pin is pulled low (the SATA&PG light is always on when the power is turned on), but the charging current is very small.

Attached the schematic for your reference.

BQ25616 (1).docx

The D+ D- is floating, and they want the charge current is 2A.

Can the above circuit achieve 2A charging current？

Thanks

Star

over 4 years ago

0 Ning T over 4 years ago

TI__Guru 54651 points

Star,

Please visit https://e2e.ti.com/support/power-management/f/196/t/890626 for BQ25606: Schematic Review and PCB Layout Design Tips. Additional Information including FAQs is available http://www.ti.com/lit/an/slva924/slva924.pdf Designing A Standalone Single Cell 3-A Charger with the bq25606. BQ25616 is similar to BQ25606.

ILIM sets the input current limit when the input adapter is detected as unknown (i.e. D+/D- pins are open).

Please check if STAT pin indicate any faults and debug from there. STAT pin blinks 1Hz when Charge suspend (input overvoltage, TS fault, timer fault or system overvoltage).

Please also check if the input source is over-loaded, either the current exceeds the input current limit or the VBUS pin voltage falls below the input voltage limit.

When the input current limit or input voltage limit is reached, the device then reduces the charge current until the input current falls below the input current limit and the input voltage rises above the input voltage limit. Please refer to Extract maximum power from the supply when charging a battery (http://www.ti.com/lit/an/slyt569/slyt569.pdf) and 9.3.6.2 Dynamic Power Management on https://www.ti.com/lit/ds/symlink/bq25616.pdf for the details.

Thanks,

Ning.

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BQ25616: BQ25616 charge current low