BQ25606: charging current is not as expected

Roman P.

Part Number: BQ25606

Hi everyone,

I have problem with this charger IC - charging current always 750mA, in case of any type of charger adapter ( with fast charge 9, 12, 15V, old 5V only, or even 5V from PSU).

And even IC can't detect charger type I'm expected 1A charging current. When I try set lower values for R23 and R26 to increase charging current BQ25606 becomes unstable - STAT LED starting blinking (5-7Hz) and

charging current goes to zero.

Without battery STAT blinking at 1Hz, In OTG mode I have 5.1V output with 0.8A load (haven't tested with higher currents).

Schematics below:

I would appreciate any help

UPD: C13 and C15 are located close to the IC, and C19 is the closest. I have two boards, and both with same behavior.

over 5 years ago

0 Ning T over 5 years ago

TI__Guru 57541 points

Hi,

What are your test conditions such as VBUS, VBAT, IBAT, VSYS, ISYS?

Thanks,

Ning.

0 Roman P. over 5 years ago in reply to Ning T

Prodigy 30 points

Vbus = 4.95V, Vbat = 3.75V (3.87V when charging), Ibat = 0.75A (charging), Vsys = 3.85V, Isys = 0.002A.

0 Roman P. over 5 years ago in reply to Roman P.

Prodigy 30 points

Found problem by myself. After few iterations of copper pouring on PCB bulk capacitors was appear on thermal reliefs. After connecting capacitors directly to ground plane schema works good.

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BQ25606: charging current is not as expected