BQ24070: Output voltage drop from 2.5V to 0.6V in 3 sec

Measure at BAT pin

Hi,

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Just to clarify, you mentioned the following:

Chan PK1 said:

50% (10 pcs) unable to charge (output 0.6V)

When you say output, are you referring to the output pin? Or the battery pin?

If this is the output, this could be due to DPPM where the output drops below the V(DPPM) x SF voltage and so battery charging becomes reduce. Is your voltage input capable of supplying enough current to both the OUT load and the battery charge current? This can be the reason your output is dropping and the battery is not charging. 

Thank you for the reply.

R(DPPM) try for 37.4K / 33K / 30K ohm. All the results is the same. See the schematic and the voltage at BAT pin.

We have 20 pcs of this and we use all the same circuit. Only 10 pcs able to works as normal. Another 10 pcs unable to charge. We try to swap IC with out PCB, results; the same IC still does not works. E.g. PCB1 IC1 (can charge), PCB2 IC2 (cannot charge), -> PCB1 IC2(cannot charge), PCB2 IC1 (can charge)

Is this voltage normal? Measured at BAT pin without battery attached. Using R(DPPM)= 33k. Can you please advice the most suitable R(DPPM) for this (3.7V Li batt)?