Hi! I’ve developed a board that uses MP2722 to charge a li-ion cell and supply power to a DC-DC boost converter.
When i connect a battery to the system, i get the 5V output, that means the MP2722 is supplying the boost converter, but when i connect a USB-C charger, i get no charging.
Moreover, if i use a non-PD, 5V charger, i get a 1Hz blink from the status LED, that is connected to the STAT/IB pin as you can see from the schematic below, that means the IC is in fault.
If i use a PD adapter, i get strange blinks every 5 seconds but not always.
If i don’t connect a battery and i connect the 5V charger, i get full on LED.
The battery has no NTC sensor, so i connected a 10k resistor between T_BATT and GND to simulate it.
What is happening here?
Thank you for your help.
Hi Marco,
Apologies for the late response. Taking a look at your schematic there is nothing that stands out to me.
You are correct, the 1 Hz blink from the status LED indicates a fault. Can you provide what your fault code is? You can check for faults by accessing the BOOST_FAULT [0/1/2] registers. The “full on” LED when connecting to a 5V charger indicates charging is complete and will disable the charger.
Since you are using a 10k resistor to simulate an NTC sensor, the mode you are operating in may be throwing a fault there, I would advise you to check the NTC_MISSING or NTC1/2_FAULT [0/1/2] registers.
Hopefully this can help you narrow down where the issue might be.
Best,
Stephen
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