Hi Team,
Our customer are evaluating TPS61281A at the following conditions.
However, the power good repeats “High” and “Low” at Vin=Vout and Iout=35mA.
They are understanding that this case is the abnormal operation.
Additionally, according to our customer, this phenomenon does not occur at Vin>Vout (bypass operation) and Vin<Vout(boost operation).
And, if no load(output of TPS61281A is open), this phenomenon does not occur at Vin=3.0V to 4.2V.
Therefore, they would like to know the cause of this abnormal operation.
May the power good output become “Low” when Vin=Vout?
[Conditions]
-Vin=3.35V
-Vout=3.35V
-Iout= 35mA
-Cin=4.7uF
-Cout=22uF
-VSEL=High (connected to VIN through 100kohm.)
-EN=High (connected to VIN.)
-/BYP=High (connected to VIN through 100kohm.)
-MODE=Low (connected to GND.)
-PG is connected to VIN through 100kohm.
If you contact to below my e-mail address or let me know your e-mail address,
I can send the customer information (measuring waveform).
I’m looking forward to hearing from you.
[my e-mail address]
Regards,
Kanemaru
