Werner Almesberger wrote: > I wrote: >> 2) LDO delivers the extra current until thermal shutdown stops it. > > I did some measurements on a GTA02v4 with an overload condition on LDO4 > (BT_3V2): > > State LDO4 (nominal) Rload Ibat (Vbat = 4.2 V) BT_3V2 > --------------- --------------- ----- ------------------- ------ > Idle LDO4 = 0 V open 104 mA 3.29 V > Overload LDO4 = 3.3 V 10 R 422 mA 3.05 V > Short LDO4 = 3.3 V 0 R 510 mA 0.01 V
That makes 2.1W. Glad you stopped :) So I guess we can handle those peaks for a short time, can't we ? > > So the LDO does eventually limit the current, but around 500 mA, which > is considerably above the nominal limit of 150 mA. > > Note that the system didn't reset or crash during this experiment. The > PMU got fairly warm after a while, so I stopped. I wonder if, as last resort, we can put a NTC there. I am not sure such thing exists as SMT NTC however. Álvaro _______________________________________________ gta02-core mailing list [email protected] https://lists.openmoko.org/mailman/listinfo/gta02-core
