Other Parts Discussed in Thread: TPS706, , TPS783, TPS782
Team,
I have read the below blog entry:https://e2e.ti.com/blogs_/b/powerhouse/archive/2016/07/19/decrease-power-consumption-with-an-ldo
I still would need some clarification.
-What would be the best LDO choice for the below condition?
This is to power the RTC of the TI Sitara AM335x that consumers appr. 0.05mW.
- Vin 3.1V (coin cell)
- Vout 1.8V
- Iout: 30uA <x < 20uA
The quiescent current is important but the current consume by the LDO for operating is even more important to optimize the battery (coin cell) life time.
Seems that TPS71718 does empty the coin cell battery quite quickly. From the datasheet:
http://www.ti.com/product/TPS717/datasheet/specifications#SBVS0684020
Looking at Fig 9 it seems that the consumption (I GND) would be between 30 and 60 uA in the I out range that is of interest. So it consumes more than what the load consumes.
Seems that TPS706 would be a better fit:
http://www.ti.com/product/TPS706/datasheet/specifications#SLVS3381455
Looking at Fig 9 and 10 it seems that the consumption (I GND) would be between much lower than TPS717 30 in the I out range that is of interest.
Q1:Any more precise figures we can provide?
For TPS783 there is not such kind of Iout versus I GND curve:
http://www.ti.com/product/TPS783/datasheet/specifications#SBVS0834056
Q2:What would be the best LDO solution for this use case?
Thanks in advance.
Anthony
