Hello
I am designing with an image sensor and I need a 1V supply of 1mA. In the datasheet it says that the voltage source should have the ability to pull current, so should be designed as a current sink. Can someone tell me what exactly they are looking for? I understand the concept of a current sink, just not in this context.
Thanks
Hello Jon, thank you for posting your question.
This sounds like you need to supply a positive current of 1V at 1mA to some load.
But it also seems that the load can be a source that would tend to force the 1V higher.
In this case the 1V 1mA regulator would need to be able to sink current, trying to hold the 1V constant.
DDR memory VTT termination is an example of a "source / sink " requirement.
LP2997 is a LDO that can both source and sink current.
In the picture below, blue is the normal SOURCE mode, red is the sink mode.
This is designed such that Vout (VTT) is equal to Vin (VDDQ) / 2. For DDR application VTT=VDDQ/2
So if you supply VDDQ = 2V then VTT will be 1V and +-0.5A
You can attach your sensor specification by using Rich Text Formatting feature, bottom right of this box.
Does this help?
