The MCP1700 is one of my favourite low drop out regulators for a very low sleep current node. These regulators should only consume around 1uA or so when the processor on a node is put into deep sleep. Total deep sleep current of around 2.0uA is the norm.
I was working on a small node with a DIP version of the ATmega328 and a MCP1700 regulator. The deep sleep current worried me, it was maybe 50uA. I could not work it out. I pulled the node to bits and eventually worked out the problems was the so called MCP1700 regulator.
I had recently bought some ‘MCP1700s’ from that web site that does not offer ‘express’ delivery and perhaps does not sell ‘A’ class products.
I tested the bag of MCP1700s I had recently aquired and these were the queiscent currents, the node was a bare bones ATMega328P, LED, MCP1700 regulator and capacitors;
Ouch not quite to MCP1700 spec which is 1.6uA typical.
So I tested some MCP1700s I had bought from Farnell\Element14, the results of testing these was;