MCP73812 Battery Charger problem - Reverse-Blocking Protection
Hello I am using the MCP73812 to charge a small 130mAh battery.
I want to detect if the charger is plugged it so I use a simple circuit on the 5V rail that to detect if the voltage is present.
this doesnt work as there is always voltage present, even if the charger is not plugged in, despite having a 10k Ohm pull down on the 5V rail. If I pull the 5V down, i can measure a drain of 1.5mA, which is quite a lot and upping my pull down to draw so much current would have a very adverse effect on battery life of my device. [see Schmatic.jpg]
I was under the assumption that this would not happen ever as the datasheet says:
The MCP73811/2 provides protection from a faulted or shorted input. Without the protection, a faulted or shorted input would discharge the battery pack through the body diode of the internal pass transistor.
Is this something I am doing wrong or the datasheet doesn't specify a Reverse-Blocking Protection acceptable leakage current??
post edited by ems23 - 2019/07/21 12:16:27