We are using MP2690 in a handheld battery device. We noticed following symptom:
- Put the part in to Boost mode;
- Insert 5V into VIN, part is switched to pass-through mode;
- Remove supply to VIN & load at output;
- Part should go into Sleep mode & VNTC should turned off, but VNTC remained ON.
As we are using the load detection circuit described in MP2690 specification, VNTC not turning off will cause the circuit to be unfuctionable. We try replacing VNTC source in the load detection circuit to SYS, it didn’t work as well.
We would like to ask MPS if there is a workaround on this matter, as we didn’t include a button in design.