Tool/software:
Dear Forum,
We are using TLV61070A as a boost controller for powering LEDs from a Pack of 2 AA Batteries.
The Controller is set to output 3,95V nominal, the LED Array consumes 168mA max.
LEDs are controlled by a small controller, so are that they are switchend on with a delay to prevent additional load on the chip's output during start-up phase.
In our design phase everything works as intended, during power down (EN, Pin 3 is less than 1µA.
After operating the device for a few weeks, some ran out of battery very quicky even if they didn`t operate the LEDs.
Measuring the consumption in power down was surprisingly high. Consumptions from ~1mA to 16mA were observed at more than 1/3 of our 350 testing device.
We stripped away everything on the board leaving only the TLV61070A but still the consumption was there so we are quite sure that it is caused by the TLV61070A.
we measured the SW pin with a scope but no action can be seen there as well as the output Pin Vout where also no output voltage can be observed. EN is pulled to GND via a 100k Resistor.
What could be the reason the converter is drawing this kind of current when not operating?
Here is our schematic of the converter:
And here the Layout:
Thanks for your help!
Stefan
