Other Parts Discussed in Thread: TLV7034
Tool/software:
Hi.
I have a very low power design where I used this part. It pulses two LED's 30ms apart for 20ms each every 6seconds as illustrated.
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The circuit is power from 4xAAA Duracell Optimum batteries. The white LED's are driven through a 1kOhm limiting resistor each with a N-Ch MOSFET each to not load the CD40106.
The average current using the CD40106 is 190uA. Replacing the CD40106 with a HEF40106 from NXP, the average current drops to 70uA.
I have tested several circuits with each manufacturers' part and there is very little variation.
This 120uA variation results in a 2year reduction in battery life.
Per your datasheet, the quiescent current is a max of 2uA at 0-10V at 25degC.
Attached is a picture of the chips used.
Is there an explanation for the large variation?
Your assistance will be appreciated as we have a few hundred of the units in stock and customers return them due to the short battery life.
Best regards
Chris