Hi all,


I am using a micro controller with 2 AAA battries. MCU is in deep sleep mode for approx. 1 sec then wakes-up upon hal sensor interrupt, then MCU triggers a coil using BSS138N MOSFET. While sleeping MSP consumes 1uA and .5mA when woken up. Current cosumption when coil is triggered: 3mA for 200ms

Now, I realize that I need more volts for this coil than 3 volts. MOSFET is connected to external power supply of 9V to 12 Volts and works great.

I am looking for a DC/DC converter suggestions. Below is my wish list:

Extremely low BOM, preferably includes some sort of switch so I don't have to use BSS138N, extremely low current consumption when sleeping, module for factor also acceptable as long as it is not BGA.


Thank you very much,
Jay

 

Many of the Maxim nanoPower boost converters, eg MAX17222, MAX17224, feature <1nA standby yet can handle 0.5 -5v input and up to 1A output with an ~4 part BOM. Best go to http://maximintegrated.com and search the parametric switching regulator database. 9v output might be difficult though at 3v input...