I am developing a battery powered application. I need GSM communication there. The problem is that in most (I think every even) devices I find the required voltage is from 3.4V to 4.2V. I would really prefer the module to work on 3.3V steadily. Are there such modules? If not, what is the technological obstacle here? I would appreciate all help.
closed as off-topic by Brian Carlton, Enric Blanco, Voltage Spike, Dmitry Grigoryev, PeterJ Jul 11 '17 at 12:36
This question appears to be off-topic. The users who voted to close gave this specific reason:
- "Questions seeking recommendations for specific products or places to purchase them are off-topic as they are rarely useful to others and quickly obsolete. Instead, describe your situation and the specific problem you're trying to solve." – Brian Carlton, Enric Blanco, Voltage Spike, Dmitry Grigoryev, PeterJ
Simply add a boost converter to convert your 3.3 volt source to the voltage required for the GSM module.
They are designed to run of a single lithium cell. Like all phones do. They sometimes provide the charging and management circuitry as well.
If you want a different battery chemistry, you will need your own power supply circuitry.