What's the range of input voltage needed to get 5V output in the LM2577 CC-CC step up module?
griffnater:
What's the range of input voltage needed to get 5V output in the LM2577 CC-CC step up module?
Have a link to the device in question..?
I saw it here
But I don´t know if one 3.7V baterry with, for example, 2000mAh it's enough to get 5V output for some hours or would it be better to use two 3.7V batteries in series.
Can the boost converter still get 5V output with 7V input (2 batteries in series)?
Bit of conflicting information in the site you linked to which says supply 3 to 32v as against the spec sheet which says 4.5 to 40V ....in fairness the first did say (best working range 5v to 32v).
You could try just the one 18650 cell (assume that is what you are using) and see how it goes.
They are very efficient units.
You say you have a 2000mAh cell but that is no indication of how long it will last between charges unless you provide the current draw.
Specs.....
Vin (Min) (V) 4.5
Vin (Max) (V) 40
Vout (Min) (V) 3.3
Vout (Max) (V) 37
Iout (Max) (A) 3
Regulated outputs (#) 1
Switching frequency (Min) (kHz) 110
Switching frequency (Max) (kHz) 173
Features Enable, Over Current Protection
Control mode Voltage Mode
Duty cycle (Max) (%) 100
Type Converter
Operating temperature range (C) -40 to 125
The circuit will consume around 130mA and maybe i will use one with 3.7V and 2600mAh