I have a Pololu 12V step-up converter (U3V12F12) that I'm powering with a 3.7V 6600mAh lipo battery.
The idea was to use it to power a dev board that requires a 12V input. The dev board draws about 250 - 300mA when hooked up to my powerbench @ 12V
Input / output current
The pololu description mentions input and output current.
- Input current can typically be as high as 1.4 A.
- Output current is a function of the input voltage, output voltage, and efficiency
I understand that the output current is what the board will ask for (as on my powerbench I suppose it would be around 250 - 300mA). But what about this input current ? How much would my Lipo battery be able to deliver ? what exactly do I to take into account here ?
Looking at the datasheet I noticed on the 12V graph that that green line (representing 3.3V input) stops at round 280mA. Does that mean that this represents the absolute maximum ?
When hooked up that to the board I noticed a lot of current going through the step-up (up to 1,6A), and that there were lots of voltage drops, resulting in frequent reboots of the board.
Do I need the 12V Step-Up Voltage Regulator U3V50F12 instead to power the board, or are there other alternatives ?
Also, is it safe to directly hookup a battery to the VIN/GND connectors or do I need some other protective circuitry to protect the battery from reverse voltage spikes or excessive current draws ? The description mentions "Please be wary of destructive LC spikes that might cause the input voltage to exceed VOUT" As Vout = 12V and my battery is only 3,7V, should I be worried ?