A small low-voltage voltage converter is often used for the manufacture of so-called external batteries (power bank). The fact is that for the charge of most modern electronic Gadgets need a voltage of 5 V, and this board makes 1.8-4 V 5 V.
It is very convenient to use a USB cable to output this device. Due to the possibility of low input voltage, this step-up converter can be used to convert voltage powered by finger-type batteries / disposable current sources, but usually Li-ion / Li-Po batteries are used as rechargeable batteries.
I made some measurements of currents and voltages and calculated the efficiency for this converter. At the input there was one element of size 18650 from a laptop battery with a voltage of 3.98 V, the current consumed from it was 1.64 Amps. At the output, I got 5.11V with a current of 1.08A, which is pretty good. Total Efficiency:
=(5.11V * 1.08A) / (3.98V * 1.64A) = 5.51W / 6.52W= is a good result. Of course, during operation, the microcircuit and the inductor were heated, but by installing the entire board on the radiator, we will solve this problem.
Input voltage: 1-5V
Output voltage: 5.1-5.2V
Output current: up to 1.5 A
Efficiency: up to 96% (the higher the input voltage, the higher the efficiency)
Converter Frequency: 500 kHz
Output voltage ripple: 30 mV (MAX) Bandwidth 20M (input 4V output 5.1V 1A)
Indication: the LED blinks when the power is connected and constantly lights up if the load is also connected
Working temperature: (-40 ° C to + 85 ° C)
Standby current consumption: 130 μA
Dynamic response speed: 5% 200 μs
Short circuit protection:
Pre-Polarity Protection: Not
Cost: ~ 209