This is a charging and step-up Converter 2-in-1 Module for a single 18650 Lithium Cell with 5V Output to supply power to 5V devices. It provides continuous 5V Output, with the Lithium Cell as a backup for uninterrupted function in case of power loss (disconnecting of the 5V input).
The UPS-Function can be very handy for example to continuous power Programmable Logic Controller or Microcontroller Circuits when the input voltage is unstable or Brownouts/Blackouts happen too frequently.
If 5V output is only required temporarily (on demand), a switch can be connected to the pads marked with P5.
To charge the cell, a 5V power supply (min. 1A recommended) must be connected to either the USB port or the 2 pads marked with 5V- and 5V+ right to the USB port.
The 2 solder pads [+] and [-] on the edges in the middle of the PCB are directly connected to the Lithium Cell and can be used to connect our Single Cell Lithium Battery Gauge EAN 4260474034536 (blue) or EAN 4260474034550 (green).
Finally, the 2 solder pads marked with UPS- and UPS+, are the 5V Output. The maximum continuous current available on the output is 1000mA @ 5V.
There are 3 LEDs on the Module, showing the following information:
LED D2 (green) shows 5V output active
LED D3 (green) shows the full charge state
LED D4 (red) shows the active charging function
– Wires and the battery holder need to be soldered to the circuit board.
– For the always-on function, the jumper P4 can be closed with a drop of solder.
– A bigger capacitor (e.g. 1000µF) on the output can help to avoid continuous booting of a connected MCU or WiFi module.