LiPo Power Board is a power manager for your battery-powered product. Since the breakout format, it is intended for prototyping and development. It is designed for a single cell LiPo battery (3,7V) and to supply 2 voltages: a fixed 3.3V and a secondary adjustable output, able to deliver higher voltage and current. A physical switch allows you to cut out the voltage on both channels. USB-C and Jack connectors allow to recharge the battery up to 1A.
The boost part is very flexible since you can just change the ratio between 2 resistors to change the voltage output. Moreover you can copy and paste it to get a third voltage output.
A typical application in which this board finds a perfect suit is where the MCU runs at 3.3V and sensors and actuators (such as LEDs WS2812B) requires higher and stable voltage.
You will need hot air gun for fine-pitched components such as USB-C and MCP73837.
This circuit is designed to work with a battery always connected. For developing purpose, you may need to detach the battery. In this case, you may activate the LDO mode (available through USB-C only), shorting SEL2 and opening SEL1. Otherwise, in the default configuration (with battery) keep SEL2 open and SEL1 don't care.
The list of the pins and their functionality:
|3.3V||Regulated output at 3.3V|
|VBAT||Unregulated battery voltage|
|5V||Regulated output at 5V (adjustable)|
|PWR||Output HIGH after 200us the 3.3V is stable, otherwise grounded|
|SON||Set HIGH to activate the voltage regulators, LOW to turn off them. It is an alternative to the physical switch|
Each printed board has a version. Version advancements are ruled accordingly to Semantic Versioning.
To show the status of each version I use the following symbols:
|6||DC Jack Barrel||J1||DC POWER CONNECTOR CLIFF DC10L FC681465||1|
|19||Screw terminal 2pin||P1||1X02_2.54_SCREWTERM||1|
|22||Just a couple of 2.54-spaced pins||SEL1,SEL2,EXT_BTN||1X02 2.54MM HOLES HEADERS PINS||3|