LifePO4 USB Charger PCB for Microcontrollers

It provides constant voltages at the battery output. As a power source for a charge, the device can be connected to a solar panel, USB cable

The electrical systems or microcontrollers, work with a power supply. they need continuous power to work in a flow without any delay. In systems where power is the main source of the operation like in robots, there the batteries get drained after some time of operation.

LifePO4 cells USB charger provide supply to the batteries to get charged during the operation. Connect your LifePO4 battery to the developer board (Arduino, RPi, ESP32) and connect the LifePO4 USB charger. Your system will probably never get drained because you have a constant power supply that charges the battery. For instance, for toy cars, get 2 same batteries and charge them to maximum capacity. When first get drained, place it in the LifePO4 USB charger and use another cell for toy car testing. The first battery will get charged before the second gets drained! LifePO4 USB charger is in basic MPPT tracker which can easily sustain solar panel up to 16V open-circuit voltage at LifePO4 USB charger input.

Hardware Components:

1. MPPT LifePO4 IC Charger
2. Male header 2pos 2.54mm
3. Ceramic capacitor 16V, 22uF 0805
4. Ceramic capacitor 50V, 0.1uF 0805
5. Ceramic capacitor 50V, 0.22uF 0805
6. Resistor 1%, 0.125W 0805, 43k
7. Resistor 1%, 0.125W 0805, 15k
8. Resistor 1k, 0.125w, 0805
9. Resistor 91mOhm, 0.33w, 1% 0805
10. Resistor 43K, 0.125w, 0805
11. Resistor 120Ohm, 0.125w, 0805
12. Resistor 5.1M, 0.125w, 0805
13. LED 0805
14. Schottky array
15. PMOS
16. Schottky Diode 30V 2A
17. Inductor 10uH
18. Micro USB-B connector
19. Battery Holder

Software Tools:

• Inventhub
• Altium Designer

LifePO4 USB charger can be used in different modes of operation when a power source is provided. The main goal of the LifePO4 USB charger is to provide the constant voltage at battery output. The components in the block diagram include:

• USB micro-B to connect USB cable
• MPPT device to provide constant voltage at outputs BAT+ and BAT-
• LED is used for the charging indicator
• Segment for selecting D- output pin to connect with D- of USB micro-B and MPPT pin
• Four pads output for BAT+, D- selected from segment 4, D+ directly from the micro-B USB connector, and GND
• Battery output

To design a schematic diagram, I have used a CAD software named Altium Designer. For user designing and at the time of manufacturing, it sometimes gets difficult to implement the exact design as per requirement. In order to avoid this inconvenience, I have uploaded all my design files including the schematic file online on Inventhub.

At the time of fabrication and final implementation of the design board, it’s important to take care of routing, board and components dimensions, their symbols, and footprints. I have created my PCB board and then I have uploaded it on Inventhub. 

I have created a Release of my project on Inventhub where my whole project is available in ZIP file format. This will help users and manufacturers to reach their exact final design.

After receiving my fabricated board, I need to embed the components on it. Instead of visiting my component provider manually and telling him the dimensions and quantity manually, I will send him my BOM file (which will be containing each and every detail of my components) uploaded on Inventhub. He will download that file in CSV format and will deliver my components.

To get complete how-to and detailed information on the project design and implementation visit this link:

Complete Project link