EE USB Battery Power Management

Introduction

This is a straightforward open-source hardware project, USB-BATTERY, designed for low-power applications with a battery. It features dual power supply capabilities, including battery supply and charging, as well as advanced low-power management.

User Mannal

As shown in the figure above, the USB-BATTERY is a compact power module that can be mounted onto a breadboard. Below is the definition of the blocks or ports of the module:

1. PWE_1: Power Input 1 with USB TYPE C socket (Support PD Charging);
2. PWR_2: Power Input 2 with 2.54mm Header;
3. IO_BAT: The IO_BAT Port is used for power on/off and battery connection. The pin is defined as following "IO|GND|GND|BAT";
4. OUT: 5v and 3v3 power output;
5. IO_KEY: Turn On/Off of power output(active low);
6. IND: LED indicators with "PWR","CHG", and "STD";
   • PWR: ON-Power output Enable; OFF-Power Output Disable;
   • CHG: ON-Battery is charging; OFF-Battery missing or charged;
   • STD: ON-Battery is charged or missed;

Schematic

The following link is schematic(.pdf) for the project. USB_Battery_PM_Schematic

PWR_1

R1 and R2 are used for PD Charging identification;

PWR_2

Power input port 2 with reverse connection protection;

Power MUX

Power Multiplex which guarteen only one power supply input vaild at the same time;

ON/OFF Control

Low Power Switch Control which is triggered by the falling edge of Enable siganl.

Boost Converter

Boost the voltage to 5V with battery supply.

Battery Charger

Linear Battery Charger;

BOM

The following link is BOM(.csv) for the project. USB_Battery_PM_BOM

PCB Layout

The following link is PCB Layout(.pdf) for the project. USB_Battery_PM_PCBlayout

Performance

• Quiescent Current: 90uA;
• Battery Charging Current: 390mA;
• Maximum Output Current @5V : 1.5A;
• Maxumum Output Current @3.3V : 300 mA;

License

The project follows MIT Open-Source License;