PL02 - 3.7v LiPo Battery Power Supply Solar (MCP73831, PAM2305 & XC9141)
Overview
This xCHIP charges a 3.7v LiPo battery via power input from a Micro USB power source. Unless connected to this Micro USB power source, the circuit draws power from the LiPo battery and supply the xBUS with power.
The on-board MCP73831 LiPo battery charging IC offers a simple and efficient battery charging solution with various features, such as Auto Off, Cell Preconditioning, Cell Temperature Monitoring, Reverse Polarity Protection, Status Indication and Under Voltage Protection/Brown-Out. It is capable of charging the battery at a rate up to a maximum of 500 mA.
The equipped PAM2305 is a step-down current-mode, DC-DC converter. At heavy load, the constant frequency PWM control performs with excellent stability and transient response. To ensure the longest battery life in portable applications, the PAM2305 provides a power-saving Pulse Skipping Modulation (PSM) mode to reduce quiescent current under light load operation to save power.
The XC9141 series used for input conversion from the solar panels is a synchronous step-up DC/DC converters which can supply a highly efficient and stable current up to 0.8 A. The series is able to start operation with inputs as low as 0.9 V which makes it ideally suited for small solar applications.
Product Highlights
- Solar Panel Charging Support on VIN ☒BUS
- 1 A Continuous Output Current
- Micro USB Charging
- LED Charging Status Indicator
- 500 mA Battery Charging Capacity
- Supports Various 3.7V LiPo Batteries via 2.54 mm Pitch Solder Points
- Charging Auto Off
- Cell Preconditioning
- Reverse Polarity Protection
- Under Voltage Protection, Brown-Out
Specifications
MCP73831
- 500 mA Continuous Battery Charging Current
- Auto Off
- Cell Preconditioning
- Reverse Polarity Protection
- Status Indication
- Under Voltage Protection, Brown-Out
PAM2305
- Efficiency up to 96%
- Only 40µA(typ) Quiescent Current
- Output Current: Up to 1A
- Internal Synchronous Rectifier
- 1.5MHz Switching Frequency
- Soft Start
- Under-Voltage Lockout
- Short Circuit Protection
- Thermal Shutdown
XC9141
- Oscillation Frequency : 1.2MHz
- Input Current : 0.8A
- Output Current : 350mA
- Protection Circuits:
- Over-current limit
- Output short-circuit protection
- Functions:
- Soft-start
- Load Disconnection Function
- Auto Discharge Function
Datasheet