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:
  1. Over-current limit
  2. Output short-circuit protection
• Functions:
  1. Soft-start
  2. Load Disconnection Function
  3. Auto Discharge Function

Datasheet

MCP73831 Datasheet

PAM2305 Datasheet

XC9141 Datasheet