MCP73871-1AAI/ML

Product Overview

Category

The MCP73871-1AAI/ML belongs to the category of battery charger ICs.

Use

This product is primarily used for charging single-cell lithium-ion (Li-Ion), lithium-polymer (Li-Po), and lithium iron phosphate (LiFePO4) batteries.

Characteristics

• The MCP73871-1AAI/ML is a highly integrated solution that provides complete charge management for single-cell Li-Ion/Li-Po/LiFePO4 batteries.
• It offers a constant current/constant voltage (CC/CV) charge algorithm, ensuring efficient and safe charging.
• The device supports a wide input voltage range, making it suitable for various power sources.
• It includes multiple safety features such as thermal regulation, overvoltage protection, and reverse discharge protection.
• The MCP73871-1AAI/ML is available in a small form factor package, making it suitable for space-constrained applications.

Package and Quantity

The MCP73871-1AAI/ML is available in a 10-pin MSOP (Mini Small Outline Package). It is typically sold in reels with a quantity of 2500 units per reel.

Specifications

• Input Voltage Range: 3.75V to 6V
• Charge Current Range: 15mA to 1000mA
• Precharge Current: 5% of programmed charge current
• Charge Termination Options: C/10 or C/20
• Battery Regulation Voltage: 4.2V (Li-Ion/Li-Po), 3.6V (LiFePO4)
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The MCP73871-1AAI/ML has the following pin configuration:

1. VBAT - Battery Voltage Input
2. PROG - Charge Current Programming Pin
3. STAT - Status Output Pin
4. PG - Power Good Output Pin
5. TS - Temperature Sense Input Pin
6. EN - Enable Input Pin
7. VSS - Ground
8. VDD - Supply Voltage Input
9. CE - Charge Enable Input
10. DP/DM - USB D+ and D- Data Pins

Functional Features

1. Constant Current/Constant Voltage (CC/CV) Charging: The MCP73871-1AAI/ML employs a CC/CV charging algorithm, ensuring optimal charging efficiency and battery life.
2. Thermal Regulation: The device incorporates thermal regulation to prevent overheating during charging, enhancing safety and reliability.
3. Overvoltage Protection: It includes overvoltage protection to safeguard the battery from excessive voltage levels, preventing damage.
4. Reverse Discharge Protection: The MCP73871-1AAI/ML prevents reverse discharge of the battery, ensuring its longevity.
5. Power Good Indicator: The PG pin provides an indication of the charging status, allowing for easy monitoring.
6. USB Compatibility: The DP/DM pins enable seamless integration with USB power sources.

Advantages and Disadvantages

Advantages

• Highly integrated solution for single-cell Li-Ion/Li-Po/LiFePO4 battery charging.
• Wide input voltage range allows for versatile power source compatibility.
• Small form factor package suitable for space-constrained applications.
• Multiple safety features ensure safe and reliable charging.

Disadvantages

• Limited to single-cell battery charging only.
• Not suitable for multi-cell battery systems.

Working Principles

The MCP73871-1AAI/ML operates based on a CC/CV charging algorithm. Initially, it applies a constant current to the battery until the battery voltage reaches the programmed regulation voltage. Once the regulation voltage is reached, the charger switches to a constant voltage mode, maintaining the battery voltage at the regulation level while reducing the charging current. This ensures that the battery is charged efficiently and avoids overcharging.

Application Field Plans

The MCP73871-1AAI/ML finds applications in various portable electronic devices such as smartphones, tablets, digital cameras, portable gaming consoles, and wearable devices. It is also suitable for power banks, wireless headphones, and other battery-powered consumer electronics.

Alternative Models

1. MCP73831-2ATI/OT: Similar functionality with a lower charge current range.
2. MCP73861-1AAI/ML: Supports higher charge current range and additional safety features.
3. MCP73844-420I/UN: Designed specifically for Li-Ion/Li-Po batteries with a higher regulation voltage.

These alternative models offer similar functionalities but may have different specifications and package options.