MCP73811T-420I/OT

Product Overview

Category

The MCP73811T-420I/OT belongs to the category of battery charger ICs.

Use

This product is primarily used for charging single-cell lithium-ion (Li-Ion) or lithium-polymer (Li-Po) batteries.

Characteristics

• The MCP73811T-420I/OT is a highly integrated linear charge management controller.
• It provides a complete charging solution for portable devices.
• This IC offers various safety features, such as thermal regulation and overvoltage protection.
• It supports a wide input voltage range, making it suitable for different power sources.
• The MCP73811T-420I/OT has a programmable charge current up to 500 mA.

Package

This product is available in a small SOT-23-5 package.

Essence

The essence of the MCP73811T-420I/OT lies in its ability to efficiently and safely charge Li-Ion or Li-Po batteries.

Packaging/Quantity

The MCP73811T-420I/OT is typically sold in reels, with 3000 units per reel.

Specifications

• Input Voltage Range: 4.5V to 6.0V
• Charge Current Range: Up to 500 mA
• Programmable Charge Termination Current: 1/10th of the programmed charge current
• Preconditioning Mode: Constant current with a reduced charge current
• Safety Features: Thermal Regulation, Overvoltage Protection, Reverse Discharge Protection

Detailed Pin Configuration

The MCP73811T-420I/OT has the following pin configuration:

1. VBAT - Battery Voltage Input
2. PROG - Charge Current Programming Pin
3. STAT - Status Output Pin
4. GND - Ground
5. VDD - Supply Voltage Input

Functional Features

• Constant Current/Constant Voltage (CC/CV) charging algorithm
• Automatic charge termination based on programmable charge current
• Preconditioning mode for deeply discharged batteries
• Charge status indication through the STAT pin
• Thermal regulation to prevent overheating
• Reverse discharge protection to avoid battery drain

Advantages and Disadvantages

Advantages

• Highly integrated solution for battery charging applications
• Wide input voltage range allows compatibility with various power sources
• Programmable charge current provides flexibility for different battery capacities
• Safety features ensure reliable and protected charging process

Disadvantages

• Limited maximum charge current of 500 mA may not be suitable for high-capacity batteries
• Linear charging method may result in lower charging efficiency compared to switching chargers

Working Principles

The MCP73811T-420I/OT operates based on a CC/CV charging algorithm. It starts by providing a constant current to the battery until the programmed charge current is reached. Once the battery voltage reaches a predetermined threshold, the charger switches to a constant voltage mode. The charge current gradually reduces until it reaches the programmed charge termination current, at which point the charging process is completed.

Detailed Application Field Plans

The MCP73811T-420I/OT is commonly used in various portable electronic devices, including:

1. Smartphones and tablets
2. Portable media players
3. Bluetooth headsets
4. Wearable devices
5. GPS navigation systems

Detailed and Complete Alternative Models

1. MCP73812-420I/OT: Similar to MCP73811T-420I/OT but with an additional power good output pin.
2. MCP73821T-420I/OT: Dual-cell battery charger IC with similar features as MCP73811T-420I/OT.
3. MCP73831T-420I/OT: Single-cell battery charger IC with lower charge current capability.

These alternative models offer similar functionality and can be considered as substitutes for the MCP73811T-420I/OT in different applications.

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