MCP73843-420I/MS

Product Overview

Category

The MCP73843-420I/MS 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

• Input voltage range: 4.5V to 6.0V
• Charge current: Up to 500mA
• Programmable charge termination current
• Preconditioning of deeply discharged cells
• Automatic recharge
• Temperature monitoring and protection
• Small package size
• Low external component count

Package

The MCP73843-420I/MS is available in a small MSOP-10 package.

Essence

The essence of this product lies in its ability to efficiently and safely charge Li-Ion or Li-Po batteries with various features and protections.

Packaging/Quantity

The MCP73843-420I/MS is typically packaged in reels, with 3,000 units per reel.

Specifications

• Input Voltage Range: 4.5V to 6.0V
• Charge Current: Up to 500mA
• Programmable Charge Termination Current: 1/10th, 1/20th, or 1/40th of the programmed fast charge current
• Preconditioning: 10% of the programmed fast charge current
• Automatic Recharge: Yes
• Temperature Monitoring: Yes
• Thermal Regulation: Yes
• Reverse Discharge Protection: Yes
• Battery Status Output: Yes
• Package Type: MSOP-10

Detailed Pin Configuration

The MCP73843-420I/MS has the following pin configuration:

1. VBAT - Battery Voltage Input
2. PROG - Charge Current Programming Pin
3. STAT - Battery Status Output
4. TS - Temperature Sense Input
5. VSS - Ground
6. PGND - Power Ground
7. CE - Charge Enable Input
8. STAT2 - Battery Status Output
9. VDD - Supply Voltage Input
10. VOUT - Regulated Output Voltage

Functional Features

1. Programmable charge current allows flexibility in charging different battery capacities.
2. Preconditioning feature ensures safe charging of deeply discharged cells.
3. Automatic recharge feature enables the charger to restart charging if the battery voltage drops below a certain threshold.
4. Temperature monitoring and protection prevent overheating and damage to the battery.
5. Reverse discharge protection prevents the battery from discharging back into the charger.
6. Battery status outputs provide information about the charging process.

Advantages and Disadvantages

Advantages

• Wide input voltage range allows compatibility with various power sources.
• Programmable charge termination current enhances flexibility in charging different batteries.
• Small package size saves board space.
• Low external component count simplifies the design.

Disadvantages

• Limited maximum charge current may not be suitable for high-capacity batteries.
• Lack of advanced charging algorithms for optimal battery performance.

Working Principles

The MCP73843-420I/MS operates by regulating the charging current and voltage to the connected Li-Ion or Li-Po battery. It uses a constant current/constant voltage (CC/CV) charging profile, where it initially charges the battery with a constant current until a certain voltage is reached. Then, it switches to a constant voltage mode to maintain the battery voltage while reducing the charging current. The charger continuously monitors the battery temperature and adjusts the charging parameters accordingly to ensure safe and efficient charging.

Detailed Application Field Plans

The MCP73843-420I/MS is widely used in portable electronic devices such as smartphones, tablets, digital cameras, and portable gaming consoles. It is also utilized in various battery-powered applications, including medical devices, wireless sensors, and handheld instruments.

Detailed and Complete Alternative Models

1. MCP73831-2ATI/OT: Similar features with a lower charge current capability.
2. MCP73871-2CCI/ML: Higher charge current capability with additional advanced charging algorithms.
3. MCP73861-2CCI/ML: Enhanced thermal regulation and protection features.

These alternative models provide options for different charging requirements and offer additional features for specific applications.

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