MCP73812T-420I/OT

Product Overview

Category

The MCP73812T-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

• 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 MCP73812T-420I/OT is available in a 10-pin, thermally enhanced Thin Shrink Small Outline Package (TSOT).

Essence

The essence of the MCP73812T-420I/OT lies in its ability to efficiently and safely charge Li-Ion or Li-Po batteries with minimal external components.

Packaging/Quantity

This product is typically packaged in reels and comes in quantities of 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 of the programmed fast charge current
• Preconditioning Threshold Voltage: 2.9V
• Automatic Recharge Threshold Voltage: 3.0V
• Temperature Monitoring Range: -40°C to +85°C
• Package Type: TSOT-23-10

Detailed Pin Configuration

The MCP73812T-420I/OT 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. VSS: Ground
7. VDD: Supply voltage input
8. CE: Charge enable input
9. DP: D+ USB data line
10. DM: D- USB data line

Functional Features

1. Programmable charge current allows flexibility in charging different battery capacities.
2. Preconditioning feature ensures safe charging of deeply discharged batteries.
3. Automatic recharge feature initiates charging when the battery voltage drops below a certain threshold.
4. Temperature monitoring and protection prevent overheating during charging.
5. Power good output indicates the status of the charging process.
6. Small package size and low external component count make it suitable for space-constrained applications.

Advantages and Disadvantages

Advantages

• Wide input voltage range allows compatibility with various power sources.
• Programmable charge termination current enhances battery safety.
• Preconditioning feature extends battery life by ensuring proper charging of deeply discharged cells.
• Automatic recharge feature eliminates the need for manual intervention.
• Temperature monitoring and protection prevent damage to the battery and surrounding components.
• Small package size saves board space in compact designs.

Disadvantages

• Limited maximum charge current may not be suitable for high-capacity batteries.
• Lack of advanced charging algorithms may limit optimization for specific battery chemistries.

Working Principles

The MCP73812T-420I/OT operates based on a constant current/constant voltage (CC/CV) charging algorithm. It starts with a preconditioning phase, where a low current is applied to deeply discharged batteries. Then, it transitions to the constant current phase until the battery voltage reaches a predetermined level. Finally, it switches to the constant voltage phase, maintaining a steady voltage while reducing the charging current until the charge current falls below the programmed termination current.

Detailed Application Field Plans

The MCP73812T-420I/OT is widely used in portable electronic devices, such as smartphones, tablets, digital cameras, and portable media players. It is also suitable for applications where single-cell Li-Ion or Li-Po batteries need to be charged efficiently and safely.

Detailed and Complete Alternative Models

1. MCP73811T-420I/OT: Similar to the MCP73812T-420I/OT but with a lower charge current capability of up to 200mA.
2. MCP73813T-420I/OT: Similar to the MCP73812T-420I/OT but with a higher charge current capability of up to 1000mA.
3. MCP73814T-420I/OT: Similar to the MCP73812T-420I/OT but with additional features like battery temperature monitoring and thermal regulation.

These alternative models provide options based on specific charging requirements and additional functionalities needed in various applications.

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