MCP73837T-FJI/UN

Product Overview

• Category: Battery Charger IC
• Use: Charging Lithium-Ion (Li-Ion) batteries
• Characteristics: High accuracy, small package size, low power consumption
• Package: SOT-23-5
• Essence: Efficient and reliable battery charging solution
• Packaging/Quantity: Tape and Reel, 3000 units per reel

Specifications

• Input Voltage Range: 4.35V to 6V
• Charge Current: Up to 1A
• Preconditioning Current: 10% of the programmed charge current
• Termination Current: 10% of the programmed charge current
• Charge Voltage: Programmable from 3.5V to 4.4V
• Charge Accuracy: ±0.5%
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The MCP73837T-FJI/UN has a total of five pins:

1. VBAT: Battery voltage input pin
2. PROG: Charge current programming pin
3. STAT: Status output pin
4. PGND: Power ground pin
5. VDD: Supply voltage input pin

Functional Features

• Constant Current/Constant Voltage (CC/CV) charging algorithm
• Automatic charge termination based on charge current
• Thermal regulation for safe operation
• Reverse battery protection
• Under-voltage lockout (UVLO) protection
• Charge status indication through the STAT pin

Advantages and Disadvantages

Advantages: - High accuracy in charging Li-Ion batteries - Small package size allows for space-saving designs - Low power consumption for energy-efficient operation - Reliable and efficient charging solution

Disadvantages: - Limited charge current capacity (up to 1A) - Requires an external resistor for charge current programming

Working Principles

The MCP73837T-FJI/UN is a battery charger IC designed for Li-Ion batteries. It utilizes a CC/CV charging algorithm, where it initially charges the battery with a constant current until the programmed charge voltage is reached. It then switches to a constant voltage mode to complete the charging process.

The IC continuously monitors the charge current and terminates the charging when the current drops below a certain threshold. It also incorporates thermal regulation to prevent overheating during operation. Additionally, it provides protection against reverse battery connection and under-voltage conditions.

Detailed Application Field Plans

The MCP73837T-FJI/UN is suitable for various applications that require the charging of Li-Ion batteries. Some potential application fields include:

1. Portable electronic devices (e.g., smartphones, tablets)
2. Wearable devices (e.g., smartwatches, fitness trackers)
3. Portable medical devices
4. Handheld gaming consoles
5. Wireless communication devices

Detailed and Complete Alternative Models

1. MCP73831T-2ACI/OT: Similar functionality with a lower charge current capacity (up to 500mA)
2. MCP73871-2CCI/ML: Higher charge current capacity (up to 2A) with additional features like USB On-The-Go (OTG) support
3. MCP73844-420I/MS: Multiple-cell battery charger IC with up to four cells in series

These alternative models provide different specifications and features to cater to specific application requirements.

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