MCP73833-BZI/UN

Product Overview

• Category: Battery Charger IC
• Use: Charging Lithium-Ion (Li-Ion) batteries
• Characteristics: Small form factor, high efficiency, and advanced charging algorithms
• Package: SOT-23-5
• Essence: Integrated circuit for managing the charging process of Li-Ion batteries
• Packaging/Quantity: Tape and Reel, 3000 units per reel

Specifications

• Input Voltage Range: 4.5V to 6.0V
• Charge Current Range: 15mA to 500mA
• Preconditioning Current: 10% of programmed current
• Charge Termination: Programmable timer or voltage-based
• Charge Voltage Accuracy: ±1%
• Temperature Regulation: ±1°C
• Reverse Discharge Protection: Yes
• Thermal Shutdown: Yes
• Under Voltage Lockout: Yes

Pin Configuration

The MCP73833-BZI/UN has a total of five pins:

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

Functional Features

• Constant-Current/Constant-Voltage (CC/CV) charging algorithm
• Programmable charge current through the PROG pin
• Charge status indication through the STAT pin
• Automatic recharge when battery voltage drops below a certain threshold
• Reverse discharge protection prevents current flow from the battery to the charger
• Thermal shutdown and under-voltage lockout for safety

Advantages and Disadvantages

Advantages

• Small package size allows for space-constrained applications
• High charge voltage accuracy ensures optimal battery performance
• Programmable charge current enables flexibility in charging different battery capacities
• Reverse discharge protection prevents damage to the charger and battery

Disadvantages

• Limited input voltage range may not be suitable for all applications
• Lack of built-in battery protection features, such as overcharge or over-discharge protection

Working Principles

The MCP73833-BZI/UN is a linear charge management controller IC designed for single-cell Li-Ion batteries. It follows a CC/CV charging algorithm, where it initially charges the battery with a constant current until a certain voltage threshold is reached. Then, it switches to a constant voltage mode to complete the charging process.

The charge current can be programmed using an external resistor connected to the PROG pin. The STAT pin provides information about the charging status, indicating whether the battery is charging, fully charged, or in a fault condition.

The MCP73833-BZI/UN also includes safety features like reverse discharge protection, thermal shutdown, and under-voltage lockout to ensure safe and reliable operation.

Detailed Application Field Plans

The MCP73833-BZI/UN is commonly used in various portable electronic devices that require Li-Ion battery charging. Some typical application fields include:

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

Detailed and Complete Alternative Models

• MCP73831: Similar functionality but with a lower charge current range (up to 200mA)
• MCP73837: Higher charge current range (up to 1A) for faster charging
• MCP73871: Integrated battery protection features for added safety

These alternative models provide options based on specific requirements, such as charge current capability and additional protection features.

In conclusion, the MCP73833-BZI/UN is a compact and efficient battery charger IC designed for Li-Ion batteries. Its programmable charge current, safety features, and compatibility with various portable devices make it a popular choice in the industry.

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