MCP73833-NVI/UN

Product Overview

Category

The MCP73833-NVI/UN belongs to the category of battery charger ICs.

Use

This product is primarily used for charging single-cell lithium-ion (Li-Ion), lithium-polymer (Li-Po), and lithium iron phosphate (LiFePO4) batteries.

Characteristics

• The MCP73833-NVI/UN is a highly integrated solution that provides complete charge management for single-cell Li-Ion/Li-Po/LiFePO4 batteries.
• It offers a constant current/constant voltage (CC/CV) charge algorithm, ensuring efficient and safe charging.
• The device supports a wide input voltage range, making it suitable for various power sources.
• It incorporates multiple safety features such as thermal regulation, overvoltage protection, and reverse discharge protection.
• The MCP73833-NVI/UN is available in a small package, enabling compact designs.

Package

This product is available in a 10-pin MSOP (Mini Small Outline Package) package.

Essence

The essence of the MCP73833-NVI/UN lies in its ability to provide reliable and efficient charging for single-cell lithium-ion batteries, ensuring optimal performance and safety.

Packaging/Quantity

The MCP73833-NVI/UN is typically sold in reels or tubes, with a quantity of 2500 units per reel/tube.

Specifications

• Input Voltage Range: 4.5V to 6V
• Charge Current Range: 15mA to 500mA
• Preconditioning Current: 10% of the programmed fast charge current
• Charge Termination Options: C/10 or 1/10th of programmed fast charge current
• Temperature Regulation: ±1°C
• Overvoltage Protection Threshold: 4.4V
• Reverse Discharge Protection Threshold: 2.5V
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

1. VDD: Power supply input
2. STAT: Charge status output
3. PG: Power good output
4. PROG: Programming pin for setting the charge current
5. TS: Thermistor input for temperature monitoring
6. EN: Enable pin for enabling/disabling the charger
7. GND: Ground connection
8. BAT: Battery connection
9. VSS: Negative terminal of the sense resistor
10. VREF: Reference voltage output

Functional Features

• Constant current/constant voltage (CC/CV) charging algorithm
• Automatic charge termination based on user-programmable options
• Thermal regulation to prevent overheating during charging
• Safety features such as overvoltage protection and reverse discharge protection
• Power good output indicating the presence of a valid input power source
• Charge status output indicating the charging state

Advantages and Disadvantages

Advantages

• Highly integrated solution for single-cell Li-Ion/Li-Po/LiFePO4 battery charging
• Wide input voltage range allows flexibility in power source selection
• Small package size enables compact designs
• Multiple safety features ensure safe charging
• Efficient CC/CV charging algorithm for optimal battery performance

Disadvantages

• Limited to single-cell battery charging only
• Requires external components such as sense resistor and thermistor for proper operation

Working Principles

The MCP73833-NVI/UN follows a constant current/constant voltage (CC/CV) charging algorithm. Initially, it applies a constant current to the battery until the programmed fast charge current is reached. Once the battery voltage reaches the programmed float voltage, the charger switches to a constant voltage mode. The charge current gradually decreases as the battery approaches full capacity.

The device continuously monitors the battery temperature using an external thermistor connected to the TS pin. It regulates the charging current based on the temperature to prevent overheating and ensure safe operation.

Detailed Application Field Plans

The MCP73833-NVI/UN is widely used in portable electronic devices such as smartphones, tablets, digital cameras, and portable media players. It is also employed in various battery-powered applications like wireless communication devices, handheld gaming consoles, and wearable devices.

Detailed and Complete Alternative Models

• MCP73831: Similar functionality but with a lower charge current range (15mA to 200mA)
• MCP73837: Higher charge current range (15mA to 1000mA) for faster charging
• MCP73844: Supports dual-cell Li-Ion/Li-Po battery charging

These alternative models offer different charge current ranges and may have additional features depending on the specific requirements of the application.

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