MCP73832T-4ADI/OT

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PMIC - Battery Chargers

A PMIC (Power Management Integrated Circuit) Battery Charger is a device specifically developed to charge a battery. It is an integrated circuit (IC) chip that includes power management and battery management, thus allowing the battery to be safely charged when connected to the power source. One example of a PMIC Battery Charger is the MCP73832T-4ADI/OT.

The MCP73832T-4ADI/OT is a fully integrated standalone linear Li-Ion and Li-Polymer battery charger. It is well suited for low cost, space constrained portable applications such as digital still cameras, cell phones, handheld PCs and other mobile devices. The chip consists of a high accuracy current sense circuit, 3.2V reference voltage, thermal monitor, current selector, and thermistor input for temperature measurement. It can be integrated into the system by default or programmed via a serial interface.

Applications

The MCP73832T-4ADI/OT is well suited for a variety of applications. It is suitable for charging single cell Li-Ion/Li-Polymer batteries with a charge current up to 1 Amp. It is also suitable for charging several cell batteries in parallel and synchronous battery charging to accomplish optimized energy management. It is suitable for key-on-to-off type mode and constant current/constant voltage linear charging mode. The charger can also be configured for both constant current or constant voltage to prevent battery abuse.

This battery charger has an extensive range of applications including cell phones, digital still cameras, notebooks, portable video players, walkie talkies, PDAs, portable electronic devices, MP3 players, CB radios, portable medical equipment, and more.

Working Principle

The MCP73832T-4ADI/OT follows a three-stage charging process to ensure the safety of the battery and prevent damage. The first stage is the pre-charge stage, which starts when the power is connected to the battery. During this stage, the charger limits the current to an adjustable value. The second stage is the constant current stage, which begins when the battery voltage reaches the upper regulation voltage. During this stage, the charger applies a constant current to the battery to charge it rapidly. The third and final stage is the constant voltage stage, which begins when the battery has reached the upper regulation voltage. During this stage, the charger adjusts the current through the battery in order to maintain the upper regulation voltage. This stage finishes when the current drops to an adjustable value.

The MCP73832T-4ADI/OT also includes several safety features. These include overcharge protection, thermal protection, and failure detection. The overcharge protection ensures that the battery isn’t charged beyond its recommended level, while the thermal protection ensures that the charger doesn’t get too hot during operation. The failure detection feature monitors the charge current and alerts the system if the charger fails.

Conclusion

The MCP73832T-4ADI/OT is a PMIC Battery Charger specifically designed for low cost, space constrained portable applications. It is well suited for charging single cell Li-Ion/Li-Polymer batteries with a charge current up to 1 Amp and for charging several cell batteries in parallel. Additionally, it includes several safety features such as overcharge and thermal protection, as well as failure detection. The device is suitable for a variety of applications, including cell phones, digital still cameras, portable video players and other mobile devices, making it a great choice for the battery charging needs of many portable electronic devices.

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