BQ24003PWPR

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The BQ24003PWPR is an advanced stand-alone linear charger IC specifically designed to charge 3.7V Li-ion batteries from AC adapters, USB ports and data lines. The device includes all the necessary power conversion, safety and control components for a complete single-cell Li-ion or Li-Pol charging solution. This stand-alone linear charger is available in 3.3V or 5V input versions and operates at a maximum of 0.7A for the 3.3V version and 1.2A for the 5V version.

The BQ24003PWPR is capable of auto-sensing either a USB or AC adapter, and can operate from the lowest amount of power input necessary. It’s also equipped with an array of safety features, such as over-temp shutdown, overcharge protection and a built-in thermal feedback loop. Additionally, the IC features a current setting pin accessible via a 4-bit switch, which allows for adjustable current limitation. It also incorporates a switcher frequency setting for noise reduction and a charge timer for charge termination.

BQ24003PWPR Applications:

• Smartphones
• Tablets
• MP3 players
• Digital cameras
• Notebook PCs

BQ24003PWPR Working Principle:

The BQ24003PWPR utilizes a buck topology to design a low-cost, low-noise, fast-charging solution for single-cell Li-ion/Li-Pol batteries. The IC integrates a P-channel MOSFET and a synchronous rectifier, as well as logic control and power MOSFET drivers, to provide a high level of efficiency and power density. A buck-boost converter is used to provide a steady voltage across the battery stack against AC adapter voltage variation. An adjustable voltage reference reduces the battery voltage from 4.2V to the specified maximum charging voltage set by the user. The internal power switches comprise an N-channel pass device and an N-channel synchronous rectifier, controlled by the IC for the proper operation of the buck converter.

The BQ24003PWPR features a low voltage monitor and a current monitor. The low voltage monitor is used to monitor the battery voltage when charging. When the battery voltage drops to a predetermined level, the IC will terminate the charging cycle. The current monitor is used to measure the current flowing through the battery and allows the IC to limit the maximum charging current to protect the cell and prevent over current conditions. The device will also read the thermal signal from the battery and shut down the charging cycle when the cell temperature exceeds the recommended safe operating temperature.

In summary, the BQ24003PWPR is a powerful and versatile charging IC for portable devices that allows designers to charge Li-ion/Li-Pol batteries from a variety of sources. Its array of safety features and adjustable parameters makes it a great choice for both novice and experienced design engineers.

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