BQ24003PWP

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The BQ24003PWP (hereinafter referred to as the device) is a single-cell Li-ion/Li-Polymer battery charger and power path management integrated circuit. It is mainly used in portable electronic devices, such as digital cameras, Bluetooth devices, mobile phones and laptop computers. This device can provide up to 1.2 A typical current with an accuracy of ± 4%. It is designed to detect battery presence, operates in both constant current/constant voltage modes and automatically switches to trickle-charging when the charging current falls below 5 mA.

The device belongs to the PMIC (Power Management Integrated Circuit) family which is responsible for the efficient conversion and regulation of power—both supplied and output—on the board level. PMICs ultimately regulate the power consumption within the device and can be used to control various elements, such as chargers, battery management, system monitoring and power management.

In this regard, from a battery charger point of view, the device is focused on providing efficient charging capabilities for Li-ion/Li-Polymer batteries. It can provide both constant current and constant voltage charging modes by using a digital control loop to regulate the current and voltage respectively.

To this end, the device operates in two distinct modes: Fast Charge and Regulation. In Fast Charge mode, the device slowly ramps up the voltage until it reaches a certain threshold, at which point it switches to Regulation mode. In Regulation mode, the current is monitored and the appropriate output voltage is adjusted to ensure that the battery is being charged at the optimal rate.

Furthermore, the device features over-voltage, under-voltage, and over-temperature protection to ensure the battery and device are being safely charged. In addition, it includes a thermal monitoring feature which can detect if the battery is getting too hot, and it can shut down the charging process if needed. This helps to extend the battery\'s lifetime and ensures a safer charging experience.

The device\'s safety and performance standard is maintained by constant monitoring and adjusting the output current and voltage for optimum charging. Additionally, input voltage regulation steps in whenever the voltage drops below the lower limit or rises above the upper limit. The device\'s on-chip logic can self adjust the PWM frequency to prevent unwanted transients, as well as reduce the ripple in the output current and voltage.

The BQ24003PWP device is designed to support both SEPIC (Single Ended Primary Inductance Converter) and buck-boost topologies. With a SEPIC, energy from the input is stored in an inductor before it is transferred to the battery. In buck-boost mode, the input and output voltages can be as low as 2.4 and as high as 5.5 V respectively. This makes the device ideal for applications that require a wide input-voltage range.

Finally, the device\'s high-efficiency and small size offer significant benefits over larger, stand-alone solutions. This device is designed to preset the parameters, allowing it to be integrated quickly into any system. Consequently, it is capable of reducing the number of components in the system and providing a cost-effective solution.

In summary, the BQ24003PWP is a single-cell Li-ion/Li-Polymer battery charger and power-management integrated circuit, suitable for use in a wide variety of portable electronic devices. It offers efficient charging capabilities with both constant-current, constant-voltage, and PWM frequency regulation. Moreover, it includes an on-chip over-temperature, over-voltage, and under-voltage protection, as well as input voltage-regulation steps, with the ability to support both SEPIC and buck-boost topologies. With its wide input-voltage range and small size, it is ideal for a variety of applications.

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