BQ24038RHLT

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The BQ24038RHLT is an integrated circuit component that is part of a category of electronics known as Power Management Integrated Circuits (PMICs). More specifically, this component is part of a range of PMICs that form the Charge Management Unit (CMU) in an AC/DC power converter. The BQ24038RHLT is specifically designed to provide both a charging function as well as thermal protection for Lithium-Ion (Li-Ion) battery packs.

The BQ24038RHLT is used in a broad range of applications, primarily as a battery charger for consumer electronics, medical, and industrial equipment such as power tools and medical devices. The IC’s high charge current, low dropout voltage, and low voltage start-up make it an ideal solution for charging Li-Ion battery packs in a wide range of applications, from consumer electronics for portable devices to industrial and medical equipment.

The BQ24038RHLT is designed with a wide range of features to simplify the design and implementation of Li-Ion charging solutions. Its benefits include:

• Integrated DC/DC buck converter with low dropout voltage
• Discharge switch prevents the battery from discharging while charging
• Single input supply operating from 4.5V to 5.5V
• Supports 3-cell Li-Ion battery packs of up to 11.1V
• Internal current limit setting with external resistor
• Automatic recharge function when the battery voltage drops below voltage threshold
• Programmable charge current up to 8A peak
• Charge termination based on voltage and/or current threshold
• Thermal protection circuit with NTC or external temperature monitoring

At the heart of the BQ24038RHLT is a DC/DC buck converter with a low dropout voltage, allowing it to operate with high efficiency even when the battery’s voltage is close to the maximum charging voltage. The IC also has an internal discharge switch, which allows it to safely discharge the battery during charging, for example when the battery voltage falls below a certain voltage threshold. The IC can be configured to support 3-cell Li-Ion battery packs of up to 11.1V, and is capable of supporting peak charge currents of up to 8A.

The BQ24038RHLT also includes a programmable current limit setting, allowing the design engineer to configure the maximum charge current in order to achieve the desired charging profile. This current limit can be set with an external resistor, allowing the designer to configure it in a wide range of applications. Furthermore, the IC includes an automatic recharge function, which kicks in when the battery voltage falls below a certain voltage threshold.

Additionally, the BQ24038RHLT incorporates a thermal protection circuit, which is designed to prevent the IC from operating outside of its specified operating temperature range. The thermal protection circuit can be configured to monitor either the temperature of the battery pack via a thermistor, or the temperature of the IC itself. This ensures that the IC will not overheat, even during periods of high charge current.

Overall, the BQ24038RHLT is an excellent choice for a battery charger for a broad range of applications, from consumer electronics to industrial and medical battery packs. Its wide range of features, including a low dropout voltage, current limit setting, automatic recharge function, and thermal protection circuit, make it an ideal solution for Li-Ion charging.

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