BQ24104RHLT

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Introduction

The BQ24104RHLT is a programmable integrated Li-Ion battery charge management pre-regulator developed by Texas Instruments. This pre-regulator is like a bridge between the power source and the battery. It can be used to provide precise voltage and current control for Li-Ion batteries during charging. It is ideal for applications such as portable consumer devices, medical devices and communication systems which require precise one-cell Li-Ion battery charging.

Application Fields

The BQ24104RHLT is designed for use in a variety of Li-Ion battery-powered applications, including consumer electronics such as digital cameras, hand-held devices, camcorders, and mobile phones. It is also suitable for medical devices and communication systems which require precise one-cell Li-Ion battery charging. The pre-regulator offers wide flexibility in input voltage range and charging current selection. This ensures the pre-regulator fits well in a wide variety of applications.It features programmable and protected output voltages. The output voltage can be adjusted with the help of external resistors. It also features programmable charge current levels and a programmable timer for end-of-charge detection. It has an input overvoltage detection circuit that protects the pre-regulator against accidental connection of input voltages greater than 16V. Additionally, it also features short circuit protection that halts the current flow during fault conditions.

Working Principle

The BQ24104RHLT works in two modes - prefetch mode and regulation mode. In prefetch mode the pre-regulator operates in a linear mode and produces an output voltage of approximately 4.2V. During this mode, it processes the data from the current sensor and the battery temperature sensor. The data then determines whether to transition to the regulation mode or conclude the charge cycle.In the regulation mode, the pre-regulator operates using a fixed frequency PWM algorithm to closely regulate the battery output voltage precisely. In this mode, it is able to adjust the current by updating the PWM duty cycle, thereby ensuring compliance with the battery charging parameters. It also provides protections against overvoltage and short circuits.

Conclusion

The BQ24104RHLT is an ideal pre-regulator for Li-Ion battery charging in applications that require precise voltage and current control. With its wide input voltage range and charge current selection, it provides the flexibility to match perfect design with specific applications demands. Furthermore, it features short circuit protection and input overvoltage detection to protect the pre-regulator from fault conditions. It also provides two modes of operation - prefetch mode and regulation mode - that enable the pre-regulator to maintain the desired output voltage with precision.

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