BQ24004PWPG4

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PMIC - Battery Chargers: BQ24004PWPG4 Application Field and Working Principle

BQ24004PWPG4 is a highly integrated power management IC designed for high efficiency, space-limited rechargeable battery applications. Originally developed for the booming mobile device market, the chip is now utilized in various batteries. This article will explain the application field and working principle of BQ24004PWPG4.

Application Field

BQ24004PWPG4 is an ideal chip for high efficiency, space-limited rechargeable battery applications. It has features such as fast charge, automatic charge current control and reverse boost for quick and efficient high voltage charging of Li-Ion batteries. The chip supports low power charging of small NiMH cells, CID and high voltage charging of lithium-ion batteries. It also has advanced safety features such as overheat protection and charge enable control.

The chip can be used in most Li-ion charging applications such as medical instruments, cordless power tools, machine-to-machine (M2M) devices, and remote control systems. The chip also has applications in white goods such as LCD TV’s and home appliances, portable electronic and handheld devices, notebook and tablet PCs, and also for automotive applications.

Working Principle

BQ24004PWPG4 is a flyback switching regulator. The flyback topology is designed such that power is transferred by the magnetic coupling between the primary and secondary of the transformer when the coil is energized. The switching action of the power devices generates a voltage that is not limited by the input or output voltage.

The chip uses a switch-mode scheme to control the incoming power to the battery. The principle of controlling the incoming power is simple: a reference voltage is provided, and then the chip compares the input voltage to the desired output voltage to determine whether the switch should be on or off. When the switch is on, current flows through the circuit, and when the switch is off, no current flows.

Additionally, BQ24004PWPG4 has an internal reverse boost circuit with a power factor correction feature, allowing for fast and efficient charging of Li-ion batteries. The chip also features automatic charge current control, allowing for users to adjust the charge current according to their desired capacity.

The chip also includes a built-in over temperature protection circuit which reduces the power my device requires when it is deployed in a high temperature environment. It also provides discharge enable control feature to extend the life span of the battery, and a low quiescent current that improves current efficiency.

The chip also supports charging of both single and dual cell Li-ion batteries, allowing for fast and efficient charging of high capacity battery packs.

In conclusion, BQ24004PWPG4 is an optimal choice for high efficiency, space-limited rechargeable battery applications. The chip provides advanced features to ensure fast and efficient charging of batteries, over temperature protection, charge enable control and low quiescent current capabilities. It has applications in various fields such as medical instruments, cordless power tools, white goods, handheld devices, notebook and tablet PCs, and also for automotive applications.

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