BQ24259RGER

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The BQ24259RGER is an integrated circuit containing multiple switching regulators, current limited switches, and analog monitors. It is categorized as a Power Management Integrated Circuit (PMIC) and used for Battery Charging applications. The chip is capable of both charging single or multiple cell Lithium Ion (Li-Ion) or Lithium-polymer (Li-Po) batteries with up to 4.2V charging voltage. It features Power-Path Management to allow simultaneous charging and system operation, fast charging with optimal thermal performance, and configurable safety timer timeout. The device also includes an analog monitor with a wide input voltage range, several charging parameters, and adjustable thresholds. This article will discuss the application fields and working principle of the BQ24259RGER.

The BQ24259RGER is primarily used in mobile phones and portable devices such as digital cameras, MP3 players and PDAs. It can be implemented in AC adapters, USB sources, solar battery chargers and fuel cell systems. This power management IC can be used for battery charging current up to 3A with programmable end of charge voltage, current and timer. The device incorporates multiple protection features such as short circuit current limiting, thermal shutdown, and overvoltage protection.

The basic working principle of the BQ24259RGER starts when the power supply voltage is applied. The inductor current, output voltage and other parameters are monitored by the chip and the system will then enter normal operation mode when the conditions are satisfied. In this mode, a switching regulator adjusts its duty cycle to generate the required voltage across the battery. The battery is then charged using a constant current until it reaches the programmed end of charge current and voltage. The charger will then enter trickle charging where the load current is reduced significantly to maintain the battery voltage.

The BQ24259RGER offers many features such as, programmable current limit with reversible current sensing and hiccup mode, reduced charge ripple current with programmable soft-start, low operating current and many more. In addition, the device has selectable power saving mode, programmable charge voltage and charge completion detection. With all these features, the BQ24259RGER can provide precise and efficient charging solutions for battery powered devices.

In conclusion, the BQ24259RGER integrated circuit is an important component for battery charging applications. It can be used for charge controllers, power supplies of mobile phones and other portable devices. The device offers a wide range of features, programmable safety features, low power and high efficiency. As such, it has been proven to be an effective solution for battery charging.

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