BQ77908DBT

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BQ77908DBT is a 3A, 5V synchronous buck battery charger with safety features and application flexibility that offers superior performance and system reliability for portable applications. Combining field-proven power delivery with low-cost design, the BQ77908DBT is designed to provide easy application and efficiency for systems running from portable batteries.

The BQ77908DBT belongs to the Power Management and Battery Management IC (PMIC-BMIC) category. PMIC-BMICs are integrated circuits that are used for power management and battery management. A PMIC-BMIC typically contains a DC to DC converter, a battery charger, multiple low drop out regulators, and a microcontroller to control and monitor the system.

The BQ77908DBT is designed to provide efficient, reliable and cost-effective power delivery to portable devices. It is widely used in applications such as tablets, notebooks, medical devices and wearables, among others. The BQ77908DBT is a single-chip solution that integrates the DC-DC buck converter and battery charger in a single package.

The BQ77908DBT supports simultaneous charging of Li-ion, Li-Polymer, and NiMH batteries with a single power supply. It supports charge current from 600mA to 3000mA, and can provide up to 94% efficiency with strict voltage regulation. The operating voltage range of the device is from 3.25V to 5V.

The BQ77908DBT is a powerful and intelligent battery charger with several safety features that enhance safety for the application. The device offers over-charge protection, over-discharge protection, over-current and over-temperature protection. It also features short-circuit protection, input over-voltage protection and reverse current protection.

The working principle of the BQ77908DBT is as follows. Using a single power supply, the BQ77908DBT can simultaneously charge multiple types of batteries. It uses a variable frequency variable duty cycle scheme to maintain the output voltage of the charger constant across the input voltage range. The low frequency increases the efficiency of the system and helps reduce electromagnetic interference, while the variable duty cycle ensures an accurate output voltage. The battery safety features of the BQ77908DBT ensure that the system is protected from over-current, over-temperature and other hazardous system conditions.

The BQ77908DBT is an efficient, safe and cost-effective solution for many battery powered applications. It is designed to support multiple battery chemistries and provide a high efficiency power delivery, while offering safety features for the application. This makes it an ideal choice for a wide range of portable applications that require reliable power and performance.

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