BQ24745RHDTG4

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The BQ24745RHDTG4 is classified under battery chargers from power management integrated circuits (PMICs). This device is used to manage the charging of a series of batteries of different types, commonly Li-ion, LiFePO4, and NiMH. With a selected VBUS/VCC input and charger profile, the BQ24745RHDTG4 can devise charge current values from a few tens of milli-amperes (mA) to a maximum of 11A. It can also detect individual cell voltages and currents for particular battery stacks. Furthermore, depending on the application, it can enable a low power draw feature to preserve battery life and optimize system performance.

The BQ24745RHDTG4 comes with an integrated battery/system monitor, complete with a 12-bit parallel A/D converter. This allows it to detect faults while accurately measuring the VBUS/VCC, VBAT, ICHG, and system input current values. Additionally, the device has temperature sensing and protection that guards both the battery and the connected system. To prevent overcharging, the device has both safety timers and charge termination compared to other stand alone charger ICs.

The BQ24745RHDTG4 also employs a smart charge algorithm for Li-ion and LiFePO4 batteries. This sophisticated profile reduces the complexity of programming a safe charging scheme. By default, when the battery is connected, the IC will start charging with a limited current. When it identifies the battery type and voltage, these limits are adjusted as to not cause any damage to the battery cells. Additionally, the maximum system power available can be set through the use of a battery profile, allowing it to be adjusted according to the needs of the user.

Ultra-low power leakage is another key feature of the BQ24745RHDTG4. When in sleep mode, the device can draw as low as 0.2µA and a maximum current of 20µA in active mode. This allows the device to preserve battery charge, making it suitable for many applications like portable medical devices or wearable devices. Furthermore, it can support up to four different power profiles, making it a better choice for designs requiring dynamic power management capabilities.

The BQ24745RHDTG4 is a highly efficient and versatile charger IC for many different battery applications. With its low power draw, accurate monitoring, and smart charge algorithm capabilities, it ensures safety and makes the design process easier, making it an ideal choice for battery powered systems.

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