LT8490IUKJ#TRPBF

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Power-management integrated circuits (PMICs) are dedicated integrated circuits to manage, power, and maintain a device’s power supply; battery chargers are one of the most important and popular functions of a PMIC. The LT8490IUKJ#TRPBF (henceforth LT8490) is a popular PMIC with an extensive battery charger application field.The LT8490 is an Avionics-Grade Battery Charger designed to charge a variety of battery chemistries, including LiFePO4, Li-ion, Li-Polymer, and NiMH. It has a wide input voltage range (3 V to 36 V) and output current up to 8 A. The LT8490 is capable of charging up to 18 cells in series, with a programmable constant current/constant voltage (CC/CV) trickle and main charge operation. It also has a number of additional features, such as over-voltage protection, over-temperature protection, short-circuit protection, and more. The working principle of the LT8490 is based on a synchronous buck regulator. It uses input and output MOSFETs to regulate the output voltage and current. The output voltage can be programmed from 0.6 V to 20 V, with an accuracy of 0.1%. The output current can be set from 0 A to 8 A, with an accuracy of 0.5%.The LT8490 uses a two-stage charging cycle to charge batteries. In the first stage, it acts in a constant current (CC) mode, wherein it supplies the battery with a constant current. This stage is used for “bulk” charging of the battery, to bring the voltage up to a certain level. In the second stage, it acts in a constant voltage (CV) mode, wherein it supplies the battery with a constant voltage. This stage is used for topping up the battery, and bringing its voltage to full charge.The LT8490 also features a number of safety features. To ensure safe charging, it monitors the battery voltage and temperature and Automatic Charge Termination (ACT). In addition to this, its MOSFETs are designed to protect against current overshoots and reversed input polarity. Finally, it has an input over-voltage protection (OVP) to prevent overcharging.In summary, the LT8490 is a popular and versatile battery charger that is suitable for a wide variety of battery chemistries and applications. Its wide input voltages and output current, along with its two-stage charging cycle and additional safety features, make it an effective and reliable device. Additionally, its synchronous buck regulator design ensures excellent voltage and current accuracy. It is thus a perfect choice for applications that require safe and reliable charging of batteries.

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