Description:The ISL6251, ISL6251A is a highly integrated battery charger controller for Li-Ion/Li-Ion polymer batteries and NiMH batteries. High efficiency is achieved by a synchronous buck topology and the use of a MOSFET, instead of a diode, for selecting power from the adapter or battery. The low side MOSFET emulates a diode at light loads to improve the light load efficiency and prevent system bus boosting. The constant output voltage can be selected for 2, 3 and 4 series Li-Ion cells with 0. 5% accuracy over-tempe
The recommended layout for the ISL6251AHAZ involves placing the input capacitors close to the VIN pin, using a solid ground plane, and keeping the high-current paths short and wide. Additionally, it is recommended to place the output capacitors close to the VOUT pin and to use a separate ground plane for the output stage.
To select the right inductor for the ISL6251AHAZ, consider the maximum current rating, inductance value, and DC resistance. The inductor should be able to handle the maximum output current and have a low DC resistance to minimize power loss. A good starting point is to use an inductor with an inductance value between 1uH to 10uH and a current rating of at least 2A.
The maximum junction temperature for the ISL6251AHAZ is 125°C. It is recommended to keep the junction temperature below 100°C for optimal performance and reliability.
The ISL6251AHAZ has a built-in OVP feature that can be enabled by connecting the OVP pin to a voltage divider network. The OVP threshold can be set by adjusting the voltage divider ratio. When the output voltage exceeds the OVP threshold, the device will shut down to protect the load.
Yes, the ISL6251AHAZ is rated for operation up to 105°C ambient temperature. However, it is recommended to derate the output current and to ensure good thermal design to keep the junction temperature below 100°C for optimal performance and reliability.
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ISL6251AHAZ Overview
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