ISL9520HRTZ

The purpose of the ISL9520 device described in the document is to serve as a highly integrated Narrow VDC system voltage regulator and battery charger controller. It is designed for applications where the system power source can be either the battery pack or the output of the regulator/charger. The device ensures that the maximum voltage to the system is equal to the maximum battery voltage instead of the maximum adapter voltage. Additionally, it includes a patented system to control trickle charging deeply discharged batteries while maintaining the system voltage at a user-defined minimum. The ISL9520 achieves high efficiency with a DC/DC synchronous-rectifier buck converter, equipped with diode emulation and variable switching frequency for enhanced light load efficiency and AC-adapter boosting prevention. It can charge two, three, or four series connected Lithium-ion cells at up to 8A charge current. The device also provides various outputs to indicate the presence of the AC-adapter, battery discharge current, and adapter current.

The ISL9520 device mentioned in the document is used in applications such as Ultrabooks, notebook computers, tablet PCs, and portable equipment with rechargeable batteries.

The system voltage accuracy of the ISL9520 device is specified as ±0.5% (-10°C to +100°C) .