ISL6251AHRZ-T

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The ISL6251AHRZ-T (herein referred to as the ISL6251) is a Powerex integrated battery charger IC designed to charge a wide range of rechargeable Li-Ion battery packs. It is designed to be compliant with USB-C Connector and Power Delivery (PD) specifications, and provides a solution for low power adapters. This device supports a wide range of USB-C PD profiles and can be configured to meet the highest level of charging requirements. Additionally, it supports other applicable charging profiles such as QC3/4, Wireless Charging (WPC/PMA), and proprietary profiles.

The ISL6251 is a highly efficient and cost-effective solution for charging Li-Ion battery packs and is suitable for a wide range of applications, including mobile phones, tablets, laptop PCs, digital cameras, MP3 players, and other handheld mobile devices. The ISL6251 contains a buck-boost charge controller, power MOSFETs, boost diode and an I2C/SMBus interface. It also includes a cell balancing circuit which can balance cells to within 0.1V when battery packs are charged with up to four cells and provides less than 0.2V overshoot.

The key features of the ISL6251 include an adjustable output voltage range up to 20V, charging current up to 10A, constant power output, and protection functions such as overvoltage protection and overcurrent protection. Additionally, it includes LED indicators for status monitoring and fault LEDs for fault indications. The ISL6251 is compliant with RoHS, REACH, and Japan Green procurement.

The ISL6251 features a very high efficiency switching regulator that operates on a low frequency which eliminates audio noise generated by fast switching, making it very suitable for portable applications. The output voltage and current are settable via an external I2C or SMBus interface. The ISL6251 also includes a thermal foldback circuit which reduces power dissipation to maintain temperature stability. Combined, these features make the ISL6251 one of the most efficient and reliable battery charging solutions available.

The ISL6251 works by buck-boost converting from the input voltage and current to the output voltage and current. The output voltage is monitored for voltage drops, and the input voltage is monitored for overvoltages. If the voltage drops or overvoltages are detected, the buck-boost control loop will adjust the output voltage to ensure that the optimal voltage is achieved. Additionally, the ISL6251 includes a logic block that controls the other components of the device and provides overcurrent protection and thermal monitoring.

The ISL6251 is an ideal solution for applications requiring the highest levels of safety and efficiency when charging Li-Ion battery packs. With its wide range of features and low power dissipation, the ISL6251 provides a cost-effective and reliable solution for powering up handheld mobile devices and other mobile applications. With its I2C/SMBus programmability, it can be used to meet specific customer requirements. The ISL6251 is also compliant with USB-C PD Standards, making it an ideal solution for a growing range of USB-C powered products.

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