Renesas Electronics Corporation recently came up with the first USB C™ buck-boost battery charger for giving support to both Hybrid Power Buck-Boost (HPBB) and Narrow Voltage Direct Charging (NVDC) charging power banks, tablets, ultrabooks, and notebooks with the help of reversible USB Type-C™ connector cable. With the help of firmware control, the ISL9241 will be able to switch between HPBB and NVDC modes offering a smaller and cost-effective solution that efficiently processes myriad of power levels. It takes leverage from Renesas’ advanced R3™ modulation technology for better light-load efficiency with ultra-fast transient response to longer lasting battery run time. The reconfigurable internal charger registers permit better usage of smaller inductor for HPBB mode to get better efficiencies across several power levels.
Fig. 1: Image Representing USB-C Combo Buck-Boost Battery Charger
The ISL9241 is capable of delivering several things including protection features, system bus regulation, and charging features with NFETs for best BOM (bill of material) cost optimization and efficiency. This charger can work with a single battery with just one adapter or both when connected. It takes in DC input power from travel adapters, conventional adapters, as well as USB Type-C PD (Power Delivery) ports and can safely charge up battery packs up to four-cell Li-ion series batteries. In the NVDC mode, the ISL921 can select the adapter or battery automatically as the system power source. The NVDC operation is also capable of supporting turbo mode by switching on the BGATE FET for limiting adapter current at the set point. The NVDC is ISL9241’s initial startup state right before the system controller’s firmware transforms the configuration to the HPBB. When the HPBB is in higher power mode, the ISL9241 backs up bypass plus charging, reverse turbo-boost mode plus charging, bypass, and reverse turbo-boost mode.
As Andrew Cowell, the Vice President of Battery & Optical Systems Division at the Renesas Electronics Corporations puts it, “The ISL9241 combo NVDC and HPBB battery charger gives customers the highest level of flexibility along with optimized system performance and maximum efficiency. Mobile computing OEMs count on Renesas to consistently deliver power management innovations that help them differentiate their products with thinner form factors and longer battery life.”