Industry’s first dual mode battery charger devices
The BD99954GW/MUV generates a charging voltage from 2.56 to 19.2V for 1 to 4 cells through boost-buck control and as the industry’s first dual-input charging system automatically switches charging operation without the need of an MCU by using a built-in charging adapter function. The device is compatible with the USBPD and USB BC 1.2 standards used by USB Type-C designs in smartphones, tablets and laptop PCs, allowing dual-mode systems capable of simultaneous charging via USBPD or an AC adapter.
A growing number of portable devices, including notebook PCs, are adopting the USB Type-C PD standard that can charge up to 100W, providing a common charging platform. At the same time wireless charging is gaining traction, increasing the demand to support both charging methods. However, in order to deliver a wide power supply range required by USBPD, a boost function must be added to the system to charge 2-cell (~8.4V) batteries from conventional 5V chargers. Proprietary semiconductor technologies allowed ROHM to meet these needs and develop dual-input charging ICs that support both USBPD and 5V inputs in a single package.
The BD99954GW and BD99954MWV support the two predominant charging methods for the latest portable devices via the built-in charging adapter discrimination function that enables automatic switching between modes. This eliminates the need to mount external peripheral components such as transistors and resistors typically necessary for each charging system (for charge path switching and backflow prevention), significantly reducing both mounting area and design load.
Step-up/down control makes it possible to generate the charging voltages necessary for USBPD operation (5V to 20V). For example, when charging a 2-cell battery (~8.4V), boost-buck control enables step-down operation from 20V to 8.4V as well as step-up from 5V to 8.4V. In addition, compliance with the popular USB BC1.2 and USBPD standards provides support for both conventional USB and the newest USB PD charging protocols.
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