Low heat generation with the industry’s first misalignment detection function ensure high efficiency operation
Willich-Munchheide, February 12th, 2014 – ROHM has recently announced the development of a wireless power receiver IC designed to charge smartphones and other portable devices. The BD57011GWL is compliant with WPC’s (Wireless Power Consortium) latest Qi Low Power Ver1.1 standard for wireless power transmission and features low heat generation in a monolithic design, reducing temperature rise by up to 75% during wireless charging. This provides the ideal balance between mounting area and heat generation. In addition, the industry’s first misalignment detection function detects incorrect positioning of the target device on the charging pad, which can lead to decreased charging efficiency.
Wireless power transmission technology eliminates the need for a power cord for charging portable devices, is expected to improve the waterproof and dustproof properties of device connectors, and supports a variety of terminals with a single wireless charger. However, a major challenge with 5W-class wireless power transmission for smartphones and other portable equipment is the relatively large amount of heat generated during charging.
1. Low heat generation in a monolithic (single-chip) design
Cutting-edge BiC-DMOS processes are utilized for the lowest MOSFET ON resistance possible. This, along with an optimized monolithic design, provide an ideal balance of small mounting area with low heat generation, reducing temperature rise during wireless power charging by approximately 75% compared with conventional solutions.
2. The industry’s first misalignment detection function improves charging efficiency
During charging, incorrectly positioning the target device on the charging pad may cause a significant drop in charging efficiency. To prevent this, ROHM has included a misalignment detection function that triggers an alarm, allowing the user to reposition the device to achieve maximum charging efficiency.