采用BCDMOS技术的电流模降压型DC-DC转换器功率级设计

给出采用0.8μm 30 V BCDMOS工艺技术的电流模降压型DC-DC转换器的功率级设计,该功率级可以输出3 A负载电流,转换效率可达到92%.主要描述了电流模降压型DC-DC转换器功率级的建模以及功率级电路和版图设计,包括功率晶体管及驱动电路、功率晶体管采样电流及斜波补偿电路,最后给出了该功率级设计的测试结果.     

Wireless power charger for wearable medical devices with in‐band communication

A wireless power charger integrated circuit has been developed for wearable medical devices in a 0.18‐µm Bipolar, Complementary metal‐oxide‐semiconductor, and Lightly‐Doped Metal‐Oxide‐Semiconductor (BCDMOS) process. A passive full‐wave rectifier consisting of Schottky diodes and cross‐coupled n‐type Metal‐Oxide‐Semiconductor (nMOS) transistors performs the alternating current to direct current power conversion without any reverse leakage current. To charge a battery, a linear charger circuit follows the passive rectifier instead of a switching charger circuit for the small form factor of wearable medical devices. An in‐band communication circuit notifies the proper connection of the wireless power receiver and the battery charging status to the charging pad (wireless power transmitter) through the wireless power transmission channel. The wireless power charger integrated circuit occupies 1.44‐mm² silicon area and shows 31.7% power efficiency when the charging current is 26.6 mA. Copyright © 2015 John Wiley & Sons, Ltd.     

低压差电压调节器技术发展动态

介绍了电源和功率管理集成电路市场，描述了低压差(LDO)电压调节器技术的发展进程和未来趋势；对国内外LDO产品和技术现状进行了比较，提出了发展LDO的建议。     

A switch‐mode boost DC–DC converter for IR‐drop compensation of charging cable

A switch‐mode boost DC–DC converter has been developed to compensate for the IR‐drop because of the finite resistance of a charging cable. The boost ratio of the DC–DC converter is adaptively controlled by an IR‐drop sensing circuit to provide the required voltage level to a battery charger regardless of the cable resistance. Implemented in a 0.18 µm BCDMOS process, the IR‐drop compensating switch‐mode boost DC–DC converter occupies 6.2 mm² active area and shows the 93.2% peak efficiency. The proposed IR‐drop compensating boost converter can be applied to compensate for the IR‐drop of any type of charging cables. Copyright © 2014 John Wiley & Sons, Ltd.