OmniVision has released a new generation of ultra-low static current high efficiency synchronous step-down converter

     It is estimated that by 2030, the Internet of Things will create 5.5 trillion to 12.6 trillion dollars of economic value in the world , and the number of Internet of things connections in China accounts for up to 30% of the global total, and will exceed 8 billion by 2025 . The market for wearable devices is also expanding rapidly. According to IDC, the global shipment of wearable devices exceeded 350 million units from 2020 to 2021, and the domestic market size is expected to increase to 46.26 billion yuan by 2025 

     The explosive growth of iot applications and wearable devices cannot be enabled without power management technology. Small and portable battery-powered devices, such as Bluetooth headphones, smartwatches, video doorbells, and item trackers, are usually compact in size and have limited battery capacity. At the same time, they are required to be able to stand by for a long time and respond quickly, which puts forward high requirements on the low-power performance of the power system and the device itself. Battery life and "wake up" response speed are the core performance of the device. Therefore, with ultra-low static current, ultra-fast instantaneous response of synchronous step-down converter designers favored.

     Dedicated to improving the performance of the Internet of Things and wearable devices, OmniVision a leading global developer of semiconductor solutions for advanced digital imaging, analog, touch and display technologies, has released the WD1020/WD1021, a new generation of highly efficient synchronous step-down converters.

     The series features an ultra-low 360nA static current. High efficiency at light loads as low as 10uA. Up to 97% efficiency in full load range. With an advanced peaking current control architecture, the WD1020/WD1021 provides excellent dynamic response over a wide range of loads, effectively extending the life of battery-powered products, making it ideal for powering sensors, MCUS, wireless communications, and other system components.

     By using three VSEL pin codes, WD1020/WD1021 can achieve eight different voltage outputs. When the input voltage is reduced to close to the output, it can automatically switch to the 100% duty cycle mode to expand the battery operating voltage range and enhance the battery life ability. Depending on the load size, the WD1020/WD1021 can also automatically switch to PFM or PWM mode to ensure that the WD1020/WD1021 can be operated in light load (< Industry-leading operating efficiency is maintained over the entire load range from 1mA to full load.

     In addition to ensuring battery life, designers need to balance high performance with small size and efficiency. In terms of package and size, WD1020/WD1021 adopts CSP-8L package, with a super small size of 1.61mm×0.82mm. At the same time, the internal slope compensation is integrated to reduce the number of peripheral devices, and the switching frequency of up to 1MHz, can be combined with small ceramic chip capacitors and inductors to achieve a very compact overall solution. It provides good adaptation for small mobile applications such as smart watches, TWS headphones and smart bracelets, and saves valuable internal space for product design.