180nA DC-DC converter supports ten year operation from a single coin cell
The BD70522GUL measures just 1.76mm x 1.56mm x 0.57mm and uses switching frequencies of between 0 and 1MHz, depending on the load. It works with supply voltages from 2.5V to 5.5V and supplies 1.2V, 1.5V, 1.8V, 2.0V, 2.5V, 2.8V, 3.0V, 3.2V or 3.3V outputs.
The accuracy of the output voltage is ±2.0% (at 10mA), the maximum output current 500mA. The operating temperature range is between -40°C and +85°C. The new DC/DC converter is ideal for compact battery-powered devices such as wearables, IoT sensor nodes and other industrial equipment such as alarms and electronic shelf labels.
In recent years, the number of battery-powered devices such as smartphones and wearables for IoT has risen sharply. This increases the demand for smaller components that not only offer greater design flexibility and more space for integrating new features, but also extend battery life by reducing power consumption. To meet the needs of the IoT market, Rohm used its expertise in power components with low power system design for the converter.
The ‘nanoenergy’ design uses low-current analogue technologies for control circuitry and analogue layout optimised for power supply ICs, and the device is built on a 0.35µm BiCDMOS power process. In addition to the low-loss MOSFETs, a Seamless Switching Mode Control (SSMC) function is integrated, which automatically switches the load mode depending on the load current. This allows the converter to deliver a power conversion efficiency of more than 90% over a wide load range from 10µA to 500mA and consume less than 1µA in standby mode. This increases the battery life of numerous devices and applications.
Both the BD70522GUL and its evaluation board (BD70522GUL-EVK-101) are available for purchase through online distributors.
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