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Buck-Boost Converters Boast Low 75nA IQ

Texas Instruments (TI) has introduced what it claims is the industry’s first DC-DC buck-boost converter to combine programmable input current limit and integrated dynamic voltage scaling to extend battery life by at least 50%. The TPS63900 maintains the industry’s lowest quiescent current (IQ), 75 nA, with 92% efficiency at 10 µA and delivers up to three times more output current than competing devices, says TI. This is expected to help engineers extend the life span of battery-powered industrial and personal electronics applications.

It is a common challenge for engineers to design for low IQ while providing enough output current to send signals between connected smart grid applications and a network via commonly used radio-frequency standards, says TI. These include narrowband Internet of Things (IoT), Bluetooth Low Energy, and long-range and wireless M-Bus. The TPS63900 helps engineers conserve energy in wirelessly connected applications that run on batteries.

The TPS63900 integrates dynamic voltage scaling to deliver power while keeping the system at the minimum voltage required to operate efficiently, maximizing battery life and reducing required maintenance for industrial applications. This feature enables design engineers to optimize power architectures for ultra-low-power sensors and wireless connectivity integrated circuits, supporting applications that can operate for at least 10 years using the primary battery. For example, the buck-boost converter can be paired with TI’s MSP430FR2155 in security sensors or wireless IoT sensors to monitor the vibration of water pumps for predictive maintenance and help drive down costs.

As the industry’s lowest IQ buck-boost converter to integrate a programmable input current limit, the TPS63900 efficiently charges supercapacitors to buffer peak loads, protect battery capacity, and extend system lifetime and performance. Fully charged supercapacitors help buffer the energy required to operate components that require high peak currents, such as those found in motorized smart locks.

The TPS63900 increases the stability of connected applications by reducing up to 50% of the output-voltage ripple caused by load transients. The new buck-boost converter’s ultra-fast transient response maintains low IQ while keeping the internal regulation loop active. This capability is particularly beneficial for applications like smart water and gas meters that are always on but need to consume high power in a short amount of time when sharing data.

The TPS63900 is now available through TI and authorized distributors in a 2.5-mm-by-2.5-mm wafer small outline no-lead (WSON) package and is priced at US$0.80 in 1,000-unit quantities. Full and custom quantity reels are available on and through other channels. The TPS63900EVM evaluation module is available on for US$49.


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Buck-Boost Converters Boast Low 75nA IQ

by Circuit Cellar Staff time to read: 2 min