DC-DC converter has programmable input current limit and dynamic voltage scaling

September 02, 2020 //By Nick Flaherty
DC-DC converter has programmable input current limit and dynamic voltage scaling
The TPS63900 DC-DC converter from TI combines a programmable input current limit and dynamic voltage scaling to extend battery life by 50 percent

Texas Instruments (TI) has launched the first buck-boost DC-DC converter to combine programmable input current limit and integrated dynamic voltage scaling.

The TPS63900 maintains a quiescent current (IQ) 75 nA, with 92 percent efficiency at 10 µA and delivers up to three times more output current than competing devices to help engineers extend the life span of battery-powered industrial and personal electronics applications.

A common challenge for engineers is to design for low quiescent current while providing enough output current to send signals between connected smart grid applications and a network via commonly used radio-frequency standards, such as narrowband Internet of Things (IoT), Bluetooth Low Energy, and long-range and wireless M-Bus. The programmable input current limit and integrated dynamic voltage scaling helps engineers conserve energy in wirelessly connected applications, boosting battery life by 50 percent.

The dynamic voltage scaling in the DC-DC converter 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. To learn more, read “5 best practices to extend battery life in flow meters.”

The programmable input current limit allows 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 also 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


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