TIDUEO0C July 2019 – March 2021
This reference design showcases a boost, buck, and a buck-boost power supply topology with nano-amp current for battery operated devices such as smart flow meters with lithium manganese dioxide (LiMnO2) primary batteries. This can support various wireless technologies including: Sub-1 GHz, BLE, NB-IoT, and others. This design powers commercial off-the-shelf narrowband modules for Internet of Things (IoT) applications. The three power supply topologies are paired with the Battery and System Health Monitoring Reference Design hardware (TIDA-01546), which provides highly-accurate State-of- Health (SOH) calculation for the battery lifetime. The always-on in-system current monitoring detects the current peak of the RF transmission and the SOH measurement is scheduled afterwards with an adjustable delay.
All three power topologies offer high efficiency over a wide load range including light load conditions with the TPS63900 offering > 90% efficiency at a 10-µA load. This high efficiency at light load conditions greatly decreases power consumption during standby operation resulting in prolonged battery life.