Evaluation board verifies battery management for the IoT

To verify operation of battery management in electronic devices such as wearables, industrial IoT products, such as smart cards and electronics shelf labels as well as portable devices, Rohm has developed the REFLVBMS001-EVK-001. 

Devices used in any of these applications continually need to be made smaller and thinner yet also have to support larger battery capacities and lower power consumption to improve usability and convenience.

The REFLVBMS001-EVK-001 evaluation board provides high efficiency battery management for thin, compact IoT devices by combining Rohm’s low power consumption analogue ICs which incorporate original Nano Energy low current technology as well as its charge control ICs which are compatible with a range of rechargeable batteries.

The REFLVBMS001-EVK-001 is equipped with a power supply IC (buck DC/DC converter IC) and reset IC (voltage detector IC) utilising original Nano Energy low current consumption technology. A battery charger IC supports low voltage rechargeable batteries and the board also has NGK Insulators’ thin, large capacity EnerCera li-ion rechargeable battery. The low current consumption of the power supply IC (quiescent current 180nA) minimises loss. 

The battery charger IC is suitable for a wide range of charge voltages. It is capable of charging, monitoring and discharging batteries making it suitable for compact IoT devices. The low-profile, efficient battery management is just 0.6mm thick for mounted components (including the thin rechargeable battery).

Rohm’s Nano Energy low current consumption power supply IC minimises loss and the battery charger IC provides optimal charging for a variety of rechargeable batteries, added the company.

The evaluation board REFLVBMS001-EVK-001 consists of an EnerCera EC382704P-C rechargeable battery which is 0.45mm thick and which has a capacity of 27mAh. The Nano Energy IC BD70522GUL has a quiescent current of 180nA ensuring low power consumption. The third component is the battery charger IC BD71631QWZ for batteries in the range of 2.0 to 4.7V, which is suitable for monitoring, charging, and discharging batteries. In addition, the reset IC BD5230NVX-2C is used for detecting abnormal voltages as standby current of 270nA, while low standby current minimises loss. This makes it possible to extend the overall standby by a factor of 60 in comparison with existing solutions, and enables proper, evaluation of an efficient battery management system, said Rohm. All mounted components are less than 0.60mm thick (1.60mm including the board) which enables the reference design to be used for thin IoT applications such as smart cards, and wearables (smart watches, keyless entry) and compact industrial IoT devices (electronic shelf labels, smart meters and alarms) and other IoT equipment requiring smaller, thinner form factors and longer battery life.


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