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Ricoh launches Buck DC/DC Converter with 144 nA quiescent current for Energy Harvesting applications

Amstelveen, the Netherlands, 04 January 2018 - Ricoh Electronic Devices Co., Ltd. in Japan has launched the R1800 Buck DC/DC Converter, designed for use in energy harvesting devices which are able to collect and store energy obtained from sources such as solar or vibration energy. Target applications include wearables for sports and healthcare, wireless sensors and IoT devices.PR25_Ricoh_R1800_2017_18oLogos.png


This is a DC/DC converter collecting energy generated from a photovoltaic or vibration energy harvester cell and stores it in a super capacitor or rechargeable battery. An ultra-low quiescent current of 144 nA even allows to use the harvester circuit in a low-illumination environment and when the generated level of energy is moderate. The R1800 enables the development of battery less applications, which neither need battery replacement maintenance nor need power from mains to recharge. Instead, the application will operate as long there is sufficient light or vibration available.


As soon as there is sufficient energy available on the input side, the buck DC/DC Converter will be enabled to transfer energy from input to output. During this phase the transferred energy is stored in a super capacitor or battery on the output until the energy left on the input drops below a threshold. The DC/DC Converter is disabled and new energy will be collected on the input. This process repeats and increases the energy level in the capacitor or battery until the required output voltage is reached.


A reverse current protection circuit prevents that a current flow will occur from output to input as soon the energy harvesting cell does not provide energy, the circuit is triggered when the input voltage drops below the output voltage.


Pricing and Availability

The R1800 is available in a DFN(PLP)2730-12 package.
For more information about Pricing and availability info via email:


Features R1800     

Input Voltage Range 2.0 V to 5.5 V
Output Voltage Range 2.0 V to 4.5 V
Output Voltage Accuracy ±3.0%
Output Current 2 mA
Quiescent Current (at no load) Typ. 144 nA
Protection Circuits Reverse Current
Peak Efficiency 92%
Package R1800K DFN(PLP)2730-12


About Ricoh

Ricoh is empowering digital workplaces using innovative technologies and services enabling individuals to work smarter. For more than 80 years, Ricoh has been driving innovation and is a leading provider of document management solutions, IT services, commercial and industrial printing, digital cameras, and industrial systems.

Headquartered in Tokyo, Ricoh Group operates in approximately 200 countries and regions. In the financial year ended March 2017, Ricoh Group had worldwide sales of 2,028 billion yen (approx. 18.2 billion USD). For further information, please visit


In March 2001 Ricoh Europe (Netherlands) B.V. established the Semiconductor Support Centre to support European distributors and electronics designers and manufacturers with their applications or other enquiries about Power Management and Real Time Clock ICs. For further information, please visit