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R1801 Buck DC/DC Converter

RICOH Electronic Devices’ R1801 converter for energy harvesting with adjustable maximum power point control and output voltage

Image of RICOH Electronic Devices' R1801 Buck DC/DC ConverterRICOH Electronic Devices’ R1801 buck DC/DC converter is designed for use in the Internet of Things (IoT) ecosystem by extracting energy from photovoltaic or piezoelectric cells. It is used to power small devices in applications such as wireless sensors, home and building automation, remote monitoring, presence detection, and industrial equipment controls as well as wearables and fitness sensors.

The R1801 makes small energy autonomous devices protect the environment by reducing the use and waste of primary batteries while eliminating the impact of cabling cost and maintenance to replace batteries regularly. A vast number of these devices can be deployed in environments such as offices, buildings, hotels, industrial sites, airports, malls, remote monitoring infrastructures, and wearable fitness/healthcare devices.

The DC/DC converter converts energy and stores it in battery or supercapacitor storage elements. An ultra-low quiescent current of 200 nA allows the use of the harvester circuit even in a low-illuminated environment when the generated level of energy is moderate. 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 until the energy drops below a threshold. This process repeats and increases the voltage in the energy storage device until the required level is reached.

The advanced R1801 has a few additional features like an adjustable maximum power point control and adjustable output voltage making it possible to optimize the performance of the electrical circuit in combination with the selected type of harvester. The level is controlled in a 100 mV step by the binary setting of three inputs and has a range of ±300 mV.

A power good output is present to provide a logic signal as soon the output voltage reaches a specific level and can be used to enable additional circuits for operation. The minimum required power to start-up the IC is 1 µW and its peak efficiency is around 80% at 10 µA output current. A reverse current protection circuit is triggered when the input voltage drops below the output voltage, preventing current flow from output to input as soon the energy harvesting cell does not provide energy. The R1801 is available in a DFN(PLP) 2730-12 package.

Features
  • Input voltage: 2.2 V to 5.5 V
  • Output voltage: 2.2 V to 4.5 V
  • Output voltage accuracy: ±3.0%
  • Maximum power point control voltage range: 2.7 V to 5.3 V
  • Operating quiescent current: 200 nA typ.
  • Starting power: 1 µW
  • Reverse current protection
  • Adjustable maximum power point control
  • Adjustable output voltage
  • Power good output
  • Output current: 1 mA
  • Peak efficiency: 80% at 10 µA
  • DFN(PLP) 2730-12 package
Applications
  • IoT devices
  • Wireless sensors
  • Energy harvesting

R1801 Buck DC/DC Converter

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Published: 2020-10-16