News Release

- New Product Information -

AKM’s step-up DC-DC converter enables practical implementation of Microbial Fuel Cell (MFC) in sensing technology and data transfer

Product Name
Product Category:
Energy Harvesting
Ultra-low power consumption step-up DC-DC converter
・ Capturing small amounts of energy, (Energy harvesting; Single photovoltaic cell, Rectenna, MFC, Carbon Nanotube, Current Transformer, Piezoelectric, etc)
・Trigger switch system with zero standby current


Energy harvesting is the technology that derives small amounts of energy directly from the environment and converts it into electric power. Efficient power management is a key component for energy harvesting. One of the biggest issues is consumption from the power management function is greater than the energy supply from the environment. Therefore, there are so many energy sources that have never been used in our environment, (e.g., optical energy, thermal energy, wind energy, bioelectrochemical and kinetic energy).
AKM has developed a step-up DC-DC converter that works only consuming 1μW of power. The AP4470 helps provide long term, multipoint and a low-cost sensing network. This accelerates large-scale Internet of Things (IoT) implementations.

Customer Story

sensingnet Inc. has been developing Regenerative Sensing System using the AP4470 for sustainable power sources.

The National Agriculture and Food Research Organization (NARO)' s MFCs have been tested together with the AP4470 and various sensors to contribute to practical agricultural and environmental applications.


● 0.2V input self-startup without transformer

The AP4470 requires only 0.2V input to start boosting without the need for an external transformer. This helps minimize energy harvesting materials size and simplify the structure. The AP4470 enables new ways to provide power to drive sensors, displays and wireless modules.

● Embedded Power Supply and Protection Functions

The AP4470 has 2 switches that control the power supply for target devices, (sensors, wireless modules, LEDs), and protect external storage, (capacitors), and the target. This provides a self-powered wireless sensor node, display system with simple hardware design.


The AP4470 converts DC inputs up to 3.55V and monitors external storage. When the external storage’s voltage reaches 3.3V, the AP4470 automatically starts supplying to target devices. If the voltage drops down to 2.6V, the AK4470 stops supplying voltage and current via on-chip switch function.

● Power Indicators

2-types of power indicators offer a reset function and trigger switch with zero standby current. The AP4470 has a pin that outputs a signal when the boosting circuit becomes active. The AP4470 has another pin which outputs a signal when the AP4470 starts supplying, which means external storage’s voltage reaches 3.3V.

Main Specifications

Ultra-low power consumption step-up DC-DC converter
Startup Voltage0.2V (typ.)
Power consumptionThe boosting is active: 7μA (typ.) at VIN=0.4V
The boosting is off: 0.5μA (typ.) at VIN=0.4V (including over charge protection current which is 0.36μA)
Boosting indicator
Output signal when the AP4470 starts boosting. (Open drain output)
Power good indicatorOutput signal when the AP4470 starts supplying to a target device. (Open drain output)
Operation Temperature-30 to +85°C
HWQFN  (3.0 × 3.0 × 0.75mm, 0.5mm pitch)
Sampling ScheduleOctober 2018
* Information on this page is current on the date of press release.
* AKM is a trademark of Asahi Kasei Microdevices Corporation in Japan, Europe and the United States.
* Appellations, company names and product names on this page are trademarks or registered trademarks of respective companies.

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