
Ultra-high-speed pulse control technology Nano Pulse Control™
Ultra-low-current technology Nano Energy™
Extremely stable control technology Nano Cap™

What is ‘Nano’ Power Supply Technology?
What is the Nano Series?
Revolutionary power supply technologies that leverage analog expertise cultivated over many years to achieve greater miniaturization and energy savings.
The Nano Series, developed using our integrated production system in which all processes, from development to products, are performed in-house, consists of power supply ICs designed to meet current and future market needs.
Ultra-high-speed pulse control technology
Nano Pulse Control™
Convert high voltages to low voltages using a single IC. Achieve simpler, more compact systems.

Ultra-low-current Technology
Nano Energy™
Enables long-term drive in battery-equipped devices

Extremely stable control technology
Nano Cap™
Nano Cap™ power supply technology that ensures stable control of power supply circuits in the automotive and industrial fields – even with ultra-small capacitances in the magnitude of nF.

Technical explanation
Nano Pulse Control™
Convert high voltages to low voltages using a single IC.
Achieve simpler, more compact systems.
Development Background
The proliferation of hybrid and electric vehicles in response to the growing need to curb CO2 emissions on a global scale has brought attention (particularly in Europe) to mild hybrid vehicles that provide better cost performance than full hybrids. Mild hybrid systems utilize a 48V lithium ion battery to deliver greater efficiency over conventional 12V power supplies. However, the many ECUs used in many vehicle systems demand lower drive voltages, typically 3.3V but as low as 2.5V.
To convert 48V to 3.3V at 2MHz (to prevent interference with the AM radio band) conventional solutions employ 2 stages (2 chips), the first to step-down to an intermediate voltage such as 12V. In 48V systems it is also necessary support step-down operation from a maximum voltage of 60V to 2.5V, requiring an extremely high step-down ratio of 24:1 when using a single chip.


Technology Development and Commercialization
At ROHM, we challenged ourselves with the extremely high goal of developing ultra-high-speed pulse control technology (Nano Pulse Control) for monolithic (single-chip) DC/DC converters. As a result, we were able to reduce the switching ON time to an unprecedented 9ns, the smallest in the world and a breakthrough accomplishment considering that the typical ON time is around 120ns. Another major benefit of this technology is stable control at extremely narrow pulse widths.
Development involved breaking from convention by leveraging proprietary analog design technology and power supply process expertise along with our vertically integrated production system. As a result, step-down operation from 60V to 2.5V is achieved through the BD9V100MUF monolithic buck DC/DC converter with integrated MOSFET.

A world of possibilities
Developing a DC/DC capable of stepping down from 60V to 2.5V on a single chip significantly reduces the number of parts compared to conventional 2-chip systems. In particular, at higher frequencies it becomes possible to greatly reduce the size of the coil.
This will allow users to simplify system design, reduce application size, and at the same time decrease costs. For example, minimizing the size and costs of 48V power supply systems used for mild hybrid cars, industrial robots, and base station sub-power supplies is expected to contribute to the advancement of society.
In addition to the BD9V100MUF, ROHM will continue to develop products incorporating Nano Pulse Control to meet customer demands.
Nano Energy™
Enables long-term drive in battery-equipped devices
Development Background
In the electronic equipment field, in addition to the increasing functionality of smartphones and widespread use of wearables, the introduction of IoT devices that can operate and communicate wirelessly between devices without human intervention is attracting attention. In many cases these devices are driven by batteries, making it necessary to reduce power consumption. And although improving design and securing space for integrating new functions are progressing, miniaturization is also an important factor, leading to smaller drive batteries, but there is a large number of devices where maintenance (i.e. changing batteries) cannot be carried out regularly, especially in the IoT field, driving the demand to enable long-term operation (10 years) on a single coin battery.
In response to these market trends and themes, ROHM began developing technologies to significantly reduce IC power consumption. At the start, the lowest current consumption in the industry for power supply ICs was 360nA. This provided a baseline for our efforts.

Technology Development and Commercialization
When simply considering reducing current consumption, the first option is to raise the resistance value of the circuit, but this can lead to problems such as element current leakage, increased sensitivity to noise, and reduced response speed. In response, ROHM developed Nano Energy, a breakthrough technology that decreases current consumption during ultra-light loads while minimizing the ensuing trade-off. The result is a current consumption of 180nA, the smallest in the world*.
This technology was used to develop the BD70522GUL DC/DC converter, which delivers twice the battery drive time of conventional products at no-load (standby). In addition, high 90% power efficiency is enabled in the widest current range in the industry: 10uA to 500mA. ROHM was able to achieve these characteristics by leveraging proprietary circuit design, layout, and process technologies with its original vertically integrated production system.

A world of possibilities
Dramatic reductions in the power consumption of power supply ICs in the IoT field has brought about a demand to achieve 10-year drive on a single coin battery. This allows for a reduction in the amount of labor and costs required for device maintenance by enabling long-term drive with small batteries even in wearables that are becoming increasingly compact and multifunctional.
In addition, it will be possible to continue operation even in extremely low-power environments, such as energy harvesting systems that generate small amounts of electricity from light, heat, and vibration (which is expected to see increased adoption in a variety of fields).
At ROHM, Nano Energy will be used as a core technology to expand its lineup of power supply ICs to meet a range of customer requirements. At the same time, we plan on promoting the use of PMICs (Power Management ICs).
Nano Cap™
Nano Cap™ power supply technology that ensures stable control of power supply circuits in the automotive and industrial fields – even with ultra-small capacitances in the magnitude of nF.
Development Background
ROHM is committed to further enhancing the development of Nano Cap™ technology to completely eliminate the need for capacitors while expanding the use of this technology not only to linear regulators, but Op amps, LED drivers, and other analog ICs as well, which contribute to society through the effective use of resources that minimizes environmental load.


Details of Technology
Nano Cap provides stable control of linear regulator output by improving response in analog circuits while minimizing parasitic factors related to wiring and amplifiers, making it possible to reduce the output capacitance to less than 1/10th over conventional solutions.
As a result, circuits composed of a linear regulator and MCU which usually require a 1uF capacitor at the output of the linear regulator and a 100nF at the input of the MCU as mentioned above, ROHM’s Nano Cap™ linear regulator technology achieve stable operation using just one 100nF capacitor at the MCU side.
Given an industry requirement for output voltage fluctuation of ±5.0% max. (in case focusing on just fluctuation) with respect to 50mA load current fluctuation with 100nF capacitance, Nano Cap™ equipped chips achieve a stable operation of ±3.6% in the evaluations, compared with conventional linear regulators whose output voltage can vary by as much as ±15.6%.

Pickup Product
Nano Pulse Control™
Stable control is possible even with extremely short pulse widths, resulting in a unprecedented step-down ratio
key point
- Power supply system with breakthrough step-down ratio integrated into a single chip
- Smaller footprint (including coll)
■Buck Converter Integrated FET
16V to 60V, 1A 1ch 2.1MHz, Integrated FET
4.5V to 36V, 5A, 1ch, 600kHz or 1MHz or 2.2MHz, Integrated FET
■Buck Converter Integrated FET For Automotive
16V to 60V, 1A,1ch 2.1MHz , Integrated FET
2.7V to 36V, 2A, 1ch, with Boost Function, 2.2MHz, Integrated FET
3.5V to 40V, 1A or 2A, 1ch, 2.2MHz, Integrated FET
Nano Energy™
Achieves stable operation at ultra-small currents by reducing the power consumption of the IC itself
■Buck Converter Integrated FET
Ultra Low quiescent current(180nA), 1ch, Integrated FET
BD70522GUL View models■Voltage Detectors for Automotive
Ultra Low quiescent current(500nA), 40V, 125℃, Over/Under Voltage Detection Window Type, SSOP6 Package
BD48HW0G-C View modelsUltra Low quiescent current(270nA), 105℃, Under Voltage Detection, SSOP5 Package
BD52(53)xxG-2M View line-upUltra Low quiescent current(270nA), 125℃,Under Voltage Detection, SSOP5 Package
BD52(53)xxG-2C View line-upUltra Low quiescent current(270nA), 125℃,Under Voltage Detection, SSON004R1010 Small Size Package
BD52(53)xxNVX-2C View line-upUltra Low quiescent current (300nA), 125℃, Over Voltage Detection, SSOP5 Package
BD70(73)xxG-2C View line-upNano Cap™
Stability control eliminates operational issues related to capacitors in analog circuits
■High Speed CMOS Operational Amplifier
1ch, High Speed Ground Sense, Excellent EMI Characteristics CMOS
BD77501G View models2ch, High Speed Ground Sense, Excellent EMI Characteristics CMOS
BD77502FVM View models■Single-Output LDO Regulators For Automotive
Automotive Primary Power Supply 45V,150mA
BD9xxN1-C View line-upRelated content
Nano Pulse Control™
・Reverse thinking can make the impossible possible.
Direct conversion from 48 V to 1 V
Flying start with a pulse width of 9 ns
Nano Cap™
・New Nano Cap™ Power Supply Technology Significantly Reduces Capacitance
・High-Speed Op Amps Prevent Oscillation due to Load Capacitance “BD7750x Series”
Nano Pulse Control™ is a trademark or registered trademark of ROHM Co., Ltd.
Nano Energy™ is a trademark or registered trademark of ROHM Co., Ltd.
Nano Cap™ is a trademark or registered trademark of ROHM Co., Ltd.