Nano Cap technology eliminates capacitors in linear regulator designs

Nano Cap technology eliminates capacitors in linear regulator designs

Technology News |
By Nick Flaherty

Rohm has developed a power supply technology that ensures stable control of power supply circuits in the automotive and industrial designs while cutting the number of capacitors required for a linear regulator.

Integrating the Nano Cap analogue technology with proprietary process technology into a device provides tighter control of the power lines and actively compensates for the parasitic capacitances. This optimized control eliminates the problem of operational stability regarding capacitors in power circuits, reducing the design time and footprint of applications in the automotive, industrial equipment, consumer, and other fields.

In a circuit of a linear regulator and MCU for example, a 1µF capacitor is usually required at the output of the linear regulator while 100nF is needed at the input of the MCU. Using a linear regulator with the Nano Cap technology eliminates the need for the capacitor at the regulator output and ensures stable operation with just the 100nF input capacitor.

Decreasing both the number of capacitors along with the capacitance needed for power supply circuits in the automotive and other fields, reduces the complexity of the design.

Given an industry requirement for output voltage fluctuation of ±5.0% max. with a 50mA load current fluctuation with 100nF capacitance, chips with Nano Cap achieve a stable operation of ±3.6% in evaluations, compared with conventional linear regulators whose output voltage can vary by as much as ±15.6%.

Op amp samples with Nano Cap technology have already been released in part, and linear regulators with the technology and LED drivers with built-in Nano Cap regulators are scheduled to be released in 2020.

The Nano Cap technology follows the development of ultra high-speed pulse control technology Nano Pulse Control and ultra-low current technology Nano Energy.

The Nano Pulse Control enables a switching ON time in the order of nanoseconds (ns), making it possible to convert from high to low voltages using a single chip. This contributes to greater miniaturization and system simplification in 48V applications ranging from mild hybrid vehicles and industrial robots to base station sub power supplies.

The Nano Energy current technology features a no-load current consumption in the nA range by minimizing the trade-off that occurs when reducing current consumption at ultra-light loads. This enables a ten year lifetime from a coin cell for battery-driven designs in the Internet of Things (IoT).

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