ROHM develops buck-boost DC/DC converter with significant energy-saving advantages

ROHM, a world-renowned semiconductor manufacturer (headquartered in Kyoto, Japan), has developed the BD83070GWL, a buck-boost DC/DC converter*1 with built-in MOSFET, for mobile devices, wearable devices, and IoT devices. The product achieves ultra-high efficiency and ultra-low current consumption.

The "BD83070GWL" is an ultra-low power buck-boost power IC developed for small battery-driven electronic devices with the goal of becoming a "benchmark for low-power, environmentally friendly components." The product has a built-in low-loss MOSFET and a low-power consumption current circuit. When various battery-driven devices (electric toothbrushes and shavers, etc.) are working (at a load current of 200mA), the power conversion efficiency is as high as 97%, and the consumption current is only 2.8µA, which is also an extremely high level in the field of buck-boost power ICs. Therefore, compared to ordinary products, the efficiency of the application is greatly improved, and the battery life can be extended by 1.53 times during standby (at a load current of 100µA) (ROHM survey data), which is very helpful in extending the battery life of various electronic devices driven by small batteries.

In recent years, battery-driven electronic devices such as mobile devices, wearable devices, and IoT devices have rapidly become popular. In order to increase product design flexibility and secure space for configuring new functions, the power consumption of components installed in these products must be reduced to the minimum, thereby achieving miniaturization and extending battery life.

ROHM has been committed to developing power ICs that meet market demand by making full use of its analog design technology, power system technology, and vertically integrated production system advantages. Among them, high-efficiency, ultra-low power ICs such as the boost power IC "BU33UV7NUX" and the buck power IC "BD70522GUL" have been launched for mobile devices, which are very helpful in extending the battery life of battery-driven applications. This time, the product lineup has added ultra-high-performance buck-boost power ICs to meet the needs of more applications.

1. Achieve high conversion efficiency up to 97% in a wide load current range

By integrating low-loss MOSFETs using a 0.13µm BiCDMOS process for the power system, a high power conversion efficiency of up to 97% is achieved when various battery-driven devices (electric toothbrushes, shavers, etc.) are operating (at a load current of 200mA), and a high conversion efficiency of over 90% is also achieved in other ranges from light load to maximum load (100μA to 1A).

In addition, ROHM's unique control technology "X Ramp PWM control" is used to achieve seamless switching of input voltage up and down.

2. Achieves industry-leading ultra-low current consumption of only 2.8µA in the field of buck-boost power supply ICs

This product uses a low current consumption circuit that combines ultra-low current consumption with high-speed response performance, and optimizes switching control according to the load to reduce losses.

By integrating ROHM's low current consumption analog technology advantages, we have achieved an ultra-low power consumption of 2.8µA in the field of buck-boost power ICs.

*1) DC/DC converter, buck, boost, buck-boost

A type of power supply IC that has the function of converting direct current (DC) voltage into direct current voltage. There are two main types: buck type for lowering voltage and boost type for raising voltage. "Buck-boost" can switch between boost and buck depending on the input voltage, but since the circuit becomes redundant, there are problems in terms of responsiveness and current consumption.