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Buck-boost DC/DC converter achieves breakthrough power savings

ROHM has released a buck-boost DC/DC converter with integrated MOSFET, the BD83070GWL, that combines efficiency with best-in-class current consumption, making it suitable for IoT, wearables, and portable devices.

In response to increased demand for smaller components that can provide the necessary design flexibility and space for integrating new functions while minimising power consumption to maximise battery life, ROHM has developed a power supply IC that meets market needs by leveraging a vertically integrated production system utilising in-house analogue design expertise and specialised power processes.

At the same time, high efficiency ultra-low-power boost (BU33UV7NUX) and buck (BD70522GUL) power supply ICs are available that allow users to significantly extend the operating time of battery-powered applications. With the new BD83070GWL, ROHM expands its offering with a buck-boost IC featuring industry-leading performance.

The BD83070GWL was developed to be the best-in-class product for low power eco-friendly devices used in compact battery-driven applications. The built-in low-DS(on) MOSFET and low control current circuitry achieve an industry-leading power conversion efficiency of 97% during operation (@ 200mA load current) along with class-leading 2.8µA quiescent current consumption. This contributes to longer operating time in compact battery-driven devices, prolonging battery life by as much as 1.53 times when compared to other conventional products during standby (100µA load current).

An evaluation board integrating this converter is also available.

Key Features

In addition to prolonging operating time in battery-driven devices by boosting battery life 1.53 times over conventional solutions during standby (100µA load current), the compact (1.2mmx1.6mm) BD83070GWL provides the following features.

1. Industry-leading 97% efficiency ensures ultra-high efficiency over a broad range of load current

Integrating a low-RDS(on) MOSFET with 0.13µm BiCDMOS power process allows to achieve an the best power conversion efficiency in the industry of 97% during operation (200mA load current) and over 90% efficiency at other light loads (from 100µA) to heavy loads (1A). This enables ultra-high-efficiency power conversion in a wide variety of battery-powered applications. In addition, ROHM’s original control technology (X Ramp PWM Control) enables seamless buck-boost transition.

2. Buck-boost power supply IC achieves ultra-low current consumption (2.8µA)

Combining low current circuit that provides ultra-low current consumption and fast response and an optimized switching control function adapts to different load conditions to reduce loss results in a best-in-class current consumption of 2.8µA.

Application Examples

  • Coin battery equipped sets (i.e. IoT)
  • Li-ion battery devices, including smartphones, tablets, and PCs
  • Battery-driven equipment such as toys and electric toothbrushes

Neil Tyler

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