Synchronous Buck DC/DC Converter IC Featuring the Industry's Lowest Minimum ON-Time

KYOTO, TOKYO and SANTA CLARA, CA--(Marketwired - March 17, 2016) - ROHM has recently announced the development of the BD51180TL, a step-down DC/DC converter featuring the lowest minimum ON time in the industry, making it ideal for high-power applications such as industrial equipment and automotive systems.

In recent years, there is a growing trend towards electronification to meet the need to conserve energy in all areas, including the automotive market where attention has focused on 48V hybrid vehicle systems that take safety into account and provide better fuel economy than conventional 12V systems. This is expected to increase the demand for DC/DC converters that can not only provide direct 3-5V output from 48V for driving control blocks and various functions, but are also capable of operating at high frequency ( > 2MHz) to prevent interference with AM radio bands and minimize the number of external components. To meet these market needs for high input, low output, and high switching frequency it is necessary to shorten the switching ON time.

Proprietary technology for controlling pulses in a very short time allowed ROHM to reduce the minimum ON time to an unprecedented 20ns -- 6x shorter than conventional solutions -- enabling stable step-down operation from 48V to 3.3V at a constant switching frequency of 2MHz. In addition, current mode control provides easy phase compensation required for constant voltage output with fewer external parts, contributing to greater end-product miniaturization while reducing customer design load. And integrating ROHM's high voltage MOSFET expands the input voltage range to 65V, 4.6x higher than conventional products, ensuring compatibility with a wider range of applications. Additional features include multiple protection circuits and AEC-Q100 qualification that support the stringent reliability demands in the automotive and industrial equipment sectors.

ROHM will be exhibiting this breakthrough technology at APEC 2016, the premiere event in applied power electronics (for more information, click here).

APEC 2016

Dates: March 20-24, 2016

Location: The Long Beach Convention & Entertainment Center, Long Beach, CA

Booth number: 1843

About: APEC (Applied Power Electronics Conference) focuses on the practical and applied aspects of the power electronics business.

Availability: Samples (Winter 2016)

Key Features

1. Breakthrough 20ns minimum ON-time control
Leveraging original technology for controlling pulses in a very short period makes it possible to reduce the minimum ON time to an unprecedented 20ns, 6x shorter than the conventional level. This ensures stable 3.3V output from 48V battery systems for driving various functions and control blocks while enabling 2MHz operation that prevents interference with AM radio band frequencies.

2. Easy phase compensation with current mode control
Switching power supplies such as DC/DC converters typically include a feedback control circuit along with phase compensation to prevent abnormal oscillation. 

ROHM's new IC employs current mode control capable of controlling the current in very short pulse widths, simplifying phase compensation while reducing customer design load. Plus, only two components are required to achieve stable operation over a wide input voltage range.

3. Expanded input voltage range
Integrating ROHM's high voltage MOSFET makes it possible to expand the input voltage range by over 4.6x compared with conventional products, from 12V to 65V, enabling suitability for a wider range of applications -- including high-voltage automotive systems and industrial equipment.

4. Compact high-heat dissipation package
Generally, increasing the breakdown voltage requires greater heat dissipation, making it difficult to decrease size. In contrast, the VQFN24SV4040 adopts a backside heat sink that reduces size to a compact 4.0x4.0x1.0mm, 54% smaller than conventional products,.

5. Multiple protection circuits
Standard protection circuits are built in to ensure safe operation and provide a greater degree of reliability.

  • AEC-Q100 Qualified
  • Over Current Protection
  • Input Under Voltage Lockout Protection
  • Input Over Voltage Protection
  • Output Overvoltage Protection
  • Thermal Shutdown
  • Short-Circuit Protection

About ROHM Semiconductor
ROHM Semiconductor is an industry leader in system LSI, discrete components and module products, utilizing the latest in semiconductor technology. ROHM's proprietary production system, which includes some of the most advanced automation technology, is a major factor in keeping it at the forefront of the electronic component manufacturing industry. In addition to its development of electronic components, ROHM has also developed its own production system so that it can focus on specific aspects of customized product development. ROHM employs highly skilled engineers with expertise in all aspects of design, development and production. This allows ROHM the flexibility to take on a wide range of applications and projects and the capability to serve valuable clients in the automotive, telecommunication and computer sectors, as well as consumer OEMs.

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Jayme Pontious 
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