Compact design of DC-DC converter ICs from ROHM contributes to the smaller power supply in consumer and commercial equipment by reducing component area by 72%.
ROHM introduces four new miniature DC-DC step-down converter integrated circuits (ICs) that are perfect for industrial and consumer applications, including PLCs, inverters, refrigerators, and washing machines.
Christened BD9E203FP4-Z, is a new 2A buck converter with a 350kHz switching frequency that is part of ROHM’s product selection.
Growing Demand for DC-DC Converter ICs
Compact DC-DC converter integrated circuits (ICs) are becoming more and more popular as a result of the need to reduce board space brought on by growing application functionality in consumer electronics and industrial machinery. Moreover, there is an increasing demand for DC-DC converter integrated circuits (ICs) to provide increased efficiency under light load (low power) circumstances, since lowering standby power consumption is turning into a major difficulty.
In response to these requirements, ROHM created solutions that surpass current SOP-J8 (JEDEC standard: SOIC8 equivalent) devices in terms of efficiency while maintaining an even lower package size.
The New Converter Integrated Circuits Provide:
- Output current ranging from 1A to 3A within the small 2.8mm × 2.9mm TSOT23 package.
- Leads to a 72% reduction in component area when compared to the standard SOP-J8 package (4.9 x 6.0 mm), which aids in the shrinkage of power supply blocks.
No more bond wire resistance. - Adoption of a flip chip in the lead frame TSOT23 package architecture allows for high-efficiency operation.
- During light load operation, the BD9E105FP4-Z, BD9E202FP4-Z, and BD9E304FP4-LBZ also make use of a COT control mode. Because of this, they operate more efficiently under light loads than conventional products, which makes them perfect for applications that need minimal standby power consumption.
In the future, ROHM will keep its attention on creating products that make use of analogue design technologies, assisting in the further miniaturisation and energy efficiency of applications for consumer and industrial equipment. 
TSOT23 Package Product Lineup
Application Examples
3.3V/5V/12V/24V power supply applications
Consumer Appliances:
Refrigerators, washing machines, air conditioners, etc.
Industrial Equipment:
PLCs (Programmable Logic Controllers), inverters, AC servos, etc.
Product Information
Assessment boards and other support tools are available in addition to facilitate prompt assessment during application creation.
Various Support Tools
- Calculation Sheet? A calculation tool for application circuits that facilitates external constant design. By setting values as described, users will be able to determine the circuit parameters that satisfy the desired characteristics.
The sheet is available for download from the ‘Tools’ section on each product page on ROHM’s website.
[BD9E105FP4-Z / BD9E304FP4-LBZ / BD9A201FP4-LBZ]
- ROHM Solution Simulator?A free simulation tool that runs on ROHM’s website. Changing the external constants in the topology described in the datasheet allows the optimal solution for frequency response (for a power supply) to be considered.
[BD9E105FP4-Z / BD9E202FP4-Z / BD9E304FP4-LBZ / BD9A201FP4-LBZ]
Online Distributors: DigiKey, Mouser and Farnell
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