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LDOs target MCU power supplies in powertrain systems

Posted: 20 May 2014     Print Version  Bookmark and Share

Keywords:ROHM Semiconductor  powertrain  LDO  MUC  power supplies 

ROHM Semiconductor has developed a 16-model lineup of LDOs optimised for MCU power supplies in automotive body and powertrain systems. According to the company, the BD4xxMx series, together with the BDxxC0A series designed for power supplies in information systems such as car infotainment, bring the total number of automotive-grade LDOs to 43.

The BD4xxMx series achieves less than half the no-load current consumption of standard products, contributing to significant energy savings, ROHM noted. In addition, the circuit design enables support for ceramic capacitors, eliminating the need for electrolytic capacitors for oscillation prevention, reducing both mounting area and costs, stated the company.

BD4xxMx series

The BD4xxMx series is available in a range of form factors, from power packages that support harsh environments to ultra-compact, space-saving types. Additionally, 0.35um BiC-DMOS processes and proprietary analog design technology cultivated over many years are used to achieve an input tolerance of 45V along with automotive-grade reliability. And stable low current operation with load is provided, contributing to improved performance and efficiency.

Also, unlike conventional products, stable voltage output with no output fluctuations or oscillation is possible using just a small (1-10uF) external capacitance. This allows support for compact ceramic capacitors, contributing to increase space savings, indicated the company.

The BD4xxMx series claims to meet the increasingly restrictive energy requirements of today's automotive systems and leverages ROHM's market-tested analog design technology to reduce no-load current consumption by more than half while providing stable low-current operation during loads (along with the BDxxC0A series). The company also said the optimised design ensures stable voltage output with no output voltage fluctuations or oscillations with an external capacitance of only 1-10uF. This eliminates the need for larger external electrolytic capacitors and allows smaller ceramic capacitors to be used, minimising both mounting area and costs. In addition, the LDOs feature a redesigned circuitry that reduces the number of blocks, along with a reconfigured chip layout, making it possible to offer six different package types, from robust power packages that can withstand harsh environments to compact models suitable for high-density applications.

The BD4xxMx series are available for $1.05 (per sample). Delivery is 14 weeks ARO.

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