ROHM LDOs optimized for MCU power supplies
ROHM recently announced the development of a new 16-model lineup of LDOs optimized for MCU power supplies in automotive body and powertrain systems. 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 utilizes state-of-the-art power system 0.35µm BiC-DMOS processes and takes advantage of ROHM’s renowned analog design technology to achieve less than half the no-load current consumption of standard products, contributing to significant energy savings. In addition, novel circuit design enables support for ceramic capacitors, eliminating the need for electrolytic capacitors for oscillation prevention, reducing both mounting area and costs.
In recent years as power supply ICs for automotive applications continue to increase in sophistication and functionality, there comes a greater need for an expanded lineup to cover a wide range of characteristics and application requirements – such as package type and output current – instead of simply focusing on developing an all-in-one solution.
In the automotive sector we are also beginning to see a shift towards parallel purchasing by companies to hedge against risks from natural disasters such as the Great East Japan Earthquake or the flooding in Thailand, as well as increased (global) standardization of commonly used products, which is only expected to accelerate in the future.
In order to quickly respond to these solutions, ROHM offers a broad LDO lineup in various package types and output voltages and currents to suit a range of automotive applications. The BD4xxMx series is available in a range of form factors, from power packages that support harsh environments to ultra-compact, space-saving types, and in different output currents and voltages. ROHM utilized 0.35µm BiC-DMOS processes and takes advantage of proprietary analog design technology cultivated over many years to achieve an input tolerance of 45V along with high reliability to ensure compatibility with automotive applications. Additional features include a no-load current less than half that of conventional products as well as stable low current operation with load, contributing to lower set power consumption.
In addition, unlike conventional products, stable voltage output with no output fluctuations or oscillation is possible using just a small (1-10uF) external capacitance. This allows compact ceramic capacitors to be used, contributing to increase space savings.
Key Features
1．Less than half the current consumption of conventional products
The shift towards greater computerization in vehicles has led to an increase in the number of MCUs required, making it important to minimize power consumption for each power supply IC to improve system energy savings.
The BD4xxMx series leverages ROHM’s market-tested analog design technology to reduce no-load current consumption by more than half while also providing stable low-current operation during loads (along with the BDxxC0A series).
2．Ceramic capacitor compatibility reduces mounting area and costs
Optimized 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, minimizing both mounting area and costs.
3．Multiple package types offered for broad compatibility
Redesigned circuitry that reduces the number of blocks, along with a reconfigured chip layout, make it possible to offer 6 different package types, from robust power packages that can withstand harsh environments to compact models suitable for high-density applications.
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