ROHM develops the industry's smallest standby current 6μA automotive LDO regulator
The well-known Japanese semiconductor manufacturer Rom (headquartered in Kyoto, Japan) has developed the "BD7xxL2EFJ-C Series", a vehicle-mounted LDO regulator that achieves a minimum standby current of 6μA and withstands voltages up to 50V.
In the field of automotive LDO regulators (hereinafter referred to as "LDOs for vehicles"), ROHM's development has always been ahead of the industry. This time, through the original circuit design, we successfully developed a product with a standby current that is 80% lower than conventional products. The introduction of this product is very helpful for the car to achieve lower power consumption. This product was sold in May 2012 (sample price: 150 yen), and it was put into mass production on a monthly basis of 200,000 units from September 2012. The pre-production of the production base plan was carried out at ROHM Hamamatsu Co., Ltd. (Shizuoka Prefecture, Japan) and the later process at ROHM Electronics Philippines, Inc. (Philippines).
The standby current is the current consumed when the car is in standby (when the engine is stopped, etc.). In recent years, with the rapid development of electronic electronics, the number of microcontrollers has also increased. As a supply source of microcontrollers, power supplies have become a major issue in power consumption. Specifically, the standby power consumption of the remote controller (remote control door switch) and the safety device, the storage and maintenance of the audio and computer (ECU), and the current consumed by the clock in the engine stop state tend to increase. The increase in battery power consumption during these standbys causes the battery to discharge, so that when the vehicle is stopped for a long time and is not driven for a long time when it is shipped overseas, the battery may be discharged, which may cause the engine to fail to start.
Usually, the current is reduced, and the impedance of the internal circuit needs to be increased. However, this method is not only susceptible to noise, but also has many problems such as miniaturization and slow circuit startup.
This time, ROHM has successfully developed a small, high-reliability low standby current LDO with its in-vehicle LDO technology that has been accumulated for many years and incorporates an exclusive circuit design that is resistant to noise. Compared with the previous products, the standby current is reduced by 80%. Therefore, the battery load can be reduced, and even when the engine is stopped for a long time, a power supply circuit capable of withstanding standby can be constructed.
Further, in various power sources for use in the vehicle, it is possible to realize a reduction in power consumption of the entire vehicle not only when the engine is stopped but also during traveling. From the point of view of energy saving, it is also very helpful to extend the continuous driving distance. In the future, ROHM will continue to promote industry-leading development in the automotive LDO field, and continuously improve its product lineup to contribute to the lower power consumption of automobiles.
　　
1) Ultra-low standby current, the industry's smallest 6μA
The standby current is reduced by 80% compared to previous products. Moreover, even if the load current increases, the new series can maintain a standby current of 6μA, so the standby current can be reduced by 92% at 100mA load.
2) Small package HTSOP-J8 package (6.0mm × 4.9mm H = Max 1.0mm), compared with the previous products, the volume is reduced by about 80%.
3) Built-in overcurrent protection circuit and temperature protection circuit for safe design
4) Output phase compensation can use low ESR ceramic capacitors
In the field of automotive LDO regulators (hereinafter referred to as "LDOs for vehicles"), ROHM's development has always been ahead of the industry. This time, through the original circuit design, we successfully developed a product with a standby current that is 80% lower than conventional products. The introduction of this product is very helpful for the car to achieve lower power consumption. This product was sold in May 2012 (sample price: 150 yen), and it was put into mass production on a monthly basis of 200,000 units from September 2012. The pre-production of the production base plan was carried out at ROHM Hamamatsu Co., Ltd. (Shizuoka Prefecture, Japan) and the later process at ROHM Electronics Philippines, Inc. (Philippines).
The standby current is the current consumed when the car is in standby (when the engine is stopped, etc.). In recent years, with the rapid development of electronic electronics, the number of microcontrollers has also increased. As a supply source of microcontrollers, power supplies have become a major issue in power consumption. Specifically, the standby power consumption of the remote controller (remote control door switch) and the safety device, the storage and maintenance of the audio and computer (ECU), and the current consumed by the clock in the engine stop state tend to increase. The increase in battery power consumption during these standbys causes the battery to discharge, so that when the vehicle is stopped for a long time and is not driven for a long time when it is shipped overseas, the battery may be discharged, which may cause the engine to fail to start.
Usually, the current is reduced, and the impedance of the internal circuit needs to be increased. However, this method is not only susceptible to noise, but also has many problems such as miniaturization and slow circuit startup.
This time, ROHM has successfully developed a small, high-reliability low standby current LDO with its in-vehicle LDO technology that has been accumulated for many years and incorporates an exclusive circuit design that is resistant to noise. Compared with the previous products, the standby current is reduced by 80%. Therefore, the battery load can be reduced, and even when the engine is stopped for a long time, a power supply circuit capable of withstanding standby can be constructed.
Further, in various power sources for use in the vehicle, it is possible to realize a reduction in power consumption of the entire vehicle not only when the engine is stopped but also during traveling. From the point of view of energy saving, it is also very helpful to extend the continuous driving distance. In the future, ROHM will continue to promote industry-leading development in the automotive LDO field, and continuously improve its product lineup to contribute to the lower power consumption of automobiles.
　　
1) Ultra-low standby current, the industry's smallest 6μA
The standby current is reduced by 80% compared to previous products. Moreover, even if the load current increases, the new series can maintain a standby current of 6μA, so the standby current can be reduced by 92% at 100mA load.
2) Small package HTSOP-J8 package (6.0mm × 4.9mm H = Max 1.0mm), compared with the previous products, the volume is reduced by about 80%.
3) Built-in overcurrent protection circuit and temperature protection circuit for safe design
4) Output phase compensation can use low ESR ceramic capacitors
| model | The output voltage (V) | Output voltage accuracy (%) | Output current (A) | Minimum output input Voltage difference :Io=200mA(V) | Withstand voltage (V) | Circuit current ( μ A) | Operating temperature ( °C ) | Package | RoHS correspond |
| BD733L2EFJ - C | 3.3 | ±2 (Ta-40～+125°C) | 0.2 | 0.6 | 50 | 6 | -40～+125 | HTSOP-J8 | Yes |
| BD750L2EFJ - C | 5 | ±2 (Ta-40～+125°C) | 0.2 | 0.4 | 50 | 6 | -40～+125 | HTSOP-J8 | Yes |
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