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February 8, 2021
The R1526 is a 300mA voltage regulator with special features such as a wide operating voltage range and fast transient response. The significant advantage of this product is an outstanding electromagnetic susceptibility (EMS) noise immunity for use in applications that have strict noise requirements intended for consumer, industrial and automotive applications.
Our internal car environment is nowadays equipped with numerous applications using wireless communication, such as:
In addition, the future scheduled connected car systems (Vehicle to Everything) will extensively make use of wireless communication. As a result, the total EMS noise level caused by such systems increases the risk that the proper operation of other on-board systems may be affected by this. It becomes evident to take counter measures in the circuit design to prevent this and select components, which contribute to a reliable operation of the application.
The new R1526 is especially tailored for this purpose and has the capability to resist EMS noise in the high-frequency band from 10 MHz to 1 GHz, providing a stable output voltage. Compared to predecessor generation products the transient response speed has been significantly improved; only minor and short peaks will occur at the output voltage because of input or load transients.
The new CMOS-based R1526 is robust enough to survive in harsh conditions like severe cranking conditions; it operates from 3.5 up to 42 V (Abs. Max. 50 V) and even tolerates load dump surge peak voltages of 60 V with a duration of less than 200 ms.
The output voltage is internally set in a range from 1.8 to 9.0 V and one can select in a 0.1 V step rate. Furthermore, it has an excellent output voltage accuracy of 0.6%, making the product suitable as a power source with high reliability. Three product versions will be available targeted for the consumer, industrial and automotive application market and has specific operating temperature ranges, respectively -40 to 105°C, -50 to 125°C and -40 to 125°C. The automotive version is scheduled to become AEC-Q100 compliant soon.
R1526 has an array of safety features, protecting the voltage regulator and other parts of the application from possible damage and failure.
The R1526 has a stable operation by using a ceramic output capacitor with a minimum value of 10 μF. When the output voltage does not meet the system’s requirements due to input voltage and load current fluctuation, it is recommended to use a ceramic capacitor of 10 μF or larger to minimize the output voltage variation significantly. Refer to below graphs for respectively input and output transient response.
Target applications for this regulator are for example automotive applications with a direct battery connection or for use in ECUs, Infotainment, Security, Dashboard, Remote Keyless Entry, Immobilizer, Gateway systems etc.