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42 V Voltage Regulator with fast transient response and High EMS Noise Immunity

February 8, 2021

  • R1526 banner

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.

EMS Noise Immunity:

Our internal car environment is nowadays equipped with numerous applications using wireless communication, such as:

  • Aftermarket accessories : Bluetooth, NFC and WiFi communication
  • ADAS car safety systems : Adaptive Cruise Control, Collision Avoidance System, Tire Pressure Monitoring, Keyless Entry
  • R1526 Noise Immunity Test
  • 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.

Wide Operating Voltage Range:

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.

Protection Circuits:

R1526 has an array of safety features, protecting the voltage regulator and other parts of the application from possible damage and failure.

  • Over-current protection, limiting the output current when overloaded.
  • Short protection, an embedded fold-back short current limit circuit detects a short circuit and decreases the output current to a safe level of 100 mA. After removing the short the regulator resumes to normal operation automatically.
  • Protected pin layout, the HSOP-8E package has a special pin layout arrangement preventing a failure when adjacent pins are shorted; all four regulator terminals are isolated with unconnected adjacent pins.
  • Thermal protection is incorporated and will turn off the regulator when an over-temperature of 160°C is detected and will resume to normal operation again as soon a temperature of 135°C is reached.

Transient Response:

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.

  • Input Transient Response

    Input Transient Response
  • Output Transient Response

    Output Transient Response

To be used in

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.

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