MAX14949EWE+T

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Digital Isolators is widely used in the industry because of its great performance in electrical safety and EMC property. Among these digital isolators, the MAX14949EWE+T is a particularly attractive choice. It is an electronic switch composed of two insulated conductors which can exchange signals but remain separated. Its applications and working principles will be explored in this article.

Application Field

MAX14949EWE+T is especially suitable for automotive industry. It supports common protocols, such as LIN, J2602, and CAN FD. It has a low max RON of 330 mΩ, rated current of 8 A, and fully ISO 10605 compliant. Therefore, it enables high current and data communications across multiple systems with high system integrity. Moreover, it is robust in extreme temperatures ranging from -40 °C to +125 °C.

The device is also suitable for home appliance and healthcare industries. It is designed with supply flexibility, having both 3 V and 5 V supplies as well as supporting the two supply-rail input voltage domains. It has integrated transient and ESD protection in its fields, which are often required in these industries. Moreover, due to the light package size of just 3.5 mm x 3.0 mm, it offers high system efficiency in size-constraint application.

Working Principles

Essentially, the device provides galvanic isolation between the high-voltage and low-voltage network. It consists of a transmitter and a receiver, which are separated by an insulation barrier. The information transmission is done by sensing the ground level voltage difference, which the device must detect accurately in order to identify the presence or absence of information.

The normally isolated switching junction is formed by the junction of two bidirectional thyristors and the diode diode. These two components will help regulate the current to the necessary level so that an appropriate voltage can be produced and transmitted across the barrier. As soon as a voltage difference appears, the device will detect it and transfer it into a signal.

When the input signal is falling, the device will start turning on the high-side thyristor and turn-off the low-side thyristor. This creates a voltage-controlled resistor between ground and the voltage output side of the device. As soon as the current reaches the predetermined value, the circuit will be turned off. This integrated solution allows a high degree of isolation, which minimizes electromagnetic interference.

MAX14949EWE+T is designed with low-emission and low-immunity profiles. Its design is certified to pass numerous industry specific emissions and immunity tests like CISPR 25 or ISO 11452. This ensures conformance to the highest safety standards while meeting the requisite EMC requirements.

Conclusion

In summary, MAX14949EWE+T is a very versatile digital isolator with excellent performance in various applications. Its low RON and high current capabilities makes it a great choice for automotive, home appliance, and healthcare industries. Its insulated conductors ensure maximum safety and reliable data transmission in all operating conditions. Furthermore, it offers excellent time-domain and frequency-domain EMC characteristics, making it a smart choice for protecting critical systems against EMI.

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