ISL78234ARZ

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The ISL78234ARZ is a step-up DC-DC switcher specially designed for automotive use. It has an integrated synchronous buck-boost converter, low on-resistance MOSFET, up to 6 detection and current-limit circuits, and a low-dropout linear regulator for precise supply-voltage adjustments. The goal of such integrated solutions is to reduce component count and overall component cost, and to simplify board design by simplifying the layout of related components.

Application Field

The ISL78234ARZ DC-DC switcher can be used in a variety of applications, such as engine starting applications, shutting down whole systems in automotive, automotive infotainment and audio systems, charging system applications. It can also be used in low power start-stop applications. Furthermore, this device is SEPS qualified, making it appropriate for use in automotive electronic control units to supply the microcontroller.

Working Principle

The ISL78234ARZ DC-DC switcher is based on a patented low-shock control topology that combines the features of hysteretic, linear and pulse width modulation (PWM) controllers. The device operates at an input range between 6.5 to 50V, generating an output voltage of up to 4.5V. Additionally, it has undervoltage, overvoltage and over-temperature protection features to protect the MCU.

The ISL78234ARZ DC-DC switcher has a built-in power MOSFET and operates in a synchronous buck-boost topology. It starts up with the lower of the two input voltages (ie. VIN or VOUT) and gradually increases the output voltage as the input voltage rises. Additional regulation is provided by an on-chip low-dropout linear regulator. This helps ensure the output voltage is within an acceptable range even when the input voltage is much higher than the set output voltage.

The device also has several current limit circuits that provide additional protection against short circuits and fault conditions. The current limit can be adjusted with the help of external resistors. A minimum current limit ensures a minimum acceptable load current is maintained during transients, and a slope compensation feature helps maintain stable operation over a wide load range.

The ISL78234ARZ DC-DC switcher also features an internal soft-start circuit that limits inrush current. It has adjustable LDO sequencing, making it easier to coordinate the sequencing of multiple supplies. In addition, it has adjustable turn-on and turn-off delay that can be used to set the startup and shutdown timing.

Overall, the ISL78234ARZ DC-DC switcher is a robust and highly reliable device that is suitable for a variety of automotive applications. Its integrated design helps reduce component count and overall system cost, while its advanced protection features help improve system reliability and safety.

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