MC33389CDH

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The MC33389CDH is a step-down DC-DC converter from NXP Semiconductors that offers both the functionality of Power-Fail and Wake-Up functionality with just one device. It is rated for an input voltage range of 4.5V to 17V and an output voltage of 1.8V to 5.5V. The device also has a shutdown mode and power-fail detection to provide better system performance. It also features overcurrent, overvoltage, and thermal protection. The device features a reduced external component count, allowing smaller, more efficient designs.

This device is specialized for use in automotive applications, such as powertrain systems, head lamps, power steering, and other automotive functions. It is also applicable in other non-automotive applications, such as security systems, medical applications, off-grid solar systems, etc. The device can be used to provide an efficient, controlled supply of power for a wide variety of uses.

The MC33389CDH is based on a buck-switching regulator topology. It utilizes a voltage-mode control method, where the output voltage is measured by an internal feedback circuit and compared to a reference voltage. The error signal is then sent to the control block which adjusts the duty cycle of the output power switch. This enables the output voltage to be regulated with high precision, even in cases where the input voltage and/or load current changes are rapid. The device also provides a low quiescent current and fast transient response.

The MC33389CDH also includes an Undervoltage Lockout (UVLO) circuit. This prevents the device from supplying power until the supply voltage is above the threshold voltage, thus protecting the device from operating at too low of a voltage. It includes an overcurrent protection (OCP) circuit as well, in order to protect the device from overheating.

The MC33389CDH provides a wide input voltage range, low quiescent current, good efficiency, and fast transient response, making it an ideal device for applications where high power efficiency and reliability are required. The device also provides a power-fail and wake-up functionality in a single device, allowing designers to save on space and cost. Additionally, the device features overcurrent, overvoltage, and thermal protection, which adds an extra layer of safety.

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