LT3689EUD#PBF

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The LT3689EUD#PBF belongs to the range of DC DC switching regulators available in PMIC. It converts varying input voltage levels into a regulated output voltage with high efficiency. The device includes configurable input/output features, adjustable soft-start, high current switches, and ideal diode rectification. The LT3689EUD#PBF is designed for applications such as high-end notebook and desktop computers, server and communication systems, and any other system with an intermediate stage power management layer and strict energy efficiency requirements, such as automotive industry and industrial equipments.

The LT3689EUD#PBF features a wide input voltage range from 4.5V to 17V and up to 96% efficiency. It operates with a switching frequency up to 4.5MHz, allowing the use of small components, and offers a maximum output current of 2A.

The device includes several integrated protection circuits, thermal shutdown, and overcurrent protection, which allows it to perform with high reliability. On the other hand, it also includes configurable input and output features such as HDMI compatible input/output, adjustable voltage control range, and adjustable soft-start.

Working Principle

The LT3689EUD#PBF uses pulse width modulation (PWM) to rapidly switch the output to provide the required output voltage. The regulation of the output voltage is accomplished by adjusting the on-time of the switching cycle. This is done by comparing the feedback voltage from the output voltage and an internal reference voltage.

The device has two main components, a main switching transistor and a commutating diode, which are driven through two dedicated control pins, PWMH and PWML. As the PWM is used to control the switching frequency, the higher the PWM frequency, the better the load response of the converter and thus the better the regulated output voltage.

The internal comparator detects any deviations between the output voltage and the internal reference voltage and adjusts the PWM duty cycle accordingly. When the voltage deviation is higher than the set threshold, the PWM duty cycle will be increased to make the output voltage lower. Conversely, when the voltage deviation is below the set threshold, the PWM duty cycle will be reduced to make the output voltage higher.

The LT3689EUD#PBF also features an adjustable current limit, which is used to protect the system from overcurrent events. When the output current reaches the preset current limit, the device will reduce its switching frequency to limit the output current.

In addition to these features, the device also includes an adjustable soft-start feature, which can be used to gradually increase the output voltage in order to reduce stress on the system during turn-on events. It also includes a built-in thermal shutdown circuit, which is used to protect the device from high temperature events.

The LT3689EUD#PBF is capable of delivering high efficiency with improved current capability in high-end computers, servers, and communication systems. It can be used to provide an intermediate stage power management layer with strict energy efficiency requirements in systems such as automotive and industrial equipments.

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