LT3430IFE#TRPBF

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The LT3430IFE#TRPBF is a synchronous high-current DC/DC buck regulator. It is able to provide up to 32 A of output current for wide input voltage range applications. Specifically designed for battery-powered and energy harvesting systems, the LT3430IFE#TRPBF supports multiple low-power modes for improved efficiency in light-load operation. It features an adjustable switching frequency from 100 kHz to 2 MHz, allowing design of power supplies with very small external components and high efficiency over a wide load range.

Application Field

The LT3430IFE#TRPBF can be used in a wide variety of applications, including consumer electronics, portable systems, wearable devices, automotive, industrial, and medical. It is mainly employed in single-cell Li-ion battery-powered applications, such as notebook computers, tablets, portable media players, and smart phones. As it is able to operate over a wide range of input voltages, it can also be used in automotive, industrial, and medical equipment.

Working Principle

The LT3430IFE#TRPBF is a synchronous current-mode step-down switching regulator. It employs an internal high-side MOSFET and an N-channel synchronous MOSFET to provide high-efficiency performance over a wide range of loads. The efficiency is further improved with the use of a low-loss current source instead of a more common current-mode comparator. The switch node is actively clamped during each cycle, which allows the switching frequency to remain constant and fixed at a value set by the user. In light-load conditions, the device enters low power mode and automatically reduces switching frequency for improved efficiency.

The LT3430IFE#TRPBF also offers an adjustable soft-start feature that sets the switch-ON time and prevents the inrush current during startup. The device also provides over-temperature protection and over-voltage protection, ensuring reliable operation even in the harshest conditions. Additionally, a true shutdown feature allows the user to disconnect the load from the input supply via the dedicated enable pin.

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