LT3970IDDB-3.3#TRMPBF

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The LT3970IDDB-3.3#TRMPBF is a DC-DC Switching Regulator. It is a robust, high efficiency, current-mode switching regulator, ideally suited for many applications such as automotive, battery powered systems, LED lighting and general purpose DC-DC conversion. It has a wide input voltage range of 4.5V to 36V, capable of delivering up to 2.5A of continuous output current. The LT3970IDDB-3.3#TRMPBF features a pulse-width modulation (PWM) current-mode control, allowing for a wide variety of loop gain compensation options. The adjustable frequency oscillator, adjustable soft-start and external synchronisation features enable high efficiency operation over a wide range of system configurations, and it also features a single resistor enable/disable control.

The LT3970IDDB-3.3#TRMPBF is a single-channel non-synchronous buck regulator, providing a high efficiency, low output voltage ripple and fast transient response. The tight output voltage accuracy (±1.5%) is maintained with the built-in over-voltage, over-current and short-circuit protections. The LT3970IDDB-3.3#TRMPBF provides an adjustable soft-start to ensure adjustable start times, while the adjustable frequency oscillator enables the user to adjust the switching frequency to maximize efficiency. The high conversion efficiency of up to 96% ensures that the power dissipation of the controller is kept to a minimum.

The working principle of the LT3970IDDB-3.3#TRMPBF is based on a fixed frequency current mode control. It uses an external resistor to sense the output current, allowing for accurate current-mode control. The voltage feedback loop uses an error amplifier and dual-output shunt resistors, providing the flexibility to compensate across the entire input voltage range. The LT3970IDDB-3.3#TRMPBF can be adapted to different control voltage requirements by connecting the VSENSE pin to the desired voltage. The switching frequency is also adjustable, allowing for optimum efficiency for a wide range of load conditions.

The LT3970IDDB-3.3#TRMPBF is suitable for a wide range of applications, particularly automotive and battery powered systems. It is also suitable for LED lighting and general purpose DC-DC conversion. Key applications include motor and generator control, telecom base stations and other battery-powered systems. This controller provides high efficiency, low output voltage ripple and fast transient response, making it an ideal choice for a variety of applications. The addition of adjustable soft-start, over-voltage, over-current and short-circuit protections open up a range of possibilities for designers.

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