LTC3459ES6#TRMPBF

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The LTC3459ES6#TRMPBF is a high performance synchronous buck switching regulator designed for both step-up and step-down applications. It features a constant frequency, peak-current-mode architecture, which allows for accurate regulation of output voltage. With an input voltage range from 2.75V to 5.5V, it can provide an output voltage from 0.6V to 4.0V, with an adjustable switching frequency up to 1.5MHz and a 100% duty cycle in the step-up mode.

It includes internal compensation, current and thermal protection, input under-voltage lockout, and output over-voltage protection. The linear regulator provides very good line and load regulations, making it ideal for low noise, high power applications. It is housed in a space saving, 6-pin TSOT-23 package, making it suitable for use in many space-constrained applications.

Application Field

The LTC3459ES6#TRMPBF is ideal for use in a wide range of applications, especially those that require low noise, high power, and high efficiency. It can be used for powering motherboards, notebooks, and other portable electronics, such as cell phones, tablet computers, and digital cameras. It can also be used in power supplies for lighting and automobiles, as well as for powering audio amplifiers and medical equipment.

Working Principle

The LTC3459ES6#TRMPBF works on the principle of peak-current-mode switching. In this mode, the internal voltage is set to a certain value that is proportional to the load current. This voltage acts as a reference voltage and is compared to the feedback voltage, which is set by the output voltage of the converter. When the internal voltage is higher than the feedback voltage, a switching MOSFET is turned on, and the current in the inductor starts increasing. When the internal voltage is lower than the feedback voltage, the MOSFET is turned off, and the inductor current starts decreasing.

When the inductor current reaches a predetermined peak current, a loop iteration is triggered, and the internal voltage is adjusted accordingly. The switching frequency is kept constant during stable operation and is determined by the resistors and capacitors in the circuit. The switching frequency can also be varied if required, by changing the components in the circuit, or by overriding the default setting with an external signal.

The LTC3459ES6#TRMPBF features a wide range of features and protections, such as over-current protection, over-voltage protection, input under-voltage lockout, and thermal protection. It also provides some additional features, such as programmable soft-start, a high frequency enable control pin, and an overload signal output.

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