LTM8028MPY

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DC-DC converters, which are used to convert a fixed DC voltage into a variable DC voltage, can provide a great source of power in many applications with various levels of voltage. The power module, LTM8028MPY from Linear Technology, is a members of the DC-DC converters family that offers a high level of efficient, robust and reliable power conversion. This article aims to examine the application field and working principle of the LTM8028MPY.

The LTM8028MPY is a buck converter optimized for a wide 4.75V to 36V input voltage range and provides output voltage setting resolution from 1.2V to 32V and adjustable output current up to 8A. It is pre-programmed with one-time programmable nonvolatile memory, which allows the part to provide current mode step-down DC-DC conversion. The on-board 60mΩ integrated power switches provide a high efficiency power conversion up to 96.4% and input quiescent current is only 1µA. The LTM8028MPY regulator is also designed with a robust features such as soft-start, voltage monitor, thermal shutdown for improved system reliability.

The LTM8028MPY is suited for applications in a variety of electronic systems where a reliable and efficient power source is required, such as for powering FPGAs, MCUs, memory controllers, Ethernet switches, battery-powered portable systems and automotive systems. The adjustable output current feature also enables applications where precise current control is needed, such as in some light emitting diode (LED), testing, metering or fan speed control.

The device’s buck converter topology is based on an inductor-capacitor (LC) filter, which is used to reduce ripple in the output voltage. It has an internal non-inverting power amplifier stage, which is used to modulate the voltage of the small signal duty cycle control input. The duty cycle of the signal is set with a voltage across the feedback pins FB and FBB to have the desired output current.

The feedback loop is used to regulate the output voltage. It is an open-loop system where the output voltage is obtained by comparing an input signal with a reference voltage. When the output voltage reaches the desired value, the feedback signal is sent to the internal power amplifier to control the duty cycle of the PWM signal. During the power stage, the inductor core will store energy in the form of magnetic flux when current flows into it, then this energy is released as current to the load when the current flow reverses.

In addition, the LTM8028MPY has built-in integration to sense the input voltage and current, as well as a thermal shutdown circuit which is used to monitor and reduce thermal strain. The internal overcurrent protection is used to detect and limit short-circuit and overload current. With its high power efficiency and adjustable output voltage and current, the LTM8028MPY is a versatile and reliable solution to provide power to a wide range of applications.

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