LM22678QTJ-ADJ/NOPB

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The LM22678QTJ-ADJ/NOPB is a DC-DC switching voltage regulator specifically designed for use in applications requiring high efficiency, small size, and excellent thermal performance. This regulator can provide up to 1.5A of continuous current output and is suitable for a wide range of input and output voltage ranges. This regulator is also capable of meeting applications that require output currents up to 8A when using a step-down configuration.

In the field of PMIC—Voltage Regulators—DC DC Switching Regulators, the LM22678QTJ-ADJ/NOPB is a high-efficiency buck switching regulator designed to provide an adjustable regulated output voltage from an input voltage of up to 40V. The regulator is designed to prevent output overvoltage regardless of input voltage or load conditions. The output voltage is adjustable from 1.2V to 40V by externally setting the feedback voltage. The feedback reference is taken from an adjustable resistor divider mounted on the board to the regulator.

The LM22678QTJ-ADJ/NOPB regulator offers excellent efficiency and is ideal for a wide range of battery-powered systems. It operates at low frequencies of up to 600kHz, and features a single-cycle current-limit capability that allows the design of power supplies with high power-density performance. The regulator\'s low-noise switching also makes it compatible with low-noise PC applications.

In terms of its working principle, the LM22678QTJ-ADJ/NOPB is a high-efficiency buck switching regulator. The switching regulator consists of a main power MOSFET (Q1) and synchronous rectifier (Q2) connected in a buck configuration, operating at a fixed switching frequency. The switching frequency can be programmed by external resistor (RSET) connected to RT/SYNC pin. The input voltage is connected to the cathode (or source) of Q1 and the output voltage is taken from the source of Q2.

When the converter is enabled, Q1 conducts and the current starts to flow through the inductor. The current flow in the inductor increases until the current through the inductor reaches the programmed value (IFSENSE) or the maximum current limit is reached (ILIMIT), whichever comes first. When this value is reached, the MOSFET is turned off and the current ramps down exponentially in the inductor (discharge time). This inductor end constitutes the positive half of the power supply output.

When the current in the inductor reaches zero, the current starts to flow in the reverse direction and the output voltage rises until the feedback voltage is reached. At this point, the synchronous rectifier (Q2) is turned on, allowing the current to continue flowing to the output. When the current limit is reached, Q1 is turned on again, allowing the inductor current to increase and the current through Q2 to decrease. This process is repeated at a constant frequency determined by the value of the external resistor RSET.

In short, the LM22678QTJ-ADJ/NOPB is a high-efficiency buck switching regulator designed for use in applications that require high efficiency, small size and excellent thermal performance. The regulator offers adjustable output voltage from 1.2V to 40V and can provide up to 1.5A of continuous current output. It is suitable for a wide range of input and output voltage ranges and features a single-cycle current-limit capability that allows the design of power supplies with high power-density performance. The regulator operates at low frequencies of up to 600kHz and its low-noise switching makes it compatible with low-noise PC applications.

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