Switching Regulator. The LM series of regulators are monolithic integrated circuits. All circuits of this series are. These devices are available in fixed output voltages of 3.

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This pin is provided with the feedback voltage based on which the output is regulated. The LM is a voltage Regulator IC , it uses the Buck-converter topology to step-down and regulate higher level voltage values to lower level. There are also fixed output voltage type and variable output voltage type of Converters available with the same IC. So if you are looking for a switching step-down regulator with these characteristics to regulate a voltage for your circuit then this IC might be of interest to you.

Using the LM is very easy; it requires only 6 additional components including an inductor which is placed in series with the output. The value of the inductor can range from 47uH to uH based on the output required. A typical application circuit for LM is show below.

Since this is a switching circuit electrostatic interference should be kept in mind while designing the PCB of placing the components on a perf board. The circuit also deals with high current and hence a suitable high voltage di-electric capacitor with low ESR equivalent series resistance should be chosen. Also a high current will be passing through the indictor and hence the coil should be of high gauge to allow the current to pass through it.

Using a wrong value or low wattage inductor might damage the IC permanently. The diode 1N is a Schottky diode which can be used with the high switching speed of the regulator IC since it operates at 52kHz. Also the voltage drop across the diode is less and can allow high current to pass through it. Again since we are dealing with step-down switching circuit there will high power dissipation and the use of heat sink for the LM is mostly mandatory.

Subscribe to stay updated with industry's latest Electronics components and news. LM Regulator features and specifications Switch mode step down voltage regulator Output Voltage for fixed voltage regulator: 3.

How to use LM IC? Applications Used in battery circuits since they have high efficiency Step-down Linear regulators Used in small SMPS circuits Can also be used to source negative voltage. Component Datasheet. LM Datasheet. Tags Buck Converter. Get Our Weekly Newsletter!


National Semiconductor

The LM series of monolithic integrated circuits provide all the active functions for a step-down buck switching regulator. Fixed versions are available with a 3. Adjustable versions have an output voltage range from 1. Both versions are capable of driving a 3A load with excellent line and load regulation. These regulators are simple to use because they require a minimum number of external components and include internal frequency compensation and a fixed-frequency oscillator.


LM2576 Datasheet PDF

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