E-L4957AD1.5

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Voltage regulators are electronic circuits that can provide a constant voltage across a load, even in the face of varying current demands and input voltages. This is extremely useful in many applications, since it ensures that critical electrical systems are not damaged by sudden changes in power or voltage. The E-L4957AD1.5 is a linear voltage regulator, which provides an output voltage that is always equal to its input voltage minus a certain drop-out voltage. It is a highly efficient, low-power device, with a low quiescent current and a wide operating voltage range of 1.5 V to 5.5 V. Its main applications lie in the fields of power management, powering low-voltage devices from a higher-voltage supply, and providing an extra layer of protection for sensitive devices.

Features of E-L4957AD1.5

The E-L4957AD1.5 is a step-down voltage regulator which can provide an adjustable output voltage ranging from 1.0 V up to 6.0 V, by adjusting the value of the external feedback resistor. It is considered a low-power device, with a quiescent current of only 8 µA. It is designed to provide an output current up to 1A and a fast line/load transient response. Its maximum operating temperature is rated to be 175°C.

The Working Principle of E-L4957AD1.5

The E-L4957AD1.5 uses a three-pin configuration. The input voltage is applied to the “Input” pin, and the output voltage is delivered at the “Output” pin. The third pin is connected to the adjustable “Reference” voltage, which determines the output voltage of the device. This voltage is derived from an internal voltage reference, whose value is set by the external feedback resistor. When the output voltage reaches the reference voltage, the regulator will stop allowing the flow of current, thus maintaining the output voltage at the specified level.

The internal transistor within the device acts as a switch, controlling the current flow. When the input voltage is greater than the output voltage (plus the drop-out voltage, which is typically 0.2 - 0.5V), then the transistor will be open, allowing current to flow from the input to the output. As the output voltage approaches the reference voltage, the transistor will drop into cutoff, denying any further current flow.

Application Fields of E-L4957AD1.5

The E-L4957AD1.5 is well suited for numerous portable, low-power applications, due to its low quiescent current and its ability to maintain a constant output voltage in the face of varying input and load conditions. In this way, it can provide an extra layer of protection, shielding sensitive electronics from unforeseen changes in supply voltage. Common applications include battery-powered devices, embedded systems, and LED drivers. For these types of applications, the E-L4957AD1.5 should provide robust and reliable performance.

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