L4957AD3.3

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The L4957AD3.3 is a monolithic integrated circuit featuring an adjustable low-drop voltage regulator which is specifically designed to supply microprocessors. Operating as a 3.3 Volt voltage regulator, the L4957AD3.3 is designed to provide an accurate and well-defined output voltage within temperature ranges from -40 °C to +85 °C. This voltage regulator requires two external resistors to set the output voltage. The device provides low dropout operation and high ripple rejection for environments where output-voltage stability is desired. Due to its low current consumption and high input voltage, the device is particularly useful for high-efficiency step-down applications. Furthermore, the device can operate from an input voltage source as high as 40 V.

The L4957AD3.3 belongs to PMIC (Power Management Integrated Circuit) and more precisely is positioned in the Voltage Regulators Linear category. PMICs are integrated circuits that control the usage, flow, and conversion of power within electronics devices. In particular, the linear voltage regulator is used in power applications that require power to be maintained at a constant level. These regulators produce a constant output voltage, no matter how the input voltage varies. As a result of this, a large number of power-handling devices, including computers, tablets, telephones, and other embedded systems, are powered using linear voltage regulators.

The L4957AD3.3 device is supplied in a 10-pin plastic package, making it an extremely space-saving and cost-efficient solution for applications. It employs an adjustable, low-dropout voltage regulator that allows the voltage output to be precisely regulated with a two-resistor voltage divider. The device is intended to be used as a step-down (buck) converter. Thanks to a wide operating temperature range, the L4957AD3.3 can operate in environments where a high degree of stability and accuracy of voltage output is required.

The nominal output current for the device is 0.8 A, with a maximum peak current of 1.6 A. Additionally, the L4957AD3.3 is protected against over-voltage and thermal overloads, and is provided with an internal current limit to protect against short circuits. The device, which offers wide input voltage operation from 6.5 V up to 40 V, can be reprogrammed through a two-resistor voltage divider connected to between the OUT and ADJ pins of the device. Furthermore, the input-to-output voltage differential (Dropout voltage) is typically 1.25 V.

The L4957AD3.3 voltage regulator is suitable for interfacing between a DC/DC converter and a microprocessor, as well as other applications that require a well-defined, stable output voltage level, such as signal conditioning, power supply regulation, and voltage-level shifting. Its narrow operating temperature range ensures that this device can operate even under severe conditions, thus making it an ideal choice for embedded systems such as consumer and industrial-grade electronics.

In conclusion, the L4957AD3.3 is a monolithic linear voltage regulator which offers superior performance when dealing with voltage regulation requirements. Its high stability, accuracy and low dropout voltage make it an optimal choice for a wide range of applications, ranging from consumer grade to industrial electronics. Thanks to its narrow operating temperature range and its high input voltage operation, the L4957AD3.3 is ideal for environments such as DC/DC converters and microprocessors, where a high degree of precision and voltage stability is needed.

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