LP2956IMX

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LP2956IMX is a linear voltage regulator from Texas Instruments. It is part of the wide family of Regulators, which includes parts from the low-dropout (LDO) regulator range. This voltage regulator is a simple, low-cost device that provides excellent line/load regulation and can provide up to 1A output current. The LP2956IMX is an adjustable output type, and its output voltage can be set using external voltage dividers, which enables the use of a wide power supply range.

This part can operate over a broad operating temperature range of -40ºC to +125ºC and is protected against over voltage, current and temperature. Protection features include current foldback, thermal shutdown and an active clamp output over voltage shutdown. The device enables a good margin of operation with a typical dropout voltage of 150mV at 1A of output current.

The output voltage range on the LP2956IMX for the adjustable version is 0.825V to 7.2V. This allows the device to power numerous applications, such as FPGAs, microcontrollers, ASICs, memory and gate arrays and is also suitable for automotive applications. Due to its low power dissipation, the device is well-suited for battery-powered applications where power saving and thermal management are important.

The main components of the LP2956IMX, which allows it to regulate voltage and current, is a voltage reference, an error amplifier, an output buffer and a pass transistor. The output buffer amplifier is a common emitter stage that utilizes a PNP transistor and a resistive divider for the positive output voltage. When the pass transistor is turned on, the error amplifier amplifies the difference between the feedback voltage of the regulator and the reference voltage, producing a current flow from the output voltage to the supply voltage.

The reverse current protection is provided by the pass transistor, which is connected in the reverse direction of the power source. When the current passes through the drain, the voltage at its source decreases, causing the pass transistor to cut off the current. This avoids the excessive current from passing through the power source, protecting it from damage.

The LP2956IMX offers many features like a low dropout voltage of 150 mV at 1A, fast response time of 12 μs and output voltage range of 0.825V to 7.2V. Its high level of protection and excellent line/load regulation make it suitable for many applications. Due to its wide temperature range, it can be used in automotive applications. This device is the perfect choice for many low-voltage, low-power applications.

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