LT3091MPFE#PBF

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The LT3091MPFE#PBF is a voltage regulator which is part of the linear positive voltage regulator regulators of the PMIC – Voltage Regulators – Linear category. The LT3091 is a low-noise, adjustable, low-dropout (LDO) linear regulator, designed to operate with a supply voltage from 1.8 V to 15 V. The LT3091 supports up to 1.5 A of output current, with a fast transient response and a typical dropout voltage of 170 mV at 500 mA.

The voltage regulator features a wide operating temperature range of –40 to +125°C, making it suitable for automotive, medical and industrial applications which require high-temperature operation and low noise performance. It also offers an output voltage tolerance of ±2.2%, and a current limit foldback that permits a maximum peak input current of up to 2 A.

The LT3091MPFE#PBF is ideal for applications with high-dynamic requirements, and also offers a “power-good” indicator which requires minimal microcontroller overhead. The “power-good” indicator alerts the user when the output voltage falls below a user-selectable voltage threshold, and can be used to perform an additional function for a microcontroller or other system-level management IC.

The LT3091MPFE#PBF voltage regulator also features an enable pin and a shutdown pin, which can be used to provide additional control options. The enable pin can be used to enable or disable the regulator, while the shutdown pin allows for a low-power standby or shutdown mode.

The working principle of the LT3091MPFE#PBF voltage regulator is based on a standard NPN bipolar transistor, combined with current sources and resistors. The NPN transistor acts as a variable resistor which is used to control the output voltage.

The voltage regulator is provided with two inputs, the input voltage (Vin) and the output voltage (Vout). The input voltage is stepped down through a series of resistors, which are connected to the NPN transistor. A network of current sources and resistors control the overall impedance of the transistor, and adjust its output voltage.

When the output voltage is required to exceed the input voltage, the transistor is biased to ensure that the current flow is greater than the load current. This reduces the voltage drop across the NPN transistor, resulting in a higher output voltage than the input voltage.

The output voltage is regulated by a feedback loop which monitors the output voltage. If the output voltage exceeds the setpoint, the feedback loop reduces the current through the NPN transistor, lowering the output voltage. Conversely, if the output voltage falls below the setpoint, the feedback loop increases the current through the NPN transistor, raising the output voltage.

The LT3091MPFE#PBF voltage regulator is typically used in consumer electronics, industrial and automotive applications where tight output voltage regulation, fast transient response and low-noise performance are required. It is also an ideal choice for applications which require a cost-effective, low-noise solution.

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