LP3874ESX-ADJ

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The LP3874ESX-ADJ is a popular Power Management Integrated Circuit (PMIC) with high efficiency Linear Voltage Regulation. It is produced by Texas Instruments and has wide applications in consumer, industrial and medical electronics. The device offers several innovative features, including a low-side MOSFET pass transistor and low input and output voltages, making it very suitable for applications requiring higher current and high voltage precision.

The LP3874ESX-ADJ is a single-channel adjustable linear voltage regulator. It has an input range of 1.7V to 5.5V and an output adjustment range of 0.9V to 5.5V. It can handle up to 5A of load current with a maximum power dissipation of 21W at ambient temperatures up to 85 degrees Celsius. The output voltage tolerance of the regulator is guaranteed at a maximum of +/-1%. Additionally, the device provides short-circuit and thermal protection, as well as current limiting, which protect it from over voltage or current conditions.

The LP3874ESX-ADJ consists of two major functional blocks, namely the linear regulator and the reference circuits. The linear regulator is composed of two pass transistors, a top-side MOSFET and a bottom-side MOSFET, which are connected in a cascode configuration. When the input voltage is greater than the programmed output voltage, the bottom-side MOSFET conducts and hence reduces the voltage at the output. When the input voltage is lower than the programmed voltage, the top-side MOSFET conducts and increases the output voltage.

The reference circuit in the LP3874ESX-ADJ is composed of a resistor, a comparator, and an internal reference voltage. The input voltage is compared to this reference voltage and the error signal is fed back to the input voltage divider network. The output voltage is then adjusted according to the result of this feedback loop. This process is known as voltage regulation or voltage loop control.

The LP3874ESX-ADJ is suitable for a variety of applications, including microprocessors, digital signal processing (DSP) chips, FPGA chips, and various analog circuits. Its high efficiency and precise voltage control make it very suitable for consumer, industrial and medical electronic designs. It is also ideal for battery-powered handheld devices, where high efficiency and precise regulation of output voltage is required.

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