LM4132CMF-3.3

The LM4132CMF-3.3 is an extension of the LM4132 series of Low Drop-Out (LDO) voltage regulators designed to provide a voltage reference of 3.3V. It is categorized as a PMIC-Voltage Reference device as it has two integrated components, one being a dual low-dropout linear regulator and the other, an adjustable voltage reference.

This device is suitable for use in applications such as embedded systems, digital automotive electronics, multimedia equipment and PCs, communications and networking equipment, etc. The LM4132CMF-3.3 comes equipped with several features for enhanced performance, such as low noise and quiescent current operation, thermal shutdown protection, and high power supply rejection ratio. It has a fixed-output capability with a maximum output current of 150 mA at 3.3V.

To understand the working of the LM4132CMF-3.3, we first take a look at the two integrated components mentioned earlier. The dual low-dropout (LDO) linear regulator serves to provide a regulated output voltage at a given current. It contains two separate voltage reference circuits, the first being used to limit the minimum output voltage and the second, to limit the maximum output voltage. This range is established from a range of available reference voltages which is set by external resistors.

The second integrated component, the adjustable voltage reference core is a voltage reference circuit with a variable threshold voltage. This is done by the adjustment of a resistor network connected between the gate and reference pins. The adjustment is made either by an external voltage applied to the gate pin or by an external resistor connected between the gate and source pins. The adjustable threshold voltage can range from 2.85V to 5.5V.

The LM4132CMF-3.3 is designed to operate over an output voltage range of 2.85V to 4.0V and a minimum input-voltage range of 2.6V. The output is normally regulated at 3.3V but is adjustable with the external resistor network. If the output voltage is higher than the desired voltage after adjusting the external resistor network, the adjustable voltage reference core will adjust the threshold level to reduce the output voltage.

The LM4132CMF-3.3 operates on a low quiescent current of 10µA and has a power-supply rejection ratio of 90dB, which helps in maintaining a low noise operation. It features an active low thermal shutdown circuit, which protects the device from overheating and possibly damaging the package and other electrical components connected to the circuit.

Overall, the LM4132CMF-3.3 is a highly efficient voltage reference device with versatile features such as adjustablevoltage reference core, low quiescent current of 10µA, low noise operation, and active low thermal shutdown circuit. Additionally, it is suited for a wide range of applications, making it a preferred choice for various digital electronics platforms.

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