SPX3819S-L-1-8

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Linear Voltage Regulators are a basic component commonly used in electric circuits. They are used to provide a steady output voltage from an input voltage source, regardless of variations in supply voltage, load current, or temperature. The SPX3819S-L-1-8 is a low quiescent current, 3.2V to 6V input low dropout regulator with a maximum dropout voltage of 350mV that has an average quiescent current of 275uA at 1mA load. This makes it one of the most efficient linear voltage regulators available to the market.

Uses of The SPX3819S-L-1-8

The SPX3819S-L-1-8 can be used in many different applications. It can be used to regulate voltage in battery-powered systems and can also be used in automotive, medical, and industrial applications. It is ideal for use in low power/low profile systems, such as internet-of-things (IoT) systems, wearables and portable applications. This regulator also complies with the IEC60601-1 medical safety requirement and requires only two external capacitors, allowing it to occupy only minimal board space.

Working Principle

The SPX3819S-L-1-8 works by utilizing an internal current source which provides a low output impedance on a reference voltage pin. This reference voltage is set by an external resistor. The voltage at the error amplifier’s inverting input is provided by the voltage divider formed by the two external resistors connected to the output pin. The differential between the reference voltage and the divided output voltage is amplified and applied to the gate of the NMOS output transistor, which drives the output voltage to the desired voltage set by the voltage divider.

The voltage feedback loop compensates for changes in load conditions as well as changes in temperature and supply voltages. The delay of the output voltage is kept short, with typical falling times of 40µs, while rising times are adjustable, depending on the connected capacitance on the output.

Power Safety Features of the SPX3819S-L-1-8

The SPX3819S-L-1-8 also contains a number of protection features to ensure safe operation. This includes an internal temperature monitor, which shuts down the regulator in case of over-temperature and a power-on reset (POR) circuit which remains active in the standby mode. It has over current protection (OCP) and over voltage protection (OVP) to prevent accidental supply surges, as well as current-limit protection (CLP) to protect against load faults. It also features dynamic current limit, which allows a dynamic adjustment of the currents that are sourced and sunk from the output.

Conclusion

The SPX3819S-L-1-8 is a low quiescent current and low dropout linear voltage regulator that is ideal for use in low power and low profile systems. This regulator provides a steady output voltage, regardless of varying input voltages, load currents, or temperatures. The SPX3819S-L-1-8 also has a number of protection features and only requires two external capacitors, allowing it to occupy minimal board space and making it one of the most efficient linear voltage regulators available in the market.

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