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PMIC - Voltage Regulators - Linear

The AP1115AY35G-13 is a low noise and low dropout linear regulator from Nantian Electronics with excellent line and load regulation, fast response time, and very low output-noise (0.003%). This device is primarily used to provide a stable and accurate output voltage from an input voltage source, remove voltage noise spikes and reduce the heat output from regulated power supplies. This regulator is designed for applications with very low noise requirements, such as RF communication and precision analog devices.

Application Field

The AP1115AY35G-13 is typically used in power management applications such as digital TV, set-top boxes, multimedia systems, and all sorts of devices requiring a stable and accurate output voltage, such as portable industrial instruments and medical instruments. It is particularly well-suited for applications which require very low noise and very high accuracy, such as audio amplifiers, RF pulse generators, RF communication devices, and precision analog devices.

Working Principle

Linear regulators operate by drawing sufficient current from the input voltage source to maintain the output voltage at a certain level. This current draw is called the quiescent current, or IQ. Increasing the output voltage slightly increases the quiescent current, and thus the quiescent current increases slightly with load current, although the total increase is very small. The required input voltage must always remain above the desired regulated output voltage plus the regulator\'s voltage dropout: otherwise the regulators output voltage fails to maintain regulation.

The AP1115AY35G-13 also utilizes a P-channel MOSFET as the pass element. The transistor used in this device has a maximum voltage rating of -17V, but with its integrated protection circuit, the device can safely tolerate more than -20V, allowing a wide range of input voltages. The design of the protection circuit also reduces the voltage dropout to 0.1V at room temperature, allowing a low input-output voltage differential.

The AP1115AY35G-13 also includes several features which improve performance and enhance reliability. It has an error amplifier with a fast response time and an improved output stage with a high PSRR (power-supply-rejection-ratio). Its built-in overcurrent protection circuit and reverse current protection circuit extend device lifetime and improve safety.

Conclusion

The AP1115AY35G-13 from Nantian Electronics is a low noise, low dropout linear regulator with excellent line, load and temperature regulation, fast response time, and very low output-noise, making it suitable for very low noise and very high accuracy applications. Its high tolerance of reverse current and over-current protection circuits protect it from damage and enhance safety. With its broad range of features, this regulator is definitely an excellent option for many power management applications.

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