PQ1R42

Voltage Dropout (Max):	0.4V @ 150mA
Supplier Device Package:	SOT-23L-6
Package / Case:	SOT-23L-6
Mounting Type:	Surface Mount
Operating Temperature:	-30°C ~ 80°C
Protection Features:	Over Current, Over Temperature
Control Features:	Enable
PSRR:	55dB (400Hz)
Current - Quiescent (Iq):	350µA
Current - Output:	150mA
Series:	--
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	4.2V
Voltage - Input (Max):	16V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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Introduction

PQ1R42 application field and working principle is related to the linear voltage regulator. It is a power management integrated circuit (PMIC) for energy efficient design that meets the demands of portable and low-power applications. It provides voltage output accuracy, long life and low power consumption in a variety of circuit designs.Linear Voltage Regulators provide a continuous regulated output by controlling the current of conducting transistors. The regulator compares an internal reference voltage to the voltage at the input, which is known as the “set point”. If the set point is exceeded, the regulator puts more current into the circuit to reduce the output voltage. Conversely, if the set point is lower than the input voltage, the regulator decreases the current and increases the output voltage.

Function of PQ1R42

PQ1R42 is a low dropout, low power linear regulator. It can provide output of up to 1A with a minimum input voltage of 1.5V and maximum of 5.5V. It has an output voltage accuracy of 0.5% and temperature stability at a maximum of ±2%. It features short-circuit protection, under- and over-voltage protection, and over-temperature protection and over-current protection. It has a low current ripple, low output noise and low quiescent current in normal mode.The PQ1R42 is well suited for powering various types of low-power devices such as sensors and displays. It is well suited for energy efficient design in mobile and other handheld devices. It is well-suited for distributed power systems and can be used in digital displays, LED lighting, LED drivers, and audio amplifiers. It can also be used in low-noise power management applications.

Working Principle

The PQ1R42 works through a process of matching the internal reference voltage against the input voltage to achieve the desired output voltage. The current is adjusted to bring the internal reference voltage in line with the desired output voltage.At the input, the PQ1R42 passes current through a fixed resistor network to power the voltage regulator. The output voltage is determined by the ratio of the resistor values and the reference voltage. As the input voltage changes, the resistor network adjusts the reference voltage to maintain the desired output voltage level.The internal regulating transistors are connected in series in order to keep the output voltage constant even when the input voltage is varied. The NPN type transistors control the current in the output circuit when being biased on. As the input voltage increases, the PQ1R42 responds by reducing its output current, while the PNP type transistors drive the output current when being biased off. It also provides internal over-current protection by sensing the current in the output circuit.

Conclusion

The PQ1R42 is a low dropout, low power linear regulator that is suitable for powering a wide range of low-power devices. It features an output voltage accuracy of ± 0.5% and temperature stability at a maximum of ±2%. It offers short-circuit protection, under- and over-voltage protection, and over-temperature and over-current protection. It works through a process of adjusting the current to match the internal reference voltage against the input voltage to achieve the desired output voltage. It is ideal for energy-efficient design in mobile and other handheld devices and for distributed power systems.

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