PQ1KA303MZPH

Voltage Dropout (Max):	0.7V @ 300mA
Supplier Device Package:	SOT-23L-6
Package / Case:	SOT-23L-6
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C
Protection Features:	Over Current, Over Temperature
Control Features:	Enable
PSRR:	55dB (120Hz)
Current - Quiescent (Iq):	800µA
Current - Output:	300mA
Series:	--
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	3V
Voltage - Input (Max):	15V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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Introduction to PQ1KA303MZPH

PQ1KA303MZPH is a three-terminal positive voltage regulator designed for use in a variety of applications. It is classified as a Linear Voltage Regulator (LVR) under PMIC - Voltage Regulators. It is specifically designed to provide adjustable output voltage from 1.2V to 27V. The device also features protection diodes, current limiting, thermal overload voltage and output short-circuit protection.

Application Field

PQ1KA303MZPH is a potential choice for new designs of battery-operated devices and application which requires regulated voltage. It is an ideal solution for applications that require high accuracy in output regulation with minimal power dissipation. Being a low dropout (LDO), it is well-suited for applications that need to provide regulated voltage and current in the presence of a low input voltage. Common applications of this device include system power supplies, notebook computers or LCD backlighting, general purpose voltage regulators, automotive audio and in-vehicle wireless communication systems.

Working Principle

The working principle of PQ1KA303MZPH lies between connecting and disconnecting two terminals that contains two essential elements – a differential amplifier and transistor. During operation, the amplifier monitors the voltage on the output terminal and compares it with a voltage reference signal. If the voltage on the output terminal deviates from the reference signal, it will control the transistor to alter the output current in order to bring the voltage back to within the reference tolerance The overall feedback circuit works like this. Variable resistor R1 adjusts the input voltage to the op-amp while R2 adjusts the reference voltage. When the input voltage of the amplifier is greater than the reference voltage, the output of the amplifier is low at which point the transistor turns off, generating a strong negative input to the feedback loop preventing the input from rising higher. Conversely, when the input voltage is lower than the reference voltage, the output of the amplifier is high and the transistor is activated thus increasing the current flow and increasing the input voltage in the feedback loop.

Conclusion

When looking for a three-terminal linear voltage regulator, PQ1KA303MZPH is a good candidate to consider. With features such as adjustable output voltage, current limiting, thermal overload protection, output short-circuit protection, and low dropout (LDO) implementation, this device is suitable for a variety of applications requiring a regulated voltage with high accuracy. It is also a good choice for applications where the input voltage is low but still requires a high output voltage.

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