LP2981IM5-4.7/NOPB

Current - Output:	100mA
Base Part Number:	LP2981
Supplier Device Package:	SOT-23-5
Package / Case:	SC-74A, SOT-753
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Protection Features:	Over Current, Over Temperature, Short Circuit
Control Features:	Enable
PSRR:	63dB (1kHz)
Current - Supply (Max):	1.7mA
Current - Quiescent (Iq):	95µA
Series:	--
Voltage Dropout (Max):	0.37V @ 100mA
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	4.7V
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Part Status:	Obsolete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

LP2981IM5-4.7/NOPB is a low quiescent current, low dropout and low noise voltage regulator from Texas Instruments. It is an advanced linear voltage regulator with precision regulation and ultra low supply current for a wide range of applications. This device offers an excellent load and line regulation to guarantee a constant output voltage and low distortion of load transients.

Application Field

LP2981IM5-4.7/NOPB is used for ultra-low power applications, such as for powering processed data accelerometers, temperature and pressure sensors, LCD panel drivers and other applications with strict power supply requirements. Furthermore, it is used to maintain signal levels during signal conditioning and acquire accurate data readings.

Working Principle

LP2981IM5-4.7/NOPB belongs to the family of linear voltage regulators that use an internal circuit containing a voltage reference, an error amplifier, a series pass element and protection circuitry. The linear voltage regulator works by comparing an internally generated voltage to a regulated voltage and adjusting the pass element to maintain a constant voltage on the output of the device.

Voltage Reference

The voltage reference of LP2981IM5-4.7/NOPB is a key component for accuracy of the output voltage. It is also used as the reference voltage for the error amplifier and it is set to a certain reference voltage.

Error Amplifier

The error amplifier compares the voltage reference to the regulated voltage fed from the output of the series pass element. If the reference voltage is greater than the regulated voltage, the amplifier increases the output of the series pass element until the two voltages match. On the other hand, if the reference voltage is less than the regulated voltage, the amplifier decreases the output of the pass element.

Series Pass Element

The series pass element is used to control the output voltage. It is either a bipolar transistor or a field effect transistor (FET). The transistor is driven by the error amplifier and controls the output voltage. The pass element acts as a current source or a current sink to control the output voltage.

Protection Circuitry

The protection circuitry of LP2981IM5-4.7/NOPB is designed to protect the linear voltage regulator from damage due to overvoltage, overcurrent or thermal overloads. If an overload condition is detected, the protection circuitry will shut down the device and prevent further damage.

Conclusion

LP2981IM5-4.7/NOPB is a low quiescent current, low dropout and low noise linear voltage regulator from Texas Instruments. It is used for ultra-low power applications and it includes a voltage reference, an error amplifier, a series-pass element and protection circuitry. The protection circuitry helps protect the device from damage due to overvoltage, overcurrent or thermal overloads.

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