LP3981IMM-2.5 Integrated Circuits (ICs)

Current - Output:	300mA
Base Part Number:	LP3981
Supplier Device Package:	8-VSSOP
Package / Case:	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Protection Features:	Over Current, Over Temperature, Short Circuit
Control Features:	Enable
PSRR:	50dB ~ 55dB (1kHz ~ 10kHz)
Current - Supply (Max):	210µA
Current - Quiescent (Iq):	120µA
Series:	--
Voltage Dropout (Max):	0.2V @ 300mA
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	2.5V
Voltage - Input (Max):	6V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Not For New Designs
Packaging:	Tape & Reel (TR)

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IntroductionPower Management Integrated Circuit (PMIC) is a complex circuit used to manage power in an integrated circuit. It is used to regulate and optimize power supply to various electronic components. Amongst various PMICs, Voltage Regulators is a key device used in most electronic application. The linear voltage regulator is the oldest form of a Voltage Regulator, which offers high accuracy of voltage output. It does need no adjustment after the external components are chosen, thus minimizing system complexity. These regulators are available in two forms, Fixed Output Regulator or Adjustable Output Regulator depending on the requirement of the application.LP3981IMM-2.5 is a Fixed Output Low Dropout (LDO) Linear Voltage regulator from Texas Instruments. It is available in an 8-Pin uses small size (1mmx1.5mm) DFN-8 package which makes it is ideal for space constraint applications. The device offers a full range of regulated output voltage from 1.4V to 5V which is programmable by changing the external resistors. The device is suitable for a wide range Low Voltage applications, spanning from load switch to power management systems. FeaturesThe device is packed with features, making it suitable for a wide range of applications. • Operating Voltage Range from 1.8V to 5.5V • Low Output Voltage of 1.4V• Low Quiescent Current (3 μA)• Low Drop Out Voltage Of 300mV at 100mA• Internal Current Limit with Foldback Current Limit • Free Output Short Circuit Protection• In Rush Current Limit• Thermal Shutdown• Hiccup Mode • Output Noise 0.2μVrms• Operating Temperature Range -40° to +125°CThe device comes with the option of Fixed Output Regulators having fixed output voltage of 1.8V, 2.5V, 3.3V and 5V with a minimum load of 5mA. The device pin layout and package design is compact in size, which helps to reduce the overall system PCB size.AdvantagesThe LP3981IMM-2.5 from Texas Instruments offer several reasonable advantages over the other traditional Linear Voltage Regulators, making it suitable for extensive use in consumer and industrial electronics. The device has a low dropout voltage, low quiescent current and wide operating voltage range which makes it suitable for applications running on very low supply voltages. It also has a unique feature of internal inrush current limit which reduces the start up current, thus decreasing the stress on internal components. This device also has thermal shutdown protection, hiccup mode and output noise which maintains steady voltage levels during operation. All these factors help in making the device highly reliable and stable.ApplicationsLP3981IMM-2.5 is suitable for a wide range of low voltage applications, ranging from power management systems to automotive monitoring systems. • Battery-powered Systems• Automotive Monitoring Systems• Automotive Body Electronics• Cell Phone Baseband • LCD Controllers• Low Power Audio Applications • Low Voltage Sensor Measurements Working PrincipleThe working principle of the LP3981IMM-2.5 follows the traditional operation of a linear regulator which includes an error amplifier, a series pass device and a feedback loop. The device uses an internal N-channel MOSFET as the series pass device. The output voltage is compared with the internally set regulated voltage inside the error amplifier. If the feedback voltage is lower than the reference voltage, then the MOSFET conducts, making the output voltage to rise until the two points of reference are equalized.The series pass MOSFET is driven by the error amplifier through a current mirror to provide the reference current needed to drive the pass device. The only limitation of this device is that, it needs to be supplied with a voltage higher than the output voltage. This feature is known as "Drop out voltage", which is maximum 300mV in the LP3981IMM-2.5.ConclusionLP3981IMM-2.5 is a Fixed Output Low Dropout Linear Regulator from Texas Instruments is ideal for a wide range Low Voltage application. Its low drop out voltage, low quiescent current and wide range of output voltage makes it a perfect choice for space constraint applications. The device has several features like Current Limits, Thermal Shutdown, and Hiccup Mode which makes it a reliable and accurate voltage source. The compact size makes it easy to integrate on board and requires no adjustment after the initial setup is done.

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