LP2951CDMR2

Current - Output:	100mA
Base Part Number:	LP2951
Supplier Device Package:	Micro8™
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
Control Features:	--
PSRR:	--
Current - Supply (Max):	12mA
Current - Quiescent (Iq):	120µA
Series:	--
Voltage Dropout (Max):	0.45V @ 100mA
Voltage - Output (Max):	30V
Voltage - Output (Min/Fixed):	1.235V (5V)
Voltage - Input (Max):	30V
Number of Regulators:	1
Output Type:	Adjustable (Fixed)
Output Configuration:	Positive
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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Introduction to LP2951CDMR2

The LP2951CDMR2 is a 3-terminal low-dropout (LDO) voltage regulator that operates over an input voltage range of 1.2 to 6V. It is able to regulate an output voltage of 1.2V with a load current of up to 1A and its quiescent current is only 30µA. The LP2951CDMR2 is produced with a combination of precision thin-film resistors and advanced bipolar process technology, enabling it to provide a very high DC output accuracy along with excellent line and load regulation characteristics.

Application Field of LP2951CDMR2

The LP2951CDMR2 is frequently used in portable and battery powered systems, where capacity, efficiency and size considerations are paramount. It is an ideal regulator for powering a wide range of portable electronics such as digital cameras, phones and MP3 players, providing a clean and stable power supply. It can also be used in more general applications where a high degree of accuracy is required and extreme low dropout is desired.

Working Principle of LP2951CDMR2

The LP2951CDMR2 works by effectively maintaining a constant voltage across a load. Its three terminals are connected across the load, with the input terminal receiving a voltage via an external source. The output terminal provides current to the load, and the reference terminal is set to a predetermined value.When the input voltage is received, the LP2951CDMR2 compares the input voltage to the reference voltage. If the input voltage is greater than the reference voltage, the output voltage is regulated to the reference voltage. If the input voltage is lower than the reference voltage, the output voltage is regulated to the input voltage.This is done by employing an NPN pass transistor and a voltage reference, as well as a series of resistors and a closely matched pair of Zener diodes. A precision voltage divider at the output is used to fine-tune the output voltage. The overall output of the device is very stable, and is less than 100mV ripple over the whole operating range.

Summary

The LP2951CDMR2 is a 3-terminal low drop out voltage regulator that is suitable for powering portable and battery powered systems, where capacity, efficiency and size are of paramount importance. It is capable of regulating an output voltage of 1.2V with a load current of up to 1A and its quiescent current is only 30µA. It is designed to operate over an input voltage range of 1.2 to 6V and offers an excellent DC output accuracy and exceptionally good line and load regulation characteristics. The LP2951CDMR2 voltage regulator works by comparing the input voltage to the reference voltage, regulating the output accordingly. Its overall operation is extremely stable, providing less than 100mV ripple over the entire operating range.

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