Current - Output:	150mA
Base Part Number:	LP2967
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:	52dB ~ 70dB (120Hz ~ 1MHz)
Current - Supply (Max):	5mA
Current - Quiescent (Iq):	300µA
Series:	--
Voltage Dropout (Max):	0.42V @ 150mA
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	2.8V, 3.3V
Voltage - Input (Max):	16V
Number of Regulators:	2
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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LP2967IMMX-2833/NOPB Application Field and Working Principle

Introduction

The LP2967IMMX-2833/NOPB is a low-dropout (LDO) linear voltage regulator from Texas Instruments. It is part of the company\'s LP2967 cost-effective CMOS LDO series. The ultra-low-voltage unit provides 3A output and operates down to 0.8V while also improving system efficiency and extending battery life. With a wide input voltage range (1.7V to 21V), it helps protect sensitive loads and supports up to 8V transients.

Features

This device offers a host of features, including:

• Ultra-low voltage operation down to 0.8V
• 3A output current
• Wide input voltage range (1.7V to 21V)
• Protects sensitive loads with up to 8V transients
• Thermal shutdown and reverse-current protection
• Includes external compensation (See the data sheet for more information.)

Applications

The LP2967IMMX-2833/NOPB offers the benefit of providing power over distances when operating with low input voltage, and is therefore ideal for applications such as:

• Computers, servers and other data processing equipments
• Portable electronics, wearable devices and medical instruments
• Battery-powered products
• Wireless communications and charging stations

It is also suited for powering small sensor nodes like ZigBee, Wi-Fi, Bluetooth, and 4G/5G antennae.

Working Principle of Linear Voltage Regulators

A linear voltage regulator is an electrical circuit that uses a series of resistors and capacitors in a control loop to control the output. The output is determined by the feedback voltage or current, which is derived from the output itself. The feedback voltage is compared to a reference voltage or current, and the error is then corrected by adjusting the controlling elements of the circuit. The linear voltage regulator is usually composed of four basic components:

• Power supply: Input power for the regulator, which is typically in the form of positive and negative DC voltage.
• Reference voltage source: Produces a reference voltage on which the other components are based.
• Amplifier: A circuit that takes the difference between the reference voltage and the output voltage and amplifies it.
• Voltage Controller: A device that adjusts the output voltage (or current) of the regulator to a predetermined level.

When an input voltage is applied to the regulator, the reference voltage is compared to the output voltage. If the output voltage is different than the reference, the amplifier produces a signal that triggers the voltage controller, which then adjusts the output voltage according to the specified settings. The process of adjusting the output voltage is repeated until the desired output voltage is reached.

Conclusion

With its wide input voltage range, low voltage operation and other features, the LP2967IMMX-2833/NOPB is ideally suited for powering small sensor nodes and other applications such as computers, servers and portable electronics, where it provides power over distances. Its working principle is based on the use of a series of resistors and capacitors in a control loop, with a reference voltage or current being compared to the output voltage, and the difference being corrected by adjusting the controlling elements. This helps to ensure that the output voltage remains steady and its protection features prevent damage to sensitive loads.

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