Linear & low-dropout (LDO) regulators

With the largest portfolio of LDOs, we have the right one for you

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Linear and low-dropout (LDO) regulators are a simple, inexpensive way to provide a regulated output voltage that is powered from a higher voltage input in a variety of applications. Our extensive portfolio will help you meet nearly any regulator design challenge, from powering sensitive analog systems to extending battery life. Our solutions include the industry’s first smart AC/DC linear regulator, as well as many features such as low noise, wide input voltage (VIN), small package footprint and low quiescent current (IQ).

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Automotive, 3-A, low-VIN low-noise (5.6-µVRMS) high-accuracy ultra-low-dropout voltage regulator

Approx. price (USD) 1ku | 1.77

50-mA, 85-V, ultra-low IQ, dual low-dropout voltage regulator with power good and precision enable

Approx. price (USD) 1ku | 1.37

Enhanced-product, 500-mA low-noise low-IQ low-dropout regulator with reverse current pr

Approx. price (USD) 1ku | 3.49

1.5-A low-dropout (LDO) linear regulator with programmable soft start

Approx. price (USD) 1ku | 0.5

100-mA, 60-V, 5-μA quiescent current, low-dropout (LDO) voltage regulator with power good and enable

Approx. price (USD) 1ku | 0.99

5-A, low-input-voltage, low-noise, high-accuracy low-dropout (LDO) voltage regulator

Approx. price (USD) 1ku | 5.5

Power trends

Power density

You can further improve your application’s performance when you consider thermals. An LDO’s nature is to regulate a voltage by turning excess power into heat, making this integrated circuit a good fit for low-power or small VIN-to-VOUT differential applications. Choosing the right LDO with the right package is crucial to maximizing an application’s performance. 

LDO Basics: Thermals
Watch this video to understand how the smallest available package is not always the best match for the desired application.
Application note
An empirical analysis of the impact of board layout on LDO thermal performance
This application report investigates the impact of the printed circuit board (PCB) layout on LDO thermal performance. Three LDOs are tested with five layouts, each containing increasing amounts of copper coverage on the PCB.
Application note
Measuring the Thermal Impedance of LDOs in situ
This document describes a procedure for computing the junction-to-ambient thermal impedance of an IC.
Featured products for power density
TPS7A54 ACTIVE 4-A, low-VIN (1.1-V), low-noise, high-accuracy, ultra-low-dropout (LDO) voltage regulator
NEW TPS7A21 ACTIVE 500-mA, low-noise ultra-low-IQ high-PSRR low-dropout (LDO) voltage regulator
TPS7A78 ACTIVE 120-mA, smart, capacitance-drop, low-dropout (LDO) linear voltage regulator
Low quiescent current (IQ)

We understand that achieving ultra-low quiescent current (IQ) shouldn’t compromise your system performance. We offer regulators with low standby power combined with excellent load transient response so that you can achieve the longest battery runtimes while maintaining key performance. Our linear regulator portfolio includes low-IQ LDOs with input voltages as high as 100 V to help you with your low-standby power needs.

White paper
Understanding the Foundations of Quiescent Current in Linear Power Systems
This paper addresses the fundamentals of IQ in LDOs and explains how to extend battery life without compromising system performance. Other topics covered are what happens to IQ in dropout and how IQ affects transient performance.
LDO Basics: Quiescent Current
This video explores how LDOs are a simple solution to help boost the runtime of any battery driven device for a few more seconds, minutes, hours or even days.
Featured products for low quiescent current (IQ)
TPS7A02 ACTIVE 200-mA, nanopower-IQ (25 nA), low-dropout (LDO) voltage regulator with enable
TPS7A24 ACTIVE 200-mA, 18-V, ultra-low-IQ, low-dropout (LDO) voltage regulator with enable
TPS7B82-Q1 ACTIVE Automotive 300-mA, off-battery (40-V), ultra-low-IQ LDO with enable in AEC-Q100 Grade-0 and Grade-1
Low noise & precision

We can help solve your low-noise design challenges with a broad portfolio of low-noise and high power-supply rejection ratio (PSRR) regulators. High PSRR over a wide bandwidth enables the LDO to filter switching noise emanating from upstream DC/DC converters. Low-noise (<5 µVRMS) outputs minimize low-frequency noise to maintain the signal integrity of sensitive analog circuitry such as ADCs or DACs, helping you generate clean power for precision applications.

LDO Basics: Noise
This video discusses the sources of noise and how to best mitigate noise in your application.
LDO Basics: Power Supply Rejectino Ratio (PSRR)
This video explains power supply rejection ratio (PSRR). We also cover the importance of output capacitors and how the difference between the input voltage and output voltage can affect the PSRR performance of an LDO.
White paper
How to measure LDO noise
This paper breaks down the challenges of measuring the output noise of low-noise LDOs. It also discusses how to use the data provided by the spectrum analyzer and how to avoid common issues people have when measuring noise.  
Featured products for low noise & precision
NEW TPS7A94 ACTIVE 1-A, ultra-low noise, ultra-high PSRR, RF voltage regulator
TPS7A53 ACTIVE 3-A, low-VIN (1.1 V) low-noise high-accuracy ultra-low-dropout (LDO) voltage regulator
TPS7A20 ACTIVE 300-mA ultra-low-noise low-IQ low-dropout (LDO) linear regulator with high PSRR

Technical resources

LDO Basics (Rev. A)
Read about the fundamentals of working with LDOs including dropout, thermal dissipation, IQ, PSRR and noise performance. Learn how to prevent reverse current and why the value of a capacitor is not equal to its capacitance. 
document-pdfAcrobat PDF
Selection guide
Selection guide
Low Dropout Regulators Quick Reference Guide (Rev. P)
In this quick reference guide you will find our most popular LDOs and linear voltage regulators for any kind of application, including industrial, automotive, personal electronics and communications equipment.
document-pdfAcrobat PDF
Application note
Application note
A Topical Index of TI LDO Application Notes (Rev. F)
A collection of our LDO application notes categorized by topic with a short abstract of each to help you quickly find the most relevant application information. 
document-pdfAcrobat PDF

Design & development resources

Simulation tool
PSpice® for TI design and simulation tool
PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Evaluation board
Universal LDO linear voltage regulator evaluation module for DBV, DRB, DRV and DQN packages

The MULTIPKGLDOEVM-823 evaluation module (EVM) helps you evaluate the operation and performance of several common packages of linear regulators for possible use in circuit applications. This particular EVM configuration has a DRB, DRV, DQN and DBV footprint for you to solder and (...)

Evaluation board
Universal LDO linear voltage regulator evaluation module for DCY, DDA and KVU packages

The MLTLDO2EVM-037 multipackage low-dropout (LDO) evaluation module (EVM) allows design engineers to evaluate the operation and performance of several common packages of linear regulators for possible use in their own circuit application. This EVM configuration contains a DDA, 3-pin and 5-pin KVU, (...)

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