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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Select featured LDOs

TPS7A20L
Linear & low-dropout (LDO) regulators

300-mA low-noise, low-IQ voltage regulator with high PSRR and 1.2-V logic-compatible enable

Approx. price (USD) 1ku | 0.11

TPS7A53B
Linear & low-dropout (LDO) regulators

3-A, 1.1-V, low-VIN, low-noise high-accuracy ultra-low-dropout voltage regulator with 0.5-V low VREF

Approx. price (USD) 1ku | 1.19

TLV773
Linear & low-dropout (LDO) regulators

300-mA high-PSRR low-IQ low-dropout regulator with enable

Approx. price (USD) 1ku | 0.018

TPS7B4256-Q1
Linear & low-dropout (LDO) regulators

Automotive, 70-mA 40-V voltage-tracking low-dropout regulator with FB and 6-mV tracking tolerance

Approx. price (USD) 1ku | 0.493

TPS7B4255-Q1
Linear & low-dropout (LDO) regulators

Automotive, 70-mA 40-V voltage-tracking low-dropout (LDO) regulator with 5-mV tracking tolerance

Approx. price (USD) 1ku | 0.339

TPS7A21-Q1
Linear & low-dropout (LDO) regulators

Automotive, 500mA, low-noise ultra-low-IQ high-PSRR low-dropout (LDO) voltage regulator

Approx. price (USD) 1ku | 0.248

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. 

Video
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.
PDF
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.
PDF
Featured products for power density
TPS7A54 ACTIVE 4-A, low-VIN (1.1-V), low-noise, high-accuracy, ultra-low-dropout (LDO) voltage regulator
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.
PDF
Video
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 200mA, 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.

Video
LDO Basics: Noise
This video discusses the sources of noise and how to best mitigate noise in your application.
Video
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.  
PDF
Featured products for low noise & precision
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

E-book
E-book
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

Discover featured applications

Smart metering
Low-noise, high power-supply rejection ratio (PSRR) low-dropout regulators (LDOs) enable sensor loads to reach their peak performance – without compromising the life span of smart meters.
Traction inverter
Convert energy stored in a battery to instantaneous multiphase AC power for traction drives with highly accurate, high PSRR LDOs compliant with AEC-Q100 qualification testing.
Medical imaging
Provide clean, steady rails for analog front ends, field-programmable gate arrays (FPGAs) and digital signal processors with our highly accurate, high PSRR LDOs.
Wearable electronics
Create wearable medical and personal electronics that maximize battery run time with low quiescent current (IQ) in chipscale packages.
HEV-EV powertrain
Maintain clear rails in electric vehicle charging with AEC-Q100 LDOs.

Low-noise, high power-supply rejection ratio (PSRR) low-dropout regulators (LDOs) enable sensor loads to reach their peak performance – without compromising the life span of smart meters.

LDOs maximize measurement accuracy and reduce noise and power consumption in gas, electricity, heat and water meters. Our low standby current and low-noise LDOs can achieve longer battery run times while maintaining low transient performance.

Featured resources

REFERENCE DESIGNS
  • TIDA-00839 – Magnetic Tamper Detection Using Low-Power Hall Effect Sensors Reference Design
  • TIDA-010008 – Flat-Clamp TVS based Reference Design for Protection Against Transient for Grid Applications
PRODUCTS
  • TPS709 – 150-mA, 30-V, ultra-low-IQ, low-dropout voltage regulator with reverse current protection and enable
  • TLV740P – 300-mA low-dropout (LDO) regulator with foldback current limit
  • TLV704 – 150-mA 24-V ultra-low-IQ low-dropout (LDO) voltage regulator
TECHNICAL RESOURCES

Convert energy stored in a battery to instantaneous multiphase AC power for traction drives with highly accurate, high PSRR LDOs compliant with AEC-Q100 qualification testing.

Design efficient drivetrains with wide voltage range, low power consumption LDOs. Maintain clean rails with high PSRR and high accuracy over temperature, without compromising safety or performance.

Featured resources

REFERENCE DESIGNS
  • PMP23223 – Smart isolated gate driver with bias supply reference design
  • TIDA-020014 – HEV/EV traction inverter power stage with 3 types of IGBT/SiC bias-supply solutions reference design
PRODUCTS
  • TPS7B84-Q1 – Automotive 150-mA, 40-V, low-dropout (LDO) linear regulator with enable and fast transient response
  • TPS7B86-Q1 – Automotive 500-mA, 40-V, ultra-low-IQ, low-dropout (LDO) linear regulator with power good
  • TPS7B4253-Q1 – Automotive 300-mA, off-battery (40-V), adjustable voltage-tracking low-dropout voltage regulator

Provide clean, steady rails for analog front ends, field-programmable gate arrays (FPGAs) and digital signal processors with our highly accurate, high PSRR LDOs.

LDOs with a high PSRR and low noise make it possible to achieve precise and clean rails in medical imaging signal chains such as converters, clocks and FPGAs by generating a clean DC signal, which prevents the power supply from compromising noise-sensitive loads. Devices with low thermal resistance are also important in medical applications, given the combination of high input voltages and high current.

Featured resources

REFERENCE DESIGNS
  • TIDA-01352 – 400-W Continuous, Scalable, ±2.5- to ±150-V, Programmable Ultrasound Power Supply Reference Design
  • TIDA-01458 – Low-Noise Fixed Drop-Out ±2.5 to ±12-VOUT 3A Power Supply Reference Design for Ultrasound CW Pulser
PRODUCTS
  • TPS7A57 – 5-A, low-input-voltage, low-noise, high-accuracy low-dropout (LDO) voltage regulator
  • TPS7A94 – 1-A, ultra-low noise, ultra-high PSRR, RF voltage regulator
  • TPS7A39 – 150-mA, 33-V, low-noise, high-PSRR, dual-channel positive & negative low-dropout voltage regulator
DESIGN TOOLS AND SIMULATION

Create wearable medical and personal electronics that maximize battery run time with low quiescent current (IQ) in chipscale packages.

Our low-power low-dropout regulators enable extended battery life in chip-scale packaging for medical and commercial wearable electronics. Low-IQ devices minimize power consumption while wearable devices are in standby mode, without compromising performance.

Featured resources

REFERENCE DESIGNS
  • TIDA-00373 – Backlight and Smart Lighting Control by Ambient Light and Proximity Sensor Reference Design
  • TIDA-050007 – Ultra-low Standby Power Reference Design for Wireless Earbud Battery
  • PMP21884 – Tiny, ultra-low IQ DC/DC power supply with battery charging reference design for wearables
PRODUCTS
  • TPS7A02 – 200mA, nanopower-IQ (25 nA), low-dropout (LDO) voltage regulator with enable
  • TPS7A20 – 300-mA ultra-low-noise low-IQ low-dropout (LDO) linear regulator with high PSRR
  • TPS7A13 – 300-mA, low input and output voltage, ultra-low-dropout (LDO) voltage regulator

Maintain clear rails in electric vehicle charging with AEC-Q100 LDOs.

Single-phase AC, 400-V onboard chargers and high- to low-voltage DC/DC converters in hybrid and electric vehicles are using low-cost LDOs with low noise to maintain stable voltage rails.

Featured resources

REFERENCE DESIGNS
  • TIDA-020030 – SiC/IGBT isolated gate driver reference design with thermal diode and sensing FET
  • TIDA-020014 – HEV/EV traction inverter power stage with 3 types of IGBT/SiC bias-supply solutions reference design
  • PMP30473 – Lowest noise auxiliary dual output power supply reference design
PRODUCTS
  • TPS7B84-Q1 – Automotive 150-mA, 40-V, low-dropout (LDO) linear regulator with enable and fast transient response
  • TPS7B81-Q1 – Automotive 150-mA, off-battery (40-V), ultra-low-IQ, low-dropout voltage regulator with enable

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, (...)

Reference designs related to Linear & low-dropout (LDO) regulators

Use our reference design selection tool to find designs that best match your application and parameters.