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Linear Low-Dropout (LDO) Voltage Regulators

Choosing the right linear Low-Dropout (LDO) voltage regulator is critically important. Power management is vital in a world driven by smaller devices reliant upon batteries that require efficient power consumption and precision.

Our linear LDO regulators feature ultra-low quiescent current, ultra-low dropout voltage, ultra-high ripple rejection, very accurate output, fast transient response, a wide selection of packages and a wide input voltage range.

 

LDO Linear Voltage Regulator Products

Single Output LDO Regulators

Single output of regulated voltage with your choice of fixed or adjustable output

Multiple Output LDO Regulators

Multiple output of regulated voltage of fixed output

Ripple Blocker LDOs

LDOs with low-pass filter in one package for high PSRR for various frequency ranges

LDO Controllers and SIM Card Products

  • LDO controllers include all the control functions required in the design of low dropout linear regulator (LDO)
  • SIM card level shifters integrate three high-speed level shifters for SIM card signal translation and an LDO to power the SIM card

LDO Selector Guide

The LDO Selector Guide is an interactive tool that can be used to easily filter and find linear regulators that fit customer-specific applications.


Featured LDO Product

MCP1792/3

The MCP1792/3 are high-voltage Low Dropout (LDO) regulators that can generate 100 mA output current.

Quick Glance:

  • Ideal power solution for wide input voltage up to 55V with 70V transient
  • AEC-Q100 qualified and PPAP capable - Automotive Grade 0
  • Low quiescent current
  • Stable with cost-effective ceramic capacitors
  • Short circuit current foldback protection
MCP1792 Chip DIagram

MCP1792

3 pins: VIN, VOUT, Ground (GND)

MCP1793

5 pins: VIN, VOUT, Ground (GND), Enable (EN), No Connect (NC)

MPLAB® Analog Designer

MPLAB Analog Designer Logo

Provides design suggestions for common circuit needs, estimates performance for common modifications, and can export to MPLAB® Mindi™ Analog Simulator for verification.

Try It Now

MPLAB® Mindi™ Analog Simulator

MPLAB MINDI Analog SImulator

Uses a SIMetrix/SIMPLIS environment to model circuit behavior, reducing design time with software debugging for initial design verification.

Learn More

Power Check Design Service

Zero Power? Infinite Problems.

Provides advice on your exact physical circuit layout, sharing best practices from an experienced power supply designer, so that physical hardware will match simulations.

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What are linear Low-Dropout (LDO) regulators?
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Linear LDO regulators are a simple solution for regulating a higher voltage to a lower voltage through an integrated circuit without the use of an inductor. LDOs span a wide spectrum of specialized uses and can be widely implemented in today’s electronics because of their simplicity and low cost.

Why use linear LDO regulators?
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Today, as battery operated devices drive nearly every aspect of everyday life, LDOs prove to be an effective tool in achieving low power consumption and high power efficiency. Many other types of regulators exist on the market but, in many cases, linear LDO regulators prove to be the most cost-effective solution to modern power regulation. The lack of a large and expensive inductor allows LDOs to achieve a much smaller footprint and higher overall value when considered from a cost/benefit perspective. LDOs are a straightforward and cost-effective solution to linear power regulation.

How do you choose the right linear LDO regulator?
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With such a large variety of LDOs available in today’s market it can be difficult to identify the optimal LDO for your application. Here are four important characteristics to consider before selecting an LDO:

Low Dropout: This is the main purpose of the linear LDO regulator. Though there are many ways to utilize an LDO, maintaining a low dropout between the input and output voltage is the LDO’s primary purpose. This is an important aspect to consider before choosing an LDO as a power regulation solution.
Accuracy: As the performance and capability of technology continues to grow at a rapid rate, it is crucial that the core components of these devices meet stringent requirements and operate on a consistent and leading-edge basis. The LDO’s responsibility is not only to have a low input to output dropout but also to ensure that the voltage is outputted with the smallest margin of error. 

Power Supply Rejection Ratio (PSRR): In the process of dropping input voltage to output voltage, various unwanted frequencies could find their way into the integrated circuit. The PSRR of a linear regulator is the measurement of how well the integrated circuit filters/rejects out extraneous noise in the input voltage signal before voltage is outputted. High PSRR typically correlates to a more consistent output accuracy.

Low Quiescent Current: Also known as IQ, quiescent current is the current that is drawn from an integrated circuit while it is in a quiescent (no-load, non-switching) state. IQ can be understood as the minimal amount of current needed to power the basic functionalities of a device. The lower the rated quiescent current of a linear regulator, the more power efficient the linear regulator is in a no-load state.

Key features of linear LDO regulators
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  • Output currents range from 10 mA to 7.5A with multiple outputs
  • Wide selection of packages from 1 × 1 mm DFN packages to TO-263
  • Ultra-low dropout voltage of 40 mV at full load
  • Ultra-high ripple rejection ratio of 90 dB+
  • Very accurate output of 0.4% typical
  • Ultra-low quiescent current of 20 nA typical
  • Wide input voltage up to 120V