LDO Linear Voltage Regulators

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

Multiple output of regulated voltage of fixed output

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

• 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 regulators with the highest performance for quiescent current, including the lowest quiescent current LDO in the market that consumes only 20 nA (typical) while operating in a no-load state

• CL family of current regulators that operate at up to 220V with currents up to 100 mA
• LR family of linear voltage regulators that operate from input voltages up to 540V, with fixed and adjustable version sourcing from 10 mA to 50 mA

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.

Use our interactive LDO Selector Guide to easily filter and find linear regulators that meet the requirements of your applications.

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.

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.

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. 

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.

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.

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

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

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