VREF-S
Series voltage reference
Provides a reference voltage through a series-connected supply and output arrangement.
Schematic
Symbols · LDO
Low-dropout voltage regulator
In plain English
What does Low-dropout voltage regulator mean?
An LDO is a linear voltage regulator designed to operate with its specified small input-to-output voltage headroom.
A simple example
A circuit can use an LDO when the available supply is only moderately above the required output.
What the drawings help you do
Use the same input/output distinction as for a linear regulator, but identify the required dropout conditions from the selected LDO. Low dropout describes its permitted voltage headroom, not zero loss or the ability to regulate from any input. Output-component and stability requirements remain device-specific.
- Dropout
- The operating region associated with insufficient regulation headroom.
- LDO
- A linear regulator designed for a specified small input-to-output voltage difference.
Before using this reference
- Identify input/output conditions and load current.
- Reference the specified dropout conditions.
- Follow the selected device’s output-component and thermal requirements.
Will an LDO regulate when its input falls below the desired output?
Not as an ordinary assumption. The selected regulator needs its specified input conditions. Low-dropout operation reduces required headroom under defined conditions; it does not create a general step-up conversion function.
Read the source: Linear voltage regulation
Schematic · LDO
A distinction that matters
Low dropout does not mean zero loss or unrestricted operation below the required input voltage.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Linear voltage regulation
Linear voltage regulation: public technical context for the named function. Product and compliance details remain with the publisher.
About this graphic
This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.
SVG and DXF downloads contain this original artwork. DXF uses unscaled drawing units; a GA envelope supplies no product dimensions, clearances or fabrication information. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
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