100mA Low Dropout Voltage Regulator (LDOs)


Information 100mA Low Dropout Voltage Regulator (LDOs)
Package NSOIC-8
VOUT (V) 3.3, 5
IQ (µA) 150
VIN MIN (V) 2.4
VIN MAX (V) 30
Features Enable, Power Good, Current limit, thermal protection
Junction Temp Range (°C) -40 to 125
IOUT (mA) 100
Accuracy (%) 0.5%, 1%
Output Option Fixed
Vdrop (mV) 380
Output Noise (µVRMS) 100
PSRR (dB) -
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The LP2950 and LP2951 are low power voltage regulators. These devices are an excellent choice for use in battery powered application such as cordless telephones, radio control systems and portable computers. The LP2950 and LP2951 feature low quiescent current and low dropout voltage (typical 50mV at light load and 380mV at 100mA). This includes a tight initial tolerance (0.5% typical), extremely good load and line regulation (0.05% typical) and very low output temperature coefficient (20 ppm/ºC typical), making the LP2950/LP2951 useful as a low power voltage reference.

The error flag output feature is used as a power-on reset for warning of a low output voltage, due to a falling input voltage. The logic-compatible shutdown feature enables the regulator to be switched on and off. The LP2950 is offered in a 3-pin TO-92 package compatible with other 5V, 3.3V regulators. The LP2951 is available in an 8-lead SOIC package.

  • 5.0V and 3.3V versions at 100mA output
  • Very low quiescent current
  • Low dropout voltage: 380mV at 100mA
  • Extremely tight load and line regulation
  • Very low temperature coefficient
  • Current and thermal limiting
  • Need only 1 uF for stability
  • Error flag warns of output dropout
  • Logic controlled electronic shutdown
  • 5.0V part allows adjustable output from 1.25V to 29V

Documentation & Design Tools

Type Title Version Date File Size
Data Sheets LP2950/LP2951 Data Sheet H December 2021 3.6 MB
Application Notes ANP-02, Thermal Considerations for Linear Regulators A November 2006 351 KB
Application Notes ANP-03, Thermal Calculator A February 2001 27 KB
Product Brochures Power Management Brochure October 2020 2.4 MB
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Quality & RoHS

Part Number RoHS | Exempt RoHS Halogen Free REACH TSCA MSL Rating / Peak Reflow Package
LP2951CS-L-5-0/TR N Y Y Y Y L1 / 260ᵒC NSOIC8
LP2951CS-L-3-3/TR N Y Y Y Y L1 / 260ᵒC NSOIC8

Click on the links above to download the Certificate of Non-Use of Hazardous Substances.

Additional Quality Documentation may be available, please Contact Support.

Parts & Purchasing

Part Number Pkg Code Status Suggested Replacement Buy Now Order Samples PDN
LP2951CS-L-3-3 NSOIC8 OBS LP2951CS-L-3-3/TR
LP2951CS-L-3-3/TR NSOIC8 Active Order
LP2951CS-L-5-0 NSOIC8 OBS LP2951CS-L-5-0/TR
LP2951CS-L-5-0/TR NSOIC8 Active Order
Show obsolete parts
Part Status Legend
Active - the part is released for sale, standard product.
EOL (End of Life) - the part is no longer being manufactured, there may or may not be inventory still in stock.
CF (Contact Factory) - the part is still active but customers should check with the factory for availability. Longer lead-times may apply.
PRE (Pre-introduction) - the part has not been introduced or the part number is an early version available for sample only.
OBS (Obsolete) - the part is no longer being manufactured and may not be ordered.
NRND (Not Recommended for New Designs) - the part is not recommended for new designs.


Pkg Code Details Quantities Dimensions PDF
  • JEDEC Reference: MS-012
  • MSL Pb-Free: L1 @ 260ºC
  • MSL SnPb Eutectic: n/a
  • ThetaJA: 128.4ºC/W (std); 96.8ºC/W (fused)
  • Bulk Pack Style: Tube
  • Quantity per Bulk Pack: 98
  • Quantity per Reel: 2500
  • Quantity per Tube: 98
  • Quantity per Tray: n/a
  • Reel Size (Dia. x Width x Pitch): 330 x 12 x 8
  • Tape & Reel Unit Orientation: Quadrant 1
  • Dimensions: mm
  • Length: 4.90
  • Width: 3.90
  • Thickness: 1.75
  • Lead Pitch: 1.27


Distribution Date Description File
02/23/2017 Qualification of alternate assembly subcon, ANST, China.
02/15/2017 Qualification of alternate assembly subcon, ANST.
07/26/2016 Product discontinuation notification. Discontinued.
04/13/2016 Qualification of alternate assembly subcon, JCET.
07/02/2013 Qualification of an alternate qualified assembly supplier, ASE Chung-Li (Taiwan) for the 8L NSOIC package using copper wire bonding. Material change and alternate assembly supplier qualified.
03/23/2010 Alternate qualified assembly supplier Capacity enhancement
12/07/2009 Enhancement of NSOIC 8, NSOIC14 and NSOIC16 packages to Green (halogen-free) via Mold Compound & Die Attach Material. Enhance packages to be Green (halogen-free).
03/04/2009 Notice of Obsolescence Discontinued by Exar Corporation due to low market demand
02/28/2007 Product Obsolescence Letter and Discontinuation Notification. Discontinued.
02/02/2006 Announcing transfer of certain Power Management and Interface Products from Hillview fabrication and facility to wafer foundary Silan. See attached Product List Power Management and Interface products as listed are being transfer to external wafer foundry, due to cessation of operations of the sipex Hillview Fabrication manufacturing site

FAQs & Support

Search our list of FAQs for answers to common technical questions.
For material content, environmental, quality and reliability questions review the Quality tab or visit our Quality page.
For ordering information and general customer service visit our Contact Us page.

Submit a Technical Support Question As a New Question

Yes. Try our Excel-based heat calculation spreadsheet ANP-03, Thermal Calculator
For further study, this spreadsheet is mentioned in the following helpful application note: ANP-02, Thermal Considerations for Linear Regulators 

The best way to determine this is to go to maxlinear.com and type the part into the search function. At or near the top of the results you should see something that looks like:

In this example, we looked for XRA1201. Click on part number header or on the link at the bottom of the result.  This brings you to the product page. For example:


Click on Parts & Purchasing, highlighted with the blue arrow above. The screen changes to:


Notice the status column and the “Show obsolete parts” link.  A legend tells you the definition of the different statuses. Click on the “Show obsolete parts” link to see EOL or OBS part numbers along with the Active part numbers, the legend still present:


Another method to find out if a part is OBS or EOL is to click on SUPPORT at the top:


And then Product Change Notifications:


Type the part into the search, and click on one of the part numbers from the drop down menu. Then you can look for the Product Discontinuation Notice, which generally is at the top of the list, for example:


If you see this, it tells you that this particular orderable part has been discontinued and when the last order date is, or was. If you click on the file, then you can view the notice we sent about this if you purchased the part in the recent past. It may also advise of a replacement part. When an orderable part first becomes discontinued, Product Discontinuation Notices are sent are sent to those who have purchased the parts in the recent past, if purchased directly, with a dated opportunity to place a last order.