LP2951

100mA Low Dropout Voltage Regulator (LDOs)
Data Sheets Active
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Overview

Information 100mA Low Dropout Voltage Regulator (LDOs)
Output Option Fixed
VOUT (V) 3.3, 5
VOUT Adj MIN (V)
VOUT Adj MAX (V)
IOUT (mA) 100
VIN MIN (V) 2.4
VIN MAX (V) 30
IQ (µA) 150
Accuracy (%) 0.5%, 1%
Vdrop (mV) 380
Output Noise (µVRMS) 100
PSRR (dB) -
Junction Temp Range (°C) -40 to 125
Package NSOIC-8
Features Enable, Power Good, Current limit, thermal protection
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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

All Types Data Sheets Application Notes Product Briefs & Brochures
Type Title Version Date File Size
Data Sheets LP2950/LP2951 Data Sheet I June 2023 3.4 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 R01 November 2024 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
LP2951ACS-3-3 NSOIC8 OBS
LP2951ACS-3-3/TR NSOIC8 OBS
LP2951ACS-5-0 NSOIC8 OBS
LP2951ACS-5-0/TR NSOIC8 OBS
LP2951ACS-L-3-3 NSOIC8 OBS LP2951CS-L
LP2951ACS-L-3-3/TR NSOIC8 OBS LP2951CS-L
LP2951ACS-L-5-0 NSOIC8 OBS LP2951CS-L
LP2951ACS-L-5-0/TR NSOIC8 OBS LP2951CS-L
LP2951CS-3-3 NSOIC8 OBS
LP2951CS-3-3/TR NSOIC8 OBS
LP2951CS-5-0 NSOIC8 OBS
LP2951CS-5-0/TR NSOIC8 OBS
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.

Packaging

Pkg Code Details Quantities Dimensions
NSOIC8
  • 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

Notifications

Distribution Date Description File
07/17/2023 In 2023, MaxLinear will be converting all shipping labels for the parts noted from an EXAR format to MaxLinear’s label. During this transition customers may receive either label. This change affects only shipping and packing labels. This change will not affect the part number, part marking, manufacturing process or manufacturing sites. Only work in progress material will be converted. Existing inventory from MaxLinear’s warehouse, channel sales, distributor, and such, will not be converted. Hence, customers may experience receiving mixed shipments with both Exar and MaxLinear labels for some period until existing inventory of old labels is eventually cleared out. Situation is product to product with no predictable way to determine when all old labels will be exhausted. No change to product form, fit, function and reliability. ADDENDUM A: Fixed MBB label logo for DX204001 to MaxLinear logo. ADDENDUM B: Replaced ‘All other affected products outer box label’ with clearer pictures. Corrected Date Issued (from original PCN) issue date +90 days to August 30, 2023.
06/01/2023 In 2023, MaxLinear will be converting all shipping labels for the parts noted from an EXAR format to MaxLinear’s label. During this transition customers may receive either label. This change affects only shipping and packing labels. This change will not affect the part number, part marking, manufacturing process or manufacturing sites. Only work in progress material will be converted. Existing inventory from MaxLinear’s warehouse, channel sales, distributor, and such, will not be converted. Hence, customers may experience receiving mixed shipments with both Exar and MaxLinear labels for some period until existing inventory of old labels is eventually cleared out. Situation is product to product with no predictable way to determine when all old labels will be exhausted. No change to product form, fit, function and reliability.
06/01/2023 In 2023, MaxLinear will be converting all shipping labels for the parts noted from an EXAR format to MaxLinear’s label. During this transition customers may receive either label. This change affects only shipping and packing labels. This change will not affect the part number, part marking, manufacturing process or manufacturing sites. Only work in progress material will be converted. Existing inventory from MaxLinear’s warehouse, channel sales, distributor, and such, will not be converted. Hence, customers may experience receiving mixed shipments with both Exar and MaxLinear labels for some period until existing inventory of old labels is eventually cleared out. Situation is product to product with no predictable way to determine when all old labels will be exhausted. No change to product form, fit, function and reliability. ADDENDUM: Fixed MBB label logo for DX204001 to MaxLinear logo.
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

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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 
  

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