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Product details

Parameters

Output options Adjustable Output, Fixed Output Iout (Max) (A) 0.1 Vin (Max) (V) 30 Vin (Min) (V) 2 Vout (Max) (V) 29 Vout (Min) (V) 1.2 Fixed output options (V) 3, 3.3, 5 Noise (uVrms) 160 Iq (Typ) (mA) 0.075 Thermal resistance θJA (°C/W) 52 Load capacitance (Min) (µF) 1 Rating Catalog Regulated outputs (#) 1 Features Enable, Power Good Accuracy (%) 3 PSRR @ 100 KHz (dB) 57 Dropout voltage (Vdo) (Typ) (mV) 380 Operating temperature range (C) -40 to 125 open-in-new Find other Linear regulators (LDO)

Package | Pins | Size

SOIC (D) 8 19 mm² 3.91 x 4.9 WSON (DRG) 8 9 mm² 3 x 3 open-in-new Find other Linear regulators (LDO)

Features

  • Wide Input Range: Up to 30 V
  • Rated Output Current of 100 mA
  • Low Dropout: 380 mV (Typ) at 100 mA
  • Low Quiescent Current: 75 µA (Typ)
  • Tight Line Regulation: 0.03% (Typ)
  • Tight Load Regulation: 0.04% (Typ)
  • High VO Accuracy
    • 1.4% at 25°C
    • 2% Over Temperature
  • Can Be Used as a Regulator or Reference
  • Stable With Low ESR (>12 mΩ) Capacitors
  • Current- and Thermal-Limiting Features
  • LP2950 Only (3-Pin)
    • Fixed-Output Voltages of 5 V, 3.3 V, and 3 V
  • LP2951 Only (8-Pin Package)
    • Fixed- or Adjustable-Output Voltages:
      5 V/ADJ, 3.3 V/ADJ, and 3 V/ADJ
    • Low-Voltage Error Signal on Falling Output
    • Shutdown Capability
    • Remote Sense Capability for Optimal Output
      Regulation and Accuracy
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Description

The LP2950 and LP2951 devices are bipolar, low-dropout voltage regulators that can accommodate a wide input supply-voltage range of up to 30 V. The easy-to-use, 3-pin LP2950 is available in fixed-output voltages of 5 V, 3.3 V, and 3 V. However, the 8-pin LP2951 is able to output either a fixed or adjustable output from the same device. By tying the OUTPUT and SENSE pins together, and the FEEDBACK and VTAP pins together, the LP2951 outputs a fixed 5 V, 3.3 V, or 3 V (depending on the version). Alternatively, by leaving the SENSE and VTAP pins open and connecting FEEDBACK to an external resistor divider, the output can be set to any value between 1.235 V to 30 V.

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LP2950 ACTIVE 100-mA, 30-V, low-dropout voltage regulator with low IQ Has lower pin count and fixed voltage option
TPS7A25 ACTIVE 300-mA, 18-V, ultra-low-IQ, high-accuracy, adjustable low-dropout voltage regulator with power good This is a higher output (300-mA) LDO with power good and lower IQ (2.5 μA)

Technical documentation

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Type Title Date
* Datasheet LP295x Adjustable Micropower Voltage Regulators with Shutdown datasheet (Rev. I) Nov. 12, 2014
Application note LDO Noise Demystified (Rev. B) Aug. 18, 2020
Application note L1 and L2 EV Charger Electric Vehicle Service Equipment Design Considerations (Rev. A) Apr. 14, 2020
Application note ESR, Stability, and the LDO Regulator (Rev. A) Jan. 07, 2020
Application note A Topical Index of TI LDO Application Notes (Rev. F) Jun. 27, 2019
Application note Fundamental Theory of PMOS LDO Voltage Regulators (Rev. A) Aug. 17, 2018
Technical article LDO basics: capacitor vs. capacitance Aug. 01, 2018
Technical article LDO Basics: Preventing reverse current Jul. 25, 2018
Technical article LDO basics: introduction to quiescent current Jun. 20, 2018
User guide LP2951 EVM User's Guide (Rev. A) Jan. 05, 2018
Application note LDO PSRR Measurement Simplified (Rev. A) Aug. 09, 2017
Technical article LDO basics: noise – part 1 Jun. 14, 2017
Application note A Topical Index of TI Supply Voltage Supervisor (SVS) Application Notes Jun. 15, 2015
Application note Techniques for accurate PSRR measurements Oct. 28, 2013
Application note AN-1028 Maximum Power Enhancement Techniques for Power Packages (Rev. B) May 06, 2013
Application note AN-1482 LDO Regulator Stability Using Ceramic Output Capacitors (Rev. A) Apr. 25, 2013
Application note AN-1815 LDOs Ease the Stress of Start-Up (Rev. A) Apr. 24, 2013
Application note AN-1061 Power Conversion in Line-Powered Equipment (Rev. B) Apr. 23, 2013
Application note AN-1950 Silently Powering Low Noise Applications (Rev. A) Apr. 22, 2013
Application note LDO Performance Near Dropout Oct. 08, 2010
Application note 3.6V – 5.5V Input, LDO Reference Design for MSP430 (Rev. A) Jun. 14, 2010
Application note 3.6V – 5.5V Input, LDO with Dual-Level Output Reference Design for MSP430 (Rev. A) Jun. 14, 2010
Application note Packaging Limits Range of Linear Regulators May 08, 2010
Application note Simple Power Solution Using LDOs for the DM365 (Rev. A) Sep. 11, 2009
Application note Digital Designer's Guide to Linear Voltage Regulators & Thermal Mgmt (LDO) (Rev. A) Jun. 04, 2008
Application note Low-Voltage Current Loop Transmitter Aug. 02, 2007
Application note Battery Charging Mar. 21, 2007
Application note Linear and Switching Voltage Regulator Fundamental Part 1 Mar. 21, 2007
Application note Ceramic Capacitors Replace Tantalum Capacitors in LDOs (Rev. A) Oct. 13, 2006
Application note Understanding LDO Dropout May 09, 2005
White paper Versatility of the LM5030 PWM Push-Pull Controller Dec. 01, 2003
Application note Extending the Input Voltage Range of an LDO Regulator Aug. 16, 2002
Application note Understanding the Terms and Definitions of LDO Voltage Regulators Oct. 21, 1999
Application note Technical Review of Low Dropout Voltage Regulator Operation And Performance Aug. 30, 1999
Application note Low Power 150-mA LDO Linear Regulators. Extended Output Voltage Adjustment Range Jun. 11, 1999

Design & development

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Hardware development

EVALUATION BOARD Download
document-generic User guide
20
Description
The LP2951 devices are bipolar low-dropout (LDO) voltage regulators that can accommodate a wide input supply-voltage range of up to 30 V with an output load up to 100 mA. The LP2951EVM allows for flexibility in design, allowing the user to add or remove input and output capacitors, as well as a (...)
Features
  • Small form factor
  • Designed for fixed- and adjustable-output voltage
  • 1.235-V to 29-V adjustable-output voltage
  • Landing patterns for additional input and output capacitors
  • Landing pattern for bypass capacitor

Design tools & simulation

SIMULATION MODEL Download
SNVM037A.ZIP (23 KB) - PSpice Model
SIMULATION MODEL Download
SNVMAO3.ZIP (1 KB) - PSpice Model

Reference designs

Many TI reference designs include the LP2951 Use our reference design selection tool to review and identify designs that best match your application and parameters.

CAD/CAE symbols

Package Pins Download
SOIC (D) 8 View options
SON (DRG) 8 View options

Ordering & quality

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  • Qualification summary
  • Ongoing reliability monitoring

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