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Linear & low-dropout (LDO) regulators

LP2951

ACTIVE

100-mA, 30-V, low-dropout voltage regulator with power good & enable

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Data sheet

LP2951

ACTIVE
Data sheet Order now

Product details

Rating Catalog Vin (max) (V) 30 Vin (min) (V) 2 Iout (max) (A) 0.1 Output options Adjustable Output, Fixed Output Vout (max) (V) 29 Vout (min) (V) 1.2 Fixed output options (V) 3, 3.3, 5 Noise (µVrms) 160 PSRR at 100 KHz (dB) 57 Iq (typ) (mA) 0.075 Features Enable, Power good Thermal resistance θJA (°C/W) 52, 97 Load capacitance (min) (µF) 1 Regulated outputs (#) 1 Accuracy (%) 3 Dropout voltage (Vdo) (typ) (mV) 380 Operating temperature range (°C) -40 to 125
Rating Catalog Vin (max) (V) 30 Vin (min) (V) 2 Iout (max) (A) 0.1 Output options Adjustable Output, Fixed Output Vout (max) (V) 29 Vout (min) (V) 1.2 Fixed output options (V) 3, 3.3, 5 Noise (µVrms) 160 PSRR at 100 KHz (dB) 57 Iq (typ) (mA) 0.075 Features Enable, Power good Thermal resistance θJA (°C/W) 52, 97 Load capacitance (min) (µF) 1 Regulated outputs (#) 1 Accuracy (%) 3 Dropout voltage (Vdo) (typ) (mV) 380 Operating temperature range (°C) -40 to 125
SOIC (D) 8 29.4 mm² 4.9 x 6 WSON (DRG) 8 9 mm² 3 x 3
  • Wide input voltage range
    • VIN range : 2V to 30V
  • Wide output voltage range VOUT
    • Fixed option: 3V (legacy Chip), 3.3V, 5.0V
    • Adjustable option: 1.2V to 29V
  • Output current: 100mA
  • VOUT accuracy:
    • ±2% over line, load, and temperature (legacy chip)
    • ±1% over line, load, and temperature (new chip)
  • Quiescent current IQ (new chip): 50µA (typical)
  • Low dropout (new chip):: 340mV (typical)
  • Output current limiting and thermal shutdown
  • Stable over a wide range of ceramic output capacitor values
    • COUT range: 1µF to 100µF (new chip)
    • ESR range: 0 to 2Ω (new chip)
  • Operating junction temperature: –40°C to 125°C
  • Package option:
    • LP (3-pin TO-92)
    • D (8-pin SOIC)
    • DRG (8-pin WSON)
  • Wide input voltage range
    • VIN range : 2V to 30V
  • Wide output voltage range VOUT
    • Fixed option: 3V (legacy Chip), 3.3V, 5.0V
    • Adjustable option: 1.2V to 29V
  • Output current: 100mA
  • VOUT accuracy:
    • ±2% over line, load, and temperature (legacy chip)
    • ±1% over line, load, and temperature (new chip)
  • Quiescent current IQ (new chip): 50µA (typical)
  • Low dropout (new chip):: 340mV (typical)
  • Output current limiting and thermal shutdown
  • Stable over a wide range of ceramic output capacitor values
    • COUT range: 1µF to 100µF (new chip)
    • ESR range: 0 to 2Ω (new chip)
  • Operating junction temperature: –40°C to 125°C
  • Package option:
    • LP (3-pin TO-92)
    • D (8-pin SOIC)
    • DRG (8-pin WSON)

The LP2951 is a wide input low-dropout regulator (LDO) supporting an input voltage range from 2V to 30V and can supply up to 100mA of load current. The 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 gives 3.3V or 5V fixed output voltages. Alternatively, leave the SENSE and VTAP pins open and connect FEEDBACK to an external resistor divider. This configuration allows the output to be set to any value between 1.2V to 29V.

The LP2951-Q1 has a ERROR output that monitors the voltage at the feedback pin to indicate the status of the output voltage. The SHUTDOWN input and ERROR output are used for sequencing multiple power supplies in the system.

The LP2951 is a wide input low-dropout regulator (LDO) supporting an input voltage range from 2V to 30V and can supply up to 100mA of load current. The 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 gives 3.3V or 5V fixed output voltages. Alternatively, leave the SENSE and VTAP pins open and connect FEEDBACK to an external resistor divider. This configuration allows the output to be set to any value between 1.2V to 29V.

The LP2951-Q1 has a ERROR output that monitors the voltage at the feedback pin to indicate the status of the output voltage. The SHUTDOWN input and ERROR output are used for sequencing multiple power supplies in the system.
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Technical documentation

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Top documentation Type Title Format options Date
* Data sheet LP295x 100-mA, 30-V, adjustable voltage regulator with shutdown datasheet (Rev. K) PDF | HTML 13 Dec 2024
Application note An empirical analysis of the impact of board layout on LDO thermal performance (Rev. A) PDF | HTML 23 Sep 2025
Application note L1 and L2 EV Charger Electric Vehicle Service Equipment Design Considerations (Rev. B) 09 Jun 2021
Application note LDO Noise Demystified (Rev. B) PDF | HTML 18 Aug 2020
Application note ESR, Stability, and the LDO Regulator (Rev. A) 07 Jan 2020
Application note A Topical Index of TI LDO Application Notes (Rev. F) 27 Jun 2019
E-book LDO Basics (Rev. A) 08 Apr 2019
Application note Fundamental Theory of PMOS LDO Voltage Regulators (Rev. A) 17 Aug 2018
Application note LDO PSRR Measurement Simplified (Rev. A) PDF | HTML 09 Aug 2017
Technical article LDO basics: dropout PDF | HTML 16 Mar 2017
Technical article How to use an LDO as a load switch PDF | HTML 01 Feb 2016
Technical article Two ways LDOs save power in the IoT PDF | HTML 17 Aug 2015
Technical article How to use an LDO to protect a power source PDF | HTML 25 Jul 2015
Application note A Topical Index of TI Supply Voltage Supervisor (SVS) Application Notes 15 Jun 2015
Analog Design Journal Techniques for accurate PSRR measurements 28 Oct 2013
Application note AN-1028 Maximum Power Enhancement Techniques for Power Packages (Rev. B) 06 May 2013
Application note AN-1482 LDO Regulator Stability Using Ceramic Output Capacitors (Rev. A) 25 Apr 2013
Application note AN-1815 LDOs Ease the Stress of Start-Up (Rev. A) 24 Apr 2013
Application note AN-1061 Power Conversion in Line-Powered Equipment (Rev. B) 23 Apr 2013
Application note AN-1950 Silently Powering Low Noise Applications (Rev. A) 22 Apr 2013
Application note LDO Performance Near Dropout 08 Oct 2010
Application note 3.6V – 5.5V Input, LDO Reference Design for MSP430 (Rev. A) 14 Jun 2010
Application note 3.6V – 5.5V Input, LDO with Dual-Level Output Reference Design for MSP430 (Rev. A) 14 Jun 2010
Application note Packaging Limits Range of Linear Regulators 08 May 2010
Application note Simple Power Solution Using LDOs for the DM365 (Rev. A) 11 Sep 2009
Application note Digital Designer's Guide to Linear Voltage Regulators & Thermal Mgmt (LDO) (Rev. A) 04 Jun 2008
Application note Low-Voltage Current Loop Transmitter 02 Aug 2007
Application note Battery Charging 21 Mar 2007
Application note Linear and Switching Voltage Regulator Fundamental Part 1 21 Mar 2007
Application note Ceramic Capacitors Replace Tantalum Capacitors in LDOs (Rev. A) 13 Oct 2006
Application note Understanding LDO Dropout 09 May 2005
White paper Versatility of the LM5030 PWM Push-Pull Controller 01 Dec 2003
Application note Extending the Input Voltage Range of an LDO Regulator 16 Aug 2002
Application note Understanding the Terms and Definitions of LDO Voltage Regulators 21 Oct 1999
Application note Technical Review of Low Dropout Voltage Regulator Operation And Performance 30 Aug 1999
Application brief Low Power 150-mA LDO Linear Regulators. Extended Output Voltage Adjustment Range 11 Jun 1999

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

LP2951EVM — LP2951 Fixed/Adjustable Micropower Low-Dropout (LDO) Regulator Evaluation Module

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 (...)
User guide: PDF
Not available on TI.com
Simulation model

LP2951 PSpice Transient Model (Rev. A)

SNVM037A.ZIP (23 KB) - PSpice Model
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Simulation model

LP2951 Unencrypted PSpice Transient Model

SNVMAO3.ZIP (1 KB) - PSpice Model
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Design guide: PDF
Schematic: PDF
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PMP20852 — 3W Isolated Triple Output Flyback Converter Reference Design

PMP20852 is an isolated flyback converter reference design with primary-side regulation using the UCC2805 controller IC. There are three independently isolated outputs on the secondary side, each of which use LP2951 linear regulators to provide a well-regulated 16V output on each of the three (...)
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Package Pins CAD symbols, footprints & 3D models
SOIC (D) 8 Ultra Librarian
WSON (DRG) 8 Ultra Librarian
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