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LP2951

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

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

LP2951

ACTIVE
Data sheet Order now

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 Approx. price (US$) 0.16 | 1ku 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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Same functionality but is not pin-for-pin or parametrically equivalent to the compared device:
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 notes L1 and L2 EV Charger Electric Vehicle Service Equipment Design Considerations (Rev. A) Apr. 14, 2020
Application notes ESR, Stability, and the LDO Regulator (Rev. A) Jan. 07, 2020
Application notes A Topical Index of TI LDO Application Notes (Rev. F) Jun. 27, 2019
Application notes Fundamental Theory of PMOS LDO Voltage Regulators (Rev. A) Aug. 17, 2018
Technical articles LDO basics: capacitor vs. capacitance Aug. 01, 2018
Technical articles LDO Basics: Preventing reverse current Jul. 25, 2018
Technical articles LDO basics: introduction to quiescent current Jun. 20, 2018
User guides LP2951 EVM User's Guide (Rev. A) Jan. 05, 2018
Application notes LDO Noise Demystified (Rev. A) Aug. 09, 2017
Application notes LDO PSRR Measurement Simplified (Rev. A) Aug. 09, 2017
Technical articles LDO basics: noise – part 1 Jun. 14, 2017
Application notes A Topical Index of TI Supply Voltage Supervisor (SVS) Application Notes Jun. 15, 2015
Application notes Techniques for accurate PSRR measurements Oct. 28, 2013
Application notes AN-1028 Maximum Power Enhancement Techniques for Power Packages (Rev. B) May 06, 2013
Application notes AN-1482 LDO Regulator Stability Using Ceramic Output Capacitors (Rev. A) Apr. 25, 2013
Application notes AN-1815 LDOs Ease the Stress of Start-Up (Rev. A) Apr. 24, 2013
Application notes AN-1061 Power Conversion in Line-Powered Equipment (Rev. B) Apr. 23, 2013
Application notes AN-1950 Silently Powering Low Noise Applications (Rev. A) Apr. 22, 2013
Application notes LDO Performance Near Dropout Oct. 08, 2010
Application notes 3.6V – 5.5V Input, LDO Reference Design for MSP430 (Rev. A) Jun. 14, 2010
Application notes 3.6V – 5.5V Input, LDO with Dual-Level Output Reference Design for MSP430 (Rev. A) Jun. 14, 2010
Application notes Packaging Limits Range of Linear Regulators May 08, 2010
Application notes Simple Power Solution Using LDOs for the DM365 (Rev. A) Sep. 11, 2009
Application notes Digital Designer's Guide to Linear Voltage Regulators & Thermal Mgmt (LDO) (Rev. A) Jun. 04, 2008
Application notes Low-Voltage Current Loop Transmitter Aug. 02, 2007
Application notes Battery Charging Mar. 21, 2007
Application notes Linear and Switching Voltage Regulator Fundamental Part 1 Mar. 21, 2007
Application notes Ceramic Capacitors Replace Tantalum Capacitors in LDOs (Rev. A) Oct. 13, 2006
Application notes Understanding LDO Dropout May 09, 2005
White papers Versatility of the LM5030 PWM Push-Pull Controller Dec. 01, 2003
Application notes Extending the Input Voltage Range of an LDO Regulator Aug. 16, 2002
Application notes Understanding the Terms and Definitions of LDO Voltage Regulators Oct. 21, 1999
Application notes Technical Review of Low Dropout Voltage Regulator Operation And Performance Aug. 30, 1999
Application notes Low Power 150-mA LDO Linear Regulators. Extended Output Voltage Adjustment Range Jun. 11, 1999

Design & development

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Hardware development

EVALUATION BOARDS Download
document-generic User guide
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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
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Design tools & simulation

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

Reference designs

REFERENCE DESIGNS Download
Three-phase inverter reference design for 200-480 VAC drives with opto-emulated input gate drivers
TIDA-010025 — This reference design realizes a reinforced isolated three-phase inverter subsystem using isolated IGBT gate drivers and isolated current/voltage sensors. The UCC23513 gate driver used has a 6-pin wide body package with optical LED emulated inputs which enables its use as pin-to-pin replacement to (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
SAE J1772-compliant electric vehicle service equipment reference design for level 1 and 2 EV charger
TIDA-010071 — This reference design highlights an ultra-low standby isolated AC/DC auxiliary power stage followed by converters and linear regulators, a comparator-based control pilot interface to meet the SAE J1772 standard, an  efficient relay and contactor drive and isolated line voltage sensing across (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Small form factor 12-Vin, 1-Vout 40-A dual-phase synchronous buck reference design
PMP21872 — This reference design is a dual-phase synchronous buck solution using TPS53622 controller with two CSD95490Q5MC power-stage ICs. It takes a 12-V input and converts it to 1-V out at 40 A; 20 A per phase.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
3W Isolated Triple Output Flyback Converter Reference Design
PMP20852 — 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 rails (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
5.2W Primary-Side Regulated Flyback With 108V to 305V AC Input Reference Design
PMP30198 — The PMP30198 reference design uses the UCC28910 flyback controller with integrated MOSFET to generate two isolated outputs (18V@0.25A / 18V@0.04A) from an AC input. The UCC28910 implements primary-side regulation, eliminating the need for an opto-coupler and reducing the total component count.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Triple Output Isolated Fly-Buck Power Supply for Industrial Application Reference Design
PMP10516 — PMP10516 is an Isolated Flybuck Converter using the LM25017 regulator IC. The design accepts an input voltage of 20.4Vin to 28.8Vin (40Vin Max. Peak) and provides three isolated outputs. The +5Vout rail is regulated for precision using the LP2951 linear regulator.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Non-Synchronous Boost with Triple Outputs (3.3V@.03A)
PMP7833 — This is a non-synchronous boost converter with an input voltage range of 4.5V-to-5.5Vin and three regulated outputs: 12Vout @ 0.15A, 10.6Vout @ 0.1A, and 3.3Vout @ 0.03A
REFERENCE DESIGNS Download
Multi-output Multi-buck 20W Power Supply for Xilinx Zynq FPGA Applications Reference Design
PMP9335 — PMP9335 is designed for Xilinx Zynq FPGA applications utilizing the TPS84A20 and TPS84320. This design uses an external timer to synchronize the switching frequency to 300 kHz. It also employs a controlled power up and power down sequence.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
14Vin to 15.5Vin, 24Vout @ 8A Synchronous Boost Converter Reference Design
PMP9386 — PMP9385 is a synchronous dual-phase boost converter accepts an input voltage of 14V to 15.5V, and outputs 24V, capable of providing 8A of current to the load.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
High-Efficiency 4 Phase Synchronous Boost Conv for Automotive Trunk Amplifier App Reference Design
PMP7969 — PMP7969 is a very high efficiency 4 phase boost controller synchronizable to external clock. Light load efficiency is excellent due to phase shedding capability. Synchronous rectifier also improves efficiency. High effective switching frequency obtained with multiphase over single phase, and current (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Power Reference Design for Xilinx® Zynq®-7000
PMP7877 — The PMP7877 reference design provides all the rails necessary to power a Xilinx® Zynq®-7000 series SoC.  It operates from an input voltage range of 10.8Vin to 13.2Vin and has seven regulated outputs: 1Vout @ 5A, 1.8Vout @ 2.5A, 1.5Vout @ 6A, 3.3Vout @ 5A, 3.3Vout @ 5A, 5Vout @ 2A, and (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
30A SIMPLE SWITCHER® Power Module with 3 to 14.5V Reference Design with PMBus
PMP9464 — The reference design PMP9464 utilizes the LMZ31530, a 30A SIMPLE SWITCHER® Power Module. The LMZ31530 SIMPLE SWITCHER® power module is an easy-to-use integrated power solution that combines a 30-A DC/DC converter with power MOSFETs, a shielded inductor, and passives into a low profile, QFN package.

(...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Power Solution for an Engineering Equipment Fuel Injector
PMP7967 — The PMP7967 converts a DC input of 6V-42V to an output of 90V at 1.5A.  The design uses four interleaved LM5122 boost controllers with each controller switching at 100kHz. The resulting 4-phase boost converter has a ripple frequency of 400kHz. Freqeucny can also be synchronized to an external (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
7.5Vin to 10Vin; 11.5Vout @ 65A; 4-Phase Synchronous Boost Converter
PMP7937 — A 4-phase synchronous boost converter that accepts an input voltage of 7.5Vin to 10Vin and provides an output of 11.5Vout capable of delivering 65A.
Design files
View details
REFERENCE DESIGNS Download
10.8Vin to 13.2Vin; 48Vout @ 7.3A; 4-Phase Synchronous Boost Converter
PMP7944 — A 4-phase synchronous boost converter that accepts an input voltage of 10.8Vin to 13.2Vin providing an output of 48Vout capable of delivering 7.3A.
Design files
View details
REFERENCE DESIGNS Download
Power Solution for an Automotive Fuel Injector
PMP7966 — PMP7966 is a 4-phase boost converter rated for 52V output at 2.5A from an input voltage of 6V to 42V. This design uses LM5122 boost controllers at a switching frequency of 100 kHz each phase, resulting in 400 kHz input and output ripple. 680μF aluminum electrolytic capacitors are used at the (...)
document-generic Schematic document-generic User guide
Design files
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CAD/CAE symbols

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SOIC (D) 8 View options
SON (DRG) 8 View options

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Low-dropout linear voltage regulators (LDOs)

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Posted: 01-Jan-2019
Duration: 19:11

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