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LP2951-N

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

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

LP2951-N

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) 2.3 Vout (Max) (V) 29 Vout (Min) (V) 1.24 Fixed output options (V) 3, 3.3, 5 Noise (uVrms) 160 Iq (Typ) (mA) 0.075 Thermal resistance θJA (°C/W) 43 Approx. price (US$) 0.16 | 1ku Load capacitance (Min) (µF) 1 Rating Catalog Regulated outputs (#) 1 Features Enable, Power Good Accuracy (%) 2.5 PSRR @ 100 KHz (dB) 51 Dropout voltage (Vdo) (Typ) (mV) 380 Operating temperature range (C) -40 to 125 open-in-new Find other Linear regulators (LDO)

Package | Pins | Size

PDIP (P) 8 93 mm² 9.81 x 9.43 SOIC (D) 8 19 mm² 3.91 x 4.9 SOIC (D) 8 19 mm² 4.9 x 3.9 VSSOP (DGK) 8 15 mm² 3 x 4.9 WSON (NGT) 8 16 mm² 4 x 4 open-in-new Find other Linear regulators (LDO)

Features

  • Input Voltage Range: 2.3 V to 30 V
  • 5-V, 3-V, and 3.3-V Output Voltage Versions Available
  • High Accuracy Output Voltage
  • Ensured 100-mA Output Current
  • Extremely Low Quiescent Current
  • Low Dropout Voltage
  • Extremely Tight Load and Line Regulation
  • Very Low Temperature Coefficient
  • Use as Regulator or Reference
  • Needs Minimum Capacitance for Stability
  • Current and Thermal Limiting
  • Stable With Low-ESR Output Capacitors (10 mΩ to 6 Ω)
  • LP2951-N Versions Only:
    • Error Flag Warns of Output Dropout
    • Logic-Controlled Electronic Shutdown
    • Output Programmable From 1.24 V to 29 V

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Description

The LP2950-N and LP2951-N are micropower voltage regulators with very low quiescent current (75 µA typical) and very low dropout voltage (typical 40 mV at light loads and 380 mV at 100 mA). They are ideally suited for use in battery-powered systems. Furthermore, the quiescent current of the device increases only slightly in dropout, prolonging battery life.

Careful design of the LP2950-N/LP2951-N has minimized all contributions to the error budget. This includes a tight initial tolerance (0.5% typical), extremely good load and line regulation (0.05% typical) and a very low output voltage temperature coefficient, making the part useful as a low-power voltage reference.

One such feature is an error flag output which warns of a low output voltage, often due to falling batteries on the input. It may be used for a power-on reset. A second feature is the logic-compatible shutdown input which enables the regulator to be switched on and off. Also, the part may be pin-strapped for a 5-V, 3-V, or 3.3-V output (depending on the version), or programmed from 1.24 V to 29 V with an external pair of resistors.

The LP2950-N is available in the surface-mount TO-252 package and in the popular 3-pin TO-92 package for pin-compatibility with older 5-V regulators. The 8-pin LP2951-N is available in plastic, ceramic dual-in-line, WSON, or metal can packages and offers additional system functions.

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Exact equivalent in functionality and parametrics to the compared device:
LP2951 ACTIVE 100-mA, 30-V, low-dropout voltage regulator with power good & enable Pin-to-pin equivalent for cost-sensitive applications

Technical documentation

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Type Title Date
* Datasheet LP295x-N Series of Adjustable Micropower Voltage Regulators datasheet (Rev. Q) Dec. 08, 2017
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
Technical articles LDO basics: noise – part 1 Jun. 14, 2017
Application notes AN-1061 Power Conversion in Line-Powered Equipment (Rev. B) Apr. 23, 2013
More literature Die D/S LP2951 MDS Series of Adjustable Micropower Voltage Regs Dec. 20, 2012
More literature Die D/S LP2951C MWC Series Of Adj Micropower Voltage Regulators Sep. 28, 2012
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
White papers Versatility of the LM5030 PWM Push-Pull Controller Dec. 01, 2003

Design & development

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

Hardware development

EVALUATION BOARDS Download
document-generic User guide
$20.00
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
View details

Design tools & simulation

SIMULATION MODELS Download
SNVM037A.ZIP (23 KB) - PSpice Model
SIMULATION MODELS Download
SNVMAH9.ZIP (2 KB) - PSpice Model
SIMULATION MODELS Download
SNVMAI0.ZIP (2 KB) - PSpice Model
SIMULATION MODELS Download
SNVMAI1.ZIP (86 KB) - PSpice Model
SIMULATION MODELS Download
SNVMAI4.ZIP (87 KB) - PSpice Model
SIMULATION MODELS Download
SNVMAI5.ZIP (2 KB) - PSpice Model
SIMULATION MODELS Download
SNVMAI6.ZIP (80 KB) - PSpice Model
SIMULATION MODELS Download
SNVMAO3.ZIP (1 KB) - PSpice Model

Reference designs

REFERENCE DESIGNS Download
94.5% Efficiency, 500W industrial AC-DC reference design
TIDA-010015 — This reference design is a compact, high efficiency, 24-V DC, 500-W reference design for industrial AC/DC power supplies. This design consists of a front-end, two-phase interleaved transition mode (TM) power factor correction (PFC) based on the UCC28064A. This minimizes the PFC inductor size and (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
93% Efficiency, 400-W AC/DC reference design for avionics
PMP30763 — This is a compact, 30-V DC, 400-W reference design for avionics applications, accepting main frequencies between 400 Hz and 800 Hz. This design consists of a front-end, two-phase interleaved transition mode (TM) power factor correction (PFC) based on UCC28064A. This minimizes the PFC inductor size (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Compact, efficient, 24-V input auxiliary power supply reference design for servo drives
TIDA-010009 — This reference design showcases a method to generate power supplies required in a servo or AC drive including the analog and digtal I/O interfaces, encoder supply, isolated transceivers and digital processing block. This design also implements protection against input reverse polarity, output (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Active Integrator for Rogowski Coil Reference Design with Improved Accuracy for Relay and Breaker
TIDA-00777 — The TIDA-00777 TI Design shows an active integrator design that covers wide input current range for Rogowski Coil with excellent accuracy, linearity, stability and repeatability. The integrator uses a precision amplifier with very low offset and temperature drift. Two configurations of the (...)
document-generic Schematic

CAD/CAE symbols

Package Pins Download
PDIP (P) 8 View options
SOIC (D) 8 View options
VSSOP (DGK) 8 View options
WSON (NGT) 8 View options

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