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Product details

Parameters

Output options Fixed Output Iout (Max) (A) 0.1 Vin (Max) (V) 16 Vin (Min) (V) 2.2 Vout (Max) (V) 5 Vout (Min) (V) 2.8 Fixed output options (V) 2.8, 2.9, 3, 3.3, 5 Noise (uVrms) 160 Iq (Typ) (mA) 0.065 Thermal resistance θJA (°C/W) 205 Load capacitance (Min) (µF) 2.2 Rating Catalog Regulated outputs (#) 1 Features Enable Accuracy (%) 6 PSRR @ 100 KHz (dB) 41 Dropout voltage (Vdo) (Typ) (mV) 200 Operating temperature range (C) -40 to 125 open-in-new Find other Linear regulators (LDO)

Package | Pins | Size

SOT-23 (DBV) 5 5 mm² 2.9 x 1.6 open-in-new Find other Linear regulators (LDO)

Features

  • Output Tolerance of
    • 0.75% (A Grade)
    • 1.25% (Standard Grade)
  • Ultra-Low Dropout Typically:
    • 200 mV at Full Load of 100 mA
    • 7 mV at 1 mA
  • Low IQ: 600 µA Typical at Full Load of 100 mA
  • Shutdown Current: 0.01 µA Typical
  • Fast Transient Response to Line and Load
  • Overcurrent and Thermal Protection
  • High Peak Current Capability
  • Low ZOUT Over Wide Frequency Range
  • –40°C to 125°C Temperature Range
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Description

The LP2981 and LP2981A families of fixed-output, low-dropout regulators offer exceptional, cost-effective performance for both portable and non-portable applications. Available in fixed voltages of 2.8 V, 3 V, 3.3 V, and 5 V, the family has an output tolerance of 0.75% for the A-grade devices (1.25% for the standard grade) and is capable of delivering 100-mA continuous load current. Standard regulator features, such as overcurrent and overtemperature protection, are included.

The LP2981 and LP2981A have features that make the regulators ideal candidates for a variety of portable applications:

  • Low dropout: A PNP pass element allows a typical dropout of 200 mV at 100-mA load current and 7 mV at 1-mA load.
  • Low quiescent current: The use of a vertical PNP process allows for quiescent currents that are considerably lower than those associated with traditional lateral PNP regulators.
  • Shutdown: A shutdown feature is available, allowing the regulator to consume only 0.01 µA when the ON/OFF pin is pulled low.
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Technical documentation

= Top documentation for this product selected by TI
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Type Title Date
* Datasheet LP2981 100-mA Ultra-Low Dropout Regulators With Shutdown datasheet (Rev. G) Aug. 31, 2016
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 Isolated power supply, low-noise circuit: 5V, 100mA (Rev. A) Mar. 07, 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
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
User guides Universal Low-Dropout (LDO) Linear Voltage Regulator EVM User's Guide Oct. 12, 2016
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-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 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
More literature LP2981/85 Product Clip Sep. 09, 2004
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

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
Description

The MULTIPKGLDOEVM-823 evaluation module (EVM) helps you evaluate the operation and performance of several common packages of linear regulators for possible use in circuit applications. This particular EVM configuration has a DRB, DRV, DQN and DBV footprint for you to solder and (...)

Features
  • Supports almost all low-dropout (LDO) linear regulators in DBV, DRB, DRV and DQN packages

Design tools & simulation

SIMULATION TOOLS Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)

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

CAD/CAE symbols

Package Pins Download
SOT-23 (DBV) 5 View options

Ordering & quality

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