SLVS521G JULY   2004  – August 2016

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics: LP2981-xx
    6. 6.6 Electrical Characteristics: LP2981A-xx
    7. 6.7 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Ultra-Low Dropout Voltage
      2. 7.3.2 Low Ground Current
      3. 7.3.3 Short-Circuit Protection (Current Limit)
      4. 7.3.4 Capacitor Characteristics
        1. 7.3.4.1 Ceramic
        2. 7.3.4.2 Tantalum
        3. 7.3.4.3 Aluminum
    4. 7.4 Device Functional Modes
      1. 7.4.1 ON/OFF Operation
      2. 7.4.2 Reverse Input-Output Voltage
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 External Capacitors
          1. 8.2.2.1.1 Input Capacitor (Cin)
          2. 8.2.2.1.2 Output Capacitor (Cout)
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Related Links
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Community Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

パッケージ・オプション

メカニカル・データ（パッケージ｜ピン）
サーマルパッド・メカニカル・データ
発注情報

1 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

2 Applications

  • Smart Meters
  • Servo and Motor Control
  • Mobile Phones and Cameras
  • Audio and Portable Speakers
  • Telecommunication and Networking

3 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.

Device Information(1)

PART NUMBER PACKAGE (PINS) BODY SIZE (NOM)
LP2981-XXDBV
LP2981A-XXDBV		 SOT-23 (5) 2.90 mm × 1.60 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Block Diagram

LP2981-28 LP2981-29 LP2981-30 LP2981-33 LP2981-50 LP2981A-28 LP2981A-29 LP2981A-30 LP2981A-33 LP2981A-50 fb_lvs521.gif