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  • LM27761 Low-Noise, Regulated, Switched-Capacitor Voltage Inverter

    • SNVSA85C October   2015  – January 2017 LM27761

      PRODUCTION DATA.  

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  • LM27761 Low-Noise, Regulated, Switched-Capacitor Voltage Inverter
  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Typical Application
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1.     Pin 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
    6. 6.6 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 Undervoltage Lockout
      2. 7.3.2 Input Current Limit
      3. 7.3.3 PFM Operation
      4. 7.3.4 Output Discharge
      5. 7.3.5 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Shutdown Mode
      2. 7.4.2 Enable Mode
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application - Regulated Voltage Inverter
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Custom Design With WEBENCH® Tools
        2. 8.2.2.2 Charge-Pump Voltage Inverter
        3. 8.2.2.3 Negative Low-Dropout Linear Regulator
        4. 8.2.2.4 Power Dissipation
        5. 8.2.2.5 Output Voltage Setting
        6. 8.2.2.6 External Capacitor Selection
          1. 8.2.2.6.1 Charge-Pump Output Capacitor
          2. 8.2.2.6.2 Input Capacitor
          3. 8.2.2.6.3 Flying Capacitor
          4. 8.2.2.6.4 LDO Output Capacitor
      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 Device Support
      1. 11.1.1 Development Support
        1. 11.1.1.1 Custom Design With WEBENCH® Tools
    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
  13. IMPORTANT NOTICE
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DATA SHEET

LM27761 Low-Noise, Regulated, Switched-Capacitor Voltage Inverter

1 Features

  • Inverts and Regulates the Input Supply Voltage
  • Low Output Ripple
  • Shutdown Lowers Quiescent Current to 7 µA (Typical)
  • Up to 250-mA Output Current
  • 2.5-Ω Inverter Output Impedance, VIN = 5 V
  • ±4% Regulation at Peak Load
  • 370-µA Quiescent Current
  • 2-MHz (Typical) Low-Noise Fixed-Frequency Operation
  • 35-dB (Typical) LDO PSRR at 2 MHz
    With 80-mA Load Current
  • 30-mV LDO Dropout Voltage at 100 mA,
    VOUT = –5 V
  • Current Limit and Thermal Protection
  • Create a Custom Design Using the LM27761 With the WEBENCH® Power Designer

2 Applications

  • Operational Amplifier Power
  • Wireless Communication Systems
  • Cellular-Phone Power-Amplifier Biasing
  • Interface Power Supplies
  • Handheld Instrumentation
  • Hi-Fi Headphone Amplifiers
  • Powering Data Converters

 
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