SNVSA85D October   2015  – October 2025 LM27761

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Undervoltage Lockout
      2. 6.3.2 Input Current Limit
      3. 6.3.3 PFM Operation
      4. 6.3.4 Output Discharge
      5. 6.3.5 Thermal Shutdown
    4. 6.4 Device Functional Modes
      1. 6.4.1 Shutdown Mode
      2. 6.4.2 Enable Mode
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Application - Regulated Voltage Inverter
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
        1. 7.2.2.1 Charge-Pump Voltage Inverter
        2. 7.2.2.2 Negative Low-Dropout Linear Regulator
        3. 7.2.2.3 Power Dissipation
        4. 7.2.2.4 Output Voltage Setting
        5. 7.2.2.5 External Capacitor Selection
          1. 7.2.2.5.1 Charge-Pump Output Capacitor
          2. 7.2.2.5.2 Input Capacitor
          3. 7.2.2.5.3 Flying Capacitor
          4. 7.2.2.5.4 LDO Output Capacitor
      3. 7.2.3 Application Curves
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Receiving Notification of Documentation Updates
    2. 8.2 Support Resources
    3. 8.3 Trademarks
    4. 8.4 Electrostatic Discharge Caution
    5. 8.5 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

3 Description

The LM27761 low-noise regulated switched-capacitor voltage inverter delivers a very low-noise adjustable output for an input voltage in the range of 2.7V to 5.5V. Four low-cost capacitors are used in the application design to provide up to 250mA of output current. The regulated output for the device is adjustable between −1.5V and −5V. The LM27761 operates at 2MHz (typical) switching frequency to reduce output resistance and voltage ripple. With an operating current of only 370µA (charge-pump power efficiency greater than 80% with most loads) and 7µA typical shutdown current, the LM27761 provides excellent performance when driving power amplifiers, DAC bias rails, and other high-current, low-noise voltage applications.

Package Information
PART NUMBERPACKAGE(1)PACKAGE SIZE(2)
LM27761DSG (WSON, 8)2.00mm × 2.00mm
(1) For more information, see Section 10.
(2) The package size (length × width) is a nominal value and includes pins, where applicable.
LM27761 Typical Application Typical Application