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  • LM2776 Switched Capacitor Inverter

    • SNVSA56B May   2015  – February 2017 LM2776

      PRODUCTION DATA.  

  • CONTENTS
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  • LM2776 Switched Capacitor Inverter
  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Typical Application
      2.      Output Impedance vs Input Voltage IOUT = 100 mA
  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 Switching Characteristics
    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 Input Current Limit
      2. 7.3.2 PFM Operation
      3. 7.3.3 Output Discharge
      4. 7.3.4 Thermal Shutdown
      5. 7.3.5 Undervoltage Lockout
    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 - Voltage Inverter
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Requirements
        1. 8.2.2.1 Efficiency
        2. 8.2.2.2 Power Dissipation
        3. 8.2.2.3 Capacitor Selection
        4. 8.2.2.4 Output Capacitor and Output Voltage Ripple
        5. 8.2.2.5 Input Capacitor
        6. 8.2.2.6 Flying Capacitor
      3. 8.2.3 Application Curve
  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 Third-Party Products Disclaimer
    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

LM2776 Switched Capacitor Inverter

1 Features

  • Input Voltage: 2.7 V to 5.5 V
  • 200-mA Output Current
  • Inverts Input Supply Voltage
  • Low-Current PFM Mode Operation
  • 2-MHz Switching Frequency
  • Greater than 90% Efficiency
  • Current Limit and Thermal Protection
  • No Inductors

2 Applications

  • Operational Amplifier Power Supplies
  • Interface Power Supplies
  • Data Converter Supplies
  • Audio Amplifier Power Supplies
  • Portable Electronic Devices

3 Description

The LM2776 CMOS charge-pump voltage converter inverts a positive voltage in the range from 2.7 V to 5.5 V to the corresponding negative voltage. The LM2776 uses three low-cost capacitors to provide 200 mA of output current without the cost, size, and electromagnetic interference (EMI) related to inductor-based converters.

With an operating current of only 100 μA and operating efficiency greater than 90% at most loads, the LM2776 provides ideal performance for battery-powered systems requiring a high power negative power supply.

The LM2776 has been placed in TI's 6-pin SOT-23 to maintain a small form factor.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
LM2776 SOT-23 (6) 2.90 mm × 1.60 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

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Device Images

Typical Application

LM2776 TYPAPP.gif

Output Impedance vs Input Voltage
IOUT = 100 mA

LM2776 D005_SNVSA56-LM2776.gif

4 Revision History

Changes from A Revision (February 2016) to B Revision

  • Added link for TIDA-01063 reference designGo

Changes from * Revision (May 2015) to A Revision

  • Changed Equation 1 from "ROUT = RSW..." to "ROUT = (2 × RSW)..."Go

5 Pin Configuration and Functions

DBV Package
6-Pin SOT
Top View
LM2776 pack.gif

Pin Functions

PIN TYPE DESCRIPTION
NUMBER NAME
1 VOUT Output/Power Negative voltage output.
2 GND Ground Power supply ground input.
3 VIN Input/Power Power supply positive voltage input.
4 EN Input Enable control pin, tie this pin high (EN = 1) for normal operation, and to GND (EN = 0) for shutdown.
5 C1+ Power Connect this pin to the positive terminal of the charge-pump capacitor.
6 C1- Power Connect this pin to the negative terminal of the charge-pump capacitor.

 
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