SLVSI54 May   2025 TPS60800-Q1

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison Table
  6. 5 Pin Configuration and Functions
  7. 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
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Charge-Pump Output Resistance
      2. 7.3.2 Efficiency Considerations
    4. 7.4 Device Functional Modes
      1. 7.4.1 Active-Schottky Diode
  9. 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 Capacitor Selection
        2. 8.2.2.2 Input Capacitor (CI)
        3. 8.2.2.3 Flying Capacitor (C(fly))
        4. 8.2.2.4 Output Capacitor (CO)
        5. 8.2.2.5 Power Dissipation
      3. 8.2.3 Application Curve
    3. 8.3 System Examples
      1. 8.3.1 RC-Post Filter
      2. 8.3.2 Rail Splitter
      3. 8.3.3 Combined Doubler, Inverter
      4. 8.3.4 Cascading Devices
      5. 8.3.5 Paralleling Devices
      6. 8.3.6 Step-Down Charge Pump
    4. 8.4 Power Supply Recommendations
    5. 8.5 Layout
      1. 8.5.1 Layout Guidelines
      2. 8.5.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 Third-Party Products Disclaimer
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

8.3.3 Combined Doubler, Inverter

The application allows to generate a voltage rail at a level of –Vi as well as 2 × Vi (V(pos)) as shown in Figure 8-5.

Capacitors CI, C(fly), and CO form the inverter, while C1 and C2 form the doubler. C1 and C(fly) are the flying capacitors; CO and C2 are the output capacitors. Because both the inverter and doubler use part of the charge-pump circuit, loading either output causes both outputs to decline toward GND. Make sure the sum of the currents drawn from the two outputs does not exceed 200mA. The maximum output current at V(pos) must not exceed 100mA. If the negative output is loaded, this current must be further reduced.

TPS60800-Q1 TPS60800-Q1 as Doubler, Inverter Figure 8-5 TPS60800-Q1 as Doubler, Inverter