SLVSB70B October   2013  – July 2018 TPS62085 , TPS62086 , TPS62087

PRODUCTION DATA.  

  1. Features
  2. Applications
  3. Description
  4. Typical Application Schematic
    1.     Typical Application Efficiency
  5. Revision History
  6. Device Options
  7. Pin Configuration and Functions
    1.     Pin Functions
  8. Specifications
    1. 8.1 Absolute Maximum Ratings
    2. 8.2 ESD Ratings
    3. 8.3 Recommended Operating Conditions
    4. 8.4 Thermal Information
    5. 8.5 Electrical Characteristics
    6. 8.6 Typical Characteristics
  9. Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 Power Save Mode
      2. 9.3.2 100% Duty Cycle Low Dropout Operation
      3. 9.3.3 Soft Start
      4. 9.3.4 Switch Current Limit and Hiccup Short-Circuit Protection
      5. 9.3.5 Undervoltage Lockout
      6. 9.3.6 Thermal Shutdown
    4. 9.4 Device Functional Modes
      1. 9.4.1 Enable and Disable
      2. 9.4.2 Power Good
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
        1. 10.2.2.1 Custom Design With WEBENCH® Tools
        2. 10.2.2.2 Setting The Output Voltage
        3. 10.2.2.3 Output Filter Design
        4. 10.2.2.4 Inductor Selection
        5. 10.2.2.5 Capacitor Selection
      3. 10.2.3 Application Curves
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
    3. 12.3 Thermal Considerations
  13. 13Device and Documentation Support
    1. 13.1 Device Support
      1. 13.1.1 Third-Party Products Disclaimer
      2. 13.1.2 Custom Design With WEBENCH® Tools
    2. 13.2 Documentation Support
      1. 13.2.1 Related Documentation
    3. 13.3 Related Links
    4. 13.4 Community Resources
    5. 13.5 Trademarks
    6. 13.6 Electrostatic Discharge Caution
    7. 13.7 Glossary
  14. 14Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

100% Duty Cycle Low Dropout Operation

The devices offer low input-to-output voltage difference by entering 100% duty cycle mode. In this mode, the high-side MOSFET switch is constantly turned on and the low-side MOSFET is switched off. This is particularly useful in battery powered applications to achieve the longest operation time by taking full advantage of the whole battery voltage range. The minimum input voltage to maintain output regulation, depending on the load current and output voltage can be calculated as:

Equation 2. TPS62085 TPS62086 TPS62087 Eq_VIN_min_lvsae8.gif

where

  • VIN,MIN = Minimum input voltage to maintain an output voltage
  • IOUT,MAX = Maximum output current
  • RDS(on) = High-side FET ON-resistance
  • RL = Inductor ohmic resistance (DCR)