SLVSA67F February   2010  – April 2020 TPS62400-Q1 , TPS62402-Q1 , TPS62404-Q1 , TPS62405-Q1

UNLESS OTHERWISE NOTED, this document contains PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Simplified Schematic
      2.      TPS62402-Q1 Efficiency versus Output Current, VOUT1 and VOUT2
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
    1.     Pin Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Timing Requirements
    7. 7.7 Switching Characteristics
    8. 7.8 Typical Characteristics
  8. 8 Parameter Measurement Information
  9. 9 Detailed Description
    1. 9.1 Overview
      1. 9.1.1 Converter 1
      2. 9.1.2 Converter 2
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 Enable
      2. 9.3.2 DEF_1 Pin Function
      3. 9.3.3 180° Out-of-Phase Operation
      4. 9.3.4 Short-Circuit Protection
      5. 9.3.5 Thermal Shutdown
      6. 9.3.6 EasyScale Interface: One-Pin Serial Interface for Dynamic Output-Voltage Adjustment
        1. 9.3.6.1 General
        2. 9.3.6.2 Protocol
    4. 9.4 Device Functional Modes
      1. 9.4.1 Power-Save Mode
        1. 9.4.1.1 Dynamic Voltage Positioning
        2. 9.4.1.2 Soft Start
        3. 9.4.1.3 100% Duty-Cycle Low-Dropout Operation
        4. 9.4.1.4 Undervoltage Lockout
      2. 9.4.2 Mode Selection
    5. 9.5 Programming
      1. 9.5.1 Addressable Registers
        1. 9.5.1.1 Bit Decoding
        2. 9.5.1.2 Acknowledge
        3. 9.5.1.3 Mode Selection
  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 Output Voltage Setting
          1. 10.2.2.1.1 Converter 1 Adjustable Default Output-Voltage Setting: TPS62400-Q1
          2. 10.2.2.1.2 Converter 1 Fixed Default Output-Voltage Setting (TPS62402-Q1, TPS62404-Q1, and TPS62405-Q1)
          3. 10.2.2.1.3 Converter 2 Adjustable Default Output-Voltage Setting (TPS62400-Q1):
          4. 10.2.2.1.4 Converter 2 Fixed Default Output-Voltage Setting
        2. 10.2.2.2 Output Filter Design (Inductor and Output Capacitor)
          1. 10.2.2.2.1 Inductor Selection
          2. 10.2.2.2.2 Output-Capacitor Selection
          3. 10.2.2.2.3 Input Capacitor Selection
      3. 10.2.3 Application Curves
    3. 10.3 System Examples
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  13. 13Device and Documentation Support
    1. 13.1 Device Support
      1. 13.1.1 Third-Party Products Disclaimer
    2. 13.2 Related Links
    3. 13.3 Support Resources
    4. 13.4 Trademarks
    5. 13.5 Electrostatic Discharge Caution
    6. 13.6 Glossary
  14. 14Mechanical, Packaging, and Orderable Information

Package Options

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

9.4.1.1 Dynamic Voltage Positioning

This feature reduces the voltage under- and overshoots at load steps from light to heavy load and from heavy to light. Power-save-mode operation activates dynamic voltage positioning and provides more headroom for both the voltage drop at a load step and the voltage increase when a load is switched off, which improves load-transient behavior.

At light loads, in which the converter operates in PFM mode, the output voltage regulation is typically 1% higher than the nominal value. In case of a load transient from light load to heavy load, the output voltage drops until it reaches the skip comparator low threshold set to 2% below the nominal value and enters PWM mode. During a load transition from heavy load to light load, the device also minimizes voltage overshoot because of active regulation turning on the N-channel switch.

TPS62400-Q1 TPS62402-Q1 TPS62404-Q1 TPS62405-Q1 dyn_v_slvsa67.gifFigure 7. Dynamic Voltage Positioning