SLVSEW8B August   2019  – December 2019 TPS66020 , TPS66021

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Function Table
      1.      TPS6602x Block Diagram
  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  Recommended Supply Load Capacitance
    5. 6.5  Thermal Information
    6. 6.6  PP5V Power Switch Characteristics
    7. 6.7  PPHV Power Switch Characteristics
    8. 6.8  Power Path Supervisory
    9. 6.9  VBUS LDO Characteristics
    10. 6.10 Thermal Shutdown Characteristics
    11. 6.11 Input-output (I/O) Characteristics
    12. 6.12 Power Consumption Characteristics
    13. 6.13 Typical Characteristics
  7. 7 Parameter Measurement Information
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 5-V Source (PP5V Power Path)
        1. 8.3.1.1 PP5V Current Limit
        2. 8.3.1.2 PP5V Reverse Current Protection (RCP)
      2. 8.3.2 20-V Sink (PPHV Power Path)
        1. 8.3.2.1 PPHV Soft Start
        2. 8.3.2.2 PPHV Reverse Current Protection (RCP)
      3. 8.3.3 Overtemperature Protection
      4. 8.3.4 VBUS Overvoltage Protection (OVP)
      5. 8.3.5 Power Management and Supervisory
        1. 8.3.5.1 Supply Connections
        2. 8.3.5.2 Power Up Sequences
          1. 8.3.5.2.1 Normal Power Up
          2. 8.3.5.2.2 Dead Battery Operation
    4. 8.4 Device Functional Modes
      1. 8.4.1 State Transitions
        1. 8.4.1.1 DISABLED State
        2. 8.4.1.2 SRC 1.5-A State
        3. 8.4.1.3 SRC 3-A State
        4. 8.4.1.4 SNK State
        5. 8.4.1.5 FRS (Fast Role Swap) State
      2. 8.4.2 SRC FAULT State
      3. 8.4.3 SNK FAULT State
      4. 8.4.4 Device Functional Mode Summary
      5. 8.4.5 Enabling the PP5V Source Path
      6. 8.4.6 Enabling the PPHV Sink Path
      7. 8.4.7 Fast Role Swap (FRS)
        1. 8.4.7.1 Overview
        2. 8.4.7.2 Fast Role Swap Use Cases
        3. 8.4.7.3 Fast Role Swap Sequence
      8. 8.4.8 Faults
        1. 8.4.8.1 Fault Types
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 External Current Reference Resistor (RIREF)
        2. 9.2.2.2 External VLDO Capacitor (CVLDO)
        3. 9.2.2.3 PP5V Power Path Capacitance
        4. 9.2.2.4 PPHV, VBUS Power Path Capacitance
        5. 9.2.2.5 VBUS TVS Protection (Optional)
        6. 9.2.2.6 VBUS Schottky Diode Protection (Optional)
        7. 9.2.2.7 VBUS Overvoltage Protection (Optional)
        8. 9.2.2.8 Dead Battery Support
        9. 9.2.2.9 Fast Role Swap (FRS) (Optional)
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Related Links
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Support Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

8.3.1.1 PP5V Current Limit

The current through PP5V to VBUS current limit may be dynamically selected to support 1.5-A or 3-A operation via EN0 and EN1. An external resistance to GND on IREF terminal is required to set the bias current for accurate current limit operation.

Under overload conditions, the internal current-limit regulator limits the output current to the selected current limit setting, ILIM_PP5V, where ILIM_PP5V is ILIM_PP5V_1P5 or ILIM_PP5V_3P0, as shown in the PP5V Power Switch Characteristics table. When an overload condition is present, the device maintains a constant output current, with the output voltage determined by (ILIM_PP5V x RLOAD ). Two possible overload conditions can occur. The first overload condition occurs when either: 1) PP5V input voltage is first applied, PP5V source path is enabled (EN1_EN0 = 10b or EN1_EN0 = 11b), and a short circuit is presented (load which draws IOUT > ILIM_PP5V), or 2) PP5V input voltage is present and the PP5V source path is enabled into a short circuit. The output voltage is held near zero potential with respect to ground and the TPS6602x ramps the output current to ILIM_PP5V. The TPS6602x limits the current to ILIM_PP5V until the overload condition is removed or the device begins to thermal cycle. This is demonstrated in Figure 31 where the device was enabled into a short, and subsequently cycles current off and on as the thermal protection engages.

The second condition is when an overload occurs while the PP5V source path is enabled and fully turned on. The device responds to the overload condition within time tOS_PP5V (see Figure 10) when the specified overload (per Electrical Characteristics) is applied. The response speed and shape vary with the overload level, input circuit and rate of application. The current-limit response varies between simply settling to ILIM_PP5V or turning off and a controlled return to ILIM_PP5V. Similar to the previous case, the TPS6602x limits the current to ILIM_PP5V until the overload condition is removed or the device begins to thermal cycle. The TPS6602x thermal cycles if an overload condition is present long enough to activate thermal limiting in any of the above cases. This is due to the relatively large power dissipation [(VPP5V – VVBUS) x ILIM_PP5V] elevating the junction temperature. The PP5V source path turns off when its temperature reaches its thermal shutdown temperature of TSD_PP5V_R while in current limit. The PP5V source path remains off until its temperature cools to TSD_PP5V_F and then re-enables automatically.