SLVSH13 August   2024 TPSM83102

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 Rating
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics 
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Undervoltage Lockout (UVLO)
      2. 7.3.2 Enable and Soft Start
      3. 7.3.3 Adjustable Output Voltage
      4. 7.3.4 Reverse Current Operation
      5. 7.3.5 Protection Features
        1. 7.3.5.1 Input Overvoltage Protection
        2. 7.3.5.2 Short Circuit Protection
        3. 7.3.5.3 Thermal Shutdown
    4. 7.4 Device Functional Modes
    5. 7.5 Programming
      1. 7.5.1 Serial Interface Description
      2. 7.5.2 Standard-, Fast-, and Fast-Mode Plus Protocol
      3. 7.5.3 I2C Update Sequence
    6. 7.6 Register Map
      1. 7.6.1 Register Description
        1. 7.6.1.1 Register Map
        2. 7.6.1.2 Register CONTROL1 (Register address: 0x02; Default: 0x08)
        3. 7.6.1.3 Register VOUT (Register address: 0x03; Default: 0x5C)
        4. 7.6.1.4 Register CONTROL2 (Register address: 0x05; Default: 0x45)
  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 Custom Design with WEBENCH Tools
        2. 8.2.2.2 Output Capacitor Selection
        3. 8.2.2.3 Input Capacitor Selection
        4. 8.2.2.4 Setting the Output Voltage
      3. 8.2.3 Application Curves
  10. 9 Layout
    1. 9.1 Layout Guidelines
    2. 9.2 Layout Example
  11. 10Device and Documentation Support
    1. 10.1 Device Support
      1. 10.1.1 Third-Party Products Disclaimer
      2. 10.1.2 Development Support
        1. 10.1.2.1 Custom Design with WEBENCH Tools
    2. 10.2 Receiving Notification of Documentation Updates
    3. 10.3 Support Resources
    4. 10.4 Trademarks
    5. 10.5 Electrostatic Discharge Caution
    6. 10.6 Glossary
  12. 11Revision History
  13. 12Mechanical, Packaging, and Orderable Information
    1. 12.1 Tape and Reel Information
    2. 12.2 Mechanical Data

7.3.2 Enable and Soft Start

TPSM83102 TPSM83103 Typical Soft-Start BehaviorFigure 7-1 Typical Soft-Start Behavior

When the input voltage is above the UVLO rising threshold and the EN pin is pulled to a voltage above 1.2 V, the TPSM83102 and TPSM83103 are enabled and start up after a short delay time, td(EN).

The devices have an inductor peak current clamp to limit the inrush current during start-up. When the minimum current clamp (IL(lim_SS)) is lower than the current that is necessary to follow the voltage ramp, the current automatically increases to follow the voltage ramp. The minimum current limit ensures as fast as possible soft start if the capacitance is chosen lower than what the ramp time td(RAMP) was selected for.

In a typical start-up case as shown in Figure 7-1 (low output load, typical output capacitance), the minimum current clamp limits the inrush current and charges the output capacitor. The output voltage then rises faster than the reference voltage ramp (see phase A in Figure 7-1). To avoid an output overshoot, the current clamp is deactivated when the output is close to the target voltage and follows the reference voltage ramp slew value given by the voltage ramp, which is finishing the start up (see phase B in Figure 7-1). The transition from the minimum current clamp operation is sensed by using the threshold 95% Vout_target. After phase B, the output voltage is well regulated to the nominal target voltage. The current waveform depends on the output load and operation mode.