SLVSGM3B March   2023  – January 2024 TPS56836 , TPS56837 , TPS56838

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1  The Adaptive On-Time Control and PWM Operation
      2. 6.3.2  Mode Selection
      3. 6.3.3  Soft Start and Pre-Biased Soft Start
      4. 6.3.4  Enable and Adjusting Undervoltage Lockout
      5. 6.3.5  Output Overcurrent Limit and Undervoltage Protection
      6. 6.3.6  Overvoltage Protection
      7. 6.3.7  UVLO Protection
      8. 6.3.8  Thermal Shutdown
      9. 6.3.9  Output Voltage Discharge
      10. 6.3.10 Power Good
      11. 6.3.11 Large Duty Operation
    4. 6.4 Device Functional Modes
      1. 6.4.1 Standby Operation
      2. 6.4.2 Eco-mode
      3. 6.4.3 Forced Continuous Conduction Mode
      4. 6.4.4 Out-of-Audio™ Mode
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
        1. 7.2.2.1 Custom Design With WEBENCH® Tools
        2. 7.2.2.2 Output Voltage Resistors Selection
        3. 7.2.2.3 Output Filter Selection
        4. 7.2.2.4 Input Capacitor Selection
        5. 7.2.2.5 Bootstrap Capacitor Selection
      3. 7.2.3 Application Curves
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Device Support
      1. 8.1.1 Development Support
        1. 8.1.1.1 Custom Design With WEBENCH® Tools
    2. 8.2 Documentation Support
      1. 8.2.1 Related Documentation
    3. 8.3 Receiving Notification of Documentation Updates
    4. 8.4 Support Resources
    5. 8.5 Trademarks
    6. 8.6 Electrostatic Discharge Caution
    7. 8.7 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

Package Options

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

6.3.2 Mode Selection

TPS5683x has a MODE pin that can offer six different states of operation as a combination of switching frequency and low-side MOSFET valley current limit. The device reads the voltage on the MODE pin during start-up and latches onto one of the MODE options listed in Table 6-1. The voltage on the MODE pin can be set by connecting a resistor to AGND. A guideline for the MODE resistor in 1% resistors is shown in Table 6-1. The MODE pin setting can be reset only by a VIN or EN power cycling.

Table 6-1 MODE Pin Settings
MODE PinSwitching FrequencyOver Current Limit
R = 10kohm500kHzILIM-1 (Typ = 7.2A)
R = 30.1kohmILIM (Typ = 9.6A)
R = 102kohm800kHzILMI-1 (Typ = 7.2A)
R = 162kohmILIM (Typ = 9.6A)
R = 249kohm1200kHzILMI-1 (Typ = 7.2A)
R = 374kohmILIM (Typ = 9.6A)
Figure 6-1 shows the typical start-up sequence of the device once the enable signal triggers the EN turn-on threshold. After the voltage of internal VCC crosses the UVLO rising threshold, the MODE setting is read. After this process, the MODE is latched and does not change until VIN or EN toggles to restart-up this device. Then after a delay, the internal soft-start function begins to ramp up and Vout ramps up smoothly. When Vout is up to the reference voltage, PGOOD turns to high after a delay.
GUID-20240110-SS0I-CDQV-CZGG-VCGM2Q6KQP07-low.svgFigure 6-1 Power-Up Sequence