SLVSH68B June   2023  – June 2024 TPS543B25T

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  VIN Pins and VIN UVLO
      2. 6.3.2  Internal Linear Regulator and Bypassing
      3. 6.3.3  Enable and Adjustable UVLO
        1. 6.3.3.1 Internal Sequence of Events During Start-Up
      4. 6.3.4  Switching Frequency Selection
      5. 6.3.5  Switching Frequency Synchronization to an External Clock
        1. 6.3.5.1 Internal PWM Oscillator Frequency
        2. 6.3.5.2 Loss of Synchronization
        3. 6.3.5.3 Interfacing the SYNC/FSEL Pin
      6. 6.3.6  Remote Sense Amplifier and Adjusting the Output Voltage
      7. 6.3.7  Loop Compensation Guidelines
        1. 6.3.7.1 Output Filter Inductor Tradeoffs
        2. 6.3.7.2 Ramp Capacitor Selection
        3. 6.3.7.3 Output Capacitor Selection
        4. 6.3.7.4 Design Method for Good Transient Response
      8. 6.3.8  Soft Start and Prebiased Output Start-Up
      9. 6.3.9  MSEL Pin
      10. 6.3.10 Power Good (PG)
      11. 6.3.11 Output Overload Protection
        1. 6.3.11.1 Positive Inductor Current Protection
        2. 6.3.11.2 Negative Inductor Current Protection
      12. 6.3.12 Output Overvoltage and Undervoltage Protection
      13. 6.3.13 Overtemperature Protection
      14. 6.3.14 Output Voltage Discharge
    4. 6.4 Device Functional Modes
      1. 6.4.1 Forced Continuous-Conduction Mode
      2. 6.4.2 Discontinuous Conduction Mode During Soft Start
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Applications
      1. 7.2.1 1.0V Output, 1MHz Application
        1. 7.2.1.1 Design Requirements
        2. 7.2.1.2 Detailed Design Procedure
          1. 7.2.1.2.1  Custom Design With WEBENCH® Tools
          2. 7.2.1.2.2  Switching Frequency
          3. 7.2.1.2.3  Output Inductor Selection
          4. 7.2.1.2.4  Output Capacitor
          5. 7.2.1.2.5  Input Capacitor
          6. 7.2.1.2.6  Adjustable Undervoltage Lockout
          7. 7.2.1.2.7  Output Voltage Resistors Selection
          8. 7.2.1.2.8  Bootstrap Capacitor Selection
          9. 7.2.1.2.9  VDRV and VCC Capacitor Selection
          10. 7.2.1.2.10 PGOOD Pullup Resistor
          11. 7.2.1.2.11 Current Limit Selection
          12. 7.2.1.2.12 Soft-Start Time Selection
          13. 7.2.1.2.13 Ramp Selection and Control Loop Stability
          14. 7.2.1.2.14 MODE Pin
        3. 7.2.1.3 Application Curves
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
      3. 7.4.3 Thermal Performance
  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 Receiving Notification of Documentation Updates
    3. 8.3 Support Resources
    4. 8.4 Trademarks
    5. 8.5 Electrostatic Discharge Caution
    6. 8.6 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

4 Pin Configuration and Functions

TPS543B25T 17-Pin WQFN-FCRLF RYS Package (Bottom View)Figure 4-1 17-Pin WQFN-FCRLF RYS Package (Bottom View)
TPS543B25T 17-Pin WQFN-FCRLF RYS Package (Top View)Figure 4-2 17-Pin WQFN-FCRLF RYS Package
(Top View)
Table 4-1 Pin Functions
PinType(1)Description
NameNo.
AGND1—Ground return for internal analog circuits

VCC

2ISupply for analog control circuitry. Connect a 10Ω resistor from VDRV to this pin and bypass with a 0.1μF capacitor to AGND.
VDRV3OInternal 5V regulator output and internal connection to drivers. Bypass these pins with a 2.2μF capacitor to PGND. See Section 6.3.2.
VIN4, 9IInput power to the power stage. Low impedance bypassing of these pins to PGND is critical. A 1μF capacitor from each VIN to PGND close to the IC is required.
PGND5, 8, 16, 17—Ground return for the power stage. This pin is internally connected to the source of the low-side MOSFET.
SW6OSwitch node of the converter. Connect this pin to the output inductor.
BOOT7ISupply for the internal high-side MOSFET gate driver. Connect a capacitor from this pin to SW.
EN10IEnable pin. Float or tie high to enable, or enable and disable with an external signal, or adjust the input undervoltage lockout with a resistor divider. See Section 6.3.3.
PG11OOpen-drain power-good indicator. See Section 6.3.10.
SYNC/FSEL12IFrequency select and external clock synchronization. A resistor to ground sets the switching frequency of the device. An external clock can also be applied to this pin to synchronize the switching frequency. See Section 6.3.5.3.
MSEL13IA resistor to ground selects the current limit, soft-start rate, and PWM ramp amplitude. See Section 6.3.9.
GOSNS14IGround sense return and input to the differential remote sense amplifier
FB15IFeedback pin and input to the differential remote sense amplifier for output voltage regulation. Connect this pin to the midpoint of a resistor divider to set the output voltage. See Section 6.3.6.
(1) I = input, O = output