SLVSHP8 January   2026 TPS544B28

ADVANCE INFORMATION  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Options
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  D-CAP4 Control
      2. 7.3.2  Internal VCC LDO and Using External Bias On the VCC Pin
        1. 7.3.2.1 Powering the Device From a Single Bus
        2. 7.3.2.2 Powering the Device From a Split-Rail Configuration
      3. 7.3.3  Multifunction Select (MS1) Pin
      4. 7.3.4  Multifunction Select (MS2) Pin
      5. 7.3.5  Address (ADR) Pin
      6. 7.3.6  Enable
      7. 7.3.7  Soft Start
      8. 7.3.8  Power Good
      9. 7.3.9  Overvoltage and Undervoltage Protection
      10. 7.3.10 Output Voltage Setting (External Feedback Configuration)
      11. 7.3.11 Remote Sense
      12. 7.3.12 Low-side MOSFET Zero-Crossing
      13. 7.3.13 Current Sense and Positive Overcurrent Protection
      14. 7.3.14 Low-side MOSFET Negative Current Limit
      15. 7.3.15 Output Voltage Discharge
      16. 7.3.16 UVLO Protection
      17. 7.3.17 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Auto-Skip (PFM) Eco-mode Light Load Operation
      2. 7.4.2 Forced Continuous-Conduction Mode
  9. 8 Programming Registers
    1. 8.1  OPERATION (Address = 1h) [Reset = 00h]
    2. 8.2  ON_OFF_CONFIG (Address = 2h) [Reset = XXh]
    3. 8.3  CLEAR_FAULTS (Address = 3h) [Reset = 00h]
    4. 8.4  WRITE_PROTECT (Address = 10h) [Reset = 00h]
    5. 8.5  STORE_USER_ALL (Address = 15h) [Reset = 00h]
    6. 8.6  RESTORE_USER_ALL (Address = 16h) [Reset = 00h]
    7. 8.7  CAPABILITY (Address = 19h) [Reset = C0h]
    8. 8.8  VOUT_MODE (Address = 20h) [Reset = 96h]
    9. 8.9  VOUT_COMMAND (Address = 21h) [Reset = 0000h]
    10. 8.10 VOUT_MARGIN_HIGH (Address = 25h) [Reset = 0000h]
    11. 8.11 VOUT_MARGIN_LOW (Address = 26h) [Reset = 0000h]
    12. 8.12 VOUT_TRANSITION_RATE (Address = 27h) [Reset = E81Ah]
    13. 8.13 VOUT_SCALE_LOOP (Address = 29h) [Reset = E804h]
    14. 8.14 FREQUENCY_SWITCH (Address = 33h) [Reset = 380Xh]
    15. 8.15 VOUT_OV_FAULT_RESPONSE (Address = 41h) [Reset = XXh]
    16. 8.16 VOUT_UV_FAULT_RESPONSE (Address = 45h) [Reset = XXh]
    17. 8.17 IOUT_OC_FAULT_LIMIT (Address = 46h) [Reset = 00XXh]
    18. 8.18 TON_DELAY (Address = 60h) [Reset = 000Xh]
    19. 8.19 TON_RISE (Address = 61h) [Reset = F80Xh]
    20. 8.20 TOFF_DELAY (Address = 64h) [Reset = 000Xh]
    21. 8.21 TOFF_FALL (Address = 65h) [Reset = F80Xh]
    22. 8.22 STATUS_BYTE (Address = 78h) [Reset = 81h]
    23. 8.23 STATUS_WORD (Address = 79h) [Reset = 2800h]
    24. 8.24 STATUS_CML (Address = 7Eh) [Reset = 00h]
    25. 8.25 STATUS_MFR_SPECIFIC (Address = 80h) [Reset = 00h]
    26. 8.26 READ_VOUT (Address = 8Bh) [Reset = 0000h]
    27. 8.27 READ_IOUT (Address = 8Ch) [Reset = DXXXh]
    28. 8.28 READ_TEMP1 (Address = 8Dh) [Reset = 0XXXh]
    29. 8.29 PMBUS_REVISION (Address = 98h) [Reset = 55h]
    30. 8.30 MFR_ID (Address = 99h) [Reset = 4954h]
    31. 8.31 MFR_MODEL (Address = 9Ah) [Reset = 00284B54h]
    32. 8.32 MFR_REVISION (Address = 9Bh) [Reset = X0h]
    33. 8.33 IC_DEVICE_ID (Address = ADh) [Reset = 00284B544954h]
    34. 8.34 IC_DEVICE_REV (Address = AEh) [Reset = 00h]
    35. 8.35 SYS_CFG_USER1 (Address = D1h) [Reset = XXh]
    36. 8.36 PASSKEY (Address = D2h) [Reset = X0h]
    37. 8.37 COMP (Address = D4h) [Reset = XXh]
    38. 8.38 VBOOT (Address = D5h) [Reset = XXh]
    39. 8.39 NVM_CHECKSUM (Address = D9h) [Reset = 0000h]
    40. 8.40 FUSION_ID0 (Address = FCh) [Reset = 02C0h]
    41. 8.41 FUSION_ID1 (Address = FDh) [Reset = 4h]
  10. 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 Output Voltage Setting Point
        2. 9.2.2.2 Choose the Switching Frequency
        3. 9.2.2.3 Choose the Inductor
        4. 9.2.2.4 Choose the Output Capacitor
        5. 9.2.2.5 Choose the Input Capacitors (CIN)
        6. 9.2.2.6 VCC Bypass Capacitor
        7. 9.2.2.7 BOOT Capacitor
        8. 9.2.2.8 PG Pullup Resistor
        9. 9.2.2.9 Choose the PMBus® Address and Fault Recovery Mode
    3. 9.3 Power Supply Recommendations
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
      2. 9.4.2 Layout Example
  11. 10Device and Documentation Support
    1. 10.1 Documentation Support
      1. 10.1.1 Related Documentation
    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

3 Description

The TPS544B28 device is a small, high-efficiency, synchronous buck converter with an adaptive on-time D-CAP4 control mode. The control method provides low minimum on-time and fast load-transient response across the entire output voltage range without requiring an external compensation network.

The TPS544B28 device has differential remote sense, high-performance integrated MOSFETs, and supports ±1.25% output voltage accuracy with internal reference. The device features accurate load and line regulation and Eco-mode or Forced Continuous Conduction Mode (FCCM) operation.

The PMBus® interface with 1MHz clock support gives a convenient, standardized digital interface for device configuration as well as output voltage, output current, and die temperature telemetry. Pin strap options allow for the configuration of the overcurrent limit, fault response, internal or external feedback, output voltage selection, switching frequency, and compensation. Internal NVM is also available to store a variety of the PMBus parameters.

The TPS544B28 device is a lead-free device. The device is RoHS compliant without exemption.

Package Information
PART NUMBER PACKAGE(1) PACKAGE SIZE(2)
TPS544B28 VAN (WQFN-HR, 19) 3.00mm × 3.00mm
RBH (WQFN-HR, 19) 3.00mm × 3.50mm
(1) For more information, see Section 12.
(2) The package size (length × width) is a nominal value and includes pins, where applicable.
TPS544B28 Simplified SchematicSimplified Schematic
TPS544B28