SLVSHP9 July   2026 TPS544A28

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Related Products
  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  PMBus® Address (ADR) Pin
      6. 7.3.6  Output Voltage Setting
        1. 7.3.6.1 Setting VBOOT and VOUT_SCALE_LOOP
        2. 7.3.6.2 Setting Output Voltage (Internal Feedback)
        3. 7.3.6.3 Setting Output Voltage (External Feedback)
      7. 7.3.7  Switching Frequency
      8. 7.3.8  Dynamic Voltage Slew Rate
      9. 7.3.9  Enable
      10. 7.3.10 Soft Start and Soft Stop
      11. 7.3.11 Power Good
      12. 7.3.12 Overvoltage and Undervoltage Protection
      13. 7.3.13 Remote Sense
      14. 7.3.14 Low-side MOSFET Zero-Crossing
      15. 7.3.15 Current Sense and Positive Overcurrent Protection
      16. 7.3.16 Low-side MOSFET Negative Current Limit
      17. 7.3.17 Output Voltage Discharge
      18. 7.3.18 UVLO Protection
      19. 7.3.19 Telemetry
      20. 7.3.20 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 Register Map
      1. 8.1.1  OPERATION (Address = 01h)
      2. 8.1.2  ON_OFF_CONFIG (Address = 02h)
      3. 8.1.3  CLEAR_FAULTS (Address = 03h)
      4. 8.1.4  WRITE_PROTECT (Address = 10h)
      5. 8.1.5  STORE_USER_ALL (Address = 15h)
      6. 8.1.6  RESTORE_USER_ALL (Address = 16h)
      7. 8.1.7  CAPABILITY (Address = 19h)
      8. 8.1.8  VOUT_MODE (Address = 20h)
      9. 8.1.9  VOUT_COMMAND (Address = 21h)
      10.      57
      11. 8.1.10 VOUT_MARGIN_HIGH (Address = 25h)
      12. 8.1.11 VOUT_MARGIN_LOW (Address = 26h)
      13. 8.1.12 VOUT_TRANSITION_RATE (Address = 27h)
      14. 8.1.13 61
      15. 8.1.14 VOUT_SCALE_LOOP (Address = 29h)
      16. 8.1.15 FREQUENCY_SWITCH (Address = 33h)
      17. 8.1.16 64
      18. 8.1.17 VOUT_OV_FAULT_RESPONSE (Address = 41h)
      19. 8.1.18 VOUT_UV_FAULT_RESPONSE (Address = 45h)
      20. 8.1.19 IOUT_OC_FAULT_LIMIT (Address = 46h)
      21.      68
      22. 8.1.20 TON_DELAY (Address = 60h)
      23. 8.1.21 TON_RISE (Address = 61h)
      24.      71
      25. 8.1.22 TOFF_DELAY (Address = 64h)
      26. 8.1.23 TOFF_FALL (Address = 65h)
      27. 8.1.24 STATUS_BYTE (Address = 78h)
      28. 8.1.25 STATUS_WORD (Address = 79h)
      29. 8.1.26 STATUS_CML (Address = 7Eh)
      30. 8.1.27 STATUS_MFR_SPECIFIC (Address = 80h)
      31. 8.1.28 READ_VOUT (Address = 8Bh)
      32. 8.1.29 READ_IOUT (Address = 8Ch)
      33. 8.1.30 READ_TEMP1 (Address = 8Dh)
      34. 8.1.31 PMBUS_REVISION (Address = 98h)
      35. 8.1.32 MFR_ID (Address = 99h)
      36. 8.1.33 MFR_MODEL (Address = 9Ah)
      37. 8.1.34 MFR_REVISION (Address = 9Bh)
      38. 8.1.35 IC_DEVICE_ID (Address = ADh)
      39. 8.1.36 IC_DEVICE_REV (Address = AEh)
      40. 8.1.37 SYS_CFG_USER1 (Address = D1h)
      41. 8.1.38 PASSKEY (Address = D2h)
      42. 8.1.39 COMP (Address = D4h)
      43.      90
      44. 8.1.40 VBOOT (Address = D5h)
      45.      92
      46. 8.1.41 NVM_CHECKSUM (Address = D9h)
      47. 8.1.42 FUSION_ID0 (Address = FCh)
      48. 8.1.43 FUSION_ID1 (Address = FDh)
  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. 9.2.3 Application Curves
    3. 9.3 Power Supply Recommendations
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
      2. 9.4.2 Layout Example
      3. 9.4.3 Thermal Performance On TI EVM
  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

6.6 Typical Characteristics

TPS544A28 Efficiency with VOUT ≥ 3.3V
VIN=12V VCC = Internal FSW = 800kHz
LOUT = 470nH LDCR = 0.32mΩ FCCM
Figure 6-1 Efficiency with VOUT ≥ 3.3V
TPS544A28 Efficiency vs VCC Bias with VOUT = 1.25V
VIN=12V VOUT = 1.25V FSW = 800kHz
LOUT = 550nH LDCR = 1.4mΩ FCCM
Figure 6-3 Efficiency vs VCC Bias with VOUT = 1.25V
TPS544A28 Efficiency vs VIN with VOUT = 0.4V
VOUT = 0.4V VOUT = V FSW = 800kHz
LOUT = 330nH LDCR = 0.32mΩ PFM
Figure 6-5 Efficiency vs VIN with VOUT = 0.4V
TPS544A28 IQ(VIN) vs Junction Temperature
VIN = 12V VEN = 2V External 3.3V VCC
Non-switching, VFB = VINTREF + 50mV
Figure 6-7 IQ(VIN) vs Junction Temperature
TPS544A28 VCC LDO vs Junction Temperature
VIN = 12V IVCC = 30mA
Figure 6-9 VCC LDO vs Junction Temperature
TPS544A28 VREF vs Junction Temperature
VIN = 12V VREF = 500mV
Figure 6-11 VREF vs Junction Temperature
TPS544A28 Switching Frequency vs Duty Cycle
TAMB = 25°C FCCM IOUT = 5A
Duty Cycle = V O U T V I N
Figure 6-13 Switching Frequency vs Duty Cycle
TPS544A28 Switching Frequency vs Junction Temperature
VIN = 12V FSW = 600kHz IOUT = 0A
FCCM
Figure 6-15 Switching Frequency vs Junction Temperature
TPS544A28 Switching Frequency vs Junction Temperature
VIN = 12V FSW = 1000kHz IOUT = 0A
FCCM
Figure 6-17 Switching Frequency vs Junction Temperature
TPS544A28 Switching Frequency vs Junction Temperature
VIN = 12V FSW = 1400kHz IOUT = 0A
FCCM
Figure 6-19 Switching Frequency vs Junction Temperature
TPS544A28 RDSON(LS) vs Junction Temperature
VIN = 12V
Figure 6-21 RDSON(LS) vs Junction Temperature
TPS544A28 Output Voltage Telemetry Accuracy vs Junction Temperature
VIN = 12V Open-Loop Testing
Figure 6-23 Output Voltage Telemetry Accuracy vs Junction Temperature
TPS544A28 Efficiency with VOUT ≤ 1.2V
VIN=12V VCC = Internal FSW = 800kHz
LOUT = 150nH LDCR = 0.37mΩ FCCM
Figure 6-2 Efficiency with VOUT ≤ 1.2V
TPS544A28 Efficiency vs VIN with VOUT = 1.8V
VOUT = 1.8V VCC = Internal FSW = 800kHz
LOUT = 330nH LDCR = 0.32mΩ PFM
Figure 6-4 Efficiency vs VIN with VOUT = 1.8V
TPS544A28 IQ(VIN) vs Junction Temperature
VIN = 12V VEN = 2V Internal VCC LDO
Non-switching, VFB = VINTREF + 50mV
Figure 6-6 IQ(VIN) vs Junction Temperature
TPS544A28 IQ(VCC) vs Junction Temperature
VIN = 12V VEN = 2V External 3.3V VCC
Non-switching, VFB = VINTREF + 50mV
Figure 6-8 IQ(VCC) vs Junction Temperature
TPS544A28 VIN Pin Undervoltage Lockout vs Junction Temperature
VIN = 12V
Figure 6-10 VIN Pin Undervoltage Lockout vs Junction Temperature
TPS544A28 Internal Resistor Divider Accuracy vs Junction Temperature
VIN = 12V Open Loop Testing
Figure 6-12 Internal Resistor Divider Accuracy vs Junction Temperature
TPS544A28 Switching Frequency vs Junction Temperature
VIN = 12V FSW = 500kHz IOUT = 0A
FCCM
Figure 6-14 Switching Frequency vs Junction Temperature
TPS544A28 Switching Frequency vs Junction Temperature
VIN = 12V FSW = 800kHz IOUT = 0A
FCCM
Figure 6-16 Switching Frequency vs Junction Temperature
TPS544A28 Switching Frequency vs Junction Temperature
VIN = 12V FSW = 1200kHz IOUT = 0A
FCCM
Figure 6-18 Switching Frequency vs Junction Temperature
TPS544A28 RDSON(HS) vs Junction Temperature
VIN = 12V
Figure 6-20 RDSON(HS) vs Junction Temperature
TPS544A28 Low-Side Valley Current Limit Accuracy vs Junction Temperature
VIN = 12V
Figure 6-22 Low-Side Valley Current Limit Accuracy vs Junction Temperature
TPS544A28 Output Current Telemetry Accuracy vs Junction Temperature
VIN = 12V Open-Loop Testing
Figure 6-24 Output Current Telemetry Accuracy vs Junction Temperature