SLUSF28 November   2023 TPS546A24S

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  Average Current-Mode Control
        1. 6.3.1.1 On-Time Modulator
        2. 6.3.1.2 Current Error Integrator
        3. 6.3.1.3 Voltage Error Integrator
      2. 6.3.2  Linear Regulators
      3. 6.3.3  AVIN and PVIN Pins
      4. 6.3.4  Input Undervoltage Lockout (UVLO)
        1. 6.3.4.1 Fixed AVIN UVLO
        2. 6.3.4.2 Fixed VDD5 UVLO
        3. 6.3.4.3 Programmable PVIN UVLO
        4. 6.3.4.4 EN/UVLO Pin
      5. 6.3.5  Start-Up and Shutdown
      6. 6.3.6  Differential Sense Amplifier and Feedback Divider
      7. 6.3.7  Set Output Voltage and Adaptive Voltage Scaling (AVS)
        1. 6.3.7.1 Reset Output Voltage
        2. 6.3.7.2 Soft Start
      8. 6.3.8  Prebiased Output Start-Up
      9. 6.3.9  Soft Stop and (65h) TOFF_FALL Command
      10. 6.3.10 Power Good (PGOOD)
      11. 6.3.11 Set Switching Frequency
      12. 6.3.12 Frequency Synchronization
      13. 6.3.13 Loop Follower Detection
      14. 6.3.14 Current Sensing and Sharing
      15. 6.3.15 Telemetry
      16. 6.3.16 Overcurrent Protection
      17. 6.3.17 Overvoltage/Undervoltage Protection
      18. 6.3.18 Overtemperature Management
      19. 6.3.19 Fault Management
      20. 6.3.20 Back-Channel Communication
      21. 6.3.21 Switching Node (SW)
      22. 6.3.22 PMBus General Description
      23. 6.3.23 PMBus Address
      24. 6.3.24 PMBus Connections
    4. 6.4 Device Functional Modes
      1. 6.4.1 Programming Mode
      2. 6.4.2 Standalone, Loop Controller, Loop Follower Mode Pin Connections
      3. 6.4.3 Continuous Conduction Mode
      4. 6.4.4 Operation With CNTL Signal (EN/UVLO)
      5. 6.4.5 Operation with (01h) OPERATION Control
      6. 6.4.6 Operation with CNTL and (01h) OPERATION Control
    5. 6.5 Programming
      1. 6.5.1 Supported PMBus Commands
      2. 6.5.2 Pin Strapping
        1. 6.5.2.1 Programming MSEL1
        2. 6.5.2.2 Programming MSEL2
        3. 6.5.2.3 Programming VSEL
        4. 6.5.2.4 Programming ADRSEL
        5. 6.5.2.5 Programming MSEL2 for a Loop Follower Device (GOSNS Tied to BP1V5)
        6. 6.5.2.6 Pin-Strapping Resistor Configuration
    6. 6.6 Register Maps
      1. 6.6.1  Conventions for Documenting Block Commands
      2. 6.6.2  (01h) OPERATION
      3. 6.6.3  (02h) ON_OFF_CONFIG
      4. 6.6.4  (03h) CLEAR_FAULTS
      5. 6.6.5  (04h) PHASE
      6. 6.6.6  (10h) WRITE_PROTECT
      7. 6.6.7  (15h) STORE_USER_ALL
      8. 6.6.8  (16h) RESTORE_USER_ALL
      9. 6.6.9  (19h) CAPABILITY
      10. 6.6.10 (1Bh) SMBALERT_MASK
      11. 6.6.11 (1Bh) SMBALERT_MASK_VOUT
      12. 6.6.12 (1Bh) SMBALERT_MASK_IOUT
      13. 6.6.13 (1Bh) SMBALERT_MASK_INPUT
      14. 6.6.14 (1Bh) SMBALERT_MASK_TEMPERATURE
      15. 6.6.15 (1Bh) SMBALERT_MASK_CML
      16. 6.6.16 (1Bh) SMBALERT_MASK_OTHER
      17. 6.6.17 (1Bh) SMBALERT_MASK_MFR
      18. 6.6.18 (20h) VOUT_MODE
      19. 6.6.19 (21h) VOUT_COMMAND
      20. 6.6.20 (22h) VOUT_TRIM
      21. 6.6.21 (24h) VOUT_MAX
      22. 6.6.22 (25h) VOUT_MARGIN_HIGH
      23. 6.6.23 (26h) VOUT_MARGIN_LOW
      24. 6.6.24 (27h) VOUT_TRANSITION_RATE
      25. 6.6.25 (29h) VOUT_SCALE_LOOP
      26. 6.6.26 (2Bh) VOUT_MIN
      27. 6.6.27 (33h) FREQUENCY_SWITCH
      28. 6.6.28 (35h) VIN_ON
      29. 6.6.29 (36h) VIN_OFF
      30. 6.6.30 (37h) INTERLEAVE
      31. 6.6.31 (38h) IOUT_CAL_GAIN
      32. 6.6.32 (39h) IOUT_CAL_OFFSET
      33. 6.6.33 (40h) VOUT_OV_FAULT_LIMIT
      34. 6.6.34 (41h) VOUT_OV_FAULT_RESPONSE
      35. 6.6.35 (42h) VOUT_OV_WARN_LIMIT
      36. 6.6.36 (43h) VOUT_UV_WARN_LIMIT
      37. 6.6.37 (44h) VOUT_UV_FAULT_LIMIT
      38. 6.6.38 (45h) VOUT_UV_FAULT_RESPONSE
      39. 6.6.39 (46h) IOUT_OC_FAULT_LIMIT
      40. 6.6.40 (47h) IOUT_OC_FAULT_RESPONSE
      41. 6.6.41 (4Ah) IOUT_OC_WARN_LIMIT
      42. 6.6.42 (4Fh) OT_FAULT_LIMIT
      43. 6.6.43 (50h) OT_FAULT_RESPONSE
      44. 6.6.44 (51h) OT_WARN_LIMIT
      45. 6.6.45 (55h) VIN_OV_FAULT_LIMIT
      46. 6.6.46 (56h) VIN_OV_FAULT_RESPONSE
      47. 6.6.47 (58h) VIN_UV_WARN_LIMIT
      48. 6.6.48 (60h) TON_DELAY
      49. 6.6.49 (61h) TON_RISE
      50. 6.6.50 (62h) TON_MAX_FAULT_LIMIT
      51. 6.6.51 (63h) TON_MAX_FAULT_RESPONSE
      52. 6.6.52 (64h) TOFF_DELAY
      53. 6.6.53 (65h) TOFF_FALL
      54. 6.6.54 (78h) STATUS_BYTE
      55. 6.6.55 (79h) STATUS_WORD
      56. 6.6.56 (7Ah) STATUS_VOUT
      57. 6.6.57 (7Bh) STATUS_IOUT
      58. 6.6.58 (7Ch) STATUS_INPUT
      59. 6.6.59 (7Dh) STATUS_TEMPERATURE
      60. 6.6.60 (7Eh) STATUS_CML
      61. 6.6.61 (7Fh) STATUS_OTHER
      62. 6.6.62 (80h) STATUS_MFR_SPECIFIC
      63. 6.6.63 (88h) READ_VIN
      64. 6.6.64 (8Bh) READ_VOUT
      65. 6.6.65 (8Ch) READ_IOUT
      66. 6.6.66 (8Dh) READ_TEMPERATURE_1
      67. 6.6.67 (98h) PMBUS_REVISION
      68. 6.6.68 (99h) MFR_ID
      69. 6.6.69 (9Ah) MFR_MODEL
      70. 6.6.70 (9Bh) MFR_REVISION
      71. 6.6.71 (9Eh) MFR_SERIAL
      72. 6.6.72 (ADh) IC_DEVICE_ID
      73. 6.6.73 (AEh) IC_DEVICE_REV
      74. 6.6.74 (B1h) USER_DATA_01 (COMPENSATION_CONFIG)
      75. 6.6.75 (B5h) USER_DATA_05 (POWER_STAGE_CONFIG)
      76. 6.6.76 (D0h) MFR_SPECIFIC_00 (TELEMETRY_CONFIG)
      77. 6.6.77 (DAh) MFR_SPECIFIC_10 (READ_ALL)
      78. 6.6.78 (DBh) MFR_SPECIFIC_11 (STATUS_ALL)
      79. 6.6.79 (DCh) MFR_SPECIFIC_12 (STATUS_PHASE)
      80. 6.6.80 (E3h) MFR_SPECIFIC_19 (PGOOD_CONFIG)
      81. 6.6.81 (E4h) MFR_SPECIFIC_20 (SYNC_CONFIG)
      82. 6.6.82 (ECh) MFR_SPECIFIC_28 (STACK_CONFIG)
      83. 6.6.83 (EDh) MFR_SPECIFIC_29 (MISC_OPTIONS)
      84. 6.6.84 (EEh) MFR_SPECIFIC_30 (PIN_DETECT_OVERRIDE)
      85. 6.6.85 (EFh) MFR_SPECIFIC_31 (DEVICE_ADDRESS)
      86. 6.6.86 (F0h) MFR_SPECIFIC_32 (NVM_CHECKSUM)
      87. 6.6.87 (F1h) MFR_SPECIFIC_33 (SIMULATE_FAULT)
      88. 6.6.88 (FAh) MFR_SPECIFIC_42 (PASSKEY)
      89. 6.6.89 (FBh) MFR_SPECIFIC_43 (EXT_WRITE_PROTECT)
      90. 6.6.90 (FCh) MFR_SPECIFIC_44 (FUSION_ID0)
      91. 6.6.91 (FDh) MFR_SPECIFIC_45 (FUSION_ID1)
  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  Switching Frequency
        3. 7.2.2.3  Inductor Selection
        4. 7.2.2.4  Output Capacitor Selection
          1. 7.2.2.4.1 Output Voltage Deviation During Load Transient
          2. 7.2.2.4.2 Output Voltage Ripple
        5. 7.2.2.5  Input Capacitor Selection
        6. 7.2.2.6  AVIN, BP1V5, VDD5 Bypass Capacitor
        7. 7.2.2.7  Bootstrap Capacitor Selection
        8. 7.2.2.8  R-C Snubber
        9. 7.2.2.9  Output Voltage Setting (VSEL Pin)
        10. 7.2.2.10 Compensation Selection (MSEL1 Pin)
        11. 7.2.2.11 Soft Start, Overcurrent Protection, and Stacking Configuration (MSEL2 Pin)
        12. 7.2.2.12 Enable and UVLO
        13. 7.2.2.13 ADRSEL
        14. 7.2.2.14 Pin-Strapping Resistor Selection
        15. 7.2.2.15 BCX_CLK and BCX_DAT
      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
      3. 7.4.3 Mounting and Thermal Profile Recommendation
  9. 8 Device and Documentation Support
    1. 8.1 Device Support
      1. 8.1.1 Third-Party Products Disclaimer
      2. 8.1.2 Development Support
        1. 8.1.2.1 Custom Design With WEBENCH® Tools
        2. 8.1.2.2 Texas Instruments Fusion Digital Power Designer
    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

7.2.2.3 Inductor Selection

Use Equation 9 to calculate the value of the output inductor (L). The coefficient, KIND, represents the amount of inductor-ripple current relative to the maximum output current. The output capacitor filters the inductor-ripple current. Therefore, selecting a high inductor-ripple current impacts the selection of the output capacitor because the output capacitor must have a ripple-current rating equal to or greater than the inductor-ripple current. Generally, the KIND coefficient must be kept between 0.2 and 0.3 for balanced performance. Additionally the product of KIND and IOUT(Max) must be kept above 1 Ato prevent the inductance from being too large. Using this target ripple current, the required inductor size can be calculated as shown in Equation 9.

Equation 9. GUID-B4778879-AD22-4886-BAD9-F5BC2DAB8DB1-low.gif

Selecting a value of 0.3 for the KIND coefficient, the target inductance, L, is 574 nH. An inductance of 680 nH is selected. Use Equation 10, Equation 11, and Equation 12 to calculate the inductor-ripple current (IRIPPLE), RMS current (IL(rms)), and peak current (IL(peak)), respectively. Use these values to select an inductor with approximately the target inductance value, and current ratings that allow normal operation with some margin.

Equation 10. GUID-539E56CA-DE3D-452C-B841-D1DE8A3EE83C-low.gif
Equation 11. GUID-73074686-788E-4EBE-800B-9B7F2224816C-low.gif
Equation 12. GUID-A4C2A525-2CAB-4A10-AAAB-DD19D9F3C568-low.gif

Considering the required inductance, RMS current and peak current, the 680-nH inductor, XAL8080-681ME, from Coilcraft was selected for this application.