SLUS930D April   2011  – November  2016 TPS40400

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 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 Switching Characteristics
    7. 6.7 Dissipation Ratings
    8. 6.8 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Output Voltage Setting
      2. 7.3.2 Input Voltage Feedforward
      3. 7.3.3 Output Current Limit and Warning
      4. 7.3.4 Linear Regulators
      5. 7.3.5 PMBus Address
      6. 7.3.6 PMBus Connections
      7. 7.3.7 PMBus Functionality and Additional Set-Up
        1. 7.3.7.1  Data Format
        2. 7.3.7.2  Output Voltage Adjustment
        3. 7.3.7.3  Overcurrent Threshold
        4. 7.3.7.4  Output Current Reading
        5. 7.3.7.5  Soft-Start Time
        6. 7.3.7.6  Power Good
        7. 7.3.7.7  Undervoltage Lockout (UVLO)
        8. 7.3.7.8  Output Overvoltage and Undervoltage Thresholds
        9. 7.3.7.9  Programmable Fault Responses
        10. 7.3.7.10 User Data and Adjustable Anti-Cross-Conduction Delay
    4. 7.4 Device Functional Modes
      1. 7.4.1 Continuous Conduction Mode
      2. 7.4.2 Operation with CNTL Signal Control
      3. 7.4.3 Operation with OPERATION Control
      4. 7.4.4 Operation with CNTL and OPERATION Control
      5. 7.4.5 Operation without CNTL or OPERATION Control
      6. 7.4.6 Operation with Output Trim and Margin
    5. 7.5 Programming
      1. 7.5.1 Supported PMBus Commands
    6. 7.6 Register Maps
      1. 7.6.1  OPERATION (01h)
        1. 7.6.1.1 On
        2. 7.6.1.2 Margin
      2. 7.6.2  ON_OFF_CONFIG (02h)
        1. 7.6.2.1 Pu
        2. 7.6.2.2 Cmd
        3. 7.6.2.3 Cpr
        4. 7.6.2.4 Pol
        5. 7.6.2.5 Cpa
      3. 7.6.3  CLEAR_FAULTS (03h)
      4. 7.6.4  WRITE_PROTECT (10h)
      5. 7.6.5  STORE_DEFAULT_ALL (11h)
      6. 7.6.6  RESTORE_DEFAULT_ALL (12h)
      7. 7.6.7  STORE_DEFAULT_CODE (13h)
      8. 7.6.8  RESTORE_DEFAULT_CODE (14h)
      9. 7.6.9  VOUT_MODE (20h)
        1. 7.6.9.1 Mode
        2. 7.6.9.2 Exponent
      10. 7.6.10 VOUT_TRIM (22h)
      11. 7.6.11 VOUT_MARGIN_HIGH (25h)
      12. 7.6.12 VOUT_MARGIN_LOW (26h)
      13. 7.6.13 VOUT_SCALE_LOOP (29h)
        1. 7.6.13.1 Exponent
        2. 7.6.13.2 Mantissa
      14. 7.6.14 FREQUENCY_SWITCH (33h)
        1. 7.6.14.1 Exponent
        2. 7.6.14.2 Mantissa
      15. 7.6.15 VIN_ON (35h)
        1. 7.6.15.1 Exponent
        2. 7.6.15.2 Mantissa
      16. 7.6.16 VIN_OFF (36h)
        1. 7.6.16.1 Exponent
        2. 7.6.16.2 Mantissa
      17. 7.6.17 IOUT_CAL_GAIN (38h)
        1. 7.6.17.1 Exponent
        2. 7.6.17.2 Mantissa
      18. 7.6.18 IOUT_CAL_OFFSET (39h)
        1. 7.6.18.1 Exponent
        2. 7.6.18.2 Mantissa
      19. 7.6.19 VOUT_OV_FAULT_LIMIT (40h)
      20. 7.6.20 VOUT_OV_FAULT_RESPONSE (41h)
        1. 7.6.20.1 RSP[1:0]
        2. 7.6.20.2 RS[2:0]
      21. 7.6.21 VOUT_UV_FAULT_LIMIT (44h)
      22. 7.6.22 VOUT_UV_FAULT_RESPONSE (45h)
        1. 7.6.22.1 RSP[1:0]
        2. 7.6.22.2 RS[2:0]
      23. 7.6.23 IOUT_OC_FAULT_LIMIT (46h)
        1. 7.6.23.1 Exponent
        2. 7.6.23.2 Mantissa
      24. 7.6.24 IOUT_OC_FAULT_RESPONSE (47h)
        1. 7.6.24.1 RSP[1:0]
        2. 7.6.24.2 RS[2:0]
      25. 7.6.25 IOUT_OC_WARN_LIMIT (4Ah)
        1. 7.6.25.1 Exponent
        2. 7.6.25.2 Mantissa
      26. 7.6.26 OT_FAULT_RESPONSE (50h)
        1. 7.6.26.1 OTF_RS
      27. 7.6.27 POWER_GOOD_ON (5Eh)
      28. 7.6.28 POWER_GOOD_OFF (5Fh)
      29. 7.6.29 TON_RISE (61h)
        1. 7.6.29.1 Exponent
        2. 7.6.29.2 Mantissa
      30. 7.6.30 STATUS_BYTE (78h)
      31. 7.6.31 STATUS_WORD (78h)
      32. 7.6.32 STATUS_VOUT (7Ah)
      33. 7.6.33 STATUS_IOUT (7Bh)
      34. 7.6.34 STATUS_TEMPERATURE (7Dh)
      35. 7.6.35 STATUS_CML (7Eh)
      36. 7.6.36 READ_VIN (88h)
        1. 7.6.36.1 Exponent
        2. 7.6.36.2 Mantissa
      37. 7.6.37 READ_VOUT (8Bh)
        1. 7.6.37.1 Exponent
        2. 7.6.37.2 Mantissa
      38. 7.6.38 READ_IOUT (8Ch)
        1. 7.6.38.1 Exponent
        2. 7.6.38.2 Mantissa
      39. 7.6.39 PMBUS_REVISION (98h)
      40. 7.6.40 MFR_VIN_MIN (A0h)
        1. 7.6.40.1 Exponent
        2. 7.6.40.2 Mantissa
      41. 7.6.41 MFR_VIN_MAX (A1h)
        1. 7.6.41.1 Exponent
        2. 7.6.41.2 Mantissa
      42. 7.6.42 MFR_VOUT_MIN (A4h)
        1. 7.6.42.1 Exponent
        2. 7.6.42.2 Mantissa
      43. 7.6.43 MFR_VOUT_MAX (A5h)
        1. 7.6.43.1 Exponent
        2. 7.6.43.2 Mantissa
      44. 7.6.44 MFR_SPECIFIC_00 (D0h)
        1. 7.6.44.1 Dead-Time Control Setting (DTC)
        2. 7.6.44.2 WPE
      45. 7.6.45 MFR_SPECIFIC_01 (D1h)
      46. 7.6.46 MFR_SPECIFIC_02 (D2h)
      47. 7.6.47 MFR_SPECIFIC_03 (D3h)
      48. 7.6.48 MFR_SPECIFIC_04 (D4h)
      49. 7.6.49 MFR_SPECIFIC_05 (D5h)
      50. 7.6.50 MFR_SPECIFIC_06 (D6h)
      51. 7.6.51 MFR_SPECIFIC_07 (D7h)
      52. 7.6.52 MFR_SPECIFIC_44 (FCh)
        1. 7.6.52.1 Identifier Code
        2. 7.6.52.2 Revision Code
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 TPS40400 12-V Input, 1.2-V Output, 20-A (maximum) Output Current ConverterAdded Design Example 1
        1. 8.2.1.1 Design Requirements
          1. 8.2.1.1.1 Design Example List of Materials
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1  Selecting a Switching Frequency
          2. 8.2.1.2.2  Output Inductor, LOUT
          3. 8.2.1.2.3  Output Capacitance, COUT
          4. 8.2.1.2.4  The Resistive Component of Output Ripple
          5. 8.2.1.2.5  Peak Current Rating of the Inductor
          6. 8.2.1.2.6  Input Capacitance, CIN
          7. 8.2.1.2.7  Switching MOSFETs, QHS and QLS
          8. 8.2.1.2.8  Device Addressing, RADDR0 and RADDR1
          9. 8.2.1.2.9  Current Sense Flter, R16 and C17
          10. 8.2.1.2.10 Voltage Decoupling Capacitors, CBP3, CBP6, and CVDD
          11. 8.2.1.2.11 Bootstrap Capacitor, C9
          12. 8.2.1.2.12 Snubber R12 and C16
          13. 8.2.1.2.13 Loop Compensaton Components
          14. 8.2.1.2.14 Output Voltage Set Point, RBIAS
          15. 8.2.1.2.15 Remote Sensing
        3. 8.2.1.3 Application Curves
      2. 8.2.2 TPS40400 12-V Input 5-V Output, 5-A (Maximum) Output Current Converter Design Example 2Added Design Example 2
        1. 8.2.2.1 Design Requirements
          1. 8.2.2.1.1 List of Materials
        2. 8.2.2.2 Application Curves
    3. 8.3 Initialization Setup
      1. 8.3.1 Internal Configuration
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Examples
    3. 10.3 Thermal Considerations
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
    2. 11.2 Community Resources
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

パッケージ・オプション

メカニカル・データ（パッケージ｜ピン）
サーマルパッド・メカニカル・データ
発注情報

1 Features

  • Input Operating Voltage Range: 3 V to 20 V
  • PMBus Enabled Analog Controller
  • Reference 600 mV ± 1%
  • Remote Voltage Sense Amplifier
  • Internal 6-V Regulator and 6-V Gate Drive
  • Programmable Overcurrent Protection
  • Inductor Resistance or Series Resistance Used for Current Sensing
  • Programmable Switching Frequency: 200 kHz to 2 MHz
  • Powergood Indicator
  • Thermal Shutdown
  • Programmable Soft-Start
  • Internal Bootstrap Diode
  • Prebias Output Safe
  • 24-Pin QFN Package

2 Applications

  • Smart Power Systems
  • Power Supply Modules
  • Communications Equipment
  • Computing Equipment

3 Description

The TPS40400 is a cost-optimized flexible synchronous buck controller that operates from a nominal 3-V to 20-V supply. This controller is an analog PWM controller that allows programming and monitoring through the PMBus™ interface. Flexible features found on this device include programmable soft-start time, programmable short circuit limit, and programmable undervoltage lockout (UVLO).

An adaptive anti-cross conduction scheme is used to prevent shoot through current in the power FETs. Gate drive voltage is 6 V to better enhance the power FETs for reduced losses. Short circuit detection occurs by sensing the voltage drop across the inductor or across a resistor placed in series with the inductor. A PMBus programmable threshold is compared to this voltage and is used to detect overcurrent. When the overcurrent threshold is reached, a pulse by pulse current limit scheme is used to limit the current to acceptable levels. If the overcurrent condition persists for more than 7 clock cycles of the converter, a fault condition is declared and the converter shuts down and goes into either a hiccup restart mode or latches off. The behavior can be selected through the PMBus interface. Other PMBus interface features include programmable operating frequency, soft-start time, overvoltage and undervoltage thresholds and the response to those events, output voltage change including margining as well as status monitoring.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
TPS40400 VQFN (24) 3.50 mm × 5.50 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Simplified Application

TPS40400 v09073_lus930.gif