SLUS930D April 2011  – November  2016 TPS40400

PRODUCTION DATA. 

  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configuration and Functions
  6. Specifications
    1. 6.1Absolute Maximum Ratings
    2. 6.2ESD Ratings
    3. 6.3Recommended Operating Conditions
    4. 6.4Thermal Information
    5. 6.5Electrical Characteristics
    6. 6.6Switching Characteristics
    7. 6.7Dissipation Ratings
    8. 6.8Typical Characteristics
  7. Detailed Description
    1. 7.1Overview
    2. 7.2Functional Block Diagram
    3. 7.3Feature Description
      1. 7.3.1Output Voltage Setting
      2. 7.3.2Input Voltage Feedforward
      3. 7.3.3Output Current Limit and Warning
      4. 7.3.4Linear Regulators
      5. 7.3.5PMBus Address
      6. 7.3.6PMBus Connections
      7. 7.3.7PMBus 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. 7.3.7.10User Data and Adjustable Anti-Cross-Conduction Delay
    4. 7.4Device Functional Modes
      1. 7.4.1Continuous Conduction Mode
      2. 7.4.2Operation with CNTL Signal Control
      3. 7.4.3Operation with OPERATION Control
      4. 7.4.4Operation with CNTL and OPERATION Control
      5. 7.4.5Operation without CNTL or OPERATION Control
      6. 7.4.6Operation with Output Trim and Margin
    5. 7.5Programming
      1. 7.5.1Supported PMBus Commands
    6. 7.6Register Maps
      1. 7.6.1 OPERATION (01h)
        1. 7.6.1.1On
        2. 7.6.1.2Margin
      2. 7.6.2 ON_OFF_CONFIG (02h)
        1. 7.6.2.1Pu
        2. 7.6.2.2Cmd
        3. 7.6.2.3Cpr
        4. 7.6.2.4Pol
        5. 7.6.2.5Cpa
      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. 7.6.9.1Mode
        2. 7.6.9.2Exponent
      10. 7.6.10VOUT_TRIM (22h)
      11. 7.6.11VOUT_MARGIN_HIGH (25h)
      12. 7.6.12VOUT_MARGIN_LOW (26h)
      13. 7.6.13VOUT_SCALE_LOOP (29h)
        1. 7.6.13.1Exponent
        2. 7.6.13.2Mantissa
      14. 7.6.14FREQUENCY_SWITCH (33h)
        1. 7.6.14.1Exponent
        2. 7.6.14.2Mantissa
      15. 7.6.15VIN_ON (35h)
        1. 7.6.15.1Exponent
        2. 7.6.15.2Mantissa
      16. 7.6.16VIN_OFF (36h)
        1. 7.6.16.1Exponent
        2. 7.6.16.2Mantissa
      17. 7.6.17IOUT_CAL_GAIN (38h)
        1. 7.6.17.1Exponent
        2. 7.6.17.2Mantissa
      18. 7.6.18IOUT_CAL_OFFSET (39h)
        1. 7.6.18.1Exponent
        2. 7.6.18.2Mantissa
      19. 7.6.19VOUT_OV_FAULT_LIMIT (40h)
      20. 7.6.20VOUT_OV_FAULT_RESPONSE (41h)
        1. 7.6.20.1RSP[1:0]
        2. 7.6.20.2RS[2:0]
      21. 7.6.21VOUT_UV_FAULT_LIMIT (44h)
      22. 7.6.22VOUT_UV_FAULT_RESPONSE (45h)
        1. 7.6.22.1RSP[1:0]
        2. 7.6.22.2RS[2:0]
      23. 7.6.23IOUT_OC_FAULT_LIMIT (46h)
        1. 7.6.23.1Exponent
        2. 7.6.23.2Mantissa
      24. 7.6.24IOUT_OC_FAULT_RESPONSE (47h)
        1. 7.6.24.1RSP[1:0]
        2. 7.6.24.2RS[2:0]
      25. 7.6.25IOUT_OC_WARN_LIMIT (4Ah)
        1. 7.6.25.1Exponent
        2. 7.6.25.2Mantissa
      26. 7.6.26OT_FAULT_RESPONSE (50h)
        1. 7.6.26.1OTF_RS
      27. 7.6.27POWER_GOOD_ON (5Eh)
      28. 7.6.28POWER_GOOD_OFF (5Fh)
      29. 7.6.29TON_RISE (61h)
        1. 7.6.29.1Exponent
        2. 7.6.29.2Mantissa
      30. 7.6.30STATUS_BYTE (78h)
      31. 7.6.31STATUS_WORD (78h)
      32. 7.6.32STATUS_VOUT (7Ah)
      33. 7.6.33STATUS_IOUT (7Bh)
      34. 7.6.34STATUS_TEMPERATURE (7Dh)
      35. 7.6.35STATUS_CML (7Eh)
      36. 7.6.36READ_VIN (88h)
        1. 7.6.36.1Exponent
        2. 7.6.36.2Mantissa
      37. 7.6.37READ_VOUT (8Bh)
        1. 7.6.37.1Exponent
        2. 7.6.37.2Mantissa
      38. 7.6.38READ_IOUT (8Ch)
        1. 7.6.38.1Exponent
        2. 7.6.38.2Mantissa
      39. 7.6.39PMBUS_REVISION (98h)
      40. 7.6.40MFR_VIN_MIN (A0h)
        1. 7.6.40.1Exponent
        2. 7.6.40.2Mantissa
      41. 7.6.41MFR_VIN_MAX (A1h)
        1. 7.6.41.1Exponent
        2. 7.6.41.2Mantissa
      42. 7.6.42MFR_VOUT_MIN (A4h)
        1. 7.6.42.1Exponent
        2. 7.6.42.2Mantissa
      43. 7.6.43MFR_VOUT_MAX (A5h)
        1. 7.6.43.1Exponent
        2. 7.6.43.2Mantissa
      44. 7.6.44MFR_SPECIFIC_00 (D0h)
        1. 7.6.44.1Dead-Time Control Setting (DTC)
        2. 7.6.44.2WPE
      45. 7.6.45MFR_SPECIFIC_01 (D1h)
      46. 7.6.46MFR_SPECIFIC_02 (D2h)
      47. 7.6.47MFR_SPECIFIC_03 (D3h)
      48. 7.6.48MFR_SPECIFIC_04 (D4h)
      49. 7.6.49MFR_SPECIFIC_05 (D5h)
      50. 7.6.50MFR_SPECIFIC_06 (D6h)
      51. 7.6.51MFR_SPECIFIC_07 (D7h)
      52. 7.6.52MFR_SPECIFIC_44 (FCh)
        1. 7.6.52.1Identifier Code
        2. 7.6.52.2Revision Code
  8. Application and Implementation
    1. 8.1Application Information
    2. 8.2Typical Applications
      1. 8.2.1TPS40400 12-V Input, 1.2-V Output, 20-A (maximum) Output Current ConverterAdded Design Example 1
        1. 8.2.1.1Design Requirements
          1. 8.2.1.1.1Design Example List of Materials
        2. 8.2.1.2Detailed 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. 8.2.1.2.10Voltage Decoupling Capacitors, CBP3, CBP6, and CVDD
          11. 8.2.1.2.11Bootstrap Capacitor, C9
          12. 8.2.1.2.12Snubber R12 and C16
          13. 8.2.1.2.13Loop Compensaton Components
          14. 8.2.1.2.14Output Voltage Set Point, RBIAS
          15. 8.2.1.2.15Remote Sensing
        3. 8.2.1.3Application Curves
      2. 8.2.2TPS40400 12-V Input 5-V Output, 5-A (Maximum) Output Current Converter Design Example 2Added Design Example 2
        1. 8.2.2.1Design Requirements
          1. 8.2.2.1.1List of Materials
        2. 8.2.2.2Application Curves
    3. 8.3Initialization Setup
      1. 8.3.1Internal Configuration
  9. Power Supply Recommendations
  10. 10Layout
    1. 10.1Layout Guidelines
    2. 10.2Layout Examples
    3. 10.3Thermal Considerations
  11. 11Device and Documentation Support
    1. 11.1Device Support
      1. 11.1.1Third-Party Products Disclaimer
    2. 11.2Community Resources
    3. 11.3Trademarks
    4. 11.4Electrostatic Discharge Caution
    5. 11.5Glossary
  12. 12Mechanical, Packaging, and Orderable Information

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

Applications

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

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 NUMBERPACKAGEBODY SIZE (NOM)
TPS40400VQFN (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