SLUS600E April   2004  – December 2014 TPS51100

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 Recommended Operating Conditions
    3. 6.3 Thermal Information
    4. 6.4 Electrical Characteristics
    5. 6.5 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 VTT Sink/Source Regulator
      2. 7.3.2 VTTREF Regulator
      3. 7.3.3 Soft-Start
      4. 7.3.4 VTT Current Protection
      5. 7.3.5 VIN UVLO Protection
      6. 7.3.6 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 S5 Control and Soft-Off
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Output Capacitor
        2. 8.2.2.2 Input Capacitor
        3. 8.2.2.3 VIN Capacitor
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
    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 Trademarks
    3. 11.3 Electrostatic Discharge Caution
    4. 11.4 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • DGQ|10
Thermal pad, mechanical data (Package|Pins)
Orderable Information

8 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality.

8.1 Application Information

The TPS51100 is typically used as a sink / source tracking termination regulator, witch converter a voltage from VTT.

8.2 Typical Application

v04015_lus600.gifFigure 23. TPS51100 5-V Input / 1.8-V Output Reference Design

8.2.1 Design Requirements

Table 2. Design Parameters

DESIGN PARAMETERS EXAMPLE VALUE
VIN 4.75 V to 5.25 V
VDDQSNS, VLDOIN 1.8 V
Output Current ±3 A

8.2.2 Detailed Design Procedure

Table 3. Design Specifications

REFERENCE DESIGNATOR SPECIFICATION MANUFACTURER PART NUMBER
C1 10-μf, 6.3-V, X5R, 2012 (0805) TDK C2012JB0J106K
C2 0.1-μf, 50-V, X5R, 1608 (0603) TDK C1608JB1H104K

8.2.2.1 Output Capacitor

For stable operation, total capacitance of the VTT output terminal can be equal to or greater than 20 μF. Attach two 10-μF ceramic capacitors in parallel to minimize the effect of ESR and ESL. If the ESR is greater than 2 mΩ, insert an R-C filter between the output and the VTTSNS input to achieve loop stability. The R-C filter time constant should be almost the same or slightly lower than the time constant of the output capacitor and its ESR.

Soft-start duration, tSS, is also a function of this output capacitance. Where ITTOCL = 2.2 A (typ), tSS can be calculated as,

Equation 1. eq_01_lus600_.gif

8.2.2.2 Input Capacitor

Depending on the trace impedance between the VLDOIN bulk power supply to the part, transient increase of source current is supplied mostly by the charge from the VLDOIN input capacitor. Use a 10-μF (or more) ceramic capacitor to supply this transient charge. Provide more input capacitance as more output capacitance is used at VTT. In general, use 1/2 COUT for the input.

8.2.2.3 VIN Capacitor

Add a ceramic capacitor with a value between 1 μF and 4.7 μF placed close to the VIN pin, to stabilize 5 V from any parasitic impedance from the supply.

8.2.3 Application Curves

g014_lus600.gifFigure 24. Start-Up Waveforms S5 Low-to-High
g016_lus600.gifFigure 26. Shutdown Waveforms S3 High-to-Low
g015_lus600.gifFigure 25. Start-Up Waveforms S3 Low-to-High