SLVSAA4G June   2010  – February 2018 TPS65251

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Typical Application Schematic
  4. 4 Revision History
  5. 5 Description (continued)
  6. 6 Pin Configuration and Functions
    1.     Pin Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Adjustable Switching Frequency
      2. 8.3.2  Synchronization
      3. 8.3.3  Out-of-Phase Operation
      4. 8.3.4  Delayed Start-Up
      5. 8.3.5  Soft-Start Time
      6. 8.3.6  Adjusting the Output Voltage
      7. 8.3.7  Input Capacitor
      8. 8.3.8  Bootstrap Capacitor
      9. 8.3.9  Error Amplifier
      10. 8.3.10 Loop Compensation
      11. 8.3.11 Slope Compensation
      12. 8.3.12 Powergood
      13. 8.3.13 Current Limit Protection
      14. 8.3.14 Overvoltage Transient Protection
      15. 8.3.15 Thermal Shutdown
    4. 8.4 Device Functional Modes
      1. 8.4.1 Low-Power Mode Operation
  9. 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  Loop Compensation Circuit
        2. 9.2.2.2  Selecting the Switching Frequency
        3. 9.2.2.3  Output Inductor Selection
        4. 9.2.2.4  Output Capacitor
        5. 9.2.2.5  Input Capacitor
        6. 9.2.2.6  Soft-Start Capacitor
        7. 9.2.2.7  Bootstrap Capacitor Selection
        8. 9.2.2.8  Adjustable Current Limiting Resistor Selection
        9. 9.2.2.9  Output Voltage and Feedback Resistors Selection
        10. 9.2.2.10 Compensation
        11. 9.2.2.11 3.3-V and 6.5-V LDO Regulators
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
    3. 11.3 Power Dissipation
  12. 12Device and Documentation Support
    1. 12.1 Receiving Notification of Documentation Updates
    2. 12.2 Community Resources
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

9.2.3 Application Curves

TPS65251 typ_strtup_1_lvsaa3.gifFigure 23. BUCK1 Start-Up
LO = 4.7 µH, CO = 22 µF, VOUT = 3.3 V, 2 A
TPS65251 typ_transload_1_lvsaa3.gifFigure 25. BUCK1 Transient Load Response
LO = 4.7 µH, CO = 22 µF, VOUT = 3.3 V, ∆I = 1 A to 1.5 A, 100 mV/div
TPS65251 typ2_strtup_lvsaa3.gifFigure 27. BUCK2 Start-Up
LO = 4.7 µH, CO = 22 µF, VOUT = 2.5 V, 1.5 A
TPS65251 typ2_transload_1_lvsaa3.gifFigure 29. BUCK2 Transient Load Response
LO = 4.7 µH, CO = 22 µF, VOUT = 2.5 V, ∆I = 1 A to 1.5 A
TPS65251 typ3_strtup_lvsaa3.gifFigure 31. BUCK3 Start-Up
VOUT = 7.5 V, 0.7 A
TPS65251 typ3_transload_1_lvsaa3.gifFigure 33. BUCK3 Transient Load Response
LO = 4.7 µH, CO = 22 µF, VOUT = 7.5 V, ∆I = 1 A to 1.5 A
TPS65251 typ_ripp_1_lvsaa3.gifFigure 24. BUCK1 Ripple
VOUT = 3.3 V, 1.5 A, fSW = 800 kHz, 20 mV/div
TPS65251 typ_transsupply_1_lvsaa3.gifFigure 26. BUCK1 Transient Supply Response
LO = 4.7 µH, CO = 22 µF, VOUT = 3.3 V, ∆VIN = 8 V to 16.5 V, 20 mV/div
TPS65251 BUCK2_Ripple.gif
Figure 28. BUCK2 Ripple
VOUT = 2.5 V, 1.5 A, fSW = 800 kHz, 10 mV/div
TPS65251 typ2_transsupply_lvsaa3.gifFigure 30. BUCK2 Transient Supply Response
LO = 4.7 µH, CO = 22 µF, VOUT = 2.5 V, ∆VIN = 9 V to 8 V
TPS65251 BUCK3_Ripple.gifFigure 32. BUCK3 Ripple
VOUT = 7.5 V, 0.5 A, fSW = 800 kHz 10 mV/div
TPS65251 typ3_transsupply_lvsaa3.gifFigure 34. BUCK3 Transient Supply Response
VOUT = 2.5 V, ∆VIN = 9 V to 8 V