SLVSAA4G June   2010  – February 2018 TPS65251

PRODUCTION DATA.  

  1. Features
  2. Applications
  3. Description
    1.     Device Images
      1.      Typical Application Schematic
  4. Revision History
  5. Description (continued)
  6. Pin Configuration and Functions
    1.     Pin Functions
  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. 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. 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

Typical Characteristics

TA = 25°C, VIN = 12 V, fSW = 500 kHz (unless otherwise noted)
TPS65251 eff_1a_lvsaa3.gif
fSW = 500 kHz, VOUT = 3.3 V, L= 4.7 µH, DCR = 28 mΩ
Figure 1. BUCK1 Efficiency
TPS65251 eff_3a_lvsaa3.gif
CO = 22 µF, VOUT = 3.3 V, L = 4.7 µH
Figure 3. BUCK1 Efficiency Low-Power Enabled
TPS65251 eff2_2a_lvsaa3.gif
fSW = 500 kHz, VOUT = 1.8 V, L = 4.7 µH, DCR = 28 mΩ
(Also Applies to Buck 3)
Figure 5. BUCK2 Efficiency
TPS65251 eff3_1a_lvsaa3.gif
VOUT = 2.5 V, L = 4.7 µH, DCR = 28 mΩ
(Also Applies to Buck 2)
Figure 7. BUCK3 Efficiency
TPS65251 BUCK1_LINE REGULATION.gifFigure 9. BUCK1 Line Regulation
TPS65251 BUCK2_LINE REGULATION.gifFigure 11. BUCK2 Line Regulation
TPS65251 BUCK3_LINE REGULATION.gifFigure 13. BUCK3 Line Regulation
TPS65251 eff_2a_lvsaa3.gif
fSW = 500 kHz, VOUT = 1.2 V, L = 4.7 µH, DCR = 28 mΩ
Figure 2. BUCK1 Efficiency
TPS65251 eff2_1a_lvsaa3.gif
fSW = 500 kHz, VOUT = 3.3 V, L = 4.7 µH, DCR = 28 mΩ
(Also Applies to Buck 3)
Figure 4. BUCK2 Efficiency
TPS65251 eff2_3a_lvsaa3.gif
VOUT = 2.5 V, L = 4.7 µF
Figure 6. BUCK2 Efficiency Low-Power Enabled
TPS65251 eff3_2a_lvsaa3.gif
VOUT = 2.5 V, L = 4.7 µF
Figure 8. BUCK3 Efficiency Low-Power Enabled
TPS65251 BUCK1_Load Regulation.gifFigure 10. BUCK1 Load Regulation
TPS65251 BUCK2_Load Regulation.gifFigure 12. BUCK2 Load Regulation
TPS65251 BUCK3_Load Regulation.gifFigure 14. BUCK3 Load Regulation