SLVSC27D July   2013  – October 2016 TPS65631W

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Simplified Schematic
  5. 5 Revision History
  6. 6 Pin Configuration and 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 Timing Requirements
    7. 7.7 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 Boost Converter
      2. 8.3.2 Inverting Buck-Boost Converter
      3. 8.3.3 Soft-Start and Start-Up Sequence
      4. 8.3.4 Enable (CTRL)
      5. 8.3.5 Undervoltage Lockout
      6. 8.3.6 Short Circuit Protection
        1. 8.3.6.1 Short-Circuits During Normal Operation
        2. 8.3.6.2 Short-Circuits During Start-Up
      7. 8.3.7 Thermal Shutdown
    4. 8.4 Device Functional Modes
      1. 8.4.1 Operation with VI < 2.9 V
      2. 8.4.2 Operation with VI ≈ VPOS (Diode Mode)
      3. 8.4.3 Operation with CTRL
    5. 8.5 Programming
      1. 8.5.1 Programming VNEG
  9. 9 Applications 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 Inductor Selection
        2. 9.2.2.2 Capacitor Selection
        3. 9.2.2.3 Stability
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Third-Party Products Disclaimer
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Community Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

9 Applications 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.

9.1 Application Information

Figure 8 shows a typical application circuit suitable for supplying AMOLED displays in smartphone applications. The circuit is designed to operate from a single-cell Li-Ion battery and generates a positive output voltage VPOS of 4.6 V and a negative output voltage of –4 V. Both outputs are capable of supplying up to 200 mA of output current.

9.2 Typical Application

TPS65631W Schem_01_TPS65631W.gif Figure 8. Typical Application Schematic

9.2.1 Design Requirements

For this design example, use the following input parameters.

Table 2. Design Parameters

DESIGN PARAMETER EXAMPLE
Input voltage range 2.9 V to 4.5 V
Output voltage VPOS = 4.6V, VNEG = –4 V

9.2.2 Detailed Design Procedure

In order to maximize performance, the TPS65631W has been optimized for use with a relatively narrow range of component values, and customers are strongly recommended to use the application circuit shown in Figure 8 with the components listed in Table 3 and Table 4.

9.2.2.1 Inductor Selection

The boost converter and inverting buck-boost converter have been optimized for use with 10 µH inductors, and it is recommended that this value be used in all applications. Customers using other values of inductor are strongly recommended to characterize circuit performance on a case-by-case basis.

Table 3. Inductor Selection(1)

PARAMETER VALUE MANUFACTURER PART NUMBER
L1, L2 10 µH Toko DFE252012C-100M
ABCO LPP252012-100M
Taiyo Yuden MDKK2020T-100M

9.2.2.2 Capacitor Selection

The recommended capacitor values are shown in Table 4. Applications using less than the recommended capacitance (e.g. to save PCB area) may experience increased voltage ripple. In general, the lower the output power, the lower the necessary capacitance.

Table 4. Capacitor Selection(1)

PARAMETER VALUE MANUFACTURER PART NUMBER
C1, C2, C3 10 µF Murata GRM21BR71A106KE51
C4 100 nF Murata GRM21BR71E104KA01

9.2.2.3 Stability

Applications using component values that differ significantly from those recommended in Table 3 and Table 4 should be checked for stability over the full range of operating conditions.

9.2.3 Application Curves

The performance shown in the following graphs was obtained using the circuit shown in Figure 8 and the external components shown in Table 3 and Table 4. The output voltage settings for these measurements were VPOS = 4.6 V and VNEG = –4 V.

TPS65631W TPS65631W_App_Perf_01.png
Figure 9. Efficiency vs. Output Current
TPS65631W TPS65631W_App_Perf_02.gif Figure 11. Start-Up Waveforms
TPS65631W TPS65631W_App_Perf_04.gif Figure 13. VPOS Switch Voltage, Inductor Current and Output Voltage Ripple (IO = 200 mA)
TPS65631W TPS65631W_App_Perf_06.gif
Figure 15. VNEG Switch Voltage, Inductor Current and Output Voltage Ripple (IO = 200 mA)
TPS65631W TPS65631W_App_Perf_08.png
Figure 17. Inverting Buck-Boost Converter Line Regulation
TPS65631W TPS65631W_App_Perf_10.png
Figure 19. Inverting Buck-Boost Converter Load Regulation
TPS65631W TPS65631W_App_Perf_12.gif
A.
Figure 21. Boost Converter Load Transient Response
TPS65631W TPS65631W_App_Perf_01a.png
A.
Figure 10. Efficiency vs. Output Current (Log Scale)
TPS65631W TPS65631W_App_Perf_03.gif Figure 12. VPOS Switch Voltage, Inductor Current and Output Voltage Ripple (IO = 100 mA)
TPS65631W TPS65631W_App_Perf_05.gif Figure 14. VNEG Switch Voltage, Inductor Current and Output Voltage Ripple (IO = 100 mA)
TPS65631W TPS65631W_App_Perf_07.png
Figure 16. Boost Converter Line Regulation
TPS65631W TPS65631W_App_Perf_09.png
Figure 18. Boost Converter Load Regulation
TPS65631W TPS65631W_App_Perf_11.gif
Figure 20. Line Transient Response
TPS65631W TPS65631W_App_Perf_13.gif
Figure 22. Inverting Buck-Boost Converter Load Transient Response