JAJSRP9 September   2024

ADVANCE INFORMATION  

  1.   1
  2. 1 特長
  3. 2 アプリケーション
  4. 3 説明
  5. 4 Device Options
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1 Absolute Maximum Rating
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 I2C Interface Timing Characteristics
    7. 6.7 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Pulse Frequency Modulation (PFM)
      2. 7.3.2 Forced PWM Mode
      3. 7.3.3 Low Dropout Operation (100% Duty Cycle)
      4. 7.3.4 Soft Start
      5. 7.3.5 Switch Current Limit and HICCUP Short-Circuit Protection
      6. 7.3.6 Undervoltage Lockout
      7. 7.3.7 Thermal Warning and Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Enable and Disable (EN)
      2. 7.4.2 Output Discharge
      3. 7.4.3 Power Good (PG)
      4. 7.4.4 Voltage Setting and Mode Selection (VSET/MODE)
    5. 7.5 Programming
      1. 7.5.1 Serial Interface Description
      2. 7.5.2 Standard-, Fast-, and Fast-Mode Plus Protocol
      3. 7.5.3 HS Mode Protocol
      4. 7.5.4 I2C Update Sequence
      5. 7.5.5 I2C Register Reset
  9. 8 Register Map
    1. 8.1 Target Address Byte
    2. 8.2 Register Address Byte
    3. 8.3 VOUT Register 1
    4. 8.4 VOUT Register 2
    5. 8.5 CONTROL Register
    6. 8.6 STATUS Register
  10. 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 Custom Design With WEBENCH® Tools
        2. 9.2.2.2 Setting The Output Voltage
        3. 9.2.2.3 Output Filter Design
        4. 9.2.2.4 Inductor Selection
        5. 9.2.2.5 Capacitor Selection
      3. 9.2.3 Application Curves
    3. 9.3 Power Supply Recommendations
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
      2. 9.4.2 Layout Example
        1. 9.4.2.1 Thermal Considerations
  11. 10Device and Documentation Support
    1. 10.1 Device Support
      1. 10.1.1 サード・パーティ製品に関する免責事項
      2. 10.1.2 Development Support
        1. 10.1.2.1 Custom Design With WEBENCH® Tools
    2. 10.2 Documentation Support
      1. 10.2.1 Related Documentation
    3. 10.3 ドキュメントの更新通知を受け取る方法
    4. 10.4 サポート・リソース
    5. 10.5 Trademarks
    6. 10.6 静電気放電に関する注意事項
    7. 10.7 用語集
  12. 11Revision History
  13. 12Mechanical, Packaging, and Orderable Information
    1. 12.1 Tape and Reel Information

7.4.4 Voltage Setting and Mode Selection (VSET/MODE)

During the enable delay (tDelay), the device configuration is set by an external resistor connected to the VSET/MODE pin through an internal R2D (resistor to digital) converter. Table 7-2 shows the options.

The R2D converter has an internal current source that applies current through the external resistor and an internal ADC that reads back the resulting voltage level. Depending on the level, the output voltage is set. After this R2D conversion is finished, the current source is turned off to avoid current flowing through the external resistor. Make sure that there is no additional current path or capacitance greater than 30pF from this pin to GND during R2D conversion. Otherwise, a false value is set.

Table 7-2 Voltage Selection Table
RESISTOR (E96 SERIES, ±1% ACCURACY) AT VSET/MODE PINFIXED OR ADJUSTABLE OUTPUT VOLTAGE
249kΩ or logic highAdjustable (through a resistive divider on the FB pin)
205kΩ1.60V
162kΩ1.50V
133kΩ1.35V
105kΩ1.20V
86.6kΩReserved
68.1kΩ1.00V
56.2kΩ0.90V
44.2kΩ0.85V
36.5kΩ0.80V
28.7kΩ0.70V
23.7kΩ0.60V
18.7kΩ0.50V
15.4kΩ0.45V
12.1kΩ0.40V
10kΩ or logic lowAdjustable (through a resistive divider on the FB pin)

When the device is set as a fixed output voltage converter, then FB pin must be connected to the output directly. Refer to Figure 7-5.

After the start-up period (tStartup), a different operation mode can be selected. When VSET/MODE is high, the device operates in forced PWM mode, otherwise the device operates in power save mode.

TPS6286A06 TPS6286B10 Typical Application - Fixed Start-up Output VoltageFigure 7-5 Typical Application - Fixed Start-up Output Voltage