JAJSOL2 August   2024 TPS55287

PRODUCTION DATA  

  1.   1
  2. 1 特長
  3. 2 アプリケーション
  4. 3 概要
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 I2C Timing Characteristics
    7. 5.7 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1  VCC Power Supply
      2. 6.3.2  EXTVCC Power Supply
      3. 6.3.3  Operation Mode Setting
      4. 6.3.4  Input Undervoltage Lockout
      5. 6.3.5  Enable and Programmable UVLO
      6. 6.3.6  Soft Start
      7. 6.3.7  Shutdown and Load Discharge
      8. 6.3.8  Switching Frequency
      9. 6.3.9  Switching Frequency Dithering
      10. 6.3.10 Inductor Current Limit
      11. 6.3.11 Internal Charge Path
      12. 6.3.12 Output Voltage Setting
      13. 6.3.13 Output Current Monitoring and Cable Voltage Droop Compensation
      14. 6.3.14 Output Current Limit
      15. 6.3.15 Overvoltage Protection
      16. 6.3.16 Output Short Circuit Protection
      17. 6.3.17 Thermal Shutdown
    4. 6.4 Device Functional Modes
      1. 6.4.1 PWM Mode
      2. 6.4.2 Power Save Mode
    5. 6.5 Programming
      1. 6.5.1 Data Validity
      2. 6.5.2 START and STOP Conditions
      3. 6.5.3 Byte Format
      4. 6.5.4 Acknowledge (ACK) and Not Acknowledge (NACK)
      5. 6.5.5 Target Address and Data Direction Bit
      6. 6.5.6 Single Read and Write
      7. 6.5.7 Multiread and Multiwrite
    6. 6.6 Register Maps
      1. 6.6.1 REF Register (Address = 0h, 1h)
      2. 6.6.2 IOUT_LIMIT Register (Address = 2h) [reset = 11100100h]
      3. 6.6.3 VOUT_SR Register (Address = 3h) [reset = 00000001h]
      4. 6.6.4 VOUT_FS Register (Address = 4h) [reset = 00000011h]
      5. 6.6.5 CDC Register (Address = 5h) [reset = 11100000h]
      6. 6.6.6 MODE Register (Address = 6h) [reset = 00100000h]
      7. 6.6.7 STATUS Register (Address = 7h) [reset = 00000011h]
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
        1. 7.2.2.1 Switching Frequency
        2. 7.2.2.2 Output Voltage Setting
        3. 7.2.2.3 Inductor Selection
        4. 7.2.2.4 Input Capacitor
        5. 7.2.2.5 Output Capacitor
        6. 7.2.2.6 Output Current Limit
        7. 7.2.2.7 Loop Stability
      3. 7.2.3 Application Curves
  9. 8 Power Supply Recommendations
  10. 9 Layout
    1. 9.1 Layout Guidelines
    2. 9.2 Layout Example
  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. 10.2 ドキュメントの更新通知を受け取る方法
    3. 10.3 サポート・リソース
    4. 10.4 Trademarks
    5. 10.5 静電気放電に関する注意事項
    6. 10.6 用語集
  12. 11Revision History
  13. 12Mechanical, Packaging, and Orderable Information

パッケージ・オプション

メカニカル・データ（パッケージ｜ピン）
サーマルパッド・メカニカル・データ
発注情報

6.6.1 REF Register (Address = 0h, 1h)

REF is shown in Figure 6-15 and Figure 6-16 and described in Table 6-4.

Return to Summary Table.

REF sets the internal reference voltage of the TPS55287. The 01h register is the high byte and the 00h register is the low byte. One LSB of register 00h stands for 0.5645 mV of the internal reference voltage. The default register value is 00000001 10100100b of 282mV. When the register value is 00000000 00000000b, the reference voltage is 45 mV. When the register value is 00000111 10000000b, the reference voltage is 1.129 V. The output voltage of the TPS55287 also depends on the output feedback ratio, which is either set by INTFB bit in register 04h or set by an external resistor divider.

When using internal output voltage feedback, the output voltage VOUT is calculated by Equation 8.

Equation 8. VOUT=VREFINTFB

The REF register can be configured by an I2C controller before setting the OE bit in register 06h. For 5-V output voltage, set the REF register value to 00000001 10100100b. To set the internal reference voltage, write the register 00h first, then write the register 01h.

Figure 6-15 REF_LSB
76543210
VREF
Figure 6-16 REF_MSB
15141312111098
ReservedVREF
Table 6-4 REF Register Field Descriptions
BitFieldTypeResetDescription
15-11ReservedR/W000000bReserved
10-0VREFR/W001 10100100bSets the internal reference voltage

000 00000000b = 45-mV reference voltage

000 00000001b = 45.5645-mV reference voltage

000 00000010b = 46.129-mV reference voltage

...... = ......

001 10100100b = 282-mV reference voltage (Default)

...... = ......

011 00110100b = 508-mV reference voltage

...... = ......

101 10001100b = 846-mV reference voltage

...... = ......

111 10000000b = 1129-mV reference voltage

...... = ......

111 11111110b = 1200-mV reference voltage