ZHCSNR7A March   2022  – August 2022 TPS55289

PRODUCTION DATA  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    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 Timing Characteristics
    7. 6.7 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  VCC Power Supply
      2. 7.3.2  EXTVCC Power Supply
      3. 7.3.3  Operation Mode Setting
      4. 7.3.4  Input Undervoltage Lockout
      5. 7.3.5  Enable and Programmable UVLO
      6. 7.3.6  Soft Start
      7. 7.3.7  Shutdown and Load Discharge
      8. 7.3.8  Switching Frequency
      9. 7.3.9  Switching Frequency Dithering
      10. 7.3.10 Inductor Current Limit
      11. 7.3.11 Internal Charge Path
      12. 7.3.12 Output Voltage Setting
      13. 7.3.13 Output Current Monitoring and Cable Voltage Droop Compensation
      14. 7.3.14 Output Current Limit
      15. 7.3.15 Overvoltage Protection
      16. 7.3.16 Output Short Circuit Protection
      17. 7.3.17 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 PWM Mode
      2. 7.4.2 Power Save Mode
    5. 7.5 Programming
      1. 7.5.1 Data Validity
      2. 7.5.2 START and STOP Conditions
      3. 7.5.3 Byte Format
      4. 7.5.4 Acknowledge (ACK) and Not Acknowledge (NACK)
      5. 7.5.5 Target Address and Data Direction Bit
      6. 7.5.6 Single Read and Write
      7. 7.5.7 Multiread and Multiwrite
    6. 7.6 Register Maps
      1. 7.6.1 REF Register (Address = 0h, 1h)
      2. 7.6.2 IOUT_LIMIT Register (Address = 2h) [reset = 11100100h]
      3. 7.6.3 VOUT_SR Register (Address = 3h) [reset = 00000001h]
      4. 7.6.4 VOUT_FS Register (Address = 4h) [reset = 00000011h]
      5. 7.6.5 CDC Register (Address = 5h) [reset = 11100000h]
      6. 7.6.6 MODE Register (Address = 6h) [reset = 00100000h]
      7. 7.6.7 STATUS Register (Address = 7h) [reset = 00000011h]
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Switching Frequency
        2. 8.2.2.2 Output Voltage Setting
        3. 8.2.2.3 Inductor Selection
        4. 8.2.2.4 Input Capacitor
        5. 8.2.2.5 Output Capacitor
        6. 8.2.2.6 Output Current Limit
        7. 8.2.2.7 Loop Stability
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 第三方产品免责声明
    2. 11.2 接收文档更新通知
    3. 11.3 支持资源
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 术语表
  12. 12Mechanical, Packaging, and Orderable Information

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

REF is shown in Figure 7-15 and Figure 7-16 and described in Table 7-4.

Return to Summary Table.

REF sets the internal reference voltage of the TPS55289. 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. 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 TPS55289 also depends on the output feedback ratio, which is either set by INTFB bit in register 04h or set by an external resistor divider. The default REF = 282 mV.

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 7-15 REF_LSB
7 6 5 4 3 2 1 0
VREF
Figure 7-16 REF_MSB
15 14 13 12 11 10 9 8
Reserved VREF
Table 7-4 REF Register Field Descriptions
Bit Field Type Reset Description
15-11 Reserved R/W 000000b Reserved
10-0 VREF R/W 001 10100100b Sets 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

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

011 00110100b = 508-mV reference voltage

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

101 10001100b = 846-mV reference voltage

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

111 10000000b = 1129-mV reference voltage

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

111 11111110b = 1200-mV reference voltage