SLVSI72A April   2025  – October 2025 TPS55285

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 Recommended Operating Conditions
    3. 5.3 Thermal Information
    4. 5.4 Electrical Characteristics
    5. 5.5 I2C Timing Characteristics
    6. 5.6 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  Default Output Enable(OE) bit Status
      3. 6.3.3  Input Undervoltage Lockout
      4. 6.3.4  Enable and Programmable UVLO
      5. 6.3.5  Soft Start
      6. 6.3.6  Shutdown and Load Discharge
      7. 6.3.7  Switching Frequency
      8. 6.3.8  Switching Frequency Dithering
      9. 6.3.9  Inductor Current Limit
      10. 6.3.10 Internal Charge Path
      11. 6.3.11 Output Voltage Setting
      12. 6.3.12 Output Current Limit
      13. 6.3.13 Output Cable Voltage Drop Compensation
      14. 6.3.14 Input Overvoltage Protection
      15. 6.3.15 Output 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 Multi-Read and Multi-Write
  8. 7 Register Maps
    1. 7.1 REF Register (Address = 0h, 1h) [reset = 10100100b, 00000001b]
    2. 7.2 IOUT_LIMIT Register (Address = 2h) [reset = 11100100b]
    3. 7.3 VOUT_SR Register (Address = 3h) [reset = 00000001b]
    4. 7.4 VOUT_FS Register (Address = 4h) [reset = 00000011b]
    5. 7.5 CDC Register (Address = 5h) [reset = 11110000b]
    6. 7.6 MODE Register (Address = 6h) [reset = 00100000b]
    7. 7.7 STATUS Register (Address = 7h) [reset = 00000001b]
    8. 7.8 Register Summary
  9. 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
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 Third-Party Products Disclaimer
      2. 9.1.2 Development Support
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

7.7 STATUS Register (Address = 7h) [reset = 00000001b]

STATUS is shown in Figure 7-8 and described in Table 7-9.

Return to Summary Table.

The STATUS register stores the operating status of the TPS55285. When any of the SCP bit, the OCP bit, the OVP bit or the TSD bit are set, and the corresponding mask bit in register 05h is set as well, the FB/INT pin outputs low logic level to indicate the situation. Reading register 07h clears the SCP bit, OCP bit, OVP bit and TSD bit. The FB/INT pin status and SCP bit, OCP bit, OVP bit or TSD bit are reset until the register 07h is read. If the fault situation still exists, the corresponding bit and FB/INT pin is set again.

Figure 7-8 STATUS Register
76543210
SCPOCPOVPTSDReservedReservedSTATUS
R-0bR-0bR-0bR-0bR-0bR-0bR-11b
Table 7-9 STATUS Register Field Descriptions
BitFieldTypeResetDescription
7SCPR0bShort circuit protection

0b = No short circuit

1b = Short circuit happens. Does not reset until it is read.

6OCPR0bOvercurrent protection

0b = No output overcurrent

1b = Output current hits the current limit. Does not reset until it is read.

5OVPR0bOvervoltage protection

0b = No OVP

1b = Output voltage exceeds the OVP threshold. Does not reset until it is read.

4TSDR0bThermal shutdown protection

0b = No TSD

1b = Thermal shutdown happens. Does not reset until it is read

3RESERVEDR0bReserved
2RESERVEDR0bReserved
1-0STATUSR01bOperating status

00b = Boost

01b = Buck

10b = Buck-Boost

11b = Reserved