SLVSHR7 August   2024 TPSM8287A12M , TPSM8287A15M

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Options
  6. 5 Pin Configuration and Functions
  7. 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 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  Fixed-Frequency DCS-Control Topology
      2. 7.3.2  Forced-PWM and Power Save Modes
      3. 7.3.3  Precise Enable
      4. 7.3.4  Start-Up
      5. 7.3.5  Switching Frequency Selection
      6. 7.3.6  Output Voltage Setting
        1. 7.3.6.1 Output Voltage Setpoint
        2. 7.3.6.2 Output Voltage Range
        3. 7.3.6.3 Non-Default Output Voltage Setpoint
        4. 7.3.6.4 Dynamic Voltage Scaling (DVS)
      7. 7.3.7  Compensation (COMP)
      8. 7.3.8  Mode Selection / Clock Synchronization (MODE/SYNC)
      9. 7.3.9  Spread Spectrum Clocking (SSC)
      10. 7.3.10 Output Discharge
      11. 7.3.11 Undervoltage Lockout (UVLO)
      12. 7.3.12 Overvoltage Lockout (OVLO)
      13. 7.3.13 Overcurrent Protection
        1. 7.3.13.1 Cycle-by-Cycle Current Limiting
        2. 7.3.13.2 Hiccup Mode
        3. 7.3.13.3 Current-Limit Mode
      14. 7.3.14 Power Good (PG)
        1. 7.3.14.1 Power-Good Standalone, Primary Device Behavior
        2. 7.3.14.2 Power-Good Secondary Device Behavior
      15. 7.3.15 Remote Sense
      16. 7.3.16 Thermal Warning and Shutdown
      17. 7.3.17 Stacked Operation
    4. 7.4 Device Functional Modes
      1. 7.4.1 Power-On Reset (POR)
      2. 7.4.2 Undervoltage Lockout
      3. 7.4.3 Standby
      4. 7.4.4 On
    5. 7.5 Programming
      1. 7.5.1 Serial Interface Description
      2. 7.5.2 Standard-, Fast-, Fast-Mode Plus Protocol
      3. 7.5.3 I2C Update Sequence
      4. 7.5.4 I2C Register Reset
  9. 8 Device Registers
  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 Selecting the Input Capacitors
        2. 9.2.2.2 Selecting the Target Loop Bandwidth
        3. 9.2.2.3 Selecting the Compensation Resistor
        4. 9.2.2.4 Selecting the Output Capacitors
        5. 9.2.2.5 Selecting the Compensation Capacitor, CComp1
        6. 9.2.2.6 Selecting the Compensation Capacitor, CComp2
      3. 9.2.3 Application Curves
    3. 9.3 Typical Application Using Four TPSM8287A1xM in Parallel Operation
      1. 9.3.1 Design Requirements
      2. 9.3.2 Detailed Design Procedure
        1. 9.3.2.1 Selecting the Input Capacitors
        2. 9.3.2.2 Selecting the Target Loop Bandwidth
        3. 9.3.2.3 Selecting the Compensation Resistor
        4. 9.3.2.4 Selecting the Output Capacitors
        5. 9.3.2.5 Selecting the Compensation Capacitor, CComp1
        6. 9.3.2.6 Selecting the Compensation Capacitor, CComp2
      3. 9.3.3 Application Curves
    4. 9.4 Power Supply Recommendations
    5. 9.5 Layout
      1. 9.5.1 Layout Guidelines
      2. 9.5.2 Layout Example
  11. 10Device and Documentation Support
    1. 10.1 Device Support
      1. 10.1.1 Third-Party Products Disclaimer
    2. 10.2 Documentation Support
      1. 10.2.1 Related Documentation
    3. 10.3 Receiving Notification of Documentation Updates
    4. 10.4 Support Resources
    5. 10.5 Trademarks
    6. 10.6 Electrostatic Discharge Caution
    7. 10.7 Glossary
  12. 11Revision History
  13. 12Mechanical, Packaging, and Orderable Information
    1. 12.1 Tape and Reel Information

Package Options

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

7.3.14.1 Power-Good Standalone, Primary Device Behavior

The primary purpose of the PG pin is to indicate if the output voltage is in regulation, but the PG pin also indicates if the device is in thermal shutdown or disabled. Table 7-5 summarizes the behavior of the PG pin in a stand-alone or primary device.

Table 7-5 Power-Good Function Table
VINENVOUTSoft StartPGBLNKDVSTJPG
VIN < 2VXXXXXUndefined
VIT-(UVLO) ≥ VIN ≥ 2VXXXXXLow
VIT-(OVLO) > VIN > VIT+(UVLO)LXXXXLow
HXActiveXXLow
VOUT > VT+(OVP)

or VOUT < VT-(UVP)

Inactive0XLow

1

(DVS inactive)		XLow
X

1

(DVS active)

TJ < TSDHi-Z
VT-(OVP) > VOUT > VT+(UVP)XHi-Z
XXXTJ > TSDLow
VIN > VIT+(OVLO)XXXXXLow

Figure 7-20 shows a functional block diagram of the power-good function in a stand-alone or primary device. A window comparator monitors the output voltage, and the output of the comparator goes high if the output voltage is either less than 94% (typical) or greater than 106% (typical) of the nominal output voltage. The output of the window comparator is deglitched – the typical deglitch time is 40µs (see Figure 7-19) – and then used to drive the open-drain PG pin.

TPSM8287A12M TPSM8287A15M Power-Good Transient and Delay BehaviorFigure 7-19 Power-Good Transient and Delay Behavior

If an output under or overvoltage event occurs, the device sets the PBUV or PBOV bits in the STATUS register, respectively. The device clears the PBOV and PBUV bits if the user reads the STATUS register after the power-bad condition no longer exists.


TPSM8287A12M TPSM8287A15M Power-Good Functional Block Diagram (Standalone, Primary Device)
Figure 7-20 Power-Good Functional Block Diagram (Standalone, Primary Device)

During DVS activity, when the device transitions from one output voltage setting to another, the output voltage can temporarily exceed the limits of the window comparator and pull the PG pin low. The device has a feature to disable this behavior: if PGBLNKDVS = 1 in the CONTROL3 register, the device ignores the output of the power-good window comparator while DVS is active.

Note that the PG pin is always low – regardless of the output of the window comparator – when:

  • The device is in thermal shutdown
  • The device is in hiccup mode
  • The device is disabled
  • The device is in undervoltage or overvoltage lockout (UVLO or OVLO)
  • The device is in soft start