SLVSGC5E January   2023  – October 2025 TPS62870 , TPS62871 , TPS62872 , TPS62873

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 Timing Requirements
    8. 6.8 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 Range
        2. 7.3.6.2 Output Voltage Setpoint
        3. 7.3.6.3 Non-Default Output Voltage Setpoint
        4. 7.3.6.4 Dynamic Voltage Scaling
      7. 7.3.7  Compensation (COMP)
      8. 7.3.8  Mode Selection and 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 Standalone or Primary Device Behavior
        2. 7.3.14.2 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
      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 Register Map
  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 Inductor
        2. 9.2.2.2 Selecting the Input Capacitors
        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, CC
        6. 9.2.2.6 Selecting the Compensation Capacitor, CC2
      3. 9.2.3 Application Curves
    3. 9.3 Best Design Practices
    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 Receiving Notification of Documentation Updates
    3. 10.3 Support Resources
    4. 10.4 Trademarks
    5. 10.5 Electrostatic Discharge Caution
    6. 10.6 Glossary
  12. 11Revision History
  13. 12Mechanical, Packaging, and Orderable Information

Package Options

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

9.2.1 Design Requirements

Table 9-1 lists the operating parameters for this application example.

Table 9-1 Design Parameters
SYMBOL PARAMETER VALUE
VIN Input voltage 3.3V
VOUT Output voltage 0.75V
TOLVOUT Output voltage tolerance allowed by the application ±3.3%
TOLDC Output voltage tolerance of the TPS6287x (DC accuracy) ±1%
ΔIOUT Output current load step ±7.5A (from 3.8A to 11.3A)
tt Load step transition time 1μs
fSW Switching frequency 2.25MHz
L Inductance 110nH
TOLIND Inductor tolerance ±20%
gm Error amplifier transconductance 1.5mS
τ Internal timing parameter 12.5μs
TOLτ Tolerance of the internal timing parameter ±30%
kBW Ratio of switching frequency to converter bandwidth (must be ≥ 4) 4
Nɸ Number of phases 1

Preliminary Calculations

The maximum allowable deviation of the power supply is ±3.3%. The DC accuracy of the TPS6287x is specified as ±1%, therefore, the maximum output voltage variation during a transient is given by:

Equation 6. ∆VOUT=±VOUT×(3.3% –1%)=±17.25mV