SLVSGG8 November   2023 TPS6287B10 , TPS6287B25

PRODMIX  

  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 Parameter Measurement Information
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Fixed-Frequency DCS-Control Topology
      2. 8.3.2  Forced-PWM and Power-Save Modes
      3. 8.3.3  Transient Non-Synchronous Mode (optional)
      4. 8.3.4  Precise Enable
      5. 8.3.5  Start-Up
      6. 8.3.6  Output Voltage Setting
        1. 8.3.6.1 Output Voltage Range
        2. 8.3.6.2 Output Voltage Setpoint
        3. 8.3.6.3 Non-Default Output Voltage Setpoint
        4. 8.3.6.4 Dynamic Voltage Scaling
        5. 8.3.6.5 Droop Compensation
      7. 8.3.7  Compensation (COMP)
      8. 8.3.8  Mode Selection / Clock Synchronization (MODE/SYNC)
      9. 8.3.9  Spread Spectrum Clocking (SSC)
      10. 8.3.10 Output Discharge
      11. 8.3.11 Undervoltage Lockout (UVLO)
      12. 8.3.12 Overvoltage Lockout (OVLO)
      13. 8.3.13 Overcurrent Protection
        1. 8.3.13.1 Cycle-by-Cycle Current Limiting
        2. 8.3.13.2 Hiccup Mode
        3. 8.3.13.3 Current-Limit Mode
      14. 8.3.14 Power Good (PG)
        1. 8.3.14.1 Standalone / Primary Device Behavior
        2. 8.3.14.2 Secondary Device Behavior
      15. 8.3.15 Remote Sense
      16. 8.3.16 Thermal Warning and Shutdown
      17. 8.3.17 Stacked Operation
    4. 8.4 Device Functional Modes
      1. 8.4.1 Power-On Reset
      2. 8.4.2 Undervoltage Lockout
      3. 8.4.3 Standby
      4. 8.4.4 On
    5. 8.5 Programming
      1. 8.5.1 Serial Interface Description
      2. 8.5.2 Standard-, Fast-, Fast-Mode Plus Protocol
      3. 8.5.3 HS-Mode Protocol
      4. 8.5.4 I2C Update Sequence
      5. 8.5.5 I2C Register Reset
      6. 8.5.6 Dynamic Voltage Scaling (DVS)
  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 Inductor Selection
        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 Typical Application - TPS6287BxV Devices
      1. 9.3.1 Design Requirements for TPS6287BxV
    4. 9.4 Typical Application Using Two TPS6287B25 in a Stacked Configuration
      1. 9.4.1 Design Requirements For Two Stacked Devices
      2. 9.4.2 Detailed Design Procedure
        1. 9.4.2.1 Selecting the Compensation Resistor
        2. 9.4.2.2 Selecting the Output Capacitors
        3. 9.4.2.3 Selecting the Compensation Capacitor CC
      3. 9.4.3 Application Curves for Two Stacked Devices
    5. 9.5 Typical Application Using Three TPS6287B25 in a Stacked Configuration
      1. 9.5.1 Application Curves
    6. 9.6 Power Supply Recommendations
    7. 9.7 Layout
      1. 9.7.1 Layout Guidelines
      2. 9.7.2 Layout Example
  11. 10Device and Documentation Support
    1. 10.1 Documentation Support
      1. 10.1.1 Related Documentation
    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. 11Device Registers
  13. 12Revision History
  14. 13Mechanical, Packaging, and Orderable Information

Package Options

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

9.4.1 Design Requirements For Two Stacked Devices

Table 9-6 lists the operating parameters for this application example.

Table 9-6 Design Parameters
SYMBOL PARAMETER VALUE
VIN Input voltage 3.3 V
VOUT Output voltage 0.75 V
TOLVOUT Output voltage tolerance allowed by the application ±4%
TOLDC Output voltage tolerance of the TPS6287B25 (DC accuracy) ±0.8%
ΔIOUT Output current load step ±24 A
tr Load step rise time 1 μs
tf Load step fall time 1 μs
fSW Switching frequency 1.5 MHz
L Inductance 105 nH
gm Error amplifier transconductance 1.5 mS
τ Emulated current time constant 12.5 μs
kBW Ratio of switching frequency to converter bandwidth (must be ≥4) 4

NΦ

Number of phases (number of stacked devices)

2
kCOUT Ratio of minimum to maximum output capacitance (typically 2) 2

RPG

Pullup resistor on power-good output

10 kΩ
REN Pullup resistor on enable 22 kΩ
RSCL, RSDA Pullup resistors on SDA and SCL 680 Ω

Preliminary Calculations

With a total allowable output voltage tolerance of ±4% and a maximum DC error of ±0.8%, the allowable output voltage tolerance during a load step is given by:

Equation 22. ∆ V O U T = ± V O U T × ( T O L   V O U T   – T O L D C )
Equation 23. ∆ V O U T = ± 0.75 × ( 0.04   – 0.008 )   =   ± 24   m V