ZHCSQI6A May   2022  – July 2022 TPS62870-Q1 , TPS62871-Q1 , TPS62872-Q1 , TPS62873-Q1

PRODUCTION DATA  

  1. 特性
  2. 应用
  3. 说明
  4. Revision History
  5. 说明(续)
  6. Device Options
  7. Pin Configuration and Functions
  8. Specifications
    1. 8.1 Absolute Maximum Ratings
    2. 8.2 ESD Ratings
    3. 8.3 Recommended Operating Conditions
    4. 8.4 Thermal Information
    5. 8.5 Electrical Characteristics
    6. 8.6 I2C Interface Timing Characteristics
    7. 8.7 Timing Requirements
    8. 8.8 Typical Characteristics
  9. Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1  Fixed-Frequency DCS Control Topology
      2. 9.3.2  Forced PWM and Power Save Modes
      3. 9.3.3  Precise Enable
      4. 9.3.4  Start-Up
      5. 9.3.5  Switching Frequency Selection
      6. 9.3.6  Output Voltage Setting
        1. 9.3.6.1 Output Voltage Range
        2. 9.3.6.2 Output Voltage Setpoint
        3. 9.3.6.3 Non-Default Output Voltage Setpoint
        4. 9.3.6.4 Dynamic Voltage Scaling
      7. 9.3.7  Compensation (COMP)
      8. 9.3.8  Mode Selection and Clock Synchronization (MODE/SYNC)
      9. 9.3.9  Spread Spectrum Clocking (SSC)
      10. 9.3.10 Output Discharge
      11. 9.3.11 Undervoltage Lockout (UVLO)
      12. 9.3.12 Overvoltage Lockout (OVLO)
      13. 9.3.13 Overcurrent Protection
        1. 9.3.13.1 Cycle-by-Cycle Current Limiting
        2. 9.3.13.2 Hiccup Mode
        3. 9.3.13.3 Current Limit Mode
      14. 9.3.14 Power Good (PG)
        1. 9.3.14.1 Standalone or Primary Device Behavior
        2. 9.3.14.2 Secondary Device Behavior
      15. 9.3.15 Remote Sense
      16. 9.3.16 Thermal Warning and Shutdown
      17. 9.3.17 Stacked Operation
    4. 9.4 Device Functional Modes
      1. 9.4.1 Power-On Reset
      2. 9.4.2 Undervoltage Lockout
      3. 9.4.3 Standby
      4. 9.4.4 On
    5. 9.5 Programming
      1. 9.5.1 Serial Interface Description
      2. 9.5.2 Standard, Fast, Fast Mode Plus Protocol
      3. 9.5.3 I2C Update Sequence
    6. 9.6 Register Map
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
        1. 10.2.2.1 Selecting the Inductor
        2. 10.2.2.2 Selecting the Input Capacitors
        3. 10.2.2.3 Selecting the Compensation Resistor
        4. 10.2.2.4 Selecting the Output Capacitors
        5. 10.2.2.5 Selecting the Compensation Capacitor, CC
        6. 10.2.2.6 Selecting the Compensation Capacitor, CC2
      3. 10.2.3 Application Curves
    3. 10.3 Best Design Practices
    4. 10.4 Power Supply Recommendations
    5. 10.5 Layout
      1. 10.5.1 Layout Guidelines
      2. 10.5.2 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 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 接收文档更新通知
    4. 11.4 支持资源
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 术语表
  12. 12Mechanical, Packaging, and Orderable Information

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机械数据 (封装 | 引脚)
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订购信息

Selecting the Inductor

The TPS6287x-Q1 devices have been optimized for inductors in the range 50 nH to 300 nH. If the transient response of the converter is limited by the slew rate of the current in the inductor, using a smaller inductor can improve performance. However, the output ripple current increases as the value of the inductor decreases, and higher output current ripple generates higher output voltage ripple, which adds to the transient overshoot or undershoot. The optimal configuration for a given application is always a trade-off between a number of parameters. A starting value of 110 nH for typical applications is recommended.

The peak-to-peak inductor current ripple is given by:

Equation 5. I L ( P P ) = V O U T V I N V I N     V O U T L × f s w
Equation 6. I L ( P P ) = 0.75 3.3 3.3   0.75 110 × 10 9 × 2.25 × 10 6 = 2.342   A

Table 10-2 lists a number of inductors suitable for use with this application. This list is not exhaustive and other inductors from other manufacturers can also be suitable.

Table 10-2 List of Recommended Inductors
Inductance Current RatingDimensionsDC ResistancePart Number(1)
(ISAT at 25°C) (L × W × H)
92 nH24 A4 × 4 × 1.2 mm5.2 mΩ (typical)Coilcraft, XEL4012-920NE
100 nH30 A4 × 4 × 3.2 mm1.5 mΩ (typical)Coilcraft, XEL4030-101ME
110 nH 29 A 4 × 4 × 2.1 mm 1.4 mΩ (typical) Coilcraft, XGL4020-111ME
110 nH 29 A 3.2 × 2.5 × 2.5 mm 1.9 mΩ (typical) TDK, CLT32-R11
55 nH 39.5 A 3.2 × 2.5 × 2.5 mm 1.0 mΩ (typical) TDK, CLT32-55N
110 nH 17.0 A 3.2 × 2.5 × 2.5 mm 3.0 mΩ (typical) Cyntec, VCTA32252E-R11MS6
100 nH 25 A 4.2 × 4.0 × 2.1 mm 1.9 mΩ (typical) Cyntec, VCHA042A-R10MS62M
100 nH 44 A 5.45 × 5.25 × 2.8 mm 0.8 mΩ (typical) Cyntec, VCHW053T-R10NMS5