SLVSH20B October   2023  – May 2024 TPSM86837 , TPSM86838

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 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical 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  The Adaptive On-Time Control and PWM Operation
      2. 6.3.2  Mode Selection
        1. 6.3.2.1 FCCM Control and Eco-mode Control
      3. 6.3.3  Soft Start and Prebiased Soft Start
      4. 6.3.4  Enable and Adjusting Undervoltage Lockout
      5. 6.3.5  Output Overcurrent Limit and Undervoltage Protection
      6. 6.3.6  Overvoltage Protection
      7. 6.3.7  UVLO Protection
      8. 6.3.8  Thermal Shutdown
      9. 6.3.9  Output Voltage Discharge
      10. 6.3.10 Power Good
      11. 6.3.11 Large Duty Operation
    4. 6.4 Device Functional Modes
      1. 6.4.1 Standby Operation
      2. 6.4.2 Light Load Operation
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
        1. 7.2.2.1 Output Voltage Resistors Selection
        2. 7.2.2.2 Output Filter Selection
        3. 7.2.2.3 Input Capacitor Selection
      3. 7.2.3 Application Curves
    3. 7.3 Power Supply Recommendations
      1. 7.3.1 Application Thermal Considerations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Device Support
      1. 8.1.1 Third-Party Products Disclaimer
    2. 8.2 Documentation Support
      1. 8.2.1 Related Documentation
    3. 8.3 Receiving Notification of Documentation Updates
    4. 8.4 Support Resources
    5. 8.5 Trademarks
    6. 8.6 Electrostatic Discharge Caution
    7. 8.7 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

Package Options

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

6.1 Overview

The TPSM8683x is an easy-to-use, synchronous buck DC/DC power module designed for a wide variety of applications where reliability, small design size, and low EMI signature are of paramount importance. With integrated power MOSFETs, a shielded buck inductor, and basic passives, the TPSM8683x is a 8A synchronous buck module operating from 4.5V to 28V input voltage (VIN), and the output voltage ranges from 0.6V to 5.5V. The proprietary D-CAP3 control mode enables low external component count, ease of design, optimization of the power design for power, size, and efficiency. The device employs D-CAP3 control mode that provides fast transient response with no external compensation components and an accurate feedback voltage. TPSM86837 operates in Eco-mode to attain high efficiency at light load. TPSM86838 operates in FCCM mode which has the quasi-fixed switching frequency at both light and heavy load. The TPSM8683x is able to adapt both low equivalent series resistance (ESR) output capacitors such as POSCAP or SP-CAP, and ultra-low ESR ceramic capacitors.

The TPSM8683x incorporates specific features to improve EMI performance in noise-sensitive applications:

  • An optimized package and pinout design enables a shielded switch-node layout that mitigates radiated EMI.
  • Parallel input and output paths with symmetrical capacitor layouts minimize parasitic inductance, switch voltage ringing, and radiated field coupling
  • Integrated power MOSFETs with enhanced gate drive control enable low-noise PWM switching.

The TPSM8683x module also includes inherent protection features for robust system requirements:

  • An open-drain PGOOD indicator for power-rail sequencing and fault reporting
  • Precision enable input with hysteresis, providing programmable non-latched input undervoltage lockout (UVLO)
  • Non-latched overvoltage protections
  • Hiccup-mode overcurrent protection with cycle-by-cycle valley current limits
  • Thermal shutdown with automatic recovery.

Leveraging a pin arrangement designed for simple layout that requires only a few external components, the TPSM8683x is specified to maximum junction temperatures of 150°C.