SLVSHB5A October   2024  – November 2024 TPS61287

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 Enable and Start-up
      2. 6.3.2 Undervoltage Lockout (UVLO)
      3. 6.3.3 Programmable EN/UVLO
      4. 6.3.4 Switching Valley Current Limit
      5. 6.3.5 External Clock Synchronization
      6. 6.3.6 Stackable Multi-phase Operation
      7. 6.3.7 Device Functional Modes
        1. 6.3.7.1 Forced PWM Mode
        2. 6.3.7.2 Auto PFM Mode
      8. 6.3.8 Overvoltage Protection
      9. 6.3.9 Thermal Shutdown
  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 Setting Output Voltage
        2. 7.2.2.2 Inductor Selection
        3. 7.2.2.3 Bootstrap And VCC Capacitors Selection
        4. 7.2.2.4 MOSFET Selection
        5. 7.2.2.5 Input Capacitor Selection
        6. 7.2.2.6 Output Capacitor Selection
        7. 7.2.2.7 Loop Stability
      3. 7.2.3 Application Curves
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
        1. 7.4.2.1 Thermal Considerations
  9. 8 Device and Documentation Support
    1. 8.1 Receiving Notification of Documentation Updates
    2. 8.2 Support Resources
    3. 8.3 Trademarks
    4. 8.4 Electrostatic Discharge Caution
    5. 8.5 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

6.1 Overview

The TPS61287 is a high-power density, synchronous boost converter that integrates the high side synchronous rectifier MOSFET and uses an external low side MOSFET to provide a high efficiency and small size solution. The TPS61287 has a wide input voltage range from 2.0V to 23V and the output voltage covers up to 25V with 20A switching valley current capability.

The TPS61287 uses an adaptive constant on-time valley current control topology to regulate the output voltage. Under moderate to heavy load condition, the TPS61287 operates in pulse width modulation (PWM) mode. There are two optional modes in light load by configuring the MODE pin: Auto PFM mode to improve light-load efficiency and Forced PWM to avoid audible noise and other problems caused by low switching frequency. The switching frequency in the PWM mode is 320kHz. The TPS61287 provides 27V output overvoltage protection, cycle-by-cycle overcurrent protection, and thermal shutdown protection.

The TPS61287 supports stackable multi-phase operation. Two TPS61287 can build a stackable dual-phase converter. Furthermore, up to 4 pcs TPS61287 can be configured for multi-phase operation at same switching frequency to support higher power and inductor current balancing. Multi-phase operation greatly reduces peak inductor current, and capacitor ripple current, and increases effective switching frequency, minimizing inductor and capacitor sizes.

The TPS61287 offers a very small solution size with 2.5mm x 3.0mm VQFN HotRod™ Lite package with minimal external components.