SNVSAZ4A February   2021  – March 2021 TPS541620

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 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 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Fixed-Frequency, Internally Compensated Advanced-Current-Mode Control
      2. 7.3.2  Enable and UVLO
      3. 7.3.3  Internal LDO
      4. 7.3.4  Pre-biased Output Start-up
      5. 7.3.5  Current Sharing
      6. 7.3.6  Frequency Selection and Minimum On-Time and Off-Time
      7. 7.3.7  Ramp Compensation Selection
      8. 7.3.8  Soft Start
      9. 7.3.9  Remote Sense Function
      10. 7.3.10 Adjustable Output Voltage
      11. 7.3.11 Power Good
      12. 7.3.12 Overcurrent Protection
      13. 7.3.13 Overvoltage and Undervoltage Protection
      14. 7.3.14 Overtemperature Protection
      15. 7.3.15 Frequency Synchronization
    4. 7.4 Device Functional Modes
      1. 7.4.1 Operation Mode
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application - Dual Independent Outputs
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1  Switching Frequency
        2. 8.2.2.2  Output Inductor Selection
        3. 8.2.2.3  Output Capacitor
        4. 8.2.2.4  Input Capacitor
        5. 8.2.2.5  Output Voltage Resistors Selection
        6. 8.2.2.6  Adjustable Undervoltage Lockout
        7. 8.2.2.7  Bootstrap Capacitor Selection
        8. 8.2.2.8  BP5 Capacitor Selection
        9. 8.2.2.9  PGOOD Pullup Resistor
        10. 8.2.2.10 Current Limit
        11. 8.2.2.11 Soft-Start Time Selection
        12. 8.2.2.12 MODE1 and MODE2 Pins
      3. 8.2.3 Application Curves
      4. 8.2.4 Typical Application - 2-Phase Operation
        1. 8.2.4.1 Design Requirements
        2. 8.2.4.2 Detailed Design Procedure
          1. 8.2.4.2.1  Switching Frequency
          2. 8.2.4.2.2  Output Inductor Selection
          3. 8.2.4.2.3  Output Capacitor
          4. 8.2.4.2.4  Input Capacitor
          5. 8.2.4.2.5  Output Voltage Resistors Selection
          6. 8.2.4.2.6  Adjustable Undervoltage Lockout
          7. 8.2.4.2.7  Bootstrap Capacitor Selection
          8. 8.2.4.2.8  BP5 Capacitor Selection
          9. 8.2.4.2.9  PGOOD Pullup Resistor
          10. 8.2.4.2.10 Current Limit
          11. 8.2.4.2.11 Soft-Start Time Selection
          12. 8.2.4.2.12 MODE1 Pin
        3. 8.2.4.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
      1. 10.2.1 Thermal Performance
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Support Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

7.1 Overview

The TPS541620 regulator is an easy-to-use, dual-output, synchronous step-down DC-DC converter that operates 4.5-V to 15-V supply voltage. The device is capable of delivering up to 6-A DC load current per output with exceptional efficiency and thermal performance in a very small solution size. The device is highly configurable where two outputs can be combined to deliver up to 12 A. When the TPS541620 operates in multi-phase mode, phase interleaving enables the following:

  • Input and output current and voltage ripple reduction
  • Reduced RMS current power dissipation
  • Better transient performance
  • Use of a small inductor to save board space and cost

The TPS541620 uses a fixed-frequency, internally compensated advanced current mode control, which reduces design time and requires fewer external components. The switching frequency, internal compensation, and phase operation can be configured using pin strapping. MODE1 (pin 9) configures the phase operation. Table 7-3 shows the resistor values that are required to configure the phase operation and phase offset. The switching frequency can be selected from preset values through pin-strapping on MODE2 (pin 10). Four switching frequency options are available:

  • 500 kHz
  • 1.0 MHz
  • 1.5 MHz
  • 2.0 MHz
Each switching frequency has four options of ramp amplitude to optimize the loop bandwidth performance. The TPS541620 is also capable of synchronization to an external clock. The wide switching frequency option allows the device to meet a wide range of design requirements. It can be optimized to a small solution size with higher frequency or to high efficiency with lower switching frequency. Applications with switching frequency of 1.5 MHz and above can show a minor non-monotonic behavior at the beginning of start-up.

The TPS541620 also features the following:

  • Open-drain power-good (PGOOD) flag
  • Precision enable
  • Internal or adjustable soft start time
  • Start-up into pre-bias voltage
It provides a flexible and easy-to-use solution for a wide range of applications. Protection features include the following:
  • Thermal shutdown
  • BP5 undervoltage lockout
  • Cycle-by-cycle current limiting
  • Short-circuit hiccup protection
The device pinout is optimized for simple, optimum PCB layout for EMI and thermal performance. The TPS541620 is available in a 3-mm × 5-mm lead-less package.