SLVU953A October   2013  – May 2021 TPS65580 , TPS65581

 

  1.   Trademarks
  2. 1Introduction
  3. 2Performance Specification Summary
  4. 3Modifications
    1. 3.1 Output Voltage Setpoint
  5. 4Test Setup and Results
    1. 4.1 Input/Output Connections
    2. 4.2 Start-Up Procedure
    3. 4.3 Efficiency
    4. 4.4 Load Regulation
    5. 4.5 Line Regulation
    6. 4.6 Load Transient Response
    7. 4.7 Input Voltage Ripple
    8. 4.8 Start-Up
  6. 5Board Layout
    1. 5.1 Layout
  7. 6Schematic, Bill of Materials, and Reference
    1. 6.1 Schematic
    2. 6.2 Bill of Materials
    3. 6.3 Reference
  8. 7Revision History

1 Introduction

The TPS65581 is a triple output, advanced D-CAP2™-mode, synchronous buck converter requiring a very low external component count. The advanced D-CAP2 control circuit is optimized for low-ESR output capacitors such as POSCAP, SP-CAP, or ceramic types and features fast transient response with no external compensation. The switching frequency is internally set at a nominal 700 kHz. The high-side and low-side switching MOSFETs are incorporated inside the TPS65580 package along with the gate-drive circuitry. The low drain-to-source on resistance of the MOSFETs allows the TPS65580 to achieve high efficiencies and helps keep the junction temperature low at high output currents. The TPS65580 dc/dc synchronous converter is designed to provide up to 1.5-A, 2.5-A and 1.5-A output for each of 3 channels from an input voltage source of 4.5 V to 18 V. The output voltage range is from 0.76 V to 6.5 V. Rated input voltage, output voltage and output current ranges for the evaluation module are given in Table 1-1. This user’s guide describes the TPS65581EVM-575 performance.

Table 1-1 Input Voltage and Output Current Summary
EVMInput Voltage RangeChannelOutput VoltageOutput Current Range
TPS65581EVM-575VIN = 4.5 V to 18 VCH13.3 V0-A to 1.5-A
CH21.2 V0-A to 2.5-A
CH31.5 V0-A to 1.5-A