TIDT274 April   2022

 

  1.   Description
  2.   Features
  3.   Applications
  4. 1Test Prerequisites
    1. 1.1 Voltage and Current Requirements
    2. 1.2 Considerations
    3. 1.3 Dimensions
  5. 2Testing and Results
    1. 2.1 Efficiency Graphs
    2. 2.2 Load Regulation
    3. 2.3 Thermal Images
    4. 2.4 Bode Plots
  6. 3Waveforms
    1. 3.1 Switching
      1. 3.1.1 Switchnode to GND
      2. 3.1.2 Switchnode to –VOUT
    2. 3.2 Input Voltage Ripple
    3. 3.3 Output Voltage Ripple
    4. 3.4 Load Transients
    5. 3.5 Start-Up Sequence
    6. 3.6 Shutdown Sequence

Description

This tiny inverting buck boost provides negative voltage up to –45 V out of input voltage 5.2 V for light detection and ranging (LIDAR) applications. Maximum load current is limited here to 120 mA – for bigger loads, use the TPS54260 or TPS54360 devices. Those buck devices are well suited to cover the needed high duty cycle range and easily start up well below 5-V input.