SLVAFQ0 October   2025 TPS61299

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Start-up
    1. 2.1 Body Diode Pass
    2. 2.2 Pre-Charge
    3. 2.3 Down Mode
  6. 3Output Short Protection
    1. 3.1 Continuous Reboot
      1. 3.1.1 Continuous Reboot by Pre-charge
      2. 3.1.2 Continuous Reboot by Down Mode
    2. 3.2 Hiccup Reboot
      1. 3.2.1 Hiccup Reboot by Pre-charge
      2. 3.2.2 Hiccup Reboot by Down Mode
    3. 3.3 Boost Converter Short-Circuit Protection Behavior Summary
  7. 4Boost Converter Start-Up Behavior Summary
  8. 5References

3.1.2 Continuous Reboot by Down Mode

TI boost devices with down-mode start-up multiplex the start-up strategy during output short conditions (TPS61299). Whenever output voltage drops below the input, the device enters down mode. ILIMIT limits the inductor current until Vout drops below 0.5V. After that, the soft start-up current limit applies and clamps the current peak to 350mA. Figure 3-3 show the output short behavior.

TPS61299 Into Short-Circuit Waveform Figure 3-3 TPS61299 Into Short-Circuit Waveform

The device stays in down-mode start-up procedure until the short circuit releases and the device can start up.

TPS61299 Short-Circuit Release Waveform Figure 3-4 TPS61299 Short-Circuit Release Waveform