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TPS54260: Boot charge about TPS54260

Ted Zhang
Intellectual 2280 points
Part Number: TPS54260

Below is the TPS54260 block diagram about its boot charge circuit. If the boot charge is a ldo, according to what  I test in EVM, the output of the boot charge is nearly 6V. Then it is a 3.5V-60V input, 6V output LDO?

  • 0
    TI__Intellectual 2280 points
    In light load or no load, what will happen to the boot to ground voltage when the input voltage decrease? I did a test on the EVM with 5V ouput and 5mA load, the boot to ground voltage stays at 6V when input voltage is above 8.3V. When input voltage<8.2V, then it decreases proportional to the input voltage. Why is 8.3V and why is that?
  • 0 in reply to Ted Zhang
    TI__Guru**** 191445 points
    The OOT charge circuit is essentially a current source from VIN that charges BOOT up to about 6 V. At that point a comparator and some level shifters turn off the current source. At lower input voltages, the BOOT voltage will be less than 6 V as there is some voltage drop across the BOOT charge circuit. In light load conditions there is an effect you need to know about. All the info is contained here:

    www.ti.com/.../slva547