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Original question:

LM26480： LM26480

LM26480: LM26480

user5273610
Prodigy 50 points
Part Number: LM26480

Hi,

The Case we used is as follows:

SW1: 0.9V/135mA

SW2: 1.8V/150mA

1.How long is Start-Up to ready in these two cases?

2.Does Turnon time indicate the position of the arrow as shown below?

Thank you

  • 0
    TI__Mastermind 30260 points

    Please share a schematic of your design so I can answer your question.

    Also, which orderable part # of LM26480 are you using?

  • 0
    TI__Mastermind 30260 points

    Turn-on time is the same as ramp time.

    It is the time from VOUT = 5% to VOUT = 95% after the EN pin is set high.

    There is one exception: 

    "The enable signal may be employed immediately after VIN is applied to the device. However, VIN must be stable for approximately 8 ms before enable single be asserted high to ensure internal bias, reference, and the flexible POR timing are stabilized. This initial delay is necessary only upon first time device power on."

    If EN is tied to VIN, then there will be a delay of approximately 8ms from when EN is high to when the SW1/2 converter turns on. However, the TON spec is still valid from 5% to 95% VOUT.