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Frequent questions

  • [FAQ] LM388x: What is the FLAG output of the LM388x if there is no voltage applied to VCC/VIN?

    Other Parts Discussed in Thread: LM3880 , LM3881 The output will be high impedances. Figure 10 for the LM3880 datasheet and Figure 6 on the LM3881 datasheet shows FLAG following VCC. For more LM388x FAQ click or type the tag in the search bar [FAQ…

  • [FAQ] LM388x: Does LM388x have a chance to enable the external power rail during its initialization?

    As show in the data sheet VFLAG vs VIN (VCC), the FLAG voltage will be pulled low when VCC exceeds about 0.8V. The FLAG voltage reaches about 0.65v before true pulldown begins. The external power rail shall not be on if its enable threshold is above 0…

  • [FAQ] 388x: What is the behavior of the FLAG outputs if while EN signal stays asserted, VCC ramps down below its minimum operating voltage?

    The behaviors of the device are unpredictable if EN stays asserted while VC ramps down below its minimum operating voltage. For more LM388x FAQ click or type the tag in the search bar [FAQ] LM388x

  • [FAQ] LM388x: Is it good practice to connect EN pin to VCC?

    Connecting the EN pin to VCC is not recommended. During power up, the EN voltage should be kept below the EN threshold until VCC rises above the minimum operating voltage. An undefined operation at the FLAG outputs can occur if EN is connected to VCC…

  • [FAQ] LM388x: What's the test condition for the question current?

    The test condition is that VCC=3.3 V and EN=3.3V. So it is an operating current when EN is high. For more LM388x FAQ click or type the tag in the search bar [FAQ] LM388x

  • [FAQ] LM388x: If the glitch occurs at EN pin, does it impact the FLAG output?

    EN pin has a glitch free operation. The first timer will start counting at a rising threshold of EN, but will always reset if the EN pin is de-asserted before the first output FLAG is released. Please refer section 7.3.1 of https://www.ti.com/lit/ds/symlink…

  • [FAQ] Does TI have crosses for obsolete Intel Enpirion DC/DC switching regulators and power modules?

    I am currently using several Enpirion switching regulators and power modules in my designs. However, it was recently announced that Intel will be obsoleting this entire portfolio. Does TI have crosses for these Enpirion devices?

  • [FAQ] What are the differences between the dual channel isolated gate drivers?

    Part Number: UCC21520 Other Parts Discussed in Thread: UCC20520 , , UCC21521 , UCC21530 , UCC20225 , UCC21225A , UCC21220 , UCC21222 , UCC21540 , UCC21541 , UCC21542 Part UCC20520 UCC21520/A UCC21521/A/C UCC21530 UCC21320 UCC20225…

  • [FAQ] BQ25883: [FAQ]BQ2588X: Schematic review and layout tips for BQ25882, BQ25883, BQ25886, and BQ25887

    Part Number: BQ25883 The document below contains a checklist of components that are required and recommended for the BQ2588X 2-Cell Boost-Mode Charger family of devices. BQ2588x Schematic Checklist Components are labeled as Required - Critical…

  • [FAQ] LM3881: What is the minimum and maximum capacitance for Cadj for LM3881?

    Part Number: LM3881 The minimum capacitance value for Cadj is 200pF and the maximum is 2uF. For more LM388x FAQ click or type the tag in the search bar [FAQ] LM388x .

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