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  • LMR62421: Problems with the PWM signal of the LMR62421

    Part Number: LMR62421 Hi everyone, I have a circuit that uses a LMR62421 as power supply, I show you the design: VBAT1 is the voltage of a battery and 7V should appear on the output, but VIN appears on VOUT, it is as if the circuit did not work, I replaced…
    • Answered

  • RE: LMR62421: Boost Converter to drive Motor Inrush Current Properly

    Resolved
    Hi Brian, The "stage 2", or "phase 2", is not a classical concept defined in books. I just used it based on the motor behavior from rest to stable status of fast spin, and the current waveforms you provided. I don't think the Cout…

  • RE: LMR62421: How to get 2.1 amp maximum output current of the IC

    Hi Zuhaib, The max output will be larger than 5A. Here is the calculate method for your reference. Will you consider TPS61033? It should be a better choice. Regards Lei
    • Answered

  • LMR62421: seeing voltage on the output when EN is low

    Resolved
    Part Number: LMR62421 Other Parts Discussed in Thread: LM2735 Hi, I am seeing 3.3V on the output of the LMR62421 with the enable is low. The voltage seems to be a diode drop value of the input voltage so I am not sure what is going on. I have attached…
    • Resolved

  • LMR62421: Not boosting

    Part Number: LMR62421 Other Parts Discussed in Thread: LMR64010 , I am using LMR62421XMF/NO regulator to boost from Li ion battery 3.7 V to 12V . I had checked the switching output but no pulsing i can see . Also i am cascading two boost regulator . In…

  • LMR62421: LMR62421 3V/5V input with 5V/1A output

    TI Thinks Resolved
    Part Number: LMR62421 Other Parts Discussed in Thread: TPS61023 Hi : I want to drive a 2*2W DAC by single cell Li-on Battery. In my design, I will turn off battery when voltage less than 3V, meanwhile with USB plug in, I want to use 5V instead of battery…

  • RE: LMR62421: Not working without a series resistor at pin 4, (Enable pin)!

    Hello Eric, Thank you for your answer. For some how when I do not have place the EN pin resistor, the regulator LMR62421 gets damage. I verified that it is not related to the resistor . I have short circuited the resistor and there was no difference in…
    • Answered

  • LMR62421: Low-Pass Output Filter Problem

    Resolved
    Part Number: LMR62421 Hi, I have the following design using the LMR62421 to boost a 4.5V input to a 12V output, with a nominal load of ~100mA, and a damped LC low-pass filter on the output: As-is, the output only approaches 12V measuring an open circuit…
    • Resolved

  • LMR62421: LMR62421 IC

    TI Thinks Resolved
    Part Number: LMR62421 Hello Zack, We have done with LMR62421 placements. Please check the placements of a LMR62421 IC Placement.. Please tell, this placement is correct?

  • LMR62421: LMR62421 not functioning for 7.5v @300mA (3.3V battery input)

    TI Thinks Resolved
    Part Number: LMR62421 We used LMR62421 SOT package to drive 4 LED with Vf 6v @ 50mA. Somehow, LMR output voltage drops to 6.4v. LMR is configured for 7.5v output. Is there any limitations. we used 10uF output cap. we also tried 22uF and 470uF output cap…

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