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LM3553: Flash LED

GARETH OU
Guru 10135 points
Part Number: LM3553
Other Parts Discussed in Thread: LM3644

Hi

I would like to ask you to recommend an IC with or without the same function

A. It needs to be a flash (I want to drive two leds, one needs 1A)

B. Also test Torch (the same two, but I think about one with 60 ~ 100m A is fine).

C. In addition, because it needs to be used with CAMERA ISP 2688, I want to jumper the cable to try the function of switching between FLASH and TORCH.

  • 0
    TI__Genius 9630 points

    hello Gareth

    LM3644 is one possible solution with 1.5A flash current and 360mA torch current. But the switching between FLASH and TORCH needs to be realized by re-configuring the internal register.

  • 0 in reply to Mason Wang
    Guru 10135 points

    Hi Masson

    1. Thank you for recommending 3644 , so what is the reason why 3553 is not suitable?

    2. It is mentioned below that 3644 depends on the register for mode switching, how to use it?

  • 0 in reply to GARETH OU
    TI__Genius 9630 points

    hi Gareth

    I would like to confirm the current rating again with you. The requirement is 2 LEDs with 1A each? and 2 LEDs will operate at the same time?

    Actually LM3644 has higher current capability than 3553 and lower Iq which means smaller power loss. Besides, LM3644 also has smaller package.

    there is a register for LM3644 to switch the mode.