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recommend led driver for 1cell LiPo and IR-LEDs

Stefan Krueger
Intellectual 670 points
Other Parts Discussed in Thread: LM3410Hello TI-Community,

please can you give me some hints on a recommend boost or buck-boost chip for following requirements:
#1
Input: 1cell LiPo (3.0V - 4.2V)
Output 50..100mA (to be resistor adjustable during development) @ 1.5V - 8.5V (1 to 5 IR-LEDs)

if this is a to broad range of values
#2
Input: 1cell LiPo (3.0V - 4.2V)
Output 50..100mA (to be resistor adjustable during development) @ 6V - 8.5V ( == 4 to 5 IR-LEDs (Vf 1.5V-1.7V) )

and
#3
Input: 1cell LiPo (3.0V - 4.2V)
Output 50..100mA (to be resistor adjustable during development) @ 1.5V - 1.7V ( == 1 IR-LED (Vf 1.5V-1.7V) )

focus is on simple design (not on cost)
(and i will have to pair this with some LiPo charger and auto-power-off on battery empty...)

thanks for your support!

sunny greetings
stefan
  • 0
    TI__Mastermind 25500 points

    Hello Stefan,

    Do you have any particular dimming requirements such as analog or PWM dimming? In any case my best recommendation for this voltage range would be the LM3410. For case #2 a boost would be sufficient, for cases numbers 1 and 3 you could run it in SEPIC (buck-boost) configuration. There are examples of both in the datasheet but feel free to let us know if you need any help.

    Regards,

    Clint

  • 0
    TI__Mastermind 25500 points
    By the way, IR LEDs are interesting. Is there any information about the application you could share? If not I understand. Thanks.
  • 0 in reply to Clinton Jensen
    Intellectual 670 points
    Hi Clint,
    thanks for your recommendation - i will try this chip.
    requarding the application i can give you an idea what we want to do:
    It will be an mobile IR-Tag for computerVision systems. it is powered by a single LiPo cell (currently we favor 18650Cell type) and will have IR-LEDs that will be diffused in some way.. (to be defined- mutlipel ideas exists..).
    with this the IR-enabled USB-Webcams can see the tag and you can 'freely' move the tags around in the room.
    its for some experiments with computer vision.. (nothing 'fancy' i just want to tryout some of the things i found...)
    eventually this could get included in some art thing... mostly collecting ideas and prove of concept for implementation possibilities..

    sunny greetings
    stefan