need 40-50ma buffer driver iCs idea


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  1. #1
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    Default need 40-50ma buffer driver iCs idea

    Hi all,

    i just need to know if someone here know some quad, octal or hex Buffer/Driver ICs that can drive AND sink at least 40-50ma at 5Volt(don't need to be a very high speed, maximum switching will be it's < 100KHZ). For the prototype i place a pair of digital transistors with built-in resistor but if i can place a ic instead it will save some space/parts on the boards.

    thanks!
    Last edited by mister_e; - 12th April 2005 at 23:30.
    Steve

    It's not a bug, it's a random feature.
    There's no problem, only learning opportunities.

  2. #2
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    ULN2003, ULN2004, ULN2803, ULN2804 to name but four... and they're rated to 500mA per channel.

  3. #3
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    Hi Steve,

    I just want to confirm what Mel has already said.

    I have used hundreds of ULN2803, they are relatively inexpensive and they are bulletproof.
    regards

    Ralph

    _______________________________________________
    There are only 10 types of people:
    Those who understand binary, and those who don't ...
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  4. #4
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    yeah i already use those ULN but thanks. I was talking about something like 4051 but with a 40 mA and up DRIVE AND SINK at the same time capability on the same chip. BTW i'll stick with the digital transistor configuration.

    some H-Bridge or combination of two ULN will also do the job but when you compare the pricing of transistors and those, you can save a few $

    Well sometimes we can't find everything in a single chip

    Thanks again folks for your time.
    Steve

    It's not a bug, it's a random feature.
    There's no problem, only learning opportunities.

  5. #5
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    Hi!

    4469 Line Driver - capable of driving highly capacitive,
    inductive, or resistive loads with the ability to
    source or sink up to 100ma current per output.

    The line drivers are commonly used for encoder outputs.
    The text below is from a manufacturer of encoders.

    Luciano

    * * *

    5. Output IC’s
    Output IC’s are available in either Line Driver (LD) or Open
    Collector (OC) types. Open Collectors require pull-up resistors and
    so have higher output impedance. In general it is recommended
    to use a Line Driver style of output. They can either source or sink
    current and their lower impedance mean better noise immunity
    and faster switching times. Our applications specialists would be
    pleased to discuss your system requirements and the compatibility
    of your receiving electronics with Line Driver type outputs.


    7272
    Multi-voltage Line Driver: 100 mA source/sink. Input voltage 5 to
    28 VDC standard (Note: Vout = Vin). Available with
    voltage regulator for 5 to 28 VDC input/TTL output (called out as
    a special feature). This driver is TTL compatible when used with 5
    volt supply or with a voltage regulator option. Supply lines are
    protected against overvoltage to 60 volts and reverse voltage.
    Outputs are short circuit protected for one minute. Supply current
    is 120 mA typical (plus load current). This is the recommended
    replacement for 3904R and 7406R open collector outouts with
    internal pullup resistors. This is also a direct replacement for any
    4469, 88C30, 8830 or 26LS31 line driver


    4469
    Multi-voltage Line Driver: 100 mA source/sink. Input voltage 5
    to 15 VDC standard (Note: Vout = Vin ). Available with voltage
    regulator for 5 to 24 VDC input/5V output (called out as a special
    feature). TTL compatible when used with 5 volt supply or with
    voltage regulator. Supply lines are protected against overvoltage
    to 60 volts and reverse voltage. Outputs are short circuit protected
    for one minute. Supply current is 90 mA typical (plus load current).
    This is the replacement for 3904R and 7406R outputs for systems
    operating at 15 volts and below. This is also a direct replacement
    for any 88C30, 8830, or 26LS31 Line Driver.
    replaced by the 4469 or the 7272 in system upgrades, or with
    the 7273 if external pull-ups are used.

  6. #6
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    Really interesting, thanks Luciano!
    Steve

    It's not a bug, it's a random feature.
    There's no problem, only learning opportunities.

  7. #7
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    Smile

    Also Available from microchip, the XX - 4426, 4427, 4428, widely spread twin Mosfet drivers, ref depends on inverting or not.
    They also permi level shifting ...

    Alain

  8. #8
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    Try the STmicro L293D. It will drive up to 600 mA in an H bridge fashion. It is simple and rugged. It also has built in diodes for inductive loads. Available @ Digi, or Mouser. The only down side is that it's current draw is on the high side. I use them by the fist full for robotics.

    Ron

  9. #9
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    Thanks Acetronics and Ron. In the meantime i also found TC1426 and TC1427 from Microchip.
    Steve

    It's not a bug, it's a random feature.
    There's no problem, only learning opportunities.

  10. #10
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    Quote Originally Posted by mister_e
    I was talking about something like 4051 but...
    Doh.. i meant 4050.
    Steve

    It's not a bug, it's a random feature.
    There's no problem, only learning opportunities.

  11. #11
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    Hi!

    Also available from Micrel Inc.
    http://www.micrel.com

    MIC4126/4127/4128
    http://www.micrel.com/product-info/p...4126-7-8.shtml

    MIC4126/4127/4128 Datasheet:
    http://www.micrel.com/_PDF/MIC4126-7-8.pdf

    MIC4467/4468/4469
    http://www.micrel.com/product-info/p.../mic4467.shtml

    MIC4467/4468/4469 Datasheet:
    http://www.micrel.com/_PDF/mic4467.pdf

    Application Note 24
    Designing with Low-Side MOSFET Drivers
    http://www.micrel.com/_PDF/App-Notes/an-24.pdf

    * * *

    TelCom Semiconductor
    Microchip Acquires TelCom Semiconductor
    http://www.microcontroller.com/micro...mcp_telcom.htm

    TC1426 are from TelCom Semiconductor now Microchip.

    * * *

    regards,

    Luciano

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