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looking for replacment for LT3080

Shai Berman
Mastermind 7400 points
Other Parts Discussed in Thread: TPS7A47, LM1086, LM350A

Hello team,

my customer is using LT3080 as a current source (up to 1A), do we have any suitable replacement for this part?

can you please advise back, thanks in advance.

Regards,

Shai  

  • 0
    TI__Genius 14317 points

    Hello Shai,

    Our Cross Reference search here  http://www.ti.com/sitesearch/docs/crossreferencesearch.tsp indicates that the TPS7A47 is a suitable replacement. Please take a look at the data sheet here http://www.ti.com/product/TPS7A47?keyMatch=lt3080&tisearch=Search-EN-CrossRef If that device does not meet your needs, just post a reply with details. 

  • 0 in reply to Jeffery Pfarr
    Mastermind 7400 points
    Hi Jeff,

    this device is not suited due to the need for controlling the current has a source,
    I understand the TPS is not supporting current source (only voltage source).
    Does TI have any other current source device which supports the minimum of 1A and not needs to be controlled by external MCU (hence not I2C)?
    can you please suggest another device? thanks.

    Regards,
    Shai
  • 0 in reply to Shai Berman
    TI__Genius 10460 points

    Hi Shai,

    The LM150/LM350A/LM350 and LM1086 are some of TI's wide input linear regulators than can be used as constant current regulators without an external MCU. See the figure below for an example circuit. The output current is calculated as follows:

    Iout = Vref / R1 = 1.25 V / R1

    As such, the current regulator shown below can be configured for 1 A by replacing R1 with a 1.2 Ohm, 2 W resistor. 

    Keep in mind that these devices will need more headroom (VIN - VOUT) to regulate properly compared to the LT3080. The LM150 dropout voltage is about 1.8 V (typical) at 1 A, and the LM1086 dropout voltage is about 1.1 V (typical) at 1 A. 

    Thanks,

    Gerard