About LT1461DHS8 Maximum Output Current

Hi, 

I would like to use LT1461DHS8.

So, I have a question.

Please help me.

Question:

Looking at the datasheet, we can see that the LT1461 has a model number depending on the temperature grade.
This time, I want to support -40 ℃ to 125℃, and am considering LT1461DHS8.

The output current is planned to be 50mA as a specification,
Is output possible as an IC?

Looking at the datasheet,
"Load Regulation Sourcing" states that only LT1461DHS8 is "0≤Iout≤10mA".

"Dropout Voltage" has "I and C Grades Only" at Iout = 50mA.

In H Grades, can the output current be used only up to 10mA?

Best Regards,

Naohisa

  • 0
    •  Analog Employees 
    on Mar 25, 2020 7:37 AM 8 months ago

    Hi Naohisa,

    The 10mA is not necessarily the maximum current that the H Grade part can source. This is only the current range where the H Grade Load Regulation specified in the table will hold true for the whole temperature range (-40 to 125degC). This relationship can be seen at Load Regulation and Dropout Voltage graph in Page 5 & 6.

    Do you have any other specific on your application? Like what voltage output do you need or maybe what specs is important in your application? We also has the LT6658 which specs-wise is better than the LT1461.

    Regards,

    Mon

  • Hi mon23,

    Thank you for your reply.

    I have confirmed your answer.
    For example, when using H grade at room temperature (25degC), is it correct that it can be used at 50mA like I and C?
    (Limited to 10mA in a high-temperature range such as 85 to 125degC)

    Also, please tell us about "Line Regulation" and "Load Regulation Sourcing".

    Only the H grade is a separate frame. Why is the characteristic worse?

    I usually thought that the quality would go up and the characteristics would be better(example:I grade→H grade).

    Also, about H grade,
    Please tell us about "CONDITIONS" when measuring characteristics.

    Best Regards,

    Naohisa

  • 0
    •  Analog Employees 
    on Apr 13, 2020 6:09 AM 7 months ago in reply to naohisa

    Hi Naohisa,

    Yes, the H grade part at 25degC can be used at 50mA like I and C.

    The part has two different type of grading, Accuracy and Temperature.

    The Accuracy grade is the grade that designates the initial accuracy and temperature coefficient of the part.

    The temperature grade is as it's name implies, the temperature range at which the part is specs or can normally work.

    So the C, I  and H are temperature grade, and H being for -40 to 125degC 

    I usually thought that the quality would go up and the characteristics would be better(example:I grade→H grade).

    Yes this is true in "legacy" ADI parts. But for this part going up the alphabet, in the case of Accuracy Grade, means having worse specs than the previous letter grade. But in the case of Temperature Grade, it is much wider temperature ranges.

    "The ο denotes the specifications which apply over the specified temperature range, otherwise specifications are at TA = 25°C. VIN – VOUT = 0.5V, Pin 3 = 2.4V, CL = 2µF, unless otherwise specified."

    The above note under the ELECTRICAL CHARACTERISTICS title will apply to all parameter test. So all the parameters with RED DOT will apply to the whole temp range. For example in Load and Line Regulation specs, the H temp grade is separated in the table which means that if the application will be working with -40 to 125 temp range, the specs will hold true for the whole temp range. 

    Regards,

    Mon