• RE: LT3081 Output voltage using a DAC

    Thanks for the post.  You can drive SET on the LT3081 with a DAC, but keep in mind that the LT3081 and similar LDOs require that OUT and SET are always close to the same voltage.  That requirement is not well covered in the datasheets other than the +/…

  • Simulation of LT3081

    Hello,

    I did some simulation of the low dropout regulator LT3081 about the current limit. But no matter how I adjust the values and settings, the simulation values are always greater than the theoretical values.

    Please give me some suggestion.

    Thanks…

  • RE: LT3081 Overload Recovery - Applies to Many LT308X LDOs

    This is how I answer the question posted above:

    There is a text section in the LT3085 datasheet called Overload Recovery that is probably applicable to your scenario with the LT3081.  The image below shows the text section from the LT3085 datasheet:

     

    …

  • RE: LT1963A IN Pin Voltage range

    LT1963A absolute maximum input voltage is only ±20V. (-20V is only for reverse voltage protection)

    Which means having a 24V input is NOT recommended.

    If you want to create a design with a 24V input, you can check the part below (LT3081: Vin=±40V…

  • RE: LT3089 LTSpice Model

    Can you use the LT3081 model for now?  I apologize that the LT3089 model is not yet released.  The week of January 6 I will try my best to make sure the LT3089 is in the queue and give you an update of the release timing if it is possible for me to get…

  • Best way to provide a minimum load.

    Some linear regulators, such as the LT3081, require a minimum load current for regulation (5mA worst-case for the LT3081).  Since it can be adjusted to 0V, using a  resistor for this purpose can require a low resistance resistor which can dissipate significant…

  • ARAD Supported Parts as of 2020 January 8_0

    LT1074
    LT1076
    LT1076-5
    LT1082
    LT1083
    LT1083-Fixed
    LT1084
    LT1084-Fixed
    LT1085
    LT1085-Fixed
    LT1086
    LT1087
    LT1173
    LT1268
    LT1269
    LT1270
    LT1271
    LT1432
    LT1432-3.3
    LT1500
    LT1501
    LT1572
    LT1932
    LT1937
    LT3003
    LT3015
    LT3030
    LT3061
    LT3062
    LT3063
    LT3080
    LT3080-1
    LT3081
    LT3082
    LT3083
    LT3085
    LT3086
    LT…

  • RE: LT3092: Problem with supporting BJT for higher current

    Thanks for the post.  I don't have time to test your circuit using hardware at the moment, but I will mention that the LT3092 and other similar LDOs will act strangely if SET is driven too far away from OUT.  See the link below to a post that discusses…

  • LT3080 Exposed Pad Is Soldered to Ground by Mistake

    I get this question frequently so I will post the question and then answer myself:

    "I made a mistake and did not notice that the LT3080 datasheet says for the DD PACKAGE that "EXPOSED PAD (PIN 9) IS OUT, MUST BE SOLDERED TO PCB".  I made…

  • 使用LT3083设计恒流源时，电流不稳定问题

    各位大佬好：

            小弟最近在使用LT3083设计一个功率较大（1A级别）的线性LED驱动器，方法是使用DAC输出参考电压Vref，连接到LT3083的Vset引脚，但是在测试时发现LT3083，当LT3083输出电流略大时(30mA)，电流就十分不稳定。

    测试条件简述如下：

    1. 供电电源使用DC/DC 或者LDO时，二者测试效果无差别，电流波动大；

    2. 负载使用水泥电阻 或 LED  时，二者测试效果无差别，电流波动大；

    3. 参考电压Vref来源 ： 使用DAC8563 或者NI 采集卡USB6009…