Design Parameters for LT3506

Hi

 I am planning to use either either LT3506 or LT3506A for our application where the input voltage ranges between 4.1V during nights (minimum) and 5.8V during days (maximum). Vout1 = 3.3V and Vout2 = 3.7V. 

I would like to know if I should go with LT3506 or LT3506A. Choosing LT3506 for my use case requires larger inductor compared to LT3506A, but I am skeptical about the range of input voltages supported by LT3506A. 

Can someone help in identifying the right component for my use case? 

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  • 0
    •  Analog Employees 
    on Jun 25, 2021 8:57 AM

    Hello,

    in your scenario I would use a different for two reasons:
    1. We have synchronous (more efficient+space saving) dual buck regulators in our portfolio.

    2. More than that the LT3506 won't work under all conditions, as he needs more Vin to start than to operate (once started): please see following diagram from the datahseet:

    So I recommend to take  one of the following:

    LT8653S, LT8616, LTM4622, LTM8078. These parts do not suffer from the start-up requirement older parts like LT3506 have.

    Al are dual, synchrounos buck regulator . LTM part feature integrated inductors as well.

    br

    Markus

Reply
  • 0
    •  Analog Employees 
    on Jun 25, 2021 8:57 AM

    Hello,

    in your scenario I would use a different for two reasons:
    1. We have synchronous (more efficient+space saving) dual buck regulators in our portfolio.

    2. More than that the LT3506 won't work under all conditions, as he needs more Vin to start than to operate (once started): please see following diagram from the datahseet:

    So I recommend to take  one of the following:

    LT8653S, LT8616, LTM4622, LTM8078. These parts do not suffer from the start-up requirement older parts like LT3506 have.

    Al are dual, synchrounos buck regulator . LTM part feature integrated inductors as well.

    br

    Markus

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