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LM5146: LM5146 vs LM5145. Error in datasheet or not?

Denis Zaikin
Prodigy 10 points
Part Number: LM5146
Other Parts Discussed in Thread: LM5145, LM25145

LM5146

Recommended Operating Conditions VIN: 5.5 - 100 V

Absolute Maximum Ratings VIN: -0.3 - 100 V

LM5145

Recommended Operating Conditions VIN: 6 - 75 V

Absolute Maximum Ratings VIN: -0.3 - 105 V

The maximum VIN value of the LM5146 is lower than the LM5145, Realy?

What is the real maximum value for LM5146 if this is an error?

  • 0
    TI__Guru 74052 points

    Hi Denis,

    The LM5146/-Q1 was specified slightly more conservatively than the LM5145/-Q1. Of course, it's the recommended operating range that is important, and the LM5146 goes to 100V. We now have a consolidated quickstart calculator for the LM5145/6 and LM25145 family -- please use this to assist with component selection.

    Regards,

    Tim

  • 0 in reply to Timothy Hegarty
    Prodigy 10 points

    Hi Timothy,

    the maximum is equal to the recommended one, this is very strange.

    I need a controller for a converter with an input range of 16-96 Volts. Load 12V@3A. Minimum load current is 0,1 A. LM5146 seems like a good choice.

  • 0 in reply to Denis Zaikin
    TI__Guru 74052 points

    Hi Dennis,

    Yes, the LM5146 is a good option here. You can use the LM5146 quicstart calculator to assist with component selection: https://www.ti.com/tool/LM5146DESIGN-CALC

    Also, use the LM5146 EVM design as guidance for a PCB layout design that minimizes switch-voltage overshoot/ringing, especially given that Vin-max of 96V for the application is close to the max rating of the controller. See this app note for more detail on optimized power stage layout www.ti.com/lit/SNVA803 (in particular, input capacitor placement).

    Regards,

    Tim