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Original question:

LM5150-Q1: Boost Operation Not happening with External Load

LM5150-Q1: Vin = 50V (24 Battery Application) Confirmation

Matt Qi
Expert 4510 points
Part Number: LM5150-Q1

Tool/software:

Hi team,

My customer wants to use LM5150-Q1 in the following application:

The purpose of the increase is to cope with the power fluctuations caused by the start and stop of the car, or to maintain the output voltage of the backup battery during the loss of the car battery, requiring:

①AEC-Q100

②standby current  IQ ≤ 15 （如有差异，请备注）

③Adjustable switching ≥ 2 MHz

④Input Voltage Range ：≥50V

⑤Maximum Continuous Output：≥3A

I am confused about the Vin range of LM5150-Q1.

Since the target output from customer is 8.5V, and above 8.5V, they need the system enter the bypass mode (Standby Mode).

And in the standby mode, I think the chip is mainly disabled, but I am not sure whether LM5150-Q1 can suffer under 50V Vin.

Thanks a lot for your support, looking forward to your reply.

Best Regards,

Matt.

  • 0
    TI__Mastermind 19575 points

    Hello Matt,

    As per the datasheet:
    1. Features:
    Wide VIN input range from 1.5 V to 42 V when VOUT ≥ 5 V (65-V absolute maximum)
    7.1 Absolute Maximum Ratings: VIN, VOUT, EN to AGND: 65V
    7.3 Recommended Operating Conditions: VIN, VOUT, EN to AGND: 42V

    This means:
    The process that is being used for this device can sustain voltages up to 65V.
    Above 65V the device will get damaged.

    The recommended maximum voltage is 42V, which means that the device has only been tested up to a supply voltage of 42V
    and the regular long-term supply voltage should remain below that.

    In case of short voltage spikes up to maybe 60V (e.g. because of a load dump) the device will survive.
    But, for the range between 42V and 65V, we do not guarantee any linearity nor a predictable behavior of the device.

    The LM5150 will anyway not be switching in that voltage range, so I would not expect any issue there.

    All information in this correspondence and in any related correspondence is provided “AS IS” and “with all faults” and is subject to TI’s Important Notice: http://www.ti.com/corp/docs/legal/important-notice.shtml


    Best regards
    Harry