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LMR23625CFPEVM: LMR23625CFDDA

Abhijit Pethkar41
Intellectual 280 points
Part Number: LMR23625CFPEVM
Other Parts Discussed in Thread: LMR23625

I am using LMR23625CFDDA switcher regulator in my design. It is used for converting 15V to 5V. It is provided with a resistor divider at the EN/SYNC pin with Pulled high resistor value of 8.87 KOhms and pulled low resistor value of 1.05 KOhms. This results in 1.5V to 1.6V at the EN/SYNC pin (As per datasheet the EN/SYNC voltage should be between 1.4V to 1.7V).

The input voltage of 15V has a tolerance of 5% which makes the input voltage swing anywhere between 14.25V to 15.75V. During testing I found out that if the voltage is between 14.25V and 14.8V then the output is not constant or sometimes absent even though the operating voltage is given as 4V to 36V in the datasheet.

I would like to know why the regulator is not giving output even if the voltage input and voltage for the EN/SYNC is between values given in the datasheet.

  • 0
    TI__Mastermind 27045 points

    Hi

    At Vin>3.9V, LMR23625 will be enabled if EN pin voltage is higher than 1.7V,  data sheet spec of 1.4V--1.7V is the voltage range to enable device, you should program the resistor divider to make sure EN pin voltage>1.7V at possible lowest Vin voltage.

    B R

    Andy