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LMZ31710: Vout Issue

Part Number: LMZ31710

Hi. 

My customer want Vin 5V -> Vout 1V. So they using LMZ31710.

But Vout is abnormal.

1. When OCP_SEL = Flaoting,  RT_CLK = 1MOhm, No output voltage.

2. When OCP_SEL = GND,  RT_CLK = 1MOhm, Vout is about 0.8V.

3.  When OCP_SEL = GND, RT_CLK=100KOhm, Vout is 1V.

As datasheet, When 1V Vout, R_RT is 1MOhm is recommended.

And OCP_SEL is not related with Vout.

Why this issue occur? Please let me know.

Schematic is same Webench schematic.

  • From you description of your application and the attached schematic, I do not see any issue.
    Can you send some waveforms of the input voltage and output voltage in these different conditions? Also, can you send you internal schematic which shows all of the pin connections? You can send directly to me at jarrigo@ti.com. Thanks, Jason