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Question Regarding LTC7899 Charge Pump Output Voltage

Thread Summary

The user inquired about the adjustability of the charge pump output voltage in the LTC7899 via the DRVSET pin. The final answer clarifies that the charge pump voltage is not adjustable and its primary function is to source current to the BOOST pin to charge the BOOST capacitor, not to regulate voltage. The charge pump is crucial for maintaining the FET drive voltage at high duty cycles (near 100%). Accompanying answers provided an LTspice simulation example showing the charge pump's behavior under different DRVSET settings.
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Category: Datasheet/Specs
Product Number: LTC7899

Regarding the LTC7899, the DRVCC voltage is adjustable via the DRVSET pin.

Is the charge pump output voltage also adjustable according to the DRVSET setting, or is it fixed at a certain voltage?

I also ran an LTspice simulation under a 100% duty-cycle condition (Vin > Vout).

However, it appears that the charge pump function is not currently implemented in the LTspice model.

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