MAX889RESA+: FAQ

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When using the MAX889R, the input voltage is 5V and the required output voltage is -4.9V, but I can only obtain -4.7V. What is the reason for that? And how do I solve it?

Due to the voltage drop in the internal MOSFET of the MAX889, the absolute value of the output voltage is 0.2V to 0.4V less than the input voltage. This is a normal situation. Please increase the input…

When using the MAX889R, the input voltage is 5V and the required output voltage is -4.9V, but I can only obtain -4.7V. What is the reason for that? And how do I solve it?