LP3990-Q1

SNVSA66A – OCTOBER 2014 – REVISED DECEMBER 2015

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7.4 Device Functional Modes

7.4.1 Enable (EN)

The LP3990-Q1 EN pin is internally held low by a 1-M

Ω resistor to GND. The EN pin voltage must be higher than

the VIH threshold to ensure that the device is fully enabled under all operating conditions.

7.4.2 Minimum Operating Input Voltage (VIN)

The LP3990-Q1 does not include any dedicated UVLO circuitry. The LP3990-Q1 internal circuitry is not fully

functional until VIN is at least 2 V. The output voltage is not regulated until VIN ≥ (VOUT + VDO), or 2 V, whichever

is higher.

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