LP3990

SNVS251J – MAY 2004 – REVISED SEPTEMBER 2014

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7.4 Device Functional Modes

7.4.1 Enable (EN)

The LP3990 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 does not include any dedicated UVLO circuitry. The LP3990 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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