They are capable of supplying up to 50mA of load current and contain an accurate undervoltage lockout (UVLO) feature to maintain a low quiescent current when the input is below 2.3V. The LTC3388-1 and LTC3388-3 are high efficiency step-down regulators that draw only 720nA (typ) of DC current at no load while maintaining output regulation. The negative voltage rail is connected to the exposed pad of this LTC3388-3 and must be isolated from the system ground plane and have sufficient surface area to provide adequate cooling of the LTC3388-3. The positive voltage rail is created by configuring one LTC3388-3 in its standard buck topology while the negative voltage rail is created with a second LTC3388-3 by grounding the V OUT connection and using the GND pin as the negative voltage rail.
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