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The MCP1727 is a 1.5A Low Dropout (LDO) linearregulator that provides high current and low outputvoltages in a very small package. The MCP1727comes in a fixed (or adjustable) output voltage version,with an output voltage range of 0.8V to 5.0V. The 1.5Aoutput current capability, combined with the low outputvoltage capability, make the MCP1727 a good choicefor new sub-1.8V output voltage LDO applicaTIons thathave high current demands.The MCP1727 is stable using ceramic outputcapacitors that inherently provide lower output noiseand reduce the size and cost of the enTIre regulatorsoluTIon. Only 1 μF of output capacitance is needed tostabilize the LDO.Using CMOS construcTIon, the quiescent currentconsumed by the MCP1727 is typically less than120 μA over the entire input voltage range, making itattractive for portable computing applications thatdemand high output current. When shut down, thequiescent current is reduced to less than 0.1 μA.The scaled-down output voltage is internally monitoredand a power good (PWRGD) output is provided whenthe output is within 92% of regulation (typical). Anexternal capacitor can be used on the CDELAY pin toadjust the delay from 200 μs to 300 ms.The overtemperature and short circuit current-limitingprovide additional protection for the LDO during systemfault conditions.
