The MIC39100, MIC39101, and MIC39102 are 1A low dropout linear voltage regulators that provide low voltage, high current output from an extremely small package. The MIC39100/1/2 offers extremely low dropout (typically 410 mV at 1A) and low ground current (typically 11 mA at 1A). The MIC39100 is a fixed output regulator offered in the SOT-223 package. The MIC39101 and MIC39102 are fixed and adjustable regulators, respectively, in a thermally enhanced 8-lead SOIC package. The MIC39100/1/2 is ideal for PC add-in cards that need to convert from standard 5V to 3.3V, 3.3V to 2.5V, or 2.5V to 1.8V. A guaranteed maximum dropout voltage of 630 mV over all operating conditions allows the MIC39100/1/2 to provide 2.5V from a supply as low as 3.13V and 1.8V from a supply as low as 2.43V. The MIC39100/1/2 is fully protected with overcurrent limiting, thermal-shutdown, and reverse-battery protection. Fixed voltages of 5.0V, 3.3V, 2.5V, and 1.8V are available on MIC39100/1 with adjustable output voltages to 1.24V on MIC39102.