The MIC23060 from Micrel is a power management IC that integrates a DC/DC converter and a post-regulating, low voltage capable LDO. The high 4 MHz operating frequency allows the use of small external components and reduces output ripple. The device provides every potential combination of turn-on and turn-off sequencing of the two outputs by connecting two pins either high or low and by using a single GPIO to enable and disable the DC/DC and LDO outputs. The LDO is designed to power directly from the battery and/or post-regulate from the output of the DC/DC converter for high system efficiency. In applications where the LDO is enabled prior to the DC/DC, the LDO is first powered by the system input voltage (typically a battery source). Once the DC/DC is enabled, the input to the LDO seamlessly transitions to the post-regulated output of the DC/DC converter.
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