IR3847 regulator equivalent, synchronous buck regulator.
* Single 5V to 21V application
* Wide Input Voltage Range from 1.5V to 21V with external Vcc
* Output Voltage Range: 0.6V to 0.86*PVin
* 0.5% accurate Ref.
and sequencing
* Vref is available externally to enable margining
* External synchronization with Smooth Clockin.
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