Operating from a minimum input voltage of 1.65V, the LP3991regulator has been designed to provide fixed stable outputvoltages for load currents up to 300mA. This device is suitablewhere accurate, low voltages are required from low input voltagesources and is therefore suitable for post regulation ofswitched mode regulators. In such applications, significantimprovements in performance and EMI can be realized, withlittle reduction in overall efficiency. The LP3991 will providefixed outputs as low as 1.2V from a wide input range of 1.65Vto 4.0V Using the enable pin, the device may be controlled toprovide a shutdown state, in which negligible supply currentis drawn.
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