DESCRIPTION
A 1.25 volt reference allows lower output voltages required by today’s portable microprocessors. The gate drive circuitry can deliver 2.0A peak currents, allowing the use of N-channel MOSFETs for lower switching and conduction losses. A digital soft start is provided to ensure orderly start up of the power supply without the need for external components. At light load in power save mode, the controller changes mode of operation by missing gate drive cycles, thus reducing gate drive current and improving efficiency. A logic high on PSAVE disables the power saving mode thus reducing noise. The SC1401 is fabricated in a high performance BiCMOS process. This process reduces the power dissipation in low current and shutdown operation modes and improves efficiency. The LDO controller is a high performance positive voltage regulator designed to provide a low noise power source to the microprocessor peripherals by driving a low cost external N-Channel MOSFET. VIN C1 C2 C3 C4 C5 FEA...
Semtech Corporation
