Description
The CS5231-3 combines a threeterminal linear regulator with circuitry to control an external PFET transistor with the intent of managing two input supplies. A 5V supply powers the regulator while an auxiliary 3.3V supply is controlled by the IC. The design has been optimized to provide a “glitch-free” transition between the two supplies.

FEATUREs
Linear Regulator
■ 3.3V ± 2% Output Voltage
■ 3mA Quiescent Current @ 500mA
■ Fast Transient Response
■ Current Limit
■ Thermal Shutdown with Hysteresis
■ 450µA Reverse Output Current
■ Fast Transient Response

System Power Management
■ Auxiliary Supply Control