Linear Regulators (LDO) | MC33565

The MC33565 Low Drop Out Voltage Regulator is designed for computer peripheral card applications, allowing glitch-free transitions from "sleep" to "active" system modes. It has internal logic circuitry to detect whether there is a 5 V supply ("active" system mode) or an auxiliary 3.3 V supply ("sleep" system mode). A guaranteed 3.3 V regulated output voltage at 200 mA is always available even if the main 5 V supply drops out.

The regulated 3.3 V output voltage is provided by either an internal dropout 5.0 V-to-3.3 V voltage regulator or an external P-channel MOSFET, depending on the system being in the "active" or "sleep" mode.