CMPWR330

• Continuous 3.3V output from three inputs
• Complete power management solution
• VCC, VSBY regulator supplies 400mA output
• Built-in hysteresis when selecting input supplies
• Integrated switch has very low RDS(ON) resistance of 0.25Ω (TYP)
• Foldback current limiting protection
• Thermal overload shutdown protection
• 8-pin power SOIC package
• RoHS compliant (lead-free) finishing

The CMPWR330 is a dual input regulator with a fully integrated VAUX switch capable of delivering up to 400mA continuously at 3.3V. The input is taken from three independent voltage sources on a prioritized basis. Power is always taken in priority using the order of VCC, VSBY, and VAUX.

When VCC (5V) or VSBY is present, CMPWR330 automatically enables the regulator and produces a stable 3.3V output at VOUT.

When only VAUX (3.3V) is present, CMPWR330 provides a low impedance direct connection (0.25 TYP.) from VAUX to VOUT.

All the necessary control circuitry needed to provide a smooth and automatic transition between all three supplies has been incorporated. CMPWR330 allows the VCC input supply to be dynamically switched without loss of output voltage.

The CMPWR330 is housed in an 8-pin SOIC package and is available with RoHS compliant lead-free finishing.