CMPWR280
Dual Input SmartORt Power Switch
Product Description The ON Semiconductor’s SmartORt CMPWR280 is a fully
protec...
CMPWR280
Dual Input SmartORt Power Switch
Product Description The ON Semiconductor’s SmartORt CMPWR280 is a fully
protected Dual−Input low−dropout CMOS
regulator that also provides the necessary control signal for driving an external auxiliary P−channel MOSFET switch. The SmartORt device automatically selects one of three possible inputs on a priority basis: VCC (1.5 A), VSBY (375 mA) or VAUX via the drive signal used to control an external switch.
VCC is given first priority. In the event of the VCC supply being powered down, the device will automatically deselect the VCC prior to
regulator dropout and immediately select VSBY (second priority) as its power source.
If neither VCC nor VSBY are present the drive control output will turn−on an external P−channel MOSFET switch from an auxiliary 3.3 V supply VAUX to VOUT.
All the necessary control circuitry needed to provide a smooth and automatic transition between all three supplies has been incorporated. This allows VCC to be dynamically switched without loss of output voltage.
The CMPWR280 is internally protected against output short−circuits, current overload and thermal overload.
The CMPWR280 is housed in a standard, 5−lead TO−263 package and is available with optional lead−free finishing.
Features
Selects from 3 Input Voltages and Provides 3.3 V Output Automatic Selection of VCC, VSBY or VAUX Drive Control Signal for External VAUX Switch Glitch−Free 3.3 V Output During Supply Transitions Built−In Hysteresis for Su...