UCC281DP-5G4 DESCRIPTION
The UCC381-3/-5/-ADJ family of positive linear series pass regulators istailored for low drop out applications where low quiescent power is important. Fabricated with a BiCMOS technology ideally suited for low input tooutput differential applications, the UCC381 will pass 1A while requiringonly 0.5V of input voltage headroom. Dropout voltage decreases linearlywith output current, so that dropout at 200mA is less than 100mV. Quiescent current is always less than 650μA. To prevent reverse current conduction, on-chip circuitry limits the minimum forward voltage to typically 50mV.Once the forward voltage limit is reached, the input-output differential volt-age is maintained as the input voltage drops until undervoltage lockout disables the regulator.
UCC281DP-5G4 FEATURES
?Precision Positive Linear VoltageRegulation
?0.5V Dropout at 1A
?Guaranteed Reverse Input/ OutputVoltage Isolation with Low Leakage
?Low Quiescent Current Irrespective ofLoad
?Adjustable Output Voltage Version
?Fixed Versions for 3.3V and 5VOutputs
?Logic Shutdown Capability
?Short Circuit Power Limit of3%
?VIN
?Current Limit
?Remote Load Voltage for AccurateLoad Regulation
UCC281DP-5G4 Applications
? UPSsystems
? Highpowerconverters
? Motordrives
? Windturbines
