XC6503 Series

CL Capacitor-less 500mA Low Quiescent Current High Speed LDO Regulator

The XC6503 series is a 500mA high speed CMOS LDO regulator that can provide stable output voltages even without a load capacitor CL. The devices are available in fixed output voltage from 1.2V to 5.0V in 0.05V increments,The CL capacitor-less is possible because phase compensation is carried out internally unlike other LDOs where it is done externally. It results in saving board design space. The current limit fold-back circuit and thermal shutdown circuit work as protection circuit. The XC6503P is a 3-Terminal regulator and the XC6503D has a chip enable function, which enables the entire circuit to be turned off by a low level input signal to the CE pin.

When a CL capacitor is used, the IC can discharge the electric charge stored at the output capacitor through the internal switch while in standby state, and as a result the VOUT quickly returns to the VSS level.

Typical Application Circuit


MaximumOutput Current 500mA
Input Voltage Range 1.7V~6.0V
Output Voltage Range 1.2V~5.0V(0.05V increments)
Output VoltageAccuracy ±1.0%(2.0V~5.0V),±20mV(1.2V~1.95V)
Output Voltage Temp. Characteristics ±30ppm/℃
Dropout Voltage 190mV@VOUT=2.8V,IOUT=300mA
Low Quiescent Current 15μA(TYP.),0.1μA(stby)
High Ripple Rejection: 55dB@1kHz,VOUT=2.8V
Protection Circuits Current Limit(630mA,TYP.),Short Circuit Protection,Thermal Shut Down
Output capacitor is not required Internal phase compensation
Operating Ambient Temperature -40℃~+85℃
Environmentally Friendly EU RoHS compliant, Pb free



Technical Document

Quality Reports


QuestionWhat is the standby current?

The current that flows through the IC in the standby mode. The standby mode means the state where the IC has been turned off by the CE function.