XC6421 Series

300mA Small High Speed Dual LDO Regulator, Built-in Inrush Current Protection

The XC6421 series is an ultra small CMOS dual LDO regulator, mounting 300mA 2-channel small high speed LDO. The series features high accuracy, high ripple rejection and low dropout voltage. The series is capable of high density board installation by the ultra small package of two low on-resistance regulators. Both output accuracies are ±1.0% by laser trimming. Each regulator can be turned off independently to be in stand-by mode by controlling EN pin. In this state, the electric charge at the output capacitor (CL) is discharged via the internal auto-discharge switch, and as a result the VOUT voltage quickly returns to the VSS level. The output stabilization capacitor (CL) is also compatible with low ESR ceramic capacitors.

The high level of output stability is maintained even during frequent load fluctuations, due to the excellent transient response performance.

Over current protection circuit and over heat protection circuit are mounted, these circuits start working when output current reaches junction temperature or limit current. The two regulators are completely isolated so that a cross talk during load fluctuations is minimized.

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Nov 24, 2011
Product News
300mA Small High-speed Dual LDO Regulator, Built-in Inrush Current Protection XC6421 Series

Typical Application Circuit


MaximumOutput Current 300mA
Input Voltage Range 1.6V~5.5V
Output Voltage Range 1.2V~3.6V (0.05V increments)
High Accuracy ±1%(VOUT≧2.00V),±20mV(VOUT≦1.95V)
Dropout Voltage 210mV@IOUT=300mA(VOUT=3.0V)
Low Quiescent Current 90μA/ch(TYP.)
Stand-by Current Less than 0.1μA
High Ripple Rejection: 75dB@1kHz
ON/OFF Control Active High ,CLDischarge
Protection Circuits Current Limit 450mA(TYP.)
Short Circuit 125mA(TYP.)
Inrush Current Protection
Thermal Shutdown
Low ESR Capacitor Ceramic Capacitor Compatible 1.0μF
Operating Ambient Temperature -40℃~+85℃
Environmentally Friendly EU RoHS compliant, Pb free



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.