XC6601 Series

400mA Low Voltage Input LDO Voltage Regulators with Soft-start Function

The XC6601 series is a CMOS LDO voltage regulator with precise (±20mV) outputs which enables the operation in ultra low On resistance even where low output voltages to achieve high efficiency of the output current. The series is suited for the application which requires low dropout voltage operation. The series consists of a voltage reference, an error amplifier, a driver transistor, a current limiter, a fold back circuit, a thermal shutdown (TSD) circuit, a Under Voltage Lock Out (UVLO) and a phase compensation circuit.

The output voltage is selectable in 0.05V increments within the range of 0.7V to 1.8V using laser trimming technologies. The output stabilization capacitor (CL) is also compatible with low ESR ceramic capacitors.

The over current protection circuit (the current limiter and the fold back circuit) and the thermal shutdown circuit (the TSD circuit) are built-in. These two protection circuits will operate when the output current reaches limit level or the junction temperature reaches temperature limit level.

With the built-in UVLO function, the regulator output is forced OFF when the VBIAS pin or the VIN pin becomes the UVLO voltage or lower.

The CE function enables the output to be turned off and the series becomes a stand-by mode resulting in greatly reduced power consumption. At the time of entering the stand-by mode, the series enables the electric charge at the output capacitor (CL) to be discharged via the internal auto-discharge switch placed between the VOUT pin and the VSS pin, as a result the VOUT pin quickly returns to the VSS level.

Typical Application Circuit


MaximumOutput Current More than 400mA, 550mA limit(TYP.)
Dropout Voltage 38mV@IOUT=100mA(TYP.),(VBIAS-VOUT(E)=2.4V)
Bias Voltage Range 2.5V~6.0V,VBIAS-VOUT(E)≧1.2V
Input Voltage Range 1.0V~3.0V(VIN≦VBIAS)
Output Voltage Range 0.7V~1.8V(0.05V increments)
High Accuracy ±20mV
Quiescent Current IBIAS=25μA,IIN=1.0μA(TYP.)
Stand-by Current IBIAS=0.01μA,IIN=0.01μA(TYP)
TSD Detect:150℃,Release:125℃(TYP.)
Soft-Start Time 240μs@VOUT=1.2V(TYP.)
Operating Ambient Temperature -40℃~85℃
Functions CL High Speed Auto Discharge
Low ESR Capacitor Low ESR Ceramic



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.