XC6603 Series

The XC6603 series is a low voltage input (0.5V) operation and provides high accuracy ±15mV / ±20mV and can supply large current efficiently due to its ultra low on-resistance even at low output voltages.

The series is ideally suited to the applications which require high current in low input/output voltages and consists of a N-ch driver transistor, a voltage reference, an error amplifier, a current limiter, a foldback circuit, a thermal shutdown (TSD) circuit, an under voltage lock out (UVLO) circuit, a soft-start circuit and a phase compensation circuit.

Output voltage is selectable in 0.1V increments within a range of 0.5V to 1.8V using laser trimming technology and ceramic capacitors can be used for the output stabilization capacitor (C_L). The inrush current (I_RUSH) from V_IN toV_OUT for charging C_L at start-up can be reduced and makes theV_IN stable. Soft-start time can be adjustable with connecting a capacitor to the SS pin.

The inrush current conflicts with the soft-start time, therefore if soft-start is set longer, the inrush current is decreased. The CE function enables the output to be turned off and the series to be put in 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 (C_L) to be discharged via the internal switch. As a result the V_OUT pin quickly returns to the V_SS level. The CE pull-down function keeps the IC to be in stand-by mode even if the CE pin is left open.