XC6221 LDO Voltage Regulators

Torex Semiconductor Ltd.'s XC6221 series is a high accuracy, low noise, high speed, low dropout CMOS regulator with high ripple rejection. This series includes a reference voltage source, an error amplifier, a current limiter, and a phase compensation circuit.

The CE function enables the entire circuit to be in stand-by state by inputting low level signal. As for the XC6221B/D stand-by mode, the electric charge at the output capacitor (C_L) will be discharged by the internal auto-discharge switch, and as a result, the V_OUT pin quickly returns to the VSS level. The output stabilization capacitor (C_L) is also compatible with low ESR ceramic capacitors.

Output voltage is selectable in 0.05 V increments within a range of 0.80 V ~ 4.00 V using the laser trimming technology set in factory.

The current limiter's fold-back circuit also operates as a short circuit protection and an output current limiter at the output pin. The series achieves a fast response with only 25 μA of low power consumption. Additionally, the series has low dropout voltage characteristics, which is 80 mV at I_OUT=100 mA and V_OUT=3.0 V.

With the use of small USP-4 and ultra small USPN-4 packages, a small footprint circuit can be designed.