CMOS LDO Regulators Reject Ripple

Based on CMOS technology, the S-1172 Series LDO, positive-voltage regulators specify a high ripple rejection, typically 70 dB at 1 kHz with an output voltage of 1V. Reportedly, the devices provide very small dropout voltages and a large output current due to a built-in transistor with low on resistance. Available in HSOP-6 and SOT-89-5 packages, other features include adjustable output voltages from 1V to 5V, selectable in 0.05V steps, an input voltage from 1.5V to 5.5V, output voltage accuracy of ±1%, a low dropout voltage of 70 mV typical, operating current of 70 µA typical and 90 µA maximum, shutdown current of 0.1 µA typical and 1 µA maximum, and an output current of 1A at 3V out. SEIKO INSTRUMENTS USA INC., Torrance, CA. (310) 517-7700.