The R5321D Series are CMOS-based 2 channels voltage regulator ICs with high output voltage accuracy, extremely low supply current, low noise, low ON-resistance and high ripple rejection. The R5321D Series contain two voltage regulators. Each of these voltage regulators in the R5321D Series consists of a voltage reference unit, an error amplifier, resistors for setting output voltage, a current limit circuit and a chip enable circuit.