The R1223N Series are PWM step-down DC/DC Converter controllers with low supply current by CMOS process. Each of these ICs consists of an oscillator, a PWM control circuit, a reference voltage unit, an error amplifier,   a soft-start circuit, a protection circuit, a PWM/VFM alternative circuit, a chip enable circuit, and resistors for   voltage detection. A low ripple, high efficiency step-down DC/DC converter can be easily composed of this IC   with only four external components, or a power-transistor, an inductor, a diode and a capacitor.

FEATURES
Range of Input Voltage  · · · · · · · · · · · · ·2.3V~13.2V
Built-in Soft-start Function and Two choices of Protection Function (Latch-type or Reset type)
Two choices of Oscillator Frequency · · · · · ·300kHz, 500kHz
High Efficiency  · · · · · · · · · · · · · · · · · ·TYP. 90%
Output Voltage  · · · · · · · · · · · · · · · · ·Stepwise Setting with a step of 0.1V in the range of 1.5V ~5.0V
Standby Current  · · · · · · · · · · · · · · · · ·TYP. 0µA
High Accuracy Output Voltage · · · · · · · · · ·±2.0%
Low Temperature-Drift Coefficient of Output Voltage · · · · ·TYP. ±100ppm/°C