Step-down DC/DC Converter Controller With Voltage Detector

Each Step-down DC/DC converter in 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 composed of this IC with only four external components, or a power-transistor, an inductor, a Diode and a capacitor. The output voltage of DC/DC converter CAN be supervised by the built-in voltage detector.
By RICOH Co.,Ltd.
R1221N 's PackagesR1221N 's pdf datasheet

R1221N Pinout, Pinouts
R1221N pinout,Pin out
This is one package pinout of R1221N,If you need more pinouts please download R1221N's pdf datasheet.

R1221N Application circuits
R1221N circuits
This is one application circuit of R1221N,If you need more circuits,please download R1221N's pdf datasheet.

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