PWM/VFM Step-down DC/DC Converter

The R1225N Series are CMOS-based PWM Step-down DC/DC Converter controllers with low supply current.Each of these ICs consists of an Oscillator a PWM control circuit, a reference voltage unit, an error Amplifier a soft-start circuit, a latch-type protection circuit, a PWM/VFM alternative circuit, a chip enable circuit, a phase compensation circuit, and an input voltage detect circuit. Further, protection circuit delay time adjuster circuit, and resistors for voltage detection are included. A low ripple, high efficiency Step-down DC/DC converter CAN be easily composed of this IC with some external components, or a power-transistor, an inductor, a Diode and capacitors. With a PWM/VFM alternative circuit, when the load current is small, the operation is automatically switching into the VFM Oscillator from PWM Oscillator therefore the efficiency at small load current is improved. The R1225NXXXC/D/K types, which are without a PWM/VFM alternative circuit, are also available.
By RICOH Co.,Ltd.
R1225N 's PackagesR1225N 's pdf datasheet

R1225N Pinout, Pinouts
R1225N pinout,Pin out
This is one package pinout of R1225N,If you need more pinouts please download R1225N's pdf datasheet.

R1225N Application circuits
R1225N circuits
This is one application circuit of R1225N,If you need more circuits,please download R1225N's pdf datasheet.

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