OUTLINE The R1221N Series are PWM step-down DC/DC Converter controllers embedded with a voltage detector, with low supply current by CMOS process. 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. With a PWM/VFM alternative circuit, when the load current is small, the operation turns into the VFM oscillator from PWM oscillator automatically, therefore the efficiency at small load current is improved. FEATURES ● Wide Range of Input Voltage · · · · · · · · · · · · · 2.3V to 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% ● Standby Current · · · · · · · · · · · · · · · · · · · · · TYP. 0µA ● Setting Output Voltage · · · · · · · · · · · · · · · · · Stepwise setting with a step of 0.1V in the range of 1.5V to 5.0V ● High Accuracy Output Voltage · · · · · · · · · · · · · · ±2.0% ● Setting Detector Threshold Voltage · · · · · · · · · · · Stepwise setting with a step of 0.1V in the range of 1.2V to 4.5V ● High Accuracy Detector Threshold Voltage· · · · · · · ±2.0% ● Low Temperature-Drift Coefficient of Output Voltage · TYP. ±100ppm/°C APPLICATIONS ● Power source for hand-held communication equipment, cameras, video instruments such as VCRs, camcorders. ● Power source for battery-powered equipment. ● Power source for household electrical appliances.
|