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Description
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.
Specifications and 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/°CApplication Scenarios
● 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.Comparison
Advantages- Low supply current by CMOS process
Disadvantages- Requires an external power-transistor, inductor, diode, and capacitor for step-down DC/DC converter composition
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Similar parts: 430483 , Click to view
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Datasheet
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Shopping guide
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Popular parts of the same kind
- Datasheet: Download 24AH
- Chipdatas Part: CD94-24AH
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- Last Updated: 2024/06/03 11:16 +0800
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