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R1210N221A Datasheet(PDF) 2 Page - RICOH electronics devices division |
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R1210N221A Datasheet(HTML) 2 Page - RICOH electronics devices division |
2 / 18 page PWM Step-up DC/DC Converter R1210N××1× Series 1 OUTLINE The R1210N××1× Series are PWM step-up DC/DC Converter, with high accuracy, low supply current by CMOS process. Each of the R1210N××1× Series consists of an oscillator, a PWM circuit, a reference voltage unit, an error amplifier, phase compensation circuit, resistors for voltage detection, a chip enable circuit. Further, includes a controller against drastic load transient, a control transistor with low ON-Resistance, ‘LX switch’, and a protection circuit for LX switch and an output voltage detector. R1210N××1A Series contain further a circuit for changeover oscillator frequency each. A low ripple, high efficiency step-up DC/DC converter can be composed of this IC with only three external compo- nents, or an inductor, a diode and a capacitor. The R1210N Series can detect drastic change of output voltage with a circuit controller. The load transient re- sponse is improved compared with current model, furthermore the R1210N××1A Series have another function, that is, when the load current is small, oscillator frequency is decreased by a circuit for switching oscillator frequency from TYP. 100kHz to 35kHz, therefore, supply current is reduced. The built-in chip enable circuit can make the standby mode with ultra low quiescent current. Since the package for these ICs is small SOT-23-5, high density mounting of the ICs on board is possible. FEATURES • External Components ................................................................. Only an inductor, a diode, and a capacitor • Standby Current ......................................................................... TYP. 0µA • Low Temperature-Drift Coefficient of Output Voltage.............. TYP. ±100ppm/°C • Output Voltage............................................................................. Stepwise Setting with a step of 0.1V in the range of 2.2V to 6.0V (××1C/D) 2.2V to 3.5V (××1A) • Two choices of Basic Oscillator Frequency................................ 100kHz (××1A/C), 180kHz (××1D) • Small Package.............................................................................. SOT-23-5 (Mini-mold) • High Efficiency ............................................................................ TYP. 88% (VIN=Set Output Voltage×0.6 [V], IOUT=10mA) • Low Ripple, Low Noise • Built-in a driver transistor with low on-resistance • Start-up Voltage........................................................................... MAX. 0.9V • Basic Frequency change-over circuit (only for ××1A type)....... from TYP. 100kHz to 35kHz |
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