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R1210Nxx1x Series


PWM Step-up DC/DC Converter




| * Outline | * Features | * Applications | * Documenets Download |



Outline


The R1210Nxx1x Series are CMOS-based PWM step-up DC/DC Converter, with high accuracy, low supply current.

Each of the R1210Nxx1x 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. R1210Nxx1A 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 components, 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 response is improved compared with current model, furthermore the R1210Nxx1A 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.

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Features


*External Components Only an inductor, a diode, and a capacitor
*Standby Current MAX. 0.5μA
*Low Temperature-Drift Coefficient
of Output Voltage
TYP. ±100ppm/°C
*Output Voltage Stepwise Setting with a step 0.1V in the range of 2.2V to 6.0V(xx1C/D, xx2C/D) 2.2V to 3.5V(xx1A)
*Two choices of Basic Oscillator Frequency 100kHz(xx1A/C), 180kHz(xx1D)
*Output Voltage Accuracy ±2.5%
*Small Package SOT-23-5 (Mini-mold)
*High Efficiency TYP. 88%(VIN: Set Output Voltage x 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 xx1A type) from TYP. 100kHz to 35kHz
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Applications

Power source for battery-powered equipment.
Power source for portable communication appliances, cameras, VCRs.
Power source for appliances which require higher voltage than battery voltage.
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Documents Download


Data Sheet
(PDF)
Package Info.
(PDF)
Mark Info.
(PDF)
Quality Assurance Data
(PDF)
*R1210Nxx1x Series
NO. EA-075-071207(203KB)
SOT-23-5 R1210N *Reliability

* All PDF files are less than 1MB unless otherwise stated.
* If you don't have Adobe Reader, you can download free.
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Technical Info.

* Application Note

Application Note

Technical Information on Ricoh Power Management ICs.
*

Quick Links

* Quality Assurance System
(PDF:175KB)
* Inductor Information
(PDF:70KB)


Product Catalog

Selection Guide
Selection guide is available for download in PDF format.



Non-promotion / Discontinued Products

* Power Management ICs
* Real-time clock ICs


Lead (Pb) Free Information

All of the Lead-free products comply with RoHS Directive. RoHS Compliant


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