R1210N Series
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R1210N Series 8V Input PWM Step-up DC/DC Converter The R1210N Series are low supply current, CMOS-based PWM step-up DC/DC converters. By simply using an inductor, a diode, and a capacitor as external components, a high-efficiency step-up DC/DC converter can be easily configured. The xx1 version with an internal output transistor and the xx2 version with an external transistor are available. The oscillator frequency can be selected from 100kHz or 180kHz. The xx1A version is also available, which contains a basic frequency changeover circuit that switches the oscillator frequency from 100kHz to 35kHz when output load is reduced. R1210N also has a function that detects drastic changes in output voltage and reduces the amount of overshoot/undershoot by switching control mode. • Oscillator Frequency (fosc) ············ 100kHz (xx1A/xx1C/xx2C Version), Typ. 20μA (R1210N302, 100kHz), Typ. 25μA (R1210N302, 180kHz) (Switching) Supply Current (IDD2) ··········· Typ. 10μA (No switching, 100kHz) Typ. 15μA (Same as above, 180kHz) Standby Current (Istandby) ······· Max. 0.5μA (CE="L") Input Voltage Range (VIN) ····· Max. 8.0V (Absolute maximum rating : 9.0V) Start-up Voltage (Vstart) ········· Max. 0.9V (xx1 Version), 0.8V(xx2 Version) Output Voltage Range (VOUT) ·· 2.2V to 6.0V (Internally fixed) (2.2V to 3.5V for xx1A) Output Voltage Accuracy ······ ± 2.5% • Basic Frequency Change-over Circuit ···· 100kHz → 35kHz • Oscillator Maximum Duty Cycle (Maxduty) ···· Min. 70%, Typ. 85% • Efficiency·································· Typ. 88% (R1210N301, VIN=1.8V, IOUT=10mA) (Internal output transistor type) (External transistor type) Vref Phase Comp. Chip Enable SELECTION GUIDE Q'ty per Reel Part No. 3,000 pcs R1210N.xx∗$ -TR-FE .xx. : Specify the output voltage within the range of 2.2V (.22.) to 6.0V (.60.) in 0.1V steps. (up to 3.5V (.35.) for xx1A) .∗. : Select from (.1.) internal output transistor type or (.2.) external transistor type. .$. : Select from (.A.) oscillator frequency 100kHz, built-in basic frequency change-over circuit, (.C.) 100kHz or (.D.) 180kHz. (R1210Nxx2A-TR-FE is not available.) R1210N301C Efficiency vs. Output Current R1210N302C Efficiency vs. Output Current TYPICAL CHARACTERISTICS Halogen Free Package SOT-23-5 Phase Comp. Output Current IOUT (mA) 200 400 600 Output Current IOUT (mA) APPLICATIONS • Power source for battery-powered equipment • Power source for hand-held communication equipment, cameras, and VCRs • Power source for equipment that requires the voltage greater than the battery voltage No.EK-067-140930 Step-up DC/DC Converter

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