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. FEATURES * Supply Current (IDD1)************** Typ. 35A (R1210N301, 100kHz), Typ. 60A (R1210N301, 180kHz) * * * * * * * Oscillator Frequency (fosc) ************** 100kHz (xx1A/xx1C/xx2C Version), Typ. 20A (R1210N302, 100kHz), Typ. 25A (R1210N302, 180kHz) (VOUT=SET VOUT x 0.96) Supply Current (IDD2)************** Typ. 10A (VOUT=SET VOUT+0.5V, 100kHz) Typ. 15A (Same as the above, 180kHz) Standby Current (Istandby) ******** Max. 0.5A (In standby) Input Voltage Range (VIN) ****** Max. 8.0V 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% 180kHz (xx1D/xx2D Version) * Basic Frequency Change-over Circuit **** 100kHz 35kHz (only xx1A Version) * Oscillator Maximum Duty Cycle (Maxduty)***** Typ. 85% * Efficiency**************************************** Typ. 88% (R1210N301, VIN=1.8V, IOUT=10mA) * Package ***************************************** SOT-23-5 BLOCK DIAGRAMS R1210Nxx1x R1210Nxx2x (Internal output transistor type) (External transistor type) Vref Vref VLX limiter 2 VOUT Phase Comp. EXT 5 Phase Comp. Buffer fosc Control + Chip Enable 4 GND Chip Enable 1 1 CE CE SELECTION GUIDE TYPICAL APPLICATIONS R1210Nxx1x Halogen Free Package Q'ty per Reel Part No. SOT-23-5 3,000 pcs R1210N.xx$ -TR-FE 5 4 R1210Nxx2x SD SD Cb .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-F is not available.) SOT-23-5 L VOUT 2 5 LX 4 GND CE 1 CL VIN L : 100H, SD : MA721, CL : 22Fx2 LOAD L R1210N301C Efficiency vs. Output Current EXT VOUT 2 4 GND CE 1 CL L : 27H, SD : RB491D, Tr : 2SD1628G, CL : 47Fx2, Rb : 300, Cb : 0.01F L:100H R1210N302C Efficiency vs. Output Current 80 60 40 VIN=2.5V VIN=2.0V VIN=1.5V VIN=0.9V 20 0 L:27H 100 Efficiency (%) CE VOUT NC GND LX or EXT Efficiency (%) 1 2 3 4 5 3 5 Rb VIN 80 2 Tr TYPICAL CHARACTERISTICS 100 1 GND + OSC PACKAGE (Top View) 4 + OSC PWM Controller VOUT - PWM Controller Buffer 2 LOAD LX 5 0 50 100 150 200 250 Output Current IOUT (mA) 60 40 VIN=2.5V VIN=2.0V VIN=1.5V VIN=0.9V 20 300 0 0 200 400 600 Output Current IOUT (mA) 800 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-067-111001 Step-up DC/DC Converter 1. 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