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. 35μA (R1210N301, 100kHz), Typ. 60μA (R1210N301, 180kHz) |
• Oscillator Frequency (fosc) ·············· 100kHz (xx1A/xx1C/xx2C Version), |
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(VOUT=SET VOUT × 0.96) |
Typ. 20μA (R1210N302, 100kHz), Typ. 25μA (R1210N302, 180kHz) |
180kHz (xx1D/xx2D Version) |
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• Supply Current (IDD2)·············· Typ. |
10μA (VOUT=SET VOUT+0.5V, 100kHz) |
• Basic Frequency Change-over Circuit ···· 100kHz → 35kHz |
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Typ. |
15μA (Same as the above, 180kHz) |
(only xx1A Version) |
• Standby Current (Istandby) ········ Max. 0.5μA (In standby) |
• Oscillator Maximum Duty Cycle (Maxduty)····· Typ. 85% |
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• Input Voltage Range (VIN)······ Max. 8.0V |
• Efficiency········································ Typ. 88% (R1210N301, |
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• Start-up Voltage (Vstart)··········· Max. 0.9V (xx1 Version), 0.8V(xx2 Version) |
VIN=1.8V, IOUT=10mA) |
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• Output Voltage Range (VOUT)··· 2.2V to 6.0V (internally fixed) (2.2V to 3.5V for xx1A) |
• Package ········································· SOT-23-5 |
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• Output Voltage Accuracy ······· ± 2.5% |
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BLOCK DIAGRAMS
R1210Nxx1x |
R1210Nxx2x |
(Internal output transistor type) |
(External transistor type) |
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Vref |
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Phase Comp. |
2 |
VOUT |
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LX |
5 |
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EXT |
5 |
Buffer |
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VLX limiter |
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Buffer |
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PWM Controller |
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PWM Controller |
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OSC |
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OSC |
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fosc Control |
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4 |
GND |
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Chip Enable |
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Chip Enable |
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1 |
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1 |
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CE |
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CE |
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Vref |
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Phase Comp. |
2 |
VOUT |
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- |
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+ |
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- |
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+ |
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+ |
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4 |
GND |
SELECTION GUIDE
Halogen Free Package Q'ty per Reel |
Part No. |
SOT-23-5 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-F is not available.)
TYPICAL APPLICATIONS
R1210Nxx1x |
R1210Nxx2x |
SD |
SD |
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Cb |
L |
L |
5 |
LX |
VOUT |
2 |
CL |
LOAD |
Tr |
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5 EXT VOUT 2 |
LOAD |
VIN |
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Rb |
CL |
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VIN |
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4 GND CE 1 |
4 GND CE 1 |
L : 100μH, SD : MA721, CL : 22μF×2 |
L : 27μH, SD : RB491D, Tr : 2SD1628G, |
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CL : 47μF×2, Rb : 300Ω, Cb : 0.01μF |
PACKAGE (Top View)
SOT-23-5
5 4
1 2 3
1CE
2VOUT
3NC
4GND
5LX or EXT
TYPICAL CHARACTERISTICS
R1210N301C |
R1210N302C |
Efficiency vs. Output Current |
Efficiency vs. Output Current |
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100 |
L:100μH |
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100 |
L:27μH |
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80 |
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80 |
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η (%) |
60 |
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η (%) |
60 |
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Efficiency |
40 |
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Efficiency |
40 |
VIN=2.5V |
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VIN=2.5V |
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VIN=2.0V |
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VIN=2.0V |
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20 |
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20 |
VIN=1.5V |
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VIN=1.5V |
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VIN=0.9V |
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VIN=0.9V |
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0 |
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0 |
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0 |
50 |
100 |
150 |
200 |
250 |
300 |
0 |
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400 |
600 |
800 |
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Output Current IOUT (mA) |
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Output Current IOUT (mA) |
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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 |
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