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R1210N Series0 pages
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),
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%
180kHz (xx1D/xx2D Version)
• Basic Frequency Change-over Circuit ···· 100kHz → 35kHz
(only xx1A Version)
• Oscillator Maximum Duty Cycle (Maxduty) ···· Min. 70%, 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
4
+
OSC
fosc Control
+
Chip Enable
4 GND
Chip Enable
1
1
CE
CE
SELECTION GUIDE
TYPICAL APPLICATIONS
R1210Nxx1x
Q'ty per Reel
Part No.
3,000 pcs R1210N.xx∗$ -TR-FE
SOT-23-5
5
4
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-FE is not available.)
PACKAGE (Top View)
R1210Nxx2x
SD
L
L
VOUT 2
5
LX
4
GND CE 1
VIN
L : 100μH, SD : MA721, CL : 22μF×2
R1210N301C
Efficiency vs. Output Current
GND CE 1
CL
L : 27μH, SD : RB491D, Tr : 2SD1628G,
CL : 47μF×2, Rb : 300Ω, Cb : 0.01μF
L:100μH
R1210N302C
Efficiency vs. Output Current
80
60
40
VIN=2.5V
VIN=2.0V
VIN=1.5V
VIN=0.9V
20
0
L:27μH
100
Efficiency η (%)
CE
VOUT
NC
GND
LX or EXT
Efficiency η (%)
1
2
3
4
5
3
EXT VOUT 2
VIN
80
2
5
Rb
TYPICAL CHARACTERISTICS
100
1
Tr
4
CL
LOAD
Halogen Free Package
SOT-23-5
GND
+
OSC
PWM Controller
VOUT
-
PWM Controller
Buffer
2
Phase Comp.
Buffer
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-067-140930
Step-up DC/DC Converter
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