R1210N Series
8V Input PWM Step-up DC/DC Converter
No.EK-067-111001 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 th e xx2 version with an external transistor are available. The oscillator frequenc y 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 100k Hz to 35kHz when output load i s reduced. R1210N also has a functi on that detects drastic changes in
output voltage and reduces the amount of overshoot/undersho ot b y switching contr ol mode.
FEATURES
• Supply Current (IDD1)··············
Typ. 35
μ
A (R1210N301, 100kHz), Typ. 60
μ
A (R1210N301, 180kHz)
(VOUT=SET VOUT × 0.96)
Typ. 20
μ
A (R1210N302, 100kHz), Typ. 25
μ
A (R1210N302, 180kHz)
• Supply Current (IDD2)··············Typ. 10μA (VOUT=SET VOUT+0.5V, 100kHz)
Typ. 15μA (Same as the above, 180kHz)
• Standby Current (Istandby) ········Max. 0.5μA (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 (V
OUT
)
···2.2V to 6.0V (internally fixed) (2.2V to 3.5V for xx1A)
• Output Voltage Accuracy·······± 2.5%
• Oscillator Frequency (fosc)··············
100kHz (xx1A/xx1C/xx2C Version),
180kHz (xx1D/xx2D Version)
•
Basic Frequency Change-over Circuit
···· 100kHz → 35kHz
(only xx1A Version)
•
Oscillator Maxim um Duty Cycle (Maxduty )
····· Typ. 85%
• Efficiency········································
Typ. 88% (R1210N301,
V
IN
=1.8V, I
OUT
=10mA)
• Package········································· SOT-23-5
BLOCK DIAGRAMS
R1210Nxx1x R1210Nxx2x
(Internal output transistor type) (External transistor type)
Chip Enable
V
LX
limiter
PWM Controller
Buffer
OSC
fosc Control
5
2
4
V
OUT
GND
1
CE
L
X
Phase Comp.
Vref
4
2
VOUT
EXT
CE
GND
Buffer
OSC
PWM Controller
Phase Comp.
Chip Enable
-
+
-
+
-
+
1
5
Vref
SELECTION GUIDE TYPICAL APPLICATIONS
Halogen Free
Package
Q'ty per Reel
Part No.
SOT-23-5
3,000 pcs R1210N
.
xx∗$
-TR-FE R1210Nxx1x
SD
V
OUT
CE
L
X
GND
C
L
V
IN
L
LOAD
5
4
2
1
R1210Nxx2x
L
Tr
V
IN
Cb
C
L
Rb
EXT
GND
V
OUT
CE
LOAD
SD
5
4
2
1
.
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.)
L : 100μH, SD : MA721, CL : 22μF×2 L : 27μH, SD : RB491D, Tr : 2SD1628G,
CL : 47μF×2, Rb : 300Ω, Cb : 0.01μF
PACKAGE (Top View) TYPICAL CHARACTERISTICS
SOT-23-5
1 3
5 4
2
1 CE
2 VOUT
3 NC
4 GND
5 LX or EXT
R1210N301C
Efficiency vs. Output Current
80
100
60
40
20
0
L:100μH
Output Current I
OUT
(mA)
V
IN
=2.5V
V
IN
=2.0V
V
IN
=1.5V
V
IN
=0.9V
050 150 250200 300
100
Efficiency
η (%)
R1210N302C
Efficiency vs. Output Current
L:27μH
Output Current I
OUT
(mA)
100
80
60
40
20
0
V
IN
=2.5V
V
IN
=2.0V
V
IN
=1.5V
V
IN
=0.9V
0 200 400 600 800
Efficiency
η (%)
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
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.
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