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 (I
DD1
)·············· Typ. 35μA (R1210N301, 100kHz), Typ. 60μA (R1210N301, 180kHz)
•
Supply Current (I
DD2
)·············· Typ. 10μA (V
OUT
=SET V
OUT
+0.5V, 100kHz)
•
•
•
•
•
(V
OUT
=SET V
OUT
×
0.96)
Typ. 20μA (R1210N302, 100kHz), Typ. 25μA (R1210N302, 180kHz)
Typ. 15μA (Same as the above, 180kHz)
Standby Current (I
standby
) ········ Max. 0.5μA (In standby)
Input Voltage Range (V
IN
) ······ Max. 8.0V
Start-up Voltage (V
start
)··········· 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 (f
osc
) ·············· 100kHz (xx1A/xx1C/xx2C Version),
•
Basic Frequency Change-over Circuit ···· 100kHz
→
35kHz
•
•
•
180kHz (xx1D/xx2D Version)
(only xx1A Version)
Oscillator Maximum Duty Cycle (Maxduty)····· Typ. 85%
Efficiency········································ Typ. 88% (R1210N301,
V
IN
=1.8V, I
OUT
=10mA)
Package ········································· SOT-23-5
BLOCK DIAGRAMS
R1210Nxx1x
(Internal output transistor type)
Vref
L
X
5
V
LX
limiter
Buffer
PWM Controller
OSC
fosc Control
4 GND
Chip Enable
1
CE
Chip Enable
R1210Nxx2x
(External transistor type)
Vref
Phase Comp.
2 V
OUT
EXT
5
Buffer
PWM Controller
OSC
Phase Comp.
-
+
-
+
-
+
2
V
OUT
4
GND
1
CE
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
SD
Cb
R1210Nxx2x
SD
L
LOAD
5
L
Rb
4
V
IN
4
GND CE
1
V
IN
GND CE
1
L : 100μH, SD : MA721, C
L
: 22μF×2
L : 27μH, SD : RB491D, Tr : 2SD1628G,
C
L
: 47μF×2, Rb : 300Ω, Cb : 0.01μF
PACKAGE (Top View)
SOT-23-5
5
4
TYPICAL CHARACTERISTICS
R1210N301C
Efficiency vs. Output Current
100
80
Efficiency
η
(%)
R1210N302C
Efficiency vs. Output Current
100
80
Efficiency
η
(%)
L:100μH
L:27μH
1
2
3
60
40
20
0
60
40
20
0
V
IN
=2.5V
V
IN
=2.0V
V
IN
=1.5V
V
IN
=0.9V
0
200
400
600
Output Current I
OUT
(mA)
800
1
2
3
4
5
CE
V
OUT
NC
GND
L
X
or EXT
V
IN
=2.5V
V
IN
=2.0V
V
IN
=1.5V
V
IN
=0.9V
0
50
100
150
200
250
300
Output Current I
OUT
(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-067-111001
Step-up DC/DC Converter
LOAD
L
X
V
OUT
2
C
L
Tr
5
EXT V
OUT
2
C
L
1. The products and the product specifications described in this document are subject to change or
discontinuation of production without notice for reasons such as improvement. Therefore, before
deciding to use the products, please refer to Ricoh sales representatives for the latest
information thereon.
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without prior written consent of Ricoh.
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exporting or otherwise taking out of your country the products or the technical information
described herein.
4. The technical information described in this document shows typical characteristics of and
example application circuits for the products. The release of such information is not to be
construed as a warranty of or a grant of license under Ricoh's or any third party's intellectual
property rights or any other rights.
5. The products listed in this document are intended and designed for use as general electronic
components in standard applications (office equipment, telecommunication equipment,
measuring instruments, consumer electronic products, amusement equipment etc.). Those
customers intending to use a product in an application requiring extreme quality and reliability,
for example, in a highly specific application where the failure or misoperation of the product
could result in human injury or death (aircraft, spacevehicle, nuclear reactor control system,
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devices, life support system etc.) should first contact us.
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semiconductor products are likely to fail with certain probability. In order to prevent any injury to
persons or damages to property resulting from such failure, customers should be careful enough
to incorporate safety measures in their design, such as redundancy feature, firecontainment
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damage arising from misuse or inappropriate use of the products.
7. Anti-radiation design is not implemented in the products described in this document.
8. Please contact Ricoh sales representatives should you have any questions or comments
concerning the products or the technical information.
RICOH COMPANY., LTD.
Electronic Devices Company
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