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NO. EA-075-0012
PWM Step-up DC/DC Converter
R1210N1 Series
APPLICATION MANUAL
PWM Step-up DC/DC Converter
R1210N1 Series
1
OUTLINE
The R1210N1 Series are PWM step-up DC/DC Converter, with high accuracy, low supply current by CMOS
process.
Each of the R1210N1 Series consists of an oscillator, a PWM circuit, a reference voltage unit, an error amplifier,
phase compensation circuit, resistors for voltage detection, a chip enable circuit. Further, includes a controller against
drastic load transient, a control transistor with low ON-Resistance, `L
X
switch', and a protection circuit for L
X
switch
and an output voltage detector. R1210N1A Series contain further a circuit for changeover oscillator frequency each.
A low ripple, high efficiency step-up DC/DC converter can be composed of this IC with only three external compo-
nents, or an inductor, a diode and a capacitor.
The R1210N Series can detect drastic change of output voltage with a circuit controller. The load transient re-
sponse is improved compared with current model, furthermore the R1210N1A Series have another function, that is,
when the load current is small, oscillator frequency is decreased by a circuit for switching oscillator frequency from
TYP. 100kHz to 35kHz, therefore, supply current is reduced.
The built-in chip enable circuit can make the standby mode with ultra low quiescent current.
Since the package for these ICs is small SOT-23-5, high density mounting of the ICs on board is possible.
FEATURES
External Components ................................................................. Only an inductor, a diode, and a capacitor
Standby Current ......................................................................... TYP. 0A
Low Temperature-Drift Coefficient of Output Voltage.............. TYP. 100ppm/C
Output Voltage............................................................................. Stepwise Setting with a step of 0.1V in the range of
2.2V to 6.0V (1C/D)
2.2V to 3.5V (1A)
Two choices of Basic Oscillator Frequency................................ 100kHz (1A/C), 180kHz (1D)
Small Package.............................................................................. SOT-23-5 (Mini-mold)
High Efficiency ............................................................................ TYP. 88%
(V
IN
=Set Output Voltage0.6 [V], I
OUT
=10mA)
Low Ripple, Low Noise
Built-in a driver transistor with low on-resistance
Start-up Voltage........................................................................... MAX. 0.9V
Basic Frequency change-over circuit (only for 1A type)....... from TYP. 100kHz to 35kHz
R1210N1
2
APPLICATIONS
Power source for battery-powered equipment.
Power source for portable communication appliances, cameras, VCRs
Power source for appliances of which require higher voltage than battery voltage.
BLOCK DIAGRAM
Chip Enable
V
LX
limiter
Phase Comp.
PWM Controller
Buffer
OSC
fosc Control
Vref Circuit
5
2
4
V
OUT
GND
1
CE
L
X
SELECTION GUIDE
In the R1210N Series, the output voltage, the oscillator frequency, the optional function, and the taping type for the
ICs can be selected at the user's request.
The selection can be made by designating the part number as shown below ;
R1210N1-
a b c
Code
Contents
a
Setting Output Voltage (V
OUT
) :
Stepwise setting with a step of 0.1V in the range of 2.2V to 6.0V (for 1C/D version) or
2.2V to 3.5V (for 1A version) is possible.
b
Designation of Oscillator Frequency
A : 100kHz with a Frequency Change-over circuit
C : 100kHz without a Frequency Change-over circuit
D : 180kHz without a Frequency Change-over circuit
c
Designation of Taping Type; Ex. :TR, TL (refer to Taping Specification)
"TR" is prescribed as a standard.
R1210N1
3
PIN CONFIGURATION
SOT-23-5
5
4
L
X
GND
(mark side)
1
2
3
CE
V
OUT
NC
PIN DESCRIPTION
Pin No.
Symbol
Description
1
CE
Chip Enable Pin
2
V
OUT
Pin for Monitoring Output Voltage
3
NC
No Connection
4
GND
Ground Pin
5
L
X
Switching Pin (Nch Open Drain)
ABSOLUTE MAXIMUM RATINGS
Symbol
Item
Rating
Unit
V
OUT
V
OUT
Pin Output Voltage
9.0
V
V
LX
L
X
Pin Output Voltage
9.0
V
V
CE
CE Pin Input Voltage
9.0
V
I
LX
L
X
Pin Output Current
400
mA
P
D
Power Dissipation
250
mW
Topt
Operating Temperature Range
-40+85
C
Tstg
Storage Temperature Range
-55+125
C
R1210N1
4
ELECTRICAL CHARACTERISTICS
R1210N
1
(Topt=25C)
Symbol
Item
Conditions
MIN.
TYP.
MAX.
Unit
V
OUT
Output Voltage
V
IN
=V
SET
0.6, I
OUT
=1mA
0.975
1.025
V
V
IN
Maximum Input Voltage
8
V
V
OUT
/
Topt
Step-up Output Voltage
Temperature Coefficient
-40C Topt 85C
100
ppm/C
Vstart
Start-up Voltage
V
IN
=0V2V
V
OUT
:1.8k pull-down
0.9
V
Vstart/
Topt
Start-up Voltage
Temperature Coefficient
-40C Topt 85C
-3.2
mV/C
0.7
V
(1A/C)
Vhold
Hold-on Voltage
V
IN
=2V0V, I
OUT
=1mA
0.9
V (1D)
30
55
A
(1A/C)
2.2VV
SET
2.5V
V
OUT
=V
SET
0.96
50
80
A
(1D)
35
60
A
(1A/C)
2.6VV
SET
3.0V
V
OUT
=V
SET
0.96
60
90
A
(1D)
40
70
A
(1A/C)
3.1VV
SET
3.5V
V
OUT
=V
SET
0.96
70
100
A
(1D)
45
80
A
(1C)
3.6VV
SET
4.0V
V
OUT
=V
SET
0.96
80
110
A
(1D)
50
90
A
(1C)
I
DD1
Supply Current1
4.1VV
SET
4.5V
V
OUT
=V
SET
0.96
90
120
A
(1D)
R1210N1
5
Symbol
Item
Conditions
MIN.
TYP.
MAX.
Unit
70
100
A
(1C)
4.6VV
SET
5.0V
V
OUT
=V
SET
0.96
100
130
A
(1D)
80
110
A
(1C)
5.1VV
SET
5.5V
V
OUT
=V
SET
0.96
110
150
A
(1D)
90
120
A
(1C)
I
DD1
Supply Current1
5.6VV
SET
6.0V
V
OUT
=V
SET
0.96
130
170
A
(1D)
10
17
A
(1A/C)
I
DD2
Supply Current2
V
OUT
=V
CE
=V
SET
+0.5V
15
24
A
(1D)
Istandby
Standby Current
V
OUT
=6V, V
CE
=0V
0.5
A
I
LXleak
L
X
Leakage Current
V
OUT
=V
LX
=8V
0.5
A
80
100
120
KHz
(1A/C)
fosc
Maximum Oscillator
Frequency
V
OUT
=V
CE
=V
SET
0.96
144
180
216
KHz
(1D)
0.5
kHz/C
(1A/C)
fosc/
Topt
Oscillator Frequency
Temperature Coefficient
-40C Topt 85C
0.6
kHz/C
(1D)
Maxdty
Oscillator Maximum Duty
Cycle
V
OUT
=V
CE
=V
SET
0.96,
(V
LX
"L" Side)
70
85
97
%
V
LXlim
V
LX
Limit Voltage
V
OUT
=V
CE
=V
SET
0.96,
(V
LX
"L" Side)
0.4
0.6
0.8
V
V
CEH
CE "H" Input Voltage
V
OUT
=V
SET
0.96
0.9
V
V
CEL
CE "L" Input Voltage
V
OUT
=V
SET
0.96
0.3
V
I
CEH
CE "H" Input Current
V
OUT
=V
CE
=6.5V
-0.1
0
0.1
A
I
CEL
CE "L" Input Current
V
IN
=6.5V, V
CE
=0V
-0.1
0
0.1
A
R1210N1
6
Symbol
Item
Conditions
MIN.
TYP.
MAX.
Unit
2.2VV
SET
2.4V
V
LX
=0.4V
70
mA
2.5VV
SET
2.9V
V
LX
=0.4V
85
mA
3.0VV
SET
3.4V
V
LX
=0.4V
100
mA
3.5VV
SET
3.9V
V
LX
=0.4V
120
mA
4.0VV
SET
4.4V
V
LX
=0.4V
140
mA
4.5VV
SET
4.9V
V
LX
=0.4V
150
mA
5.0VV
SET
5.4V
V
LX
=0.4V
170
mA
I
LX
L
X
Switching Current
5.5VV
SET
6.0V
V
LX
=0.4V
190
mA
fosc2
Change-over frequency
V
IN
=V
SET
0.6, I
OUT
=0.5mA
(only for 1A)
10
35
70
KHz
*Note: V
SET
means setting Output Voltage.
R1210N1
7
TEST CIRCUITS
A
SD
V
OUT
CE
L
X
GND
C
L
V
IN
L
V
E
V
OUT
CE
L
X
GND
C
L
OSCILLOSCOPE
B
V
OUT
CE
L
X
GND
A
F
V
OUT
CE
L
X
GND
C
L
OSCILLOSCOPE
C
V
OUT
CE
L
X
GND
A
G
V
OUT
CE
L
X
GND
OSCILLOSCOPE
D
V
OUT
CE
L
X
GND
A
H
V
OUT
CE
L
X
GND
A
L: 100H CD54 (Sumida Electric Co, LTD)
SD: MA721 (Matsushita Electronics Corporation, Schottky Type)
CL: 22F2 (Tantalum Type)
R1210N1
8
TYPICAL CHARACTERISTICS
1)
Output Voltage vs. Output Current
R1210N301C
R1210N301D
3.1
3.2
3.0
2.9
2.8
Output Current I
OUT
(mA)
0
50
V
IN
:0.9V
V
IN
:1.5V
V
IN
:2.0V
V
IN
:2.5V
150
250
200
300
100
Output
V
oltage
V
OUT
(V)
3.1
3.2
3.0
2.9
2.8
Output Current I
OUT
(mA)
0
50
V
IN
:0.9V
V
IN
:1.5V
V
IN
:2.0V
V
IN
:2.5V
150
250
200
300
100
Output
V
oltage
V
OUT
(V)
R1210N501C
R1210N501D
5.2
5.4
5.0
4.8
4.6
4.4
Output Current I
OUT
(mA)
0
50
V
IN
:1.5V
V
IN
:2.0V
V
IN
:3.0V
V
IN
:4.0V
150
250
200
300
100
Output
V
oltage
V
OUT
(V)
5.2
5.4
5.0
4.8
4.6
4.4
Output Current I
OUT
(mA)
0
50
V
IN
:1.5V
V
IN
:2.0V
V
IN
:3.0V
V
IN
:4.0V
150
250
200
300
100
Output
V
oltage
V
OUT
(V)
2)
Efficiency vs. Output Current
R1210N301C
R1210N301D
80
100
60
40
20
0
Output Current I
OUT
(mA)
0
50
V
IN
:0.9V
V
IN
:1.5V
V
IN
:2.0V
V
IN
:2.5V
150
250
200
300
100
efficiency (%)
80
100
60
40
20
0
Output Current I
OUT
(mA)
0
50
V
IN
:0.9V
V
IN
:1.5V
V
IN
:2.0V
V
IN
:2.5V
150
250
200
300
100
efficiency (%)
R1210N1
9
R1210N501C
R1210N501D
80
100
60
40
20
0
Output Current I
OUT
(mA)
0
50
V
IN
:1.5V
V
IN
:2.0V
V
IN
:3.0V
V
IN
:4.0V
150
250
200
300
100
efficiency (%)
80
100
60
40
20
0
Output Current I
OUT
(mA)
0
50
V
IN
:1.5V
V
IN
:2.0V
V
IN
:3.0V
V
IN
:4.0V
150
250
200
300
100
efficiency (%)
3)
R1210N
1A/C Efficiency
R1210N301



Output Current I
OUT
(mA)
0.01
100
90
80
70
60
50
40
30
20
10
0
0.10
1.00
10.00
100.00
efficiency (%)
R1210N301A
R1210N301C
V
IN
:1.5V
4)
Ripple Voltage vs. Output Current
R1210N301C
R1210N301D
120
140
100
80
60
40
20
0
Output Current I
OUT
(mA)
0
V
IN
:1.5(V)
V
IN
:2.0(V)
V
IN
:0.9(V)
100
150
50
Ripple
V
oltage
Vr
ipple (mV)
ESR:0.33
120
140
100
80
60
40
20
0
Output Current I
OUT
(mA)
0
V
IN
:1.5(V)
V
IN
:2.0(V)
V
IN
:0.9(V)
100
150
50
Ripple
V
oltage
Vr
ipple (mV)
ESR:0.33
R1210N1
10
R1210N501C
R1210N501D
120
140
100
80
60
40
20
0
Output Current I
OUT
(mA)
0
50
V
IN
:1.5(V)
V
IN
:2.0(V)
V
IN
:0.9(V)
150
250
200
300
100
Ripple
V
oltage
Vr
ipple (mV)
ESR:0.33
120
140
100
80
60
40
20
0
Output Current I
OUT
(mA)
0
50
V
IN
:1.5(V)
V
IN
:2.0(V)
V
IN
:0.9(V)
150
250
200
300
100
Ripple
V
oltage
Vr
ipple (mV)
ESR:0.33
5)
Start-up Voltage/Hold-on Voltage vs. Output Current (Topt=25C)
R1210N301C
R1210N301D
1.6
2.0
1.2
0.8
0.4
0.0
Output Current I
OUT
(mA)
0
5
Vhold
Vstart
15
25
20
30
10
Star
t-up/Hold-on
V
oltage
Vstar
t/Vhold (V)
1.6
2.0
1.2
0.8
0.4
0.0
Output Current I
OUT
(mA)
0
5
Vhold
Vstart
15
25
20
30
10
Star
t-up/Hold-on
V
oltage
Vstar
t/Vhold (V)
R1210N501C
R1210N501D
1.6
2.0
1.2
0.8
0.4
0.0
Output Current I
OUT
(mA)
0
5
Vhold
Vstart
15
25
20
30
10
Star
t-up/Hold-on
V
oltage
Vstar
t/Vhold (V)
1.6
2.0
1.2
0.8
0.4
0.0
Output Current I
OUT
(mA)
0
5
Vhold
Vstart
15
25
20
30
10
Star
t-up/Hold-on
V
oltage
Vstar
t/Vhold (V)
R1210N1
11
6)
Output Voltage vs. Temperature
R1210N301C
R1210N301D
3.05
3.10
3.00
2.95
2.90
Temperature Topt (
C)
-50
-25
I
OUT
:10(mA)
I
OUT
:30(mA)
I
OUT
:0(mA)
25
75
50
100
0
Output
V
oltage
V
OUT
(V)
3.05
3.10
3.00
2.95
2.90
Temperature Topt (
C)
-50
-25
I
OUT
:10(mA)
I
OUT
:30(mA)
I
OUT
:0(mA)
25
75
50
100
0
Output
V
oltage
V
OUT
(V)
R1210N501C
R1210N501D
5.05
5.15
5.10
5.00
4.95
4.85
4.90
Temperature Topt (
C)
-50
-25
I
OUT
:10(mA)
I
OUT
:30(mA)
I
OUT
:0(mA)
25
75
50
100
0
Output
V
oltage
V
OUT
(V)
5.05
5.15
5.10
5.00
4.95
4.85
4.90
Temperature Topt (
C)
-50
-25
I
OUT
:10(mA)
I
OUT
:30(mA)
I
OUT
:0(mA)
25
75
50
100
0
Output
V
oltage
V
OUT
(V)
7)
Supply Current 1 vs. Temperature
R1210N301A
R1210N301D
80
100
60
40
20
0
Temperature Topt (
C)
-50
-25
25
75
50
100
0
Supply Current I
SS1
(
A)
80
100
60
40
20
0
Temperature Topt (
C)
-50
-25
25
75
50
100
0
Supply Current I
SS1
(
A)
R1210N1
12
R1210N501C
R1210N501D
85
120
100
60
40
0
20
Temperature Topt (
C)
-50
-25
25
75
50
100
0
Supply Current I
SS1
(
A)
85
120
100
60
40
0
20
Temperature Topt (
C)
-50
-25
25
75
50
100
0
Supply Current I
SS1
(
A)
8)
Supply Current2 vs. Temperature
R1210N301A
R1210N221D
20
25
15
10
5
0
Temperature Topt (
C)
-50
-25
25
75
50
100
0
Supply Current I
SS2
(
A)
20
25
15
10
5
0
Temperature Topt (
C)
-50
-25
25
75
50
100
0
Supply Current I
SS2
(
A)
R1210N501C
R1210N601D
20
25
15
10
5
0
Temperature Topt (
C)
-50
-25
25
75
50
100
0
Supply Current I
SS2
(
A)
20
25
15
10
5
0
Temperature Topt (
C)
-50
-25
25
75
50
100
0
Supply Current I
SS2
(
A)
R1210N1
13
9)
Standby Current vs. Temperature
R1210N221A
R1210N221D
0.6
1.0
0.8
0.4
0.2
-0.2
0.0
Temperature Topt (
C)
-50
-25
25
75
50
100
0
Standb
y Current Istandb
y (
A)
0.6
1.0
0.8
0.4
0.2
-0.2
0.0
Temperature Topt (
C)
-50
-25
25
75
50
100
0
Standb
y Current Istandb
y (
A)
R1210N601C
R1210N601D
0.6
1.0
0.8
0.4
0.2
-0.2
0.0
Temperature Topt (
C)
-50
-25
25
75
50
100
0
Standb
y Current Istandb
y (
A)
0.6
1.0
0.8
0.4
0.2
-0.2
0.0
Temperature Topt (
C)
-50
-25
25
75
50
100
0
Standb
y Current Istandb
y (
A)
10) Oscillator Frequency vs. Temperature
R1210N221A
R1210N221D
200
300
250
150
100
0
50
Temperature Topt (
C)
-50
-25
25
75
50
100
0
Oscillator F
requency f
osc (kHz)
200
300
250
150
100
0
50
Temperature Topt (
C)
-50
-25
25
75
50
100
0
Oscillator F
requency f
osc (kHz)
R1210N1
14
R1210N601C
R1210N601D
200
300
250
150
100
0
50
Temperature Topt (
C)
-50
-25
25
75
50
100
0
Oscillator F
requency f
osc (kHz)
200
300
250
150
100
0
50
Temperature Topt (
C)
-50
-25
25
75
50
100
0
Oscillator F
requency f
osc (kHz)
11) Maximum Duty Cycle vs. Temperature
R1210N221A
R1210N221D
80
100
90
70
60
40
50
Temperature Topt (
C)
-50
-25
25
75
50
100
0
Maxim
um Duty Cycle (%)
80
100
90
70
60
40
50
Temperature Topt (
C)
-50
-25
25
75
50
100
0
Maxim
um Duty Cycle (%)
R1210N601C
R1210N601D
80
100
90
70
60
40
50
Temperature Topt (
C)
-50
-25
25
75
50
100
0
Maxim
um Duty (%)
80
100
90
70
60
40
50
Temperature Topt (
C)
-50
-25
25
75
50
100
0
Maxim
um Duty (%)
R1210N1
15
12) L
X
Switching Current vs. Temperature
R1210N301A
R1210N501C
400
500
300
200
100
0
Temperature Topt (
C)
-50
-25
25
75
50
100
0
L
X
Switching Current I_L
X
s
witch (mA)
400
500
300
200
100
0
Temperature Topt (
C)
-50
-25
25
75
50
100
0
L
X
Switching Current I_L
X
s
witch (mA)
R1210N221D
R1210N601D
400
500
300
200
100
0
Temperature Topt (
C)
-50
-25
25
75
50
100
0
L
X
Switching Current I_L
X
s
witch (mA)
400
500
300
200
100
0
Temperature Topt (
C)
-50
-25
25
75
50
100
0
L
X
Switching Current I_L
X
s
witch (mA)
13) L
X
leakage Current vs. Temperature
R1210N221A
R1210N221D
0.6
1.0
0.8
0.4
0.2
-0.2
0.0
Temperature Topt (
C)
-50
-25
25
75
50
100
0
L
X
Leakage Current I
LX
_leak (
A)
0.6
1.0
0.8
0.4
0.2
-0.2
0.0
Temperature Topt (
C)
-50
-25
25
75
50
100
0
L
X
Leakage Current I
LX
_leak (
A)
R1210N1
16
R1210N601C
R1210N601D
0.6
1.0
0.8
0.4
0.2
-0.2
0.0
Temperature Topt (
C)
-50
-25
25
75
50
100
0
L
X
Leakage Current I
LX
_leak (
A)
0.6
1.0
0.8
0.4
0.2
-0.2
0.0
Temperature Topt (
C)
-50
-25
25
75
50
100
0
L
X
Leakage Current I
LX
_leak (
A)
14) V
LX
Voltage Limit vs. Temperature
R1210N301A
R1210N221D
0.8
1.0
0.6
0.4
0.2
0.0
Temperature Topt (
C)
-50
-25
25
75
50
100
0
L
X
V
oltage
Limit V
LXlim
(V)
0.8
1.0
0.6
0.4
0.2
0.0
Temperature Topt (
C)
-50
-25
25
75
50
100
0
L
X
V
oltage
Limit V
LXlim
(V)
R1210N501C
R1210N601D
0.8
1.0
0.6
0.4
0.2
0.0
Temperature Topt (
C)
-50
-25
25
75
50
100
0
L
X
V
oltage
Limit V
LXlim
(V)
0.8
1.0
0.6
0.4
0.2
0.0
Temperature Topt (
C)
-50
-25
25
75
50
100
0
L
X
V
oltage
Limit V
LXlim
(V)
R1210N1
17
15) CE "H" Input Voltage vs. Temperature
R1210N221A
R1210N601C
0.7
0.9
0.8
0.6
0.5
0.3
0.4
Temperature Topt (
C)
-50
-25
25
75
50
100
0
CE"H" Input
V
oltage
V_CE"H" (V)
0.7
0.9
0.8
0.6
0.5
0.3
0.4
Temperature Topt (
C)
-50
-25
25
75
50
100
0
CE"H" Input
V
oltage
V_CE"H" (V)
16) CE "L" Input Voltage vs. Temperature
R1210N221A
R1210N601C
0.7
0.9
0.8
0.6
0.5
0.3
0.4
Temperature Topt (
C)
-50
-25
25
75
50
100
0
CE"L" Input
V
oltage
V_CE"L" (V)
0.7
0.9
0.8
0.6
0.5
0.3
0.4
Temperature Topt (
C)
-50
-25
25
75
50
100
0
CE"L" Input
V
oltage
V_CE"L" (V)