R1210Nxx2x SERIES
PWM Step-up DC/DC Controller
NO.EA-064-111123
OUTLINE
The R1210Nxx2C/xx2D Series are CMOS-based PWM step-up DC/DC Converter controllers, with high
accuracy, low supply current.
Each of the R1210Nxx2x 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, a controller against
drastic load transient and an output voltage detector. A low ripple, high efficiency step-up DC/DC converter can
be composed of this IC with only four external components, or an inductor, a diode, a transistor and a capacitor.
The R1210Nxx2x Series can detect drastic change of output voltage with a circuit controller, the load transient
response is improved.
Each of the R1210Nxx2x Series has a driver pin, or ‘EXT’ pin for external transistor. By connecting a power
transistor with low ON-resistance to EXT pin, a large current flows through an inductor, thus, large output current
can be supplied.
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, a capacitor, and a transistor
Standby Current ................................................Max. 0.5μA
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
Two choices of Basic Oscillator Frequency ......100kHz (xx2C), 180kHz (xx2D)
Output Voltage Accuracy...................................±2.5%
Small Package ..................................................SOT-23-5
Low Ripple, Low Noise
Oscillator Start-up Voltage ................................Max. 0.8V
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.
1
R1210Nxx2x
BLOCK DIAGRAMS
Vref Circuit
EXT
5
Buffer
PWM Controller
OSC
Phase Comp.
-
+
-
+
-
+
2
V
OUT
Chip Enable
4
GND
1
CE
SELECTION GUIDE
In the R1210N Series, the output voltage, the oscillator frequency for the ICs can be selected at the user’s
request.
The selection can be made by designating the part number as shown below;
Product Name
R1210Nxx2∗-TR-FE
Package
SOT-23-5
Quantity per Reel
3,000 pcs
Pb Free
Yes
Halogen Free
Yes
xx : Setting Output Voltage(V
OUT
)
Stepwise setting with a step of 0.1V in the range of 2.2V（22）to 6.0V（60）
∗
: Designation of Oscillator Frequency
C：100kHz
D：180kHz
2
R1210Nxx2x
PIN CONFIGURATION
SOT-23-5
5
4
(mark side)
1
2
3
PIN DESCRIPTIONS
Pin No
1
2
3
4
5
Symbol
CE
V
OUT
NC
GND
EXT
Chip Enable Pin
Pin for Output Voltage
No Connection
Ground Pin
External Transistor Drive Pin
Pin Description
ABSOLUTE MAXIMUM RATINGS
Symbol
V
OUT
V
EXT
V
CE
I
EXT
P
D
Topt
Tstg
Item
V
OUT
Pin Output Voltage
EXT Pin Output Voltage
CE Pin Input Voltage
EXT Pin Output Current
Power Dissipation
Operating Temperature Range
Storage Temperature Range
Rating
-0.3 to 9.0
-0.3 to V
OUT
+0.3
-0.3 to 9.0
±40
420
−40
to
+85
−55
to
+125
Unit
V
V
V
mA
mW
°C
°C
*1) For Power Dissipation, please refer to PACKAGE INFORMATION.
ABSOLUTE MAXIMUM RATINGS
Electronic and mechanical stress momentarily exceeded absolute maximum ratings may cause the
permanent damages and may degrade the life time and safety for both device and system using the device
in the field.
The functional operation at or over these absolute maximum ratings is not assured.
3
R1210Nxx2x
ELECTRICAL CHARACTERISTICS
•
R1210Nxx2x
Topt=25°C
Symbol
V
OUT
V
IN
ΔV
OUT
/
ΔT
Vstart
Istandby
Item
Output Voltage
Maximum Input Voltage
Step-up Output Voltage
Temperature Coefficient
Start-up Voltage
−40°C
<
=
Conditions
V
IN
=V
SET
×0.6,
I
OUT
=1mA
Min.
×0.975
Typ.
Max.
×1.025
8
Unit
V
V
ppm/°C
Topt
<
=
85°C
±100
0.8
0.5
18
23
20
25
25
30
30
35
35
40
45
50
50
55
10
35
45
40
50
50
60
60
70
70
80
90
100
100
110
15
22
V
IN
=0V→2V
V
μA
μA
(xx2C)
Supply Current 3(Standby) V
OUT
=6.5V,V
CE
=0V
V
OUT
= V
SET
×0.96
EXT at no load
2.2V
<
V
SET
<
2.4V
=
=
μA
(xx2D)
V
OUT
= V
SET
×0.96
EXT at no load
2.5V
<
V
SET
<
3.0V
=
=
μA
(xx2C)
μA
(xx2D)
V
OUT
= V
SET
×0.96
EXT at no load
3.1V
<
V
SET
<
3.9V
=
=
μA
(xx2C)
μA
(xx2D)
I
DD1
Supply Current 1
V
OUT
= V
SET
×0.96
EXT at no load
4.0V
<
V
SET
<
4.4V
=
=
μA
(xx2C)
μA
(xx2D)
V
OUT
= V
SET
×0.96
EXT at no load
4.5V
<
V
SET
<
4.9V
=
=
μA
(xx2C)
μA
(xx2D)
V
OUT
= V
SET
×0.96
EXT at no load
5.0V
<
V
SET
<
5.4V
=
=
μA
(xx2C)
μA
(xx2D)
V
OUT
= V
SET
×0.96
EXT at no load
5.5V
<
V
SET
<
6.0V
=
=
μA
(xx2C)
μA
(xx2D)
μA
(xx2C)
I
DD2
Supply Current 2
V
OUT
=V
CE
=V
SET
+0.5
15
μA
(xx2D)
4
R1210Nxx2x
Symbol
Item
Conditions
2.2V
<
V
SET
<
2.5V
=
=
V
EXT
=V
OUT
-0.4V
2.6V
<
V
SET
<
3.0V
=
=
V
EXT
=V
OUT
-0.4V
3.1V
<
V
SET
<
3.5V
=
=
V
EXT
=V
OUT
-0.4V
3.6V
<
V
SET
<
4.0V
=
=
V
EXT
=V
OUT
-0.4V
4.1V
<
V
SET
<
4.5V
=
=
V
EXT
=V
OUT
-0.4V
4.6V
<
V
SET
<
5.0V
=
=
V
EXT
=V
OUT
-0.4V
5.1V
<
V
SET
<
5.5V
=
=
V
EXT
=V
OUT
-0.4V
5.6V
<
V
SET
<
6.0V
=
=
V
EXT
=V
OUT
-0.4V
V
OUT
=V
CE
=V
SET
×0.96
80
144
100
180
0.5
−40°C
<
=
Min.
Typ.
Max.
-1.0
-2.0
-2.5
-3.0
-3.5
-4.0
-4.5
-5.0
120
216
Unit
mA
mA
mA
mA
mA
mA
mA
mA
kHz
(xx2C)
I
EXTH
EXT “H” Output Current
fosc
Maximum Oscillator
Frequency
kHz
(xx2D)
Δ
fosc/
ΔT
Maxdty
kHz/°C
(xx2C)
Oscillator Frequency
Temperature Coefficient
Oscillator Maximum
Duty Cycle
Topt
<
=
85°C
0.6
kHz/°C
(xx2D)
V
OUT
=V
CE
=V
SET
×0.96,
(V
EXT
“H” Side)
2.2V
2.6V
3.1V
<
=
<
=
<
=
<
=
<
=
<
=
<
=
<
=
70
1.0
2.0
2.5
3.0
3.5
4.0
4.5
5.0
0.9
85
97
%
mA
mA
mA
mA
mA
mA
mA
mA
V
V
SET
V
SET
V
SET
V
SET
V
SET
V
SET
V
SET
V
SET
<
=
<
=
<
=
<
=
<
=
<
=
<
=
<
=
2.5V,V
EXT
=0.4V
3.0V,V
EXT
=0.4V
3.5V,V
EXT
=0.4V
4.0V,V
EXT
=0.4V
4.5V,V
EXT
=0.4V
5.0V,V
EXT
=0.4V
5.5V,V
EXT
=0.4V
6.0V,V
EXT
=0.4V
I
EXTL
EXT “L” Output Current
3.6V
4.1V
4.6V
5.1V
5.6V
V
CEH
V
CEL
I
CEH
I
CEL
CE “H” Input Voltage
CE “L” Input Voltage
CE “H” Input Current
CE “L” Input Current
V
OUT
=V
SET
×0.96
V
OUT
=V
SET
×0.96
V
OUT
=V
CE
=6.5V
V
IN
=6.5V, V
CE
=0V
0.3
-0.1
-0.1
0.0
0.0
0.1
0.1
V
μA
μA
*Note: V
SET
means setting Output Voltage.
5
stm32/stm8
