R1210Nxx1x SERIES
PWM STEP-UP DC/DC CONVERTER
NO.EA-075-170303
OUTLINE
The R1210Nxx1x Series are CMOS-based PWM step-up DC/DC Converter, with high accuracy, low supply
current.
Each of the R1210Nxx1x 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. R1210Nxx1A 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 components, 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
response is improved compared with current model, furthermore the R1210Nxx1A 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 ............................................... Max. 0.5A
Temperature-Drift Coefficient of Output Voltage Typ.100ppm/C
Output Voltage Range ....................................... 2.2V to 3.5V (xx1A), 2.2V to 6.0V (xx1C/D), 0.1V steps
Two choices of Basic Oscillator Frequency ..... 100kHz (xx1A/C), 180kHz (xx1D)
Output Voltage Accuracy ..................................
2.5%
Package ........................................................... SOT-23-5
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 xx1A type) from Typ. 100kHz to 35kHz
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
R1210Nxx1x
PIN CONFIGURATIONS
SOT-23-5
5
4
(mark side)
1
2
3
PIN DESCRIPTIONS
SOT-23-5
Pin No
1
2
3
4
5
Symbol
CE
V
OUT
NC
GND
L
X
Pin Description
Chip Enable Pin ("H" Active)
Pin for Monitoring Output Voltage
No Connection
Ground Pin
Switching Pin (Nch Open Drain)
ABSOLUTE MAXIMUM RATINGS
Symbol
V
OUT
V
LX
V
CE
I
LX
P
D
T
opt
T
stg
V
OUT
Pin Output Voltage
L
X
Pin Output Voltage
CE Pin Input Voltage
L
X
Pin Output Current
Power Dissipation
(SOT-23-5)
Operating Temperature Range
Storage Temperature Range
Item
Rating
0.3
to 9.0
0.3
to 9.0
0.3
to 9.0
400
420
40
to 85
55
to 125
Unit
V
V
V
mA
mW
C
C
)
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
R1210Nxx1x
Symbol
Item
Conditions
2.2V≤V
SET
≤2.5V
2.6V≤V
SET
≤3.0V
3.1V≤V
SET
≤3.5V
I
DD1
Supply Current 1
(xx1D)
Min.
Typ.
50
60
70
80
90
100
110
120
Max.
80
90
100
110
120
130
150
170
Unit
V
OUT
=V
SET
0.96
3.6V≤V
SET
≤4.0V
4.1V≤V
SET
≤4.5V
4.6V≤V
SET
≤5.0V
5.1V≤V
SET
≤5.5V
5.6V≤V
SET
≤6.0V
2.2V≤V
SET
≤2.4V
2.5V≤V
SET
≤2.9V
3.0V≤V
SET
≤3.4V
3.5V≤V
SET
≤3.9V
4.0V≤V
SET
≤4.4V
4.5V≤V
SET
≤4.9V
5.0V≤V
SET
≤5.4V
5.5V≤V
SET
≤6.0V
70
85
100
120
140
150
170
190
A
I
LX
L
X
Switching Current
V
LX
=0.4V
mA
*Note: V
SET
means setting Output Voltage.
RECOMMENDED OPERATING CONDITIONS (ELECTRICAL CHARACTERISTICS)
All of electronic equipment should be designed that the mounted semiconductor devices operate within the
recommended operating conditions. The semiconductor devices cannot operate normally over the
recommended operating conditions, even if when they are used over such conditions by momentary
electronic noise or surge. And the semiconductor devices may receive serious damage when they continue
to operate over the recommended operating conditions.
5
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