2000. 3.13
LOW NOISE 150mA LDO REGULATOR
R1122N SERIES
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OUTLINE
The R1122N Series are voltage regulator ICs with high output voltage accuracy, extremely low supply current, low ON-
resistance and high ripple rejection by CMOS process. Each of these voltage regulator ICs consists of a voltage reference unit,
an error amplifier, resistors, a current limit circuit, and a chip enable circuit. These ICs perform with low dropout voltage and
a chip enable function.
The line transient response and load transient response of the R1122N Series are excellent, thus these ICs are very suitable for
the power supply for hand-held communication equipment. The output voltage of these ICs is fixed with high accuracy.
Since the package for these ICs are SOT-23-5 (Mini-mold) package, high density mounting of the ICs on boards is possible.
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FEATURES
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Ultra-Low Supply Current.................................................TYP. 100mA
Standby Mode ...................................................................TYP. 0.1mA
Low Dropout Voltage ........................................................TYP. 0.19V (I
OUT
= 100mA, 3V Output type)
High Ripple Rejection .......................................................TYP. 80dB (f = 1kHz)
Low Temperature-Drift Coefficient of Output Voltage .....TYP.
±100ppm/°C
Excellent Line Regulation .................................................TYP. 0.05%/V
High Accuracy Output Voltage..........................................±2.0%
Small Package ..................................................................SOT-23-5 (Mini-mold)
Output Voltage ..................................................................Stepwise setting with a step of 0.1V in the range of 1.5V to 5.0V
is possible.
Built-in chip enable circuit (2 Types; A: active “L”, B: active “H”)
Built-in Fold-back protection circuit .................................Short Current Typ. 30mA
Pinout ................................................................................Similar to the TK112, TK111
Ceramic Capacitors are Recommendable to be used with this IC.
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APPLICATIONS
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Power source for cellular phones such as GSM, CDMA, PCS and so forth.
Power source for domestic appliances such as cameras, VCRs and camcorders.
Power source for battery-powered equipment.
Rev. 1.10
-1-
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BLOCK DIAGRAM
R1122NXX1A
R1122NXX1B
3
V
DD
1
V
OUT
3
V
DD
1
V
OUT
Vref
CE
4
Current Limit
GND
2
CE
4
Vref
Current Limit
GND
2
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SELECTION GUIDE
The output voltage, the active type, the packing type, 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 :
R1122NXX1X-XX
- - -
a b c
Code
a
b
c
¬Part
Number
Contents
Setting Output Voltage (V
OUT
) :
Stepwise setting with a step of 0.1V in the range of 1.5V to 5.0V is possible.
Designation of Active Type :
A : active “L” type
B : active “H” type
Designation of Taping Type :
Ex. TR, TL (refer to Taping Specifications; TR type is the standard direction.)
Rev. 1.10
-2-
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PIN CONFIGURATION
SOT-23-5
5
4
NC
(mark side)
V
OUT
GND
CE
V
DD
1
2
3
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PIN DESCRIPTION
Pin No.
1
2
3
4
5
Symbol
V
OUT
GND
V
DD
CE or CE
NC
Description
Output pin
Ground Pin
Input Pin
Chip Enable Pin
No Connection
Rev. 1.10
-3-
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ABSOLUTE MAXIMUM RATINGS
Symbol
V
IN
V
CE
V
OUT
I
OUT
P
D
Topt
Tstg
Item
Input Voltage
Input Voltage (CE or CE Pin)
Output Voltage
Output Current
Power Dissipation
Operating Temperature
Range
Storage Temperature Range
Rating
7.0
-0.3 ~ V
IN
+0.3
-0.3~ V
IN
+0.3
200
250
-40 ~ 85
-55 ~ 125
Unit
V
V
V
mA
mW
°C
°C
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ELECTRICAL CHARACTERISTICS
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R1122NXX1A
Symbol
V
OUT
I
OUT
DV
OUT
/DI
OUT
V
DIF
I
SS
Istandby
DV
OUT
/DV
IN
RR
V
IN
DV
OUT
/DT
Ilim
R
PU
V
CEH
V
CEL
en
Item
Conditions
MIN.
TYP.
V
IN
= Set V
OUT
+1V
V
OUT
1mA
£
I
OUT
£
30mA
´0.98
V
IN
= Set V
OUT
+1V
150
mA
When V
OUT
= Set V
OUT
-0.1V
V
IN
= Set V
OUT
+1V
12
40
mV
1mA
£
I
OUT
£
80mA
refer to the ELECTICAL CHARACTERISTICS by OUTPUT
VOLTAGE
V
IN
= Set V
OUT
+1V
100
170
mA
V
IN
= V
CE
= Set V
OUT
+1V
0.1
1.0
mA
Set V
OUT
+0.5V
£
V
IN
£
8V
0.05
0.20
%/V
I
OUT
= 30mA
f = 1KHz, Ripple 0.5Vp-p
80
dB
V
IN
= Set V
OUT
+1V
2.0
6.0
V
ppm
I
OUT
= 30mA
±100
-40°C
£
Topt
£
85°C
/°C
V
OUT
= 0V
30
mA
2.5
5
10
MW
1.5
V
IN
V
0
0.25
V
BW = 10Hz ~ 100kHz
30
mVrms
Topt = 25°C
MAX.
Unit
V
OUT
V
´1.02
Output Voltage
Output Current
Load Regulation
Dropout Voltage
Supply Current
Supply Current (Standby)
Line Regulation
Ripple Rejection
Input Voltage
Output Voltage
Temperature Coefficient
Short Current Limit
CE Pull-up Resistance
CE Input Voltage “H”
CE Input Voltage “L”
Output Noise
Rev. 1.10
-4-
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R1122NXX1B
Symbol
V
OUT
I
OUT
DV
OUT
/DI
OUT
V
DIF
I
SS
Istandby
DV
OUT
/DV
IN
RR
V
IN
DV
OUT
/DT
Ilim
R
PD
V
CEH
V
CEL
en
Item
Output Voltage
Output Current
Load Regulation
Dropout Voltage
Supply Current
Supply Current (Standby)
Line Regulation
Ripple Rejection
Input Voltage
Output Voltage
Temperature Coefficient
Short Current Limit
CE Pull-down Resistance
CE Input Voltage “H”
CE Input Voltage “L”
Output Noise
Conditions
MIN.
TYP.
V
IN
= Set V
OUT
+1V
V
OUT
1mA
£
I
OUT
£
30mA
´0.98
V
IN
= Set V
OUT
+1V
150
mA
When V
OUT
= Set V
OUT
-0.1V
V
IN
= Set V
OUT
+1V
12
40
mV
1mA
£
I
OUT
£
80mA
refer to the ELECTICAL CHARACTERISTICS by OUTPUT
VOLTAGE
V
IN
= Set V
OUT
+1V
100
170
mA
V
IN
= Set V
OUT
+1V
0.1
1.0
mA
V
CE
= GND
Set V
OUT
+0.5V
£
V
IN
£
8V
0.05
0.20
%/V
I
OUT
= 30mA
f = 1KHz, Ripple 0.5Vp-p
80
dB
V
IN
= Set V
OUT
+1V
2.0
6.0
V
ppm
I
OUT
= 30mA
±100
/°C
-40°C
£
Topt
£
85°C
V
OUT
= 0V
30
mA
2.5
5
10
MW
1.5
V
IN
V
0
0.25
V
BW = 10Hz ~ 100kHz
30
mVrms
Topt=25°C
MAX.
Unit
V
OUT
V
´1.02
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ELECTRICAL CHARACTERISTICS by OUTPUT VOLTAGE
Output Voltage
V
OUT
(V)
1.5
£
V
OUT
£
1.6
1.7
£
V
OUT
£
1.8
1.9
£
V
OUT
£
2.3
2.4
£
V
OUT
£
2.7
2.8
£
V
OUT
£
5.0
Topt = 25°C
Dropout Voltage
V
DIF
(V)
Conditions
TYP.
MAX.
0.32
0.55
0.28
0.47
I
OUT
= 100mA
0.25
0.35
0.20
0.29
0.19
0.26
Rev. 1.10
-5-
