’99.7.13
LOW NOISE 150mA LDO REGULATOR
R1121N SERIES
s
OUTLINE
The R1121N 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 R1121N 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
Ultra-Low Supply Current.................................................TYP. 35µA
Standby Mode ...................................................................TYP. 0.1µA
Low Dropout Voltage ........................................................TYP. 0.2V (I
OUT
= 100mA)
High Ripple Rejection .......................................................TYP. 70db (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”)
Pinout ................................................................................Similar to the TK112, TK111
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APPLICATIONS
Power source for cellular phones such as GSM, CDMA and various kind of PCSs.
Power source for domestic appliances such as cameras, VCRs and camcorders.
Power source for battery-powered equipment.
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BLOCK DIAGRAM
R1121NXX1A
R1121NXX1B
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
Rev.1.11
-1-
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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 :
R1121XXX1X-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.)
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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.1.11
-2-
s
ABSOLUTE MAXIMUM RATINGS
Symbol
V
IN
V
CE
V
OUT
P
D
Topt
Tstg
Item
Input Voltage
Input Voltage (CE or CE Pin)
Output Voltage
Power Dissipation
Operating Temperature
Range
Storage Temperature Range
Rating
9
-0.3 ~ V
IN
+0.3
-0.3~ V
IN
+0.3
250
-40 ~ 85
-55 ~ 125
Unit
V
V
V
mW
°C
°C
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ELECTRICAL CHARACTERISTICS
q
R1121NXX1A
Symbol
V
OUT
I
OUT
∆V
OUT
/∆I
OUT
V
DIF
I
SS
Istandby
∆V
OUT
/∆V
IN
RR
V
IN
∆V
OUT
/∆T
Ilim
R
PU
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-up Resistance
CE Input Voltage “H”
CE Input Voltage “L”
Output Noise
Topt = 25°C
Conditions
MIN.
TYP.
MAX.
Unit
V
IN
= Set V
OUT
+1V
V
OUT
V
OUT
V
1mA
≤
I
OUT
≤
30mA
×0.98
×1.02
refer to the ELECTRICAL CHARACTERISTICS by OUTPUT
VOLTAGE
V
IN
= Set V
OUT
+1V
12
40
mV
1mA
≤
I
OUT
≤
80mA
refer to the ELECTRICAL CHARACTERISTICS by OUTPUT
VOLTAGE
V
IN
= Set V
OUT
+1V
35
70
µA
V
IN
= V
CE
= Set V
OUT
+1V
0.1
1.0
µA
Set V
OUT
+0.5V
≤
V
IN
≤
8V
0.05
0.20
%/V
I
OUT
= 30mA
f = 1KHz, Ripple 0.5Vp-p
70
dB
V
IN
= Set V
OUT
+1V
8
V
ppm
I
OUT
= 30mA
±100
/°C
-40°C
≤
Topt
≤
85°C
V
OUT
= 0V
50
mA
2.5
5
10
MΩ
1.5
V
IN
V
0
0.25
V
BW = 10Hz ~ 100kHz
30
µVrms
Rev.1.11
-3-
s
OPERATION
R1121NXX1A
R1121NXX1B
3
V
DD
1
V
OUT
3
V
DD
1
V
OUT
R1
Vref
CE
4
Current Limit
R2
GND
CE
4
Vref
Current Limit
R1
R2
GND
2
2
In these ICs, fluctuation of Output Voltage, V
OUT
is detected by Feed-back Registers, R1 and R2, and the result is compared
with a reference voltage by Error Amplifier, so that a constant voltage is output.
A current limit circuit for protection at short mode and a chip enable circuit are included.
Rev.1.11
-5-
DIY/Open Source Hardware
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