R1124N SERIES
LOW NOISE 150mA LDO REGULATOR
NO.EA-095-0512
OUTLINE
The R1124N Series are CMOS-based voltage regulator ICs with high output voltage accuracy, extremely low
supply current, low ON-resistance, and high ripple rejection. Each of these ICs consists of a voltage reference
unit, an error amplifier, resistor-net for voltage setting, 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 R1124N 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 is SOT-23-5, high
density mounting of the ICs on boards is possible.
FEATURES
•
•
•
•
•
•
•
•
•
•
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Low Supply Current ............................................................. Typ. 75µA
Standby Mode ...................................................................... Typ. 0.1µA
Low Dropout Voltage............................................................ Typ. 0.22V (I
OUT
=150mA 3.0V Output type)
High Ripple Rejection .......................................................... Typ. 70dB (f=1kHz 3.0V Output type)
............................................................................................. Typ. 60dB (f=10kHz)
Low Temperature-Drift Coefficient of Output Voltage........... Typ.
±100ppm/°C
Excellent Line Regulation .................................................... Typ. 0.02%/V
High Output Voltage Accuracy .............................................
±2.0%
Small Packages ................................................................. SOT-23-5
Output Voltage ..................................................................... Stepwise setting with a step of 0.1V in
the range of 1.5V to 4.0V is possible
Built-in Fold Back Protection Circuit .................................... Typ. 40mA (Current at short mode)
Ceramic capacitors are recommended to be used with this IC ... C
IN
=C
OUT
=1µF
(V
OUT
<2.5V)
C
IN
=1µF,
C
OUT
=0.47µF
(V
OUT
>
2.5V)
=
APPLICATIONS
•
Power source for portable communication equipment.
•
Power source for electrical appliances such as cameras, VCRs and camcorders.
•
Power source for battery-powered equipment.
1
R1124N
BLOCK DIAGRAMS
R1124Nxx1A
V
DD
V
OUT
R1124Nxx1B
V
DD
-
+
V
OUT
Vref
Current Limit
CE
GND
Vref
Current Limit
CE
GND
R1124Nxx1D
V
DD
-
+
Vref
Current Limit
CE
GND
V
OUT
SELECTION GUIDE
The output voltage, version, and the taping type for the ICs can be selected at the user’s request.
The selection can be made with designating the part number as shown below;
R1124Nxx1x-xx
↑
a
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 4.0V is possible
Designation of Active Type:
A: active low type
B: active high type
D: active high, with auto discharge
Designation of Taping Type:
Ex. TR (refer to Taping Specifications; TR type is the standard direction.)
b
c
2
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