R1126N SERIES
LOW NOISE 150mA LDO REGULATOR
NO. EA-130-0512
OUTLINE
The R1126N Series are CMOS-based voltage regulator ICs with high output voltage accuracy, 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 short current limit circuit, a chip enable circuit, and so on.
These ICs perform with low dropout voltage and the chip-enable function. The supply current at no load of this
IC is only 10µA, and the line transient response and the load transient response of the R1126N Series are
excellent, thus these ICs are very suitable for the power supply for hand-held communication equipment.
The supply current at no load of R1126x Series is remarkably reduced compared with R1114x Series. The
mode change signal to reduce the supply current is not necessary. The output voltage accuracy is also improved.
(±1.5%)
The output voltage of these ICs is fixed with high accuracy. Since the package for these ICs is SOT-23-5
therefore high density mounting of the ICs on boards is possible.
R1116N Series that a pin configuration differs from R1126N Series are available.
FEATURES
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Low Supply Current ............................................................. Typ. 10µA
Standby Current ................................................................... Typ. 0.1µA
Input Voltage Range ............................................................ 1.8V to 6.0V
Output Voltage Range.......................................................... 1.5V to 4.0V
Low Dropout Voltage............................................................ Typ. 0.29V (I
OUT
=150mA,V
OUT
=2.8V)
High Ripple Rejection .......................................................... Typ. 70dB (f=1kHz, V
OUT
=3.0V)
Typ. 53dB (f=10kHz)
High Output Voltage Accuracy .............................................
±1.5%
(1.5V
<
V
OUT
<
3.0V),
±2.0%
(V
OUT
>3.0V)
=
=
Low Temperature-Drift Coefficient of Output Voltage........... Typ.
±100ppm/°C
Excellent Line Regulation .................................................... Typ. 0.02%/V
Small Packages ................................................................. SOT-23-5
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
=1.0µF
(Ceramic)
APPLICATIONS
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Power source for portable communication equipment.
Power source for portable music player.
Power source for electrical appliances such as cameras, VCRs and camcorders.
Power source for battery-powered equipment.
1
R1126N
BLOCK DIAGRAMS
R1126Nxx1B
V
DD
V
OUT
V
DD
R1126Nxx1D
V
OUT
Vref
Current Limit
Vref
Current Limit
CE
GND
CE
GND
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;
R1126Nxx1x-xx
↑ ↑
a b
Code
a
b
↑ ↑
c d
←Part
Number
Contents
Designation of Package Type:
N: SOT-23-5
Setting Output Voltage (V
OUT
):
Stepwise setting with a step of 0.1V in the range of 1.5V to 4.0V is possible.
Exceptions:2.85V=R1126N281x5, 1.85V=R1126N181x5
Designation of Active 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.)
c
d
2
Talking
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