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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