'2000.3.13
LOW NOISE 150mA LDO REGULATOR
R1112N SERIES
n OUTLINE
The R1112N 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 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 R1112N 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 ICsis SOT-23-5 (Mini-mold) package,
high density mounting of the ICs on boards is possible.
n FEATURES
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Ultra-Low Supply Current.............................................. Typ. 100mA
Standby Mode................................................................... Typ. 0.1mA
Low Dropout Voltage ...................................................... Typ. 0.19V(IOUT=100mA 3.0V 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 Output Voltage Accuracy...................................... ±2.0%
Excellent Dynamic Response
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
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Built-in chip enable circuit ( 2 types; A: active low , B: active high)
Pin-out................................................................................Similar to the LP2980/LP2985
Built-in fold-back protection circuit..............................Typ. 30mA (Current at short mode)
Ceramic capacitors recommended to be used with this IC
n APPLICATIONS
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Power source for cellular phones such as GSM, CDMA and various kinds of PCSs.
Power source for electrical appliances such as cameras, VCRs and camcorders.
Power source for battery-powered equipment.
Rev. 1.10
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