'99.7.22
LOW NOISE 150mA LDO REGULATOR
R1111N SERIES
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OUTLINE
The R1111N 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 R1111N 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 Output Voltage Accuracy..................................±2.0%
Excellent Line Transient Response and Load Transient 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
Built-in chip enable circuit ( 2 types; A: “L” active , B: “H” active)
Pinout ........................................................................Similar to the LP2980
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APPLICATIONS
Power source for cellular phones such as GSM,CDMA and various kind of PCSs.
Power source for electrical appliances such as cameras, VCRs and camcorders.
Power source for battery-powered equipment.
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BLOCK DIAGRAM
R1111NXX1A
R1111NXX1B
1
V
DD
5
V
OUT
1
V
DD
5
V
OUT
Vref
CE
3
Current Limit
GND
2
CE
3
Vref
Current Limit
GND
2
Rev.1.11
-1-
RICOH [ RICOH ELECTRONICS DEVICES DIVISION ]
