R1122N Datasheet, PDF (1/22 Pages) RICOH electronics devices division – LOW NOISE 150mA LDO REGULATOR

2000. 3.13
LOW NOISE 150mA LDO REGULATOR
R1122N SERIES
n 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.
n FEATURES
l Ultra-Low Supply Current.................................................TYP. 100mA
l Standby Mode ...................................................................TYP. 0.1mA
l Low Dropout Voltage ........................................................TYP. 0.19V (IOUT = 100mA, 3V Output type)
l High Ripple Rejection .......................................................TYP. 80dB (f = 1kHz)
l Low Temperature-Drift Coefficient of Output Voltage .....TYP. ±100ppm/°C
l Excellent Line Regulation .................................................TYP. 0.05%/V
l High Accuracy Output Voltage..........................................±2.0%
l Small Package ..................................................................SOT-23-5 (Mini-mold)
l Output Voltage ..................................................................Stepwise setting with a step of 0.1V in the range of 1.5V to 5.0V
is possible.
l Built-in chip enable circuit (2 Types; A: active “L”, B: active “H”)
l Built-in Fold-back protection circuit .................................Short Current Typ. 30mA
l Pinout ................................................................................Similar to the TK112, TK111
l Ceramic Capacitors are Recommendable to be used with this IC.
n APPLICATIONS
l Power source for cellular phones such as GSM, CDMA, PCS and so forth.
l Power source for domestic appliances such as cameras, VCRs and camcorders.
l Power source for battery-powered equipment.
Rev. 1.10
-1-