2000. 3.13

LOW NOISE 150mA LDO REGULATOR

R1122N SERIES

Rev. 1.10

- 1 -

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.

l Ultra-Low Supply Current.................................................TYP. 100mA

l Standby Mode ...................................................................TYP. 0.1mA

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.

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.